Merge branch 'jk/disable-commit-graph-during-upload-pack'
[git] / packfile.c
1 #include "cache.h"
2 #include "list.h"
3 #include "pack.h"
4 #include "repository.h"
5 #include "dir.h"
6 #include "mergesort.h"
7 #include "packfile.h"
8 #include "delta.h"
9 #include "list.h"
10 #include "streaming.h"
11 #include "sha1-lookup.h"
12 #include "commit.h"
13 #include "object.h"
14 #include "tag.h"
15 #include "tree-walk.h"
16 #include "tree.h"
17 #include "object-store.h"
18 #include "midx.h"
19 #include "commit-graph.h"
20 #include "promisor-remote.h"
21
22 char *odb_pack_name(struct strbuf *buf,
23                     const unsigned char *sha1,
24                     const char *ext)
25 {
26         strbuf_reset(buf);
27         strbuf_addf(buf, "%s/pack/pack-%s.%s", get_object_directory(),
28                     sha1_to_hex(sha1), ext);
29         return buf->buf;
30 }
31
32 char *sha1_pack_name(const unsigned char *sha1)
33 {
34         static struct strbuf buf = STRBUF_INIT;
35         return odb_pack_name(&buf, sha1, "pack");
36 }
37
38 char *sha1_pack_index_name(const unsigned char *sha1)
39 {
40         static struct strbuf buf = STRBUF_INIT;
41         return odb_pack_name(&buf, sha1, "idx");
42 }
43
44 static unsigned int pack_used_ctr;
45 static unsigned int pack_mmap_calls;
46 static unsigned int peak_pack_open_windows;
47 static unsigned int pack_open_windows;
48 static unsigned int pack_open_fds;
49 static unsigned int pack_max_fds;
50 static size_t peak_pack_mapped;
51 static size_t pack_mapped;
52
53 #define SZ_FMT PRIuMAX
54 static inline uintmax_t sz_fmt(size_t s) { return s; }
55
56 void pack_report(void)
57 {
58         fprintf(stderr,
59                 "pack_report: getpagesize()            = %10" SZ_FMT "\n"
60                 "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n"
61                 "pack_report: core.packedGitLimit      = %10" SZ_FMT "\n",
62                 sz_fmt(getpagesize()),
63                 sz_fmt(packed_git_window_size),
64                 sz_fmt(packed_git_limit));
65         fprintf(stderr,
66                 "pack_report: pack_used_ctr            = %10u\n"
67                 "pack_report: pack_mmap_calls          = %10u\n"
68                 "pack_report: pack_open_windows        = %10u / %10u\n"
69                 "pack_report: pack_mapped              = "
70                         "%10" SZ_FMT " / %10" SZ_FMT "\n",
71                 pack_used_ctr,
72                 pack_mmap_calls,
73                 pack_open_windows, peak_pack_open_windows,
74                 sz_fmt(pack_mapped), sz_fmt(peak_pack_mapped));
75 }
76
77 /*
78  * Open and mmap the index file at path, perform a couple of
79  * consistency checks, then record its information to p.  Return 0 on
80  * success.
81  */
82 static int check_packed_git_idx(const char *path, struct packed_git *p)
83 {
84         void *idx_map;
85         size_t idx_size;
86         int fd = git_open(path), ret;
87         struct stat st;
88         const unsigned int hashsz = the_hash_algo->rawsz;
89
90         if (fd < 0)
91                 return -1;
92         if (fstat(fd, &st)) {
93                 close(fd);
94                 return -1;
95         }
96         idx_size = xsize_t(st.st_size);
97         if (idx_size < 4 * 256 + hashsz + hashsz) {
98                 close(fd);
99                 return error("index file %s is too small", path);
100         }
101         idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0);
102         close(fd);
103
104         ret = load_idx(path, hashsz, idx_map, idx_size, p);
105
106         if (ret)
107                 munmap(idx_map, idx_size);
108
109         return ret;
110 }
111
112 int load_idx(const char *path, const unsigned int hashsz, void *idx_map,
113              size_t idx_size, struct packed_git *p)
114 {
115         struct pack_idx_header *hdr = idx_map;
116         uint32_t version, nr, i, *index;
117
118         if (idx_size < 4 * 256 + hashsz + hashsz)
119                 return error("index file %s is too small", path);
120         if (idx_map == NULL)
121                 return error("empty data");
122
123         if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) {
124                 version = ntohl(hdr->idx_version);
125                 if (version < 2 || version > 2)
126                         return error("index file %s is version %"PRIu32
127                                      " and is not supported by this binary"
128                                      " (try upgrading GIT to a newer version)",
129                                      path, version);
130         } else
131                 version = 1;
132
133         nr = 0;
134         index = idx_map;
135         if (version > 1)
136                 index += 2;  /* skip index header */
137         for (i = 0; i < 256; i++) {
138                 uint32_t n = ntohl(index[i]);
139                 if (n < nr)
140                         return error("non-monotonic index %s", path);
141                 nr = n;
142         }
143
144         if (version == 1) {
145                 /*
146                  * Total size:
147                  *  - 256 index entries 4 bytes each
148                  *  - 24-byte entries * nr (object ID + 4-byte offset)
149                  *  - hash of the packfile
150                  *  - file checksum
151                  */
152                 if (idx_size != 4 * 256 + nr * (hashsz + 4) + hashsz + hashsz)
153                         return error("wrong index v1 file size in %s", path);
154         } else if (version == 2) {
155                 /*
156                  * Minimum size:
157                  *  - 8 bytes of header
158                  *  - 256 index entries 4 bytes each
159                  *  - object ID entry * nr
160                  *  - 4-byte crc entry * nr
161                  *  - 4-byte offset entry * nr
162                  *  - hash of the packfile
163                  *  - file checksum
164                  * And after the 4-byte offset table might be a
165                  * variable sized table containing 8-byte entries
166                  * for offsets larger than 2^31.
167                  */
168                 unsigned long min_size = 8 + 4*256 + nr*(hashsz + 4 + 4) + hashsz + hashsz;
169                 unsigned long max_size = min_size;
170                 if (nr)
171                         max_size += (nr - 1)*8;
172                 if (idx_size < min_size || idx_size > max_size)
173                         return error("wrong index v2 file size in %s", path);
174                 if (idx_size != min_size &&
175                     /*
176                      * make sure we can deal with large pack offsets.
177                      * 31-bit signed offset won't be enough, neither
178                      * 32-bit unsigned one will be.
179                      */
180                     (sizeof(off_t) <= 4))
181                         return error("pack too large for current definition of off_t in %s", path);
182         }
183
184         p->index_version = version;
185         p->index_data = idx_map;
186         p->index_size = idx_size;
187         p->num_objects = nr;
188         return 0;
189 }
190
191 int open_pack_index(struct packed_git *p)
192 {
193         char *idx_name;
194         size_t len;
195         int ret;
196
197         if (p->index_data)
198                 return 0;
199
200         if (!strip_suffix(p->pack_name, ".pack", &len))
201                 BUG("pack_name does not end in .pack");
202         idx_name = xstrfmt("%.*s.idx", (int)len, p->pack_name);
203         ret = check_packed_git_idx(idx_name, p);
204         free(idx_name);
205         return ret;
206 }
207
208 uint32_t get_pack_fanout(struct packed_git *p, uint32_t value)
209 {
210         const uint32_t *level1_ofs = p->index_data;
211
212         if (!level1_ofs) {
213                 if (open_pack_index(p))
214                         return 0;
215                 level1_ofs = p->index_data;
216         }
217
218         if (p->index_version > 1) {
219                 level1_ofs += 2;
220         }
221
222         return ntohl(level1_ofs[value]);
223 }
224
225 static struct packed_git *alloc_packed_git(int extra)
226 {
227         struct packed_git *p = xmalloc(st_add(sizeof(*p), extra));
228         memset(p, 0, sizeof(*p));
229         p->pack_fd = -1;
230         return p;
231 }
232
233 struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path)
234 {
235         const char *path = sha1_pack_name(sha1);
236         size_t alloc = st_add(strlen(path), 1);
237         struct packed_git *p = alloc_packed_git(alloc);
238
239         memcpy(p->pack_name, path, alloc); /* includes NUL */
240         hashcpy(p->hash, sha1);
241         if (check_packed_git_idx(idx_path, p)) {
242                 free(p);
243                 return NULL;
244         }
245
246         return p;
247 }
248
249 static void scan_windows(struct packed_git *p,
250         struct packed_git **lru_p,
251         struct pack_window **lru_w,
252         struct pack_window **lru_l)
253 {
254         struct pack_window *w, *w_l;
255
256         for (w_l = NULL, w = p->windows; w; w = w->next) {
257                 if (!w->inuse_cnt) {
258                         if (!*lru_w || w->last_used < (*lru_w)->last_used) {
259                                 *lru_p = p;
260                                 *lru_w = w;
261                                 *lru_l = w_l;
262                         }
263                 }
264                 w_l = w;
265         }
266 }
267
268 static int unuse_one_window(struct packed_git *current)
269 {
270         struct packed_git *p, *lru_p = NULL;
271         struct pack_window *lru_w = NULL, *lru_l = NULL;
272
273         if (current)
274                 scan_windows(current, &lru_p, &lru_w, &lru_l);
275         for (p = the_repository->objects->packed_git; p; p = p->next)
276                 scan_windows(p, &lru_p, &lru_w, &lru_l);
277         if (lru_p) {
278                 munmap(lru_w->base, lru_w->len);
279                 pack_mapped -= lru_w->len;
280                 if (lru_l)
281                         lru_l->next = lru_w->next;
282                 else
283                         lru_p->windows = lru_w->next;
284                 free(lru_w);
285                 pack_open_windows--;
286                 return 1;
287         }
288         return 0;
289 }
290
291 void close_pack_windows(struct packed_git *p)
292 {
293         while (p->windows) {
294                 struct pack_window *w = p->windows;
295
296                 if (w->inuse_cnt)
297                         die("pack '%s' still has open windows to it",
298                             p->pack_name);
299                 munmap(w->base, w->len);
300                 pack_mapped -= w->len;
301                 pack_open_windows--;
302                 p->windows = w->next;
303                 free(w);
304         }
305 }
306
307 int close_pack_fd(struct packed_git *p)
308 {
309         if (p->pack_fd < 0)
310                 return 0;
311
312         close(p->pack_fd);
313         pack_open_fds--;
314         p->pack_fd = -1;
315
316         return 1;
317 }
318
319 void close_pack_index(struct packed_git *p)
320 {
321         if (p->index_data) {
322                 munmap((void *)p->index_data, p->index_size);
323                 p->index_data = NULL;
324         }
325 }
326
327 void close_pack(struct packed_git *p)
328 {
329         close_pack_windows(p);
330         close_pack_fd(p);
331         close_pack_index(p);
332 }
333
334 void close_object_store(struct raw_object_store *o)
335 {
336         struct packed_git *p;
337
338         for (p = o->packed_git; p; p = p->next)
339                 if (p->do_not_close)
340                         BUG("want to close pack marked 'do-not-close'");
341                 else
342                         close_pack(p);
343
344         if (o->multi_pack_index) {
345                 close_midx(o->multi_pack_index);
346                 o->multi_pack_index = NULL;
347         }
348
349         close_commit_graph(o);
350 }
351
352 void unlink_pack_path(const char *pack_name, int force_delete)
353 {
354         static const char *exts[] = {".pack", ".idx", ".keep", ".bitmap", ".promisor"};
355         int i;
356         struct strbuf buf = STRBUF_INIT;
357         size_t plen;
358
359         strbuf_addstr(&buf, pack_name);
360         strip_suffix_mem(buf.buf, &buf.len, ".pack");
361         plen = buf.len;
362
363         if (!force_delete) {
364                 strbuf_addstr(&buf, ".keep");
365                 if (!access(buf.buf, F_OK)) {
366                         strbuf_release(&buf);
367                         return;
368                 }
369         }
370
371         for (i = 0; i < ARRAY_SIZE(exts); i++) {
372                 strbuf_setlen(&buf, plen);
373                 strbuf_addstr(&buf, exts[i]);
374                 unlink(buf.buf);
375         }
376
377         strbuf_release(&buf);
378 }
379
380 /*
381  * The LRU pack is the one with the oldest MRU window, preferring packs
382  * with no used windows, or the oldest mtime if it has no windows allocated.
383  */
384 static void find_lru_pack(struct packed_git *p, struct packed_git **lru_p, struct pack_window **mru_w, int *accept_windows_inuse)
385 {
386         struct pack_window *w, *this_mru_w;
387         int has_windows_inuse = 0;
388
389         /*
390          * Reject this pack if it has windows and the previously selected
391          * one does not.  If this pack does not have windows, reject
392          * it if the pack file is newer than the previously selected one.
393          */
394         if (*lru_p && !*mru_w && (p->windows || p->mtime > (*lru_p)->mtime))
395                 return;
396
397         for (w = this_mru_w = p->windows; w; w = w->next) {
398                 /*
399                  * Reject this pack if any of its windows are in use,
400                  * but the previously selected pack did not have any
401                  * inuse windows.  Otherwise, record that this pack
402                  * has windows in use.
403                  */
404                 if (w->inuse_cnt) {
405                         if (*accept_windows_inuse)
406                                 has_windows_inuse = 1;
407                         else
408                                 return;
409                 }
410
411                 if (w->last_used > this_mru_w->last_used)
412                         this_mru_w = w;
413
414                 /*
415                  * Reject this pack if it has windows that have been
416                  * used more recently than the previously selected pack.
417                  * If the previously selected pack had windows inuse and
418                  * we have not encountered a window in this pack that is
419                  * inuse, skip this check since we prefer a pack with no
420                  * inuse windows to one that has inuse windows.
421                  */
422                 if (*mru_w && *accept_windows_inuse == has_windows_inuse &&
423                     this_mru_w->last_used > (*mru_w)->last_used)
424                         return;
425         }
426
427         /*
428          * Select this pack.
429          */
430         *mru_w = this_mru_w;
431         *lru_p = p;
432         *accept_windows_inuse = has_windows_inuse;
433 }
434
435 static int close_one_pack(void)
436 {
437         struct packed_git *p, *lru_p = NULL;
438         struct pack_window *mru_w = NULL;
439         int accept_windows_inuse = 1;
440
441         for (p = the_repository->objects->packed_git; p; p = p->next) {
442                 if (p->pack_fd == -1)
443                         continue;
444                 find_lru_pack(p, &lru_p, &mru_w, &accept_windows_inuse);
445         }
446
447         if (lru_p)
448                 return close_pack_fd(lru_p);
449
450         return 0;
451 }
452
453 static unsigned int get_max_fd_limit(void)
454 {
455 #ifdef RLIMIT_NOFILE
456         {
457                 struct rlimit lim;
458
459                 if (!getrlimit(RLIMIT_NOFILE, &lim))
460                         return lim.rlim_cur;
461         }
462 #endif
463
464 #ifdef _SC_OPEN_MAX
465         {
466                 long open_max = sysconf(_SC_OPEN_MAX);
467                 if (0 < open_max)
468                         return open_max;
469                 /*
470                  * Otherwise, we got -1 for one of the two
471                  * reasons:
472                  *
473                  * (1) sysconf() did not understand _SC_OPEN_MAX
474                  *     and signaled an error with -1; or
475                  * (2) sysconf() said there is no limit.
476                  *
477                  * We _could_ clear errno before calling sysconf() to
478                  * tell these two cases apart and return a huge number
479                  * in the latter case to let the caller cap it to a
480                  * value that is not so selfish, but letting the
481                  * fallback OPEN_MAX codepath take care of these cases
482                  * is a lot simpler.
483                  */
484         }
485 #endif
486
487 #ifdef OPEN_MAX
488         return OPEN_MAX;
489 #else
490         return 1; /* see the caller ;-) */
491 #endif
492 }
493
494 const char *pack_basename(struct packed_git *p)
495 {
496         const char *ret = strrchr(p->pack_name, '/');
497         if (ret)
498                 ret = ret + 1; /* skip past slash */
499         else
500                 ret = p->pack_name; /* we only have a base */
501         return ret;
502 }
503
504 /*
505  * Do not call this directly as this leaks p->pack_fd on error return;
506  * call open_packed_git() instead.
507  */
508 static int open_packed_git_1(struct packed_git *p)
509 {
510         struct stat st;
511         struct pack_header hdr;
512         unsigned char hash[GIT_MAX_RAWSZ];
513         unsigned char *idx_hash;
514         long fd_flag;
515         ssize_t read_result;
516         const unsigned hashsz = the_hash_algo->rawsz;
517
518         if (!p->index_data) {
519                 struct multi_pack_index *m;
520                 const char *pack_name = pack_basename(p);
521
522                 for (m = the_repository->objects->multi_pack_index;
523                      m; m = m->next) {
524                         if (midx_contains_pack(m, pack_name))
525                                 break;
526                 }
527
528                 if (!m && open_pack_index(p))
529                         return error("packfile %s index unavailable", p->pack_name);
530         }
531
532         if (!pack_max_fds) {
533                 unsigned int max_fds = get_max_fd_limit();
534
535                 /* Save 3 for stdin/stdout/stderr, 22 for work */
536                 if (25 < max_fds)
537                         pack_max_fds = max_fds - 25;
538                 else
539                         pack_max_fds = 1;
540         }
541
542         while (pack_max_fds <= pack_open_fds && close_one_pack())
543                 ; /* nothing */
544
545         p->pack_fd = git_open(p->pack_name);
546         if (p->pack_fd < 0 || fstat(p->pack_fd, &st))
547                 return -1;
548         pack_open_fds++;
549
550         /* If we created the struct before we had the pack we lack size. */
551         if (!p->pack_size) {
552                 if (!S_ISREG(st.st_mode))
553                         return error("packfile %s not a regular file", p->pack_name);
554                 p->pack_size = st.st_size;
555         } else if (p->pack_size != st.st_size)
556                 return error("packfile %s size changed", p->pack_name);
557
558         /* We leave these file descriptors open with sliding mmap;
559          * there is no point keeping them open across exec(), though.
560          */
561         fd_flag = fcntl(p->pack_fd, F_GETFD, 0);
562         if (fd_flag < 0)
563                 return error("cannot determine file descriptor flags");
564         fd_flag |= FD_CLOEXEC;
565         if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1)
566                 return error("cannot set FD_CLOEXEC");
567
568         /* Verify we recognize this pack file format. */
569         read_result = read_in_full(p->pack_fd, &hdr, sizeof(hdr));
570         if (read_result < 0)
571                 return error_errno("error reading from %s", p->pack_name);
572         if (read_result != sizeof(hdr))
573                 return error("file %s is far too short to be a packfile", p->pack_name);
574         if (hdr.hdr_signature != htonl(PACK_SIGNATURE))
575                 return error("file %s is not a GIT packfile", p->pack_name);
576         if (!pack_version_ok(hdr.hdr_version))
577                 return error("packfile %s is version %"PRIu32" and not"
578                         " supported (try upgrading GIT to a newer version)",
579                         p->pack_name, ntohl(hdr.hdr_version));
580
581         /* Skip index checking if in multi-pack-index */
582         if (!p->index_data)
583                 return 0;
584
585         /* Verify the pack matches its index. */
586         if (p->num_objects != ntohl(hdr.hdr_entries))
587                 return error("packfile %s claims to have %"PRIu32" objects"
588                              " while index indicates %"PRIu32" objects",
589                              p->pack_name, ntohl(hdr.hdr_entries),
590                              p->num_objects);
591         if (lseek(p->pack_fd, p->pack_size - hashsz, SEEK_SET) == -1)
592                 return error("end of packfile %s is unavailable", p->pack_name);
593         read_result = read_in_full(p->pack_fd, hash, hashsz);
594         if (read_result < 0)
595                 return error_errno("error reading from %s", p->pack_name);
596         if (read_result != hashsz)
597                 return error("packfile %s signature is unavailable", p->pack_name);
598         idx_hash = ((unsigned char *)p->index_data) + p->index_size - hashsz * 2;
599         if (!hasheq(hash, idx_hash))
600                 return error("packfile %s does not match index", p->pack_name);
601         return 0;
602 }
603
604 static int open_packed_git(struct packed_git *p)
605 {
606         if (!open_packed_git_1(p))
607                 return 0;
608         close_pack_fd(p);
609         return -1;
610 }
611
612 static int in_window(struct pack_window *win, off_t offset)
613 {
614         /* We must promise at least one full hash after the
615          * offset is available from this window, otherwise the offset
616          * is not actually in this window and a different window (which
617          * has that one hash excess) must be used.  This is to support
618          * the object header and delta base parsing routines below.
619          */
620         off_t win_off = win->offset;
621         return win_off <= offset
622                 && (offset + the_hash_algo->rawsz) <= (win_off + win->len);
623 }
624
625 unsigned char *use_pack(struct packed_git *p,
626                 struct pack_window **w_cursor,
627                 off_t offset,
628                 unsigned long *left)
629 {
630         struct pack_window *win = *w_cursor;
631
632         /* Since packfiles end in a hash of their content and it's
633          * pointless to ask for an offset into the middle of that
634          * hash, and the in_window function above wouldn't match
635          * don't allow an offset too close to the end of the file.
636          */
637         if (!p->pack_size && p->pack_fd == -1 && open_packed_git(p))
638                 die("packfile %s cannot be accessed", p->pack_name);
639         if (offset > (p->pack_size - the_hash_algo->rawsz))
640                 die("offset beyond end of packfile (truncated pack?)");
641         if (offset < 0)
642                 die(_("offset before end of packfile (broken .idx?)"));
643
644         if (!win || !in_window(win, offset)) {
645                 if (win)
646                         win->inuse_cnt--;
647                 for (win = p->windows; win; win = win->next) {
648                         if (in_window(win, offset))
649                                 break;
650                 }
651                 if (!win) {
652                         size_t window_align = packed_git_window_size / 2;
653                         off_t len;
654
655                         if (p->pack_fd == -1 && open_packed_git(p))
656                                 die("packfile %s cannot be accessed", p->pack_name);
657
658                         win = xcalloc(1, sizeof(*win));
659                         win->offset = (offset / window_align) * window_align;
660                         len = p->pack_size - win->offset;
661                         if (len > packed_git_window_size)
662                                 len = packed_git_window_size;
663                         win->len = (size_t)len;
664                         pack_mapped += win->len;
665                         while (packed_git_limit < pack_mapped
666                                 && unuse_one_window(p))
667                                 ; /* nothing */
668                         win->base = xmmap_gently(NULL, win->len,
669                                 PROT_READ, MAP_PRIVATE,
670                                 p->pack_fd, win->offset);
671                         if (win->base == MAP_FAILED)
672                                 die_errno("packfile %s cannot be mapped",
673                                           p->pack_name);
674                         if (!win->offset && win->len == p->pack_size
675                                 && !p->do_not_close)
676                                 close_pack_fd(p);
677                         pack_mmap_calls++;
678                         pack_open_windows++;
679                         if (pack_mapped > peak_pack_mapped)
680                                 peak_pack_mapped = pack_mapped;
681                         if (pack_open_windows > peak_pack_open_windows)
682                                 peak_pack_open_windows = pack_open_windows;
683                         win->next = p->windows;
684                         p->windows = win;
685                 }
686         }
687         if (win != *w_cursor) {
688                 win->last_used = pack_used_ctr++;
689                 win->inuse_cnt++;
690                 *w_cursor = win;
691         }
692         offset -= win->offset;
693         if (left)
694                 *left = win->len - xsize_t(offset);
695         return win->base + offset;
696 }
697
698 void unuse_pack(struct pack_window **w_cursor)
699 {
700         struct pack_window *w = *w_cursor;
701         if (w) {
702                 w->inuse_cnt--;
703                 *w_cursor = NULL;
704         }
705 }
706
707 struct packed_git *add_packed_git(const char *path, size_t path_len, int local)
708 {
709         struct stat st;
710         size_t alloc;
711         struct packed_git *p;
712
713         /*
714          * Make sure a corresponding .pack file exists and that
715          * the index looks sane.
716          */
717         if (!strip_suffix_mem(path, &path_len, ".idx"))
718                 return NULL;
719
720         /*
721          * ".promisor" is long enough to hold any suffix we're adding (and
722          * the use xsnprintf double-checks that)
723          */
724         alloc = st_add3(path_len, strlen(".promisor"), 1);
725         p = alloc_packed_git(alloc);
726         memcpy(p->pack_name, path, path_len);
727
728         xsnprintf(p->pack_name + path_len, alloc - path_len, ".keep");
729         if (!access(p->pack_name, F_OK))
730                 p->pack_keep = 1;
731
732         xsnprintf(p->pack_name + path_len, alloc - path_len, ".promisor");
733         if (!access(p->pack_name, F_OK))
734                 p->pack_promisor = 1;
735
736         xsnprintf(p->pack_name + path_len, alloc - path_len, ".pack");
737         if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) {
738                 free(p);
739                 return NULL;
740         }
741
742         /* ok, it looks sane as far as we can check without
743          * actually mapping the pack file.
744          */
745         p->pack_size = st.st_size;
746         p->pack_local = local;
747         p->mtime = st.st_mtime;
748         if (path_len < the_hash_algo->hexsz ||
749             get_sha1_hex(path + path_len - the_hash_algo->hexsz, p->hash))
750                 hashclr(p->hash);
751         return p;
752 }
753
754 void install_packed_git(struct repository *r, struct packed_git *pack)
755 {
756         if (pack->pack_fd != -1)
757                 pack_open_fds++;
758
759         pack->next = r->objects->packed_git;
760         r->objects->packed_git = pack;
761 }
762
763 void (*report_garbage)(unsigned seen_bits, const char *path);
764
765 static void report_helper(const struct string_list *list,
766                           int seen_bits, int first, int last)
767 {
768         if (seen_bits == (PACKDIR_FILE_PACK|PACKDIR_FILE_IDX))
769                 return;
770
771         for (; first < last; first++)
772                 report_garbage(seen_bits, list->items[first].string);
773 }
774
775 static void report_pack_garbage(struct string_list *list)
776 {
777         int i, baselen = -1, first = 0, seen_bits = 0;
778
779         if (!report_garbage)
780                 return;
781
782         string_list_sort(list);
783
784         for (i = 0; i < list->nr; i++) {
785                 const char *path = list->items[i].string;
786                 if (baselen != -1 &&
787                     strncmp(path, list->items[first].string, baselen)) {
788                         report_helper(list, seen_bits, first, i);
789                         baselen = -1;
790                         seen_bits = 0;
791                 }
792                 if (baselen == -1) {
793                         const char *dot = strrchr(path, '.');
794                         if (!dot) {
795                                 report_garbage(PACKDIR_FILE_GARBAGE, path);
796                                 continue;
797                         }
798                         baselen = dot - path + 1;
799                         first = i;
800                 }
801                 if (!strcmp(path + baselen, "pack"))
802                         seen_bits |= 1;
803                 else if (!strcmp(path + baselen, "idx"))
804                         seen_bits |= 2;
805         }
806         report_helper(list, seen_bits, first, list->nr);
807 }
808
809 void for_each_file_in_pack_dir(const char *objdir,
810                                each_file_in_pack_dir_fn fn,
811                                void *data)
812 {
813         struct strbuf path = STRBUF_INIT;
814         size_t dirnamelen;
815         DIR *dir;
816         struct dirent *de;
817
818         strbuf_addstr(&path, objdir);
819         strbuf_addstr(&path, "/pack");
820         dir = opendir(path.buf);
821         if (!dir) {
822                 if (errno != ENOENT)
823                         error_errno("unable to open object pack directory: %s",
824                                     path.buf);
825                 strbuf_release(&path);
826                 return;
827         }
828         strbuf_addch(&path, '/');
829         dirnamelen = path.len;
830         while ((de = readdir(dir)) != NULL) {
831                 if (is_dot_or_dotdot(de->d_name))
832                         continue;
833
834                 strbuf_setlen(&path, dirnamelen);
835                 strbuf_addstr(&path, de->d_name);
836
837                 fn(path.buf, path.len, de->d_name, data);
838         }
839
840         closedir(dir);
841         strbuf_release(&path);
842 }
843
844 struct prepare_pack_data {
845         struct repository *r;
846         struct string_list *garbage;
847         int local;
848         struct multi_pack_index *m;
849 };
850
851 static void prepare_pack(const char *full_name, size_t full_name_len,
852                          const char *file_name, void *_data)
853 {
854         struct prepare_pack_data *data = (struct prepare_pack_data *)_data;
855         struct packed_git *p;
856         size_t base_len = full_name_len;
857
858         if (strip_suffix_mem(full_name, &base_len, ".idx") &&
859             !(data->m && midx_contains_pack(data->m, file_name))) {
860                 /* Don't reopen a pack we already have. */
861                 for (p = data->r->objects->packed_git; p; p = p->next) {
862                         size_t len;
863                         if (strip_suffix(p->pack_name, ".pack", &len) &&
864                             len == base_len &&
865                             !memcmp(p->pack_name, full_name, len))
866                                 break;
867                 }
868
869                 if (!p) {
870                         p = add_packed_git(full_name, full_name_len, data->local);
871                         if (p)
872                                 install_packed_git(data->r, p);
873                 }
874         }
875
876         if (!report_garbage)
877                 return;
878
879         if (!strcmp(file_name, "multi-pack-index"))
880                 return;
881         if (ends_with(file_name, ".idx") ||
882             ends_with(file_name, ".pack") ||
883             ends_with(file_name, ".bitmap") ||
884             ends_with(file_name, ".keep") ||
885             ends_with(file_name, ".promisor"))
886                 string_list_append(data->garbage, full_name);
887         else
888                 report_garbage(PACKDIR_FILE_GARBAGE, full_name);
889 }
890
891 static void prepare_packed_git_one(struct repository *r, char *objdir, int local)
892 {
893         struct prepare_pack_data data;
894         struct string_list garbage = STRING_LIST_INIT_DUP;
895
896         data.m = r->objects->multi_pack_index;
897
898         /* look for the multi-pack-index for this object directory */
899         while (data.m && strcmp(data.m->object_dir, objdir))
900                 data.m = data.m->next;
901
902         data.r = r;
903         data.garbage = &garbage;
904         data.local = local;
905
906         for_each_file_in_pack_dir(objdir, prepare_pack, &data);
907
908         report_pack_garbage(data.garbage);
909         string_list_clear(data.garbage, 0);
910 }
911
912 static void prepare_packed_git(struct repository *r);
913 /*
914  * Give a fast, rough count of the number of objects in the repository. This
915  * ignores loose objects completely. If you have a lot of them, then either
916  * you should repack because your performance will be awful, or they are
917  * all unreachable objects about to be pruned, in which case they're not really
918  * interesting as a measure of repo size in the first place.
919  */
920 unsigned long repo_approximate_object_count(struct repository *r)
921 {
922         if (!r->objects->approximate_object_count_valid) {
923                 unsigned long count;
924                 struct multi_pack_index *m;
925                 struct packed_git *p;
926
927                 prepare_packed_git(r);
928                 count = 0;
929                 for (m = get_multi_pack_index(r); m; m = m->next)
930                         count += m->num_objects;
931                 for (p = r->objects->packed_git; p; p = p->next) {
932                         if (open_pack_index(p))
933                                 continue;
934                         count += p->num_objects;
935                 }
936                 r->objects->approximate_object_count = count;
937         }
938         return r->objects->approximate_object_count;
939 }
940
941 static void *get_next_packed_git(const void *p)
942 {
943         return ((const struct packed_git *)p)->next;
944 }
945
946 static void set_next_packed_git(void *p, void *next)
947 {
948         ((struct packed_git *)p)->next = next;
949 }
950
951 static int sort_pack(const void *a_, const void *b_)
952 {
953         const struct packed_git *a = a_;
954         const struct packed_git *b = b_;
955         int st;
956
957         /*
958          * Local packs tend to contain objects specific to our
959          * variant of the project than remote ones.  In addition,
960          * remote ones could be on a network mounted filesystem.
961          * Favor local ones for these reasons.
962          */
963         st = a->pack_local - b->pack_local;
964         if (st)
965                 return -st;
966
967         /*
968          * Younger packs tend to contain more recent objects,
969          * and more recent objects tend to get accessed more
970          * often.
971          */
972         if (a->mtime < b->mtime)
973                 return 1;
974         else if (a->mtime == b->mtime)
975                 return 0;
976         return -1;
977 }
978
979 static void rearrange_packed_git(struct repository *r)
980 {
981         r->objects->packed_git = llist_mergesort(
982                 r->objects->packed_git, get_next_packed_git,
983                 set_next_packed_git, sort_pack);
984 }
985
986 static void prepare_packed_git_mru(struct repository *r)
987 {
988         struct packed_git *p;
989
990         INIT_LIST_HEAD(&r->objects->packed_git_mru);
991
992         for (p = r->objects->packed_git; p; p = p->next)
993                 list_add_tail(&p->mru, &r->objects->packed_git_mru);
994 }
995
996 static void prepare_packed_git(struct repository *r)
997 {
998         struct object_directory *odb;
999
1000         if (r->objects->packed_git_initialized)
1001                 return;
1002
1003         prepare_alt_odb(r);
1004         for (odb = r->objects->odb; odb; odb = odb->next) {
1005                 int local = (odb == r->objects->odb);
1006                 prepare_multi_pack_index_one(r, odb->path, local);
1007                 prepare_packed_git_one(r, odb->path, local);
1008         }
1009         rearrange_packed_git(r);
1010
1011         prepare_packed_git_mru(r);
1012         r->objects->packed_git_initialized = 1;
1013 }
1014
1015 void reprepare_packed_git(struct repository *r)
1016 {
1017         struct object_directory *odb;
1018
1019         for (odb = r->objects->odb; odb; odb = odb->next)
1020                 odb_clear_loose_cache(odb);
1021
1022         r->objects->approximate_object_count_valid = 0;
1023         r->objects->packed_git_initialized = 0;
1024         prepare_packed_git(r);
1025 }
1026
1027 struct packed_git *get_packed_git(struct repository *r)
1028 {
1029         prepare_packed_git(r);
1030         return r->objects->packed_git;
1031 }
1032
1033 struct multi_pack_index *get_multi_pack_index(struct repository *r)
1034 {
1035         prepare_packed_git(r);
1036         return r->objects->multi_pack_index;
1037 }
1038
1039 struct packed_git *get_all_packs(struct repository *r)
1040 {
1041         struct multi_pack_index *m;
1042
1043         prepare_packed_git(r);
1044         for (m = r->objects->multi_pack_index; m; m = m->next) {
1045                 uint32_t i;
1046                 for (i = 0; i < m->num_packs; i++)
1047                         prepare_midx_pack(r, m, i);
1048         }
1049
1050         return r->objects->packed_git;
1051 }
1052
1053 struct list_head *get_packed_git_mru(struct repository *r)
1054 {
1055         prepare_packed_git(r);
1056         return &r->objects->packed_git_mru;
1057 }
1058
1059 unsigned long unpack_object_header_buffer(const unsigned char *buf,
1060                 unsigned long len, enum object_type *type, unsigned long *sizep)
1061 {
1062         unsigned shift;
1063         unsigned long size, c;
1064         unsigned long used = 0;
1065
1066         c = buf[used++];
1067         *type = (c >> 4) & 7;
1068         size = c & 15;
1069         shift = 4;
1070         while (c & 0x80) {
1071                 if (len <= used || bitsizeof(long) <= shift) {
1072                         error("bad object header");
1073                         size = used = 0;
1074                         break;
1075                 }
1076                 c = buf[used++];
1077                 size += (c & 0x7f) << shift;
1078                 shift += 7;
1079         }
1080         *sizep = size;
1081         return used;
1082 }
1083
1084 unsigned long get_size_from_delta(struct packed_git *p,
1085                                   struct pack_window **w_curs,
1086                                   off_t curpos)
1087 {
1088         const unsigned char *data;
1089         unsigned char delta_head[20], *in;
1090         git_zstream stream;
1091         int st;
1092
1093         memset(&stream, 0, sizeof(stream));
1094         stream.next_out = delta_head;
1095         stream.avail_out = sizeof(delta_head);
1096
1097         git_inflate_init(&stream);
1098         do {
1099                 in = use_pack(p, w_curs, curpos, &stream.avail_in);
1100                 stream.next_in = in;
1101                 st = git_inflate(&stream, Z_FINISH);
1102                 curpos += stream.next_in - in;
1103         } while ((st == Z_OK || st == Z_BUF_ERROR) &&
1104                  stream.total_out < sizeof(delta_head));
1105         git_inflate_end(&stream);
1106         if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) {
1107                 error("delta data unpack-initial failed");
1108                 return 0;
1109         }
1110
1111         /* Examine the initial part of the delta to figure out
1112          * the result size.
1113          */
1114         data = delta_head;
1115
1116         /* ignore base size */
1117         get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
1118
1119         /* Read the result size */
1120         return get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
1121 }
1122
1123 int unpack_object_header(struct packed_git *p,
1124                          struct pack_window **w_curs,
1125                          off_t *curpos,
1126                          unsigned long *sizep)
1127 {
1128         unsigned char *base;
1129         unsigned long left;
1130         unsigned long used;
1131         enum object_type type;
1132
1133         /* use_pack() assures us we have [base, base + 20) available
1134          * as a range that we can look at.  (Its actually the hash
1135          * size that is assured.)  With our object header encoding
1136          * the maximum deflated object size is 2^137, which is just
1137          * insane, so we know won't exceed what we have been given.
1138          */
1139         base = use_pack(p, w_curs, *curpos, &left);
1140         used = unpack_object_header_buffer(base, left, &type, sizep);
1141         if (!used) {
1142                 type = OBJ_BAD;
1143         } else
1144                 *curpos += used;
1145
1146         return type;
1147 }
1148
1149 void mark_bad_packed_object(struct packed_git *p, const unsigned char *sha1)
1150 {
1151         unsigned i;
1152         const unsigned hashsz = the_hash_algo->rawsz;
1153         for (i = 0; i < p->num_bad_objects; i++)
1154                 if (hasheq(sha1, p->bad_object_sha1 + hashsz * i))
1155                         return;
1156         p->bad_object_sha1 = xrealloc(p->bad_object_sha1,
1157                                       st_mult(GIT_MAX_RAWSZ,
1158                                               st_add(p->num_bad_objects, 1)));
1159         hashcpy(p->bad_object_sha1 + hashsz * p->num_bad_objects, sha1);
1160         p->num_bad_objects++;
1161 }
1162
1163 const struct packed_git *has_packed_and_bad(struct repository *r,
1164                                             const unsigned char *sha1)
1165 {
1166         struct packed_git *p;
1167         unsigned i;
1168
1169         for (p = r->objects->packed_git; p; p = p->next)
1170                 for (i = 0; i < p->num_bad_objects; i++)
1171                         if (hasheq(sha1,
1172                                    p->bad_object_sha1 + the_hash_algo->rawsz * i))
1173                                 return p;
1174         return NULL;
1175 }
1176
1177 static off_t get_delta_base(struct packed_git *p,
1178                                     struct pack_window **w_curs,
1179                                     off_t *curpos,
1180                                     enum object_type type,
1181                                     off_t delta_obj_offset)
1182 {
1183         unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL);
1184         off_t base_offset;
1185
1186         /* use_pack() assured us we have [base_info, base_info + 20)
1187          * as a range that we can look at without walking off the
1188          * end of the mapped window.  Its actually the hash size
1189          * that is assured.  An OFS_DELTA longer than the hash size
1190          * is stupid, as then a REF_DELTA would be smaller to store.
1191          */
1192         if (type == OBJ_OFS_DELTA) {
1193                 unsigned used = 0;
1194                 unsigned char c = base_info[used++];
1195                 base_offset = c & 127;
1196                 while (c & 128) {
1197                         base_offset += 1;
1198                         if (!base_offset || MSB(base_offset, 7))
1199                                 return 0;  /* overflow */
1200                         c = base_info[used++];
1201                         base_offset = (base_offset << 7) + (c & 127);
1202                 }
1203                 base_offset = delta_obj_offset - base_offset;
1204                 if (base_offset <= 0 || base_offset >= delta_obj_offset)
1205                         return 0;  /* out of bound */
1206                 *curpos += used;
1207         } else if (type == OBJ_REF_DELTA) {
1208                 /* The base entry _must_ be in the same pack */
1209                 base_offset = find_pack_entry_one(base_info, p);
1210                 *curpos += the_hash_algo->rawsz;
1211         } else
1212                 die("I am totally screwed");
1213         return base_offset;
1214 }
1215
1216 /*
1217  * Like get_delta_base above, but we return the sha1 instead of the pack
1218  * offset. This means it is cheaper for REF deltas (we do not have to do
1219  * the final object lookup), but more expensive for OFS deltas (we
1220  * have to load the revidx to convert the offset back into a sha1).
1221  */
1222 static const unsigned char *get_delta_base_sha1(struct packed_git *p,
1223                                                 struct pack_window **w_curs,
1224                                                 off_t curpos,
1225                                                 enum object_type type,
1226                                                 off_t delta_obj_offset)
1227 {
1228         if (type == OBJ_REF_DELTA) {
1229                 unsigned char *base = use_pack(p, w_curs, curpos, NULL);
1230                 return base;
1231         } else if (type == OBJ_OFS_DELTA) {
1232                 struct revindex_entry *revidx;
1233                 off_t base_offset = get_delta_base(p, w_curs, &curpos,
1234                                                    type, delta_obj_offset);
1235
1236                 if (!base_offset)
1237                         return NULL;
1238
1239                 revidx = find_pack_revindex(p, base_offset);
1240                 if (!revidx)
1241                         return NULL;
1242
1243                 return nth_packed_object_sha1(p, revidx->nr);
1244         } else
1245                 return NULL;
1246 }
1247
1248 static int retry_bad_packed_offset(struct repository *r,
1249                                    struct packed_git *p,
1250                                    off_t obj_offset)
1251 {
1252         int type;
1253         struct revindex_entry *revidx;
1254         struct object_id oid;
1255         revidx = find_pack_revindex(p, obj_offset);
1256         if (!revidx)
1257                 return OBJ_BAD;
1258         nth_packed_object_oid(&oid, p, revidx->nr);
1259         mark_bad_packed_object(p, oid.hash);
1260         type = oid_object_info(r, &oid, NULL);
1261         if (type <= OBJ_NONE)
1262                 return OBJ_BAD;
1263         return type;
1264 }
1265
1266 #define POI_STACK_PREALLOC 64
1267
1268 static enum object_type packed_to_object_type(struct repository *r,
1269                                               struct packed_git *p,
1270                                               off_t obj_offset,
1271                                               enum object_type type,
1272                                               struct pack_window **w_curs,
1273                                               off_t curpos)
1274 {
1275         off_t small_poi_stack[POI_STACK_PREALLOC];
1276         off_t *poi_stack = small_poi_stack;
1277         int poi_stack_nr = 0, poi_stack_alloc = POI_STACK_PREALLOC;
1278
1279         while (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) {
1280                 off_t base_offset;
1281                 unsigned long size;
1282                 /* Push the object we're going to leave behind */
1283                 if (poi_stack_nr >= poi_stack_alloc && poi_stack == small_poi_stack) {
1284                         poi_stack_alloc = alloc_nr(poi_stack_nr);
1285                         ALLOC_ARRAY(poi_stack, poi_stack_alloc);
1286                         COPY_ARRAY(poi_stack, small_poi_stack, poi_stack_nr);
1287                 } else {
1288                         ALLOC_GROW(poi_stack, poi_stack_nr+1, poi_stack_alloc);
1289                 }
1290                 poi_stack[poi_stack_nr++] = obj_offset;
1291                 /* If parsing the base offset fails, just unwind */
1292                 base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset);
1293                 if (!base_offset)
1294                         goto unwind;
1295                 curpos = obj_offset = base_offset;
1296                 type = unpack_object_header(p, w_curs, &curpos, &size);
1297                 if (type <= OBJ_NONE) {
1298                         /* If getting the base itself fails, we first
1299                          * retry the base, otherwise unwind */
1300                         type = retry_bad_packed_offset(r, p, base_offset);
1301                         if (type > OBJ_NONE)
1302                                 goto out;
1303                         goto unwind;
1304                 }
1305         }
1306
1307         switch (type) {
1308         case OBJ_BAD:
1309         case OBJ_COMMIT:
1310         case OBJ_TREE:
1311         case OBJ_BLOB:
1312         case OBJ_TAG:
1313                 break;
1314         default:
1315                 error("unknown object type %i at offset %"PRIuMAX" in %s",
1316                       type, (uintmax_t)obj_offset, p->pack_name);
1317                 type = OBJ_BAD;
1318         }
1319
1320 out:
1321         if (poi_stack != small_poi_stack)
1322                 free(poi_stack);
1323         return type;
1324
1325 unwind:
1326         while (poi_stack_nr) {
1327                 obj_offset = poi_stack[--poi_stack_nr];
1328                 type = retry_bad_packed_offset(r, p, obj_offset);
1329                 if (type > OBJ_NONE)
1330                         goto out;
1331         }
1332         type = OBJ_BAD;
1333         goto out;
1334 }
1335
1336 static struct hashmap delta_base_cache;
1337 static size_t delta_base_cached;
1338
1339 static LIST_HEAD(delta_base_cache_lru);
1340
1341 struct delta_base_cache_key {
1342         struct packed_git *p;
1343         off_t base_offset;
1344 };
1345
1346 struct delta_base_cache_entry {
1347         struct hashmap hash;
1348         struct delta_base_cache_key key;
1349         struct list_head lru;
1350         void *data;
1351         unsigned long size;
1352         enum object_type type;
1353 };
1354
1355 static unsigned int pack_entry_hash(struct packed_git *p, off_t base_offset)
1356 {
1357         unsigned int hash;
1358
1359         hash = (unsigned int)(intptr_t)p + (unsigned int)base_offset;
1360         hash += (hash >> 8) + (hash >> 16);
1361         return hash;
1362 }
1363
1364 static struct delta_base_cache_entry *
1365 get_delta_base_cache_entry(struct packed_git *p, off_t base_offset)
1366 {
1367         struct hashmap_entry entry;
1368         struct delta_base_cache_key key;
1369
1370         if (!delta_base_cache.cmpfn)
1371                 return NULL;
1372
1373         hashmap_entry_init(&entry, pack_entry_hash(p, base_offset));
1374         key.p = p;
1375         key.base_offset = base_offset;
1376         return hashmap_get(&delta_base_cache, &entry, &key);
1377 }
1378
1379 static int delta_base_cache_key_eq(const struct delta_base_cache_key *a,
1380                                    const struct delta_base_cache_key *b)
1381 {
1382         return a->p == b->p && a->base_offset == b->base_offset;
1383 }
1384
1385 static int delta_base_cache_hash_cmp(const void *unused_cmp_data,
1386                                      const void *va, const void *vb,
1387                                      const void *vkey)
1388 {
1389         const struct delta_base_cache_entry *a = va, *b = vb;
1390         const struct delta_base_cache_key *key = vkey;
1391         if (key)
1392                 return !delta_base_cache_key_eq(&a->key, key);
1393         else
1394                 return !delta_base_cache_key_eq(&a->key, &b->key);
1395 }
1396
1397 static int in_delta_base_cache(struct packed_git *p, off_t base_offset)
1398 {
1399         return !!get_delta_base_cache_entry(p, base_offset);
1400 }
1401
1402 /*
1403  * Remove the entry from the cache, but do _not_ free the associated
1404  * entry data. The caller takes ownership of the "data" buffer, and
1405  * should copy out any fields it wants before detaching.
1406  */
1407 static void detach_delta_base_cache_entry(struct delta_base_cache_entry *ent)
1408 {
1409         hashmap_remove(&delta_base_cache, ent, &ent->key);
1410         list_del(&ent->lru);
1411         delta_base_cached -= ent->size;
1412         free(ent);
1413 }
1414
1415 static void *cache_or_unpack_entry(struct repository *r, struct packed_git *p,
1416                                    off_t base_offset, unsigned long *base_size,
1417                                    enum object_type *type)
1418 {
1419         struct delta_base_cache_entry *ent;
1420
1421         ent = get_delta_base_cache_entry(p, base_offset);
1422         if (!ent)
1423                 return unpack_entry(r, p, base_offset, type, base_size);
1424
1425         if (type)
1426                 *type = ent->type;
1427         if (base_size)
1428                 *base_size = ent->size;
1429         return xmemdupz(ent->data, ent->size);
1430 }
1431
1432 static inline void release_delta_base_cache(struct delta_base_cache_entry *ent)
1433 {
1434         free(ent->data);
1435         detach_delta_base_cache_entry(ent);
1436 }
1437
1438 void clear_delta_base_cache(void)
1439 {
1440         struct list_head *lru, *tmp;
1441         list_for_each_safe(lru, tmp, &delta_base_cache_lru) {
1442                 struct delta_base_cache_entry *entry =
1443                         list_entry(lru, struct delta_base_cache_entry, lru);
1444                 release_delta_base_cache(entry);
1445         }
1446 }
1447
1448 static void add_delta_base_cache(struct packed_git *p, off_t base_offset,
1449         void *base, unsigned long base_size, enum object_type type)
1450 {
1451         struct delta_base_cache_entry *ent = xmalloc(sizeof(*ent));
1452         struct list_head *lru, *tmp;
1453
1454         delta_base_cached += base_size;
1455
1456         list_for_each_safe(lru, tmp, &delta_base_cache_lru) {
1457                 struct delta_base_cache_entry *f =
1458                         list_entry(lru, struct delta_base_cache_entry, lru);
1459                 if (delta_base_cached <= delta_base_cache_limit)
1460                         break;
1461                 release_delta_base_cache(f);
1462         }
1463
1464         ent->key.p = p;
1465         ent->key.base_offset = base_offset;
1466         ent->type = type;
1467         ent->data = base;
1468         ent->size = base_size;
1469         list_add_tail(&ent->lru, &delta_base_cache_lru);
1470
1471         if (!delta_base_cache.cmpfn)
1472                 hashmap_init(&delta_base_cache, delta_base_cache_hash_cmp, NULL, 0);
1473         hashmap_entry_init(ent, pack_entry_hash(p, base_offset));
1474         hashmap_add(&delta_base_cache, ent);
1475 }
1476
1477 int packed_object_info(struct repository *r, struct packed_git *p,
1478                        off_t obj_offset, struct object_info *oi)
1479 {
1480         struct pack_window *w_curs = NULL;
1481         unsigned long size;
1482         off_t curpos = obj_offset;
1483         enum object_type type;
1484
1485         /*
1486          * We always get the representation type, but only convert it to
1487          * a "real" type later if the caller is interested.
1488          */
1489         if (oi->contentp) {
1490                 *oi->contentp = cache_or_unpack_entry(r, p, obj_offset, oi->sizep,
1491                                                       &type);
1492                 if (!*oi->contentp)
1493                         type = OBJ_BAD;
1494         } else {
1495                 type = unpack_object_header(p, &w_curs, &curpos, &size);
1496         }
1497
1498         if (!oi->contentp && oi->sizep) {
1499                 if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) {
1500                         off_t tmp_pos = curpos;
1501                         off_t base_offset = get_delta_base(p, &w_curs, &tmp_pos,
1502                                                            type, obj_offset);
1503                         if (!base_offset) {
1504                                 type = OBJ_BAD;
1505                                 goto out;
1506                         }
1507                         *oi->sizep = get_size_from_delta(p, &w_curs, tmp_pos);
1508                         if (*oi->sizep == 0) {
1509                                 type = OBJ_BAD;
1510                                 goto out;
1511                         }
1512                 } else {
1513                         *oi->sizep = size;
1514                 }
1515         }
1516
1517         if (oi->disk_sizep) {
1518                 struct revindex_entry *revidx = find_pack_revindex(p, obj_offset);
1519                 *oi->disk_sizep = revidx[1].offset - obj_offset;
1520         }
1521
1522         if (oi->typep || oi->type_name) {
1523                 enum object_type ptot;
1524                 ptot = packed_to_object_type(r, p, obj_offset,
1525                                              type, &w_curs, curpos);
1526                 if (oi->typep)
1527                         *oi->typep = ptot;
1528                 if (oi->type_name) {
1529                         const char *tn = type_name(ptot);
1530                         if (tn)
1531                                 strbuf_addstr(oi->type_name, tn);
1532                 }
1533                 if (ptot < 0) {
1534                         type = OBJ_BAD;
1535                         goto out;
1536                 }
1537         }
1538
1539         if (oi->delta_base_sha1) {
1540                 if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) {
1541                         const unsigned char *base;
1542
1543                         base = get_delta_base_sha1(p, &w_curs, curpos,
1544                                                    type, obj_offset);
1545                         if (!base) {
1546                                 type = OBJ_BAD;
1547                                 goto out;
1548                         }
1549
1550                         hashcpy(oi->delta_base_sha1, base);
1551                 } else
1552                         hashclr(oi->delta_base_sha1);
1553         }
1554
1555         oi->whence = in_delta_base_cache(p, obj_offset) ? OI_DBCACHED :
1556                                                           OI_PACKED;
1557
1558 out:
1559         unuse_pack(&w_curs);
1560         return type;
1561 }
1562
1563 static void *unpack_compressed_entry(struct packed_git *p,
1564                                     struct pack_window **w_curs,
1565                                     off_t curpos,
1566                                     unsigned long size)
1567 {
1568         int st;
1569         git_zstream stream;
1570         unsigned char *buffer, *in;
1571
1572         buffer = xmallocz_gently(size);
1573         if (!buffer)
1574                 return NULL;
1575         memset(&stream, 0, sizeof(stream));
1576         stream.next_out = buffer;
1577         stream.avail_out = size + 1;
1578
1579         git_inflate_init(&stream);
1580         do {
1581                 in = use_pack(p, w_curs, curpos, &stream.avail_in);
1582                 stream.next_in = in;
1583                 st = git_inflate(&stream, Z_FINISH);
1584                 if (!stream.avail_out)
1585                         break; /* the payload is larger than it should be */
1586                 curpos += stream.next_in - in;
1587         } while (st == Z_OK || st == Z_BUF_ERROR);
1588         git_inflate_end(&stream);
1589         if ((st != Z_STREAM_END) || stream.total_out != size) {
1590                 free(buffer);
1591                 return NULL;
1592         }
1593
1594         /* versions of zlib can clobber unconsumed portion of outbuf */
1595         buffer[size] = '\0';
1596
1597         return buffer;
1598 }
1599
1600 static void write_pack_access_log(struct packed_git *p, off_t obj_offset)
1601 {
1602         static struct trace_key pack_access = TRACE_KEY_INIT(PACK_ACCESS);
1603         trace_printf_key(&pack_access, "%s %"PRIuMAX"\n",
1604                          p->pack_name, (uintmax_t)obj_offset);
1605 }
1606
1607 int do_check_packed_object_crc;
1608
1609 #define UNPACK_ENTRY_STACK_PREALLOC 64
1610 struct unpack_entry_stack_ent {
1611         off_t obj_offset;
1612         off_t curpos;
1613         unsigned long size;
1614 };
1615
1616 static void *read_object(struct repository *r,
1617                          const struct object_id *oid,
1618                          enum object_type *type,
1619                          unsigned long *size)
1620 {
1621         struct object_info oi = OBJECT_INFO_INIT;
1622         void *content;
1623         oi.typep = type;
1624         oi.sizep = size;
1625         oi.contentp = &content;
1626
1627         if (oid_object_info_extended(r, oid, &oi, 0) < 0)
1628                 return NULL;
1629         return content;
1630 }
1631
1632 void *unpack_entry(struct repository *r, struct packed_git *p, off_t obj_offset,
1633                    enum object_type *final_type, unsigned long *final_size)
1634 {
1635         struct pack_window *w_curs = NULL;
1636         off_t curpos = obj_offset;
1637         void *data = NULL;
1638         unsigned long size;
1639         enum object_type type;
1640         struct unpack_entry_stack_ent small_delta_stack[UNPACK_ENTRY_STACK_PREALLOC];
1641         struct unpack_entry_stack_ent *delta_stack = small_delta_stack;
1642         int delta_stack_nr = 0, delta_stack_alloc = UNPACK_ENTRY_STACK_PREALLOC;
1643         int base_from_cache = 0;
1644
1645         write_pack_access_log(p, obj_offset);
1646
1647         /* PHASE 1: drill down to the innermost base object */
1648         for (;;) {
1649                 off_t base_offset;
1650                 int i;
1651                 struct delta_base_cache_entry *ent;
1652
1653                 ent = get_delta_base_cache_entry(p, curpos);
1654                 if (ent) {
1655                         type = ent->type;
1656                         data = ent->data;
1657                         size = ent->size;
1658                         detach_delta_base_cache_entry(ent);
1659                         base_from_cache = 1;
1660                         break;
1661                 }
1662
1663                 if (do_check_packed_object_crc && p->index_version > 1) {
1664                         struct revindex_entry *revidx = find_pack_revindex(p, obj_offset);
1665                         off_t len = revidx[1].offset - obj_offset;
1666                         if (check_pack_crc(p, &w_curs, obj_offset, len, revidx->nr)) {
1667                                 struct object_id oid;
1668                                 nth_packed_object_oid(&oid, p, revidx->nr);
1669                                 error("bad packed object CRC for %s",
1670                                       oid_to_hex(&oid));
1671                                 mark_bad_packed_object(p, oid.hash);
1672                                 data = NULL;
1673                                 goto out;
1674                         }
1675                 }
1676
1677                 type = unpack_object_header(p, &w_curs, &curpos, &size);
1678                 if (type != OBJ_OFS_DELTA && type != OBJ_REF_DELTA)
1679                         break;
1680
1681                 base_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset);
1682                 if (!base_offset) {
1683                         error("failed to validate delta base reference "
1684                               "at offset %"PRIuMAX" from %s",
1685                               (uintmax_t)curpos, p->pack_name);
1686                         /* bail to phase 2, in hopes of recovery */
1687                         data = NULL;
1688                         break;
1689                 }
1690
1691                 /* push object, proceed to base */
1692                 if (delta_stack_nr >= delta_stack_alloc
1693                     && delta_stack == small_delta_stack) {
1694                         delta_stack_alloc = alloc_nr(delta_stack_nr);
1695                         ALLOC_ARRAY(delta_stack, delta_stack_alloc);
1696                         COPY_ARRAY(delta_stack, small_delta_stack,
1697                                    delta_stack_nr);
1698                 } else {
1699                         ALLOC_GROW(delta_stack, delta_stack_nr+1, delta_stack_alloc);
1700                 }
1701                 i = delta_stack_nr++;
1702                 delta_stack[i].obj_offset = obj_offset;
1703                 delta_stack[i].curpos = curpos;
1704                 delta_stack[i].size = size;
1705
1706                 curpos = obj_offset = base_offset;
1707         }
1708
1709         /* PHASE 2: handle the base */
1710         switch (type) {
1711         case OBJ_OFS_DELTA:
1712         case OBJ_REF_DELTA:
1713                 if (data)
1714                         BUG("unpack_entry: left loop at a valid delta");
1715                 break;
1716         case OBJ_COMMIT:
1717         case OBJ_TREE:
1718         case OBJ_BLOB:
1719         case OBJ_TAG:
1720                 if (!base_from_cache)
1721                         data = unpack_compressed_entry(p, &w_curs, curpos, size);
1722                 break;
1723         default:
1724                 data = NULL;
1725                 error("unknown object type %i at offset %"PRIuMAX" in %s",
1726                       type, (uintmax_t)obj_offset, p->pack_name);
1727         }
1728
1729         /* PHASE 3: apply deltas in order */
1730
1731         /* invariants:
1732          *   'data' holds the base data, or NULL if there was corruption
1733          */
1734         while (delta_stack_nr) {
1735                 void *delta_data;
1736                 void *base = data;
1737                 void *external_base = NULL;
1738                 unsigned long delta_size, base_size = size;
1739                 int i;
1740
1741                 data = NULL;
1742
1743                 if (base)
1744                         add_delta_base_cache(p, obj_offset, base, base_size, type);
1745
1746                 if (!base) {
1747                         /*
1748                          * We're probably in deep shit, but let's try to fetch
1749                          * the required base anyway from another pack or loose.
1750                          * This is costly but should happen only in the presence
1751                          * of a corrupted pack, and is better than failing outright.
1752                          */
1753                         struct revindex_entry *revidx;
1754                         struct object_id base_oid;
1755                         revidx = find_pack_revindex(p, obj_offset);
1756                         if (revidx) {
1757                                 nth_packed_object_oid(&base_oid, p, revidx->nr);
1758                                 error("failed to read delta base object %s"
1759                                       " at offset %"PRIuMAX" from %s",
1760                                       oid_to_hex(&base_oid), (uintmax_t)obj_offset,
1761                                       p->pack_name);
1762                                 mark_bad_packed_object(p, base_oid.hash);
1763                                 base = read_object(r, &base_oid, &type, &base_size);
1764                                 external_base = base;
1765                         }
1766                 }
1767
1768                 i = --delta_stack_nr;
1769                 obj_offset = delta_stack[i].obj_offset;
1770                 curpos = delta_stack[i].curpos;
1771                 delta_size = delta_stack[i].size;
1772
1773                 if (!base)
1774                         continue;
1775
1776                 delta_data = unpack_compressed_entry(p, &w_curs, curpos, delta_size);
1777
1778                 if (!delta_data) {
1779                         error("failed to unpack compressed delta "
1780                               "at offset %"PRIuMAX" from %s",
1781                               (uintmax_t)curpos, p->pack_name);
1782                         data = NULL;
1783                         free(external_base);
1784                         continue;
1785                 }
1786
1787                 data = patch_delta(base, base_size,
1788                                    delta_data, delta_size,
1789                                    &size);
1790
1791                 /*
1792                  * We could not apply the delta; warn the user, but keep going.
1793                  * Our failure will be noticed either in the next iteration of
1794                  * the loop, or if this is the final delta, in the caller when
1795                  * we return NULL. Those code paths will take care of making
1796                  * a more explicit warning and retrying with another copy of
1797                  * the object.
1798                  */
1799                 if (!data)
1800                         error("failed to apply delta");
1801
1802                 free(delta_data);
1803                 free(external_base);
1804         }
1805
1806         if (final_type)
1807                 *final_type = type;
1808         if (final_size)
1809                 *final_size = size;
1810
1811 out:
1812         unuse_pack(&w_curs);
1813
1814         if (delta_stack != small_delta_stack)
1815                 free(delta_stack);
1816
1817         return data;
1818 }
1819
1820 int bsearch_pack(const struct object_id *oid, const struct packed_git *p, uint32_t *result)
1821 {
1822         const unsigned char *index_fanout = p->index_data;
1823         const unsigned char *index_lookup;
1824         const unsigned int hashsz = the_hash_algo->rawsz;
1825         int index_lookup_width;
1826
1827         if (!index_fanout)
1828                 BUG("bsearch_pack called without a valid pack-index");
1829
1830         index_lookup = index_fanout + 4 * 256;
1831         if (p->index_version == 1) {
1832                 index_lookup_width = hashsz + 4;
1833                 index_lookup += 4;
1834         } else {
1835                 index_lookup_width = hashsz;
1836                 index_fanout += 8;
1837                 index_lookup += 8;
1838         }
1839
1840         return bsearch_hash(oid->hash, (const uint32_t*)index_fanout,
1841                             index_lookup, index_lookup_width, result);
1842 }
1843
1844 const unsigned char *nth_packed_object_sha1(struct packed_git *p,
1845                                             uint32_t n)
1846 {
1847         const unsigned char *index = p->index_data;
1848         const unsigned int hashsz = the_hash_algo->rawsz;
1849         if (!index) {
1850                 if (open_pack_index(p))
1851                         return NULL;
1852                 index = p->index_data;
1853         }
1854         if (n >= p->num_objects)
1855                 return NULL;
1856         index += 4 * 256;
1857         if (p->index_version == 1) {
1858                 return index + (hashsz + 4) * n + 4;
1859         } else {
1860                 index += 8;
1861                 return index + hashsz * n;
1862         }
1863 }
1864
1865 const struct object_id *nth_packed_object_oid(struct object_id *oid,
1866                                               struct packed_git *p,
1867                                               uint32_t n)
1868 {
1869         const unsigned char *hash = nth_packed_object_sha1(p, n);
1870         if (!hash)
1871                 return NULL;
1872         hashcpy(oid->hash, hash);
1873         return oid;
1874 }
1875
1876 void check_pack_index_ptr(const struct packed_git *p, const void *vptr)
1877 {
1878         const unsigned char *ptr = vptr;
1879         const unsigned char *start = p->index_data;
1880         const unsigned char *end = start + p->index_size;
1881         if (ptr < start)
1882                 die(_("offset before start of pack index for %s (corrupt index?)"),
1883                     p->pack_name);
1884         /* No need to check for underflow; .idx files must be at least 8 bytes */
1885         if (ptr >= end - 8)
1886                 die(_("offset beyond end of pack index for %s (truncated index?)"),
1887                     p->pack_name);
1888 }
1889
1890 off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n)
1891 {
1892         const unsigned char *index = p->index_data;
1893         const unsigned int hashsz = the_hash_algo->rawsz;
1894         index += 4 * 256;
1895         if (p->index_version == 1) {
1896                 return ntohl(*((uint32_t *)(index + (hashsz + 4) * n)));
1897         } else {
1898                 uint32_t off;
1899                 index += 8 + p->num_objects * (hashsz + 4);
1900                 off = ntohl(*((uint32_t *)(index + 4 * n)));
1901                 if (!(off & 0x80000000))
1902                         return off;
1903                 index += p->num_objects * 4 + (off & 0x7fffffff) * 8;
1904                 check_pack_index_ptr(p, index);
1905                 return get_be64(index);
1906         }
1907 }
1908
1909 off_t find_pack_entry_one(const unsigned char *sha1,
1910                                   struct packed_git *p)
1911 {
1912         const unsigned char *index = p->index_data;
1913         struct object_id oid;
1914         uint32_t result;
1915
1916         if (!index) {
1917                 if (open_pack_index(p))
1918                         return 0;
1919         }
1920
1921         hashcpy(oid.hash, sha1);
1922         if (bsearch_pack(&oid, p, &result))
1923                 return nth_packed_object_offset(p, result);
1924         return 0;
1925 }
1926
1927 int is_pack_valid(struct packed_git *p)
1928 {
1929         /* An already open pack is known to be valid. */
1930         if (p->pack_fd != -1)
1931                 return 1;
1932
1933         /* If the pack has one window completely covering the
1934          * file size, the pack is known to be valid even if
1935          * the descriptor is not currently open.
1936          */
1937         if (p->windows) {
1938                 struct pack_window *w = p->windows;
1939
1940                 if (!w->offset && w->len == p->pack_size)
1941                         return 1;
1942         }
1943
1944         /* Force the pack to open to prove its valid. */
1945         return !open_packed_git(p);
1946 }
1947
1948 struct packed_git *find_sha1_pack(const unsigned char *sha1,
1949                                   struct packed_git *packs)
1950 {
1951         struct packed_git *p;
1952
1953         for (p = packs; p; p = p->next) {
1954                 if (find_pack_entry_one(sha1, p))
1955                         return p;
1956         }
1957         return NULL;
1958
1959 }
1960
1961 static int fill_pack_entry(const struct object_id *oid,
1962                            struct pack_entry *e,
1963                            struct packed_git *p)
1964 {
1965         off_t offset;
1966
1967         if (p->num_bad_objects) {
1968                 unsigned i;
1969                 for (i = 0; i < p->num_bad_objects; i++)
1970                         if (hasheq(oid->hash,
1971                                    p->bad_object_sha1 + the_hash_algo->rawsz * i))
1972                                 return 0;
1973         }
1974
1975         offset = find_pack_entry_one(oid->hash, p);
1976         if (!offset)
1977                 return 0;
1978
1979         /*
1980          * We are about to tell the caller where they can locate the
1981          * requested object.  We better make sure the packfile is
1982          * still here and can be accessed before supplying that
1983          * answer, as it may have been deleted since the index was
1984          * loaded!
1985          */
1986         if (!is_pack_valid(p))
1987                 return 0;
1988         e->offset = offset;
1989         e->p = p;
1990         return 1;
1991 }
1992
1993 int find_pack_entry(struct repository *r, const struct object_id *oid, struct pack_entry *e)
1994 {
1995         struct list_head *pos;
1996         struct multi_pack_index *m;
1997
1998         prepare_packed_git(r);
1999         if (!r->objects->packed_git && !r->objects->multi_pack_index)
2000                 return 0;
2001
2002         for (m = r->objects->multi_pack_index; m; m = m->next) {
2003                 if (fill_midx_entry(r, oid, e, m))
2004                         return 1;
2005         }
2006
2007         list_for_each(pos, &r->objects->packed_git_mru) {
2008                 struct packed_git *p = list_entry(pos, struct packed_git, mru);
2009                 if (!p->multi_pack_index && fill_pack_entry(oid, e, p)) {
2010                         list_move(&p->mru, &r->objects->packed_git_mru);
2011                         return 1;
2012                 }
2013         }
2014         return 0;
2015 }
2016
2017 int has_object_pack(const struct object_id *oid)
2018 {
2019         struct pack_entry e;
2020         return find_pack_entry(the_repository, oid, &e);
2021 }
2022
2023 int has_pack_index(const unsigned char *sha1)
2024 {
2025         struct stat st;
2026         if (stat(sha1_pack_index_name(sha1), &st))
2027                 return 0;
2028         return 1;
2029 }
2030
2031 int for_each_object_in_pack(struct packed_git *p,
2032                             each_packed_object_fn cb, void *data,
2033                             enum for_each_object_flags flags)
2034 {
2035         uint32_t i;
2036         int r = 0;
2037
2038         if (flags & FOR_EACH_OBJECT_PACK_ORDER) {
2039                 if (load_pack_revindex(p))
2040                         return -1;
2041         }
2042
2043         for (i = 0; i < p->num_objects; i++) {
2044                 uint32_t pos;
2045                 struct object_id oid;
2046
2047                 if (flags & FOR_EACH_OBJECT_PACK_ORDER)
2048                         pos = p->revindex[i].nr;
2049                 else
2050                         pos = i;
2051
2052                 if (!nth_packed_object_oid(&oid, p, pos))
2053                         return error("unable to get sha1 of object %u in %s",
2054                                      pos, p->pack_name);
2055
2056                 r = cb(&oid, p, pos, data);
2057                 if (r)
2058                         break;
2059         }
2060         return r;
2061 }
2062
2063 int for_each_packed_object(each_packed_object_fn cb, void *data,
2064                            enum for_each_object_flags flags)
2065 {
2066         struct packed_git *p;
2067         int r = 0;
2068         int pack_errors = 0;
2069
2070         prepare_packed_git(the_repository);
2071         for (p = get_all_packs(the_repository); p; p = p->next) {
2072                 if ((flags & FOR_EACH_OBJECT_LOCAL_ONLY) && !p->pack_local)
2073                         continue;
2074                 if ((flags & FOR_EACH_OBJECT_PROMISOR_ONLY) &&
2075                     !p->pack_promisor)
2076                         continue;
2077                 if (open_pack_index(p)) {
2078                         pack_errors = 1;
2079                         continue;
2080                 }
2081                 r = for_each_object_in_pack(p, cb, data, flags);
2082                 if (r)
2083                         break;
2084         }
2085         return r ? r : pack_errors;
2086 }
2087
2088 static int add_promisor_object(const struct object_id *oid,
2089                                struct packed_git *pack,
2090                                uint32_t pos,
2091                                void *set_)
2092 {
2093         struct oidset *set = set_;
2094         struct object *obj = parse_object(the_repository, oid);
2095         if (!obj)
2096                 return 1;
2097
2098         oidset_insert(set, oid);
2099
2100         /*
2101          * If this is a tree, commit, or tag, the objects it refers
2102          * to are also promisor objects. (Blobs refer to no objects->)
2103          */
2104         if (obj->type == OBJ_TREE) {
2105                 struct tree *tree = (struct tree *)obj;
2106                 struct tree_desc desc;
2107                 struct name_entry entry;
2108                 if (init_tree_desc_gently(&desc, tree->buffer, tree->size))
2109                         /*
2110                          * Error messages are given when packs are
2111                          * verified, so do not print any here.
2112                          */
2113                         return 0;
2114                 while (tree_entry_gently(&desc, &entry))
2115                         oidset_insert(set, &entry.oid);
2116         } else if (obj->type == OBJ_COMMIT) {
2117                 struct commit *commit = (struct commit *) obj;
2118                 struct commit_list *parents = commit->parents;
2119
2120                 oidset_insert(set, get_commit_tree_oid(commit));
2121                 for (; parents; parents = parents->next)
2122                         oidset_insert(set, &parents->item->object.oid);
2123         } else if (obj->type == OBJ_TAG) {
2124                 struct tag *tag = (struct tag *) obj;
2125                 oidset_insert(set, get_tagged_oid(tag));
2126         }
2127         return 0;
2128 }
2129
2130 int is_promisor_object(const struct object_id *oid)
2131 {
2132         static struct oidset promisor_objects;
2133         static int promisor_objects_prepared;
2134
2135         if (!promisor_objects_prepared) {
2136                 if (has_promisor_remote()) {
2137                         for_each_packed_object(add_promisor_object,
2138                                                &promisor_objects,
2139                                                FOR_EACH_OBJECT_PROMISOR_ONLY);
2140                 }
2141                 promisor_objects_prepared = 1;
2142         }
2143         return oidset_contains(&promisor_objects, oid);
2144 }