Merge branch 'dp/autoconf-curl-ssl'
[git] / builtin / repack.c
1 #include "builtin.h"
2 #include "cache.h"
3 #include "dir.h"
4 #include "parse-options.h"
5 #include "run-command.h"
6 #include "sigchain.h"
7 #include "strbuf.h"
8 #include "string-list.h"
9 #include "argv-array.h"
10
11 static int delta_base_offset = 1;
12 static int pack_kept_objects = -1;
13 static int write_bitmaps;
14 static char *packdir, *packtmp;
15
16 static const char *const git_repack_usage[] = {
17         N_("git repack [<options>]"),
18         NULL
19 };
20
21 static int repack_config(const char *var, const char *value, void *cb)
22 {
23         if (!strcmp(var, "repack.usedeltabaseoffset")) {
24                 delta_base_offset = git_config_bool(var, value);
25                 return 0;
26         }
27         if (!strcmp(var, "repack.packkeptobjects")) {
28                 pack_kept_objects = git_config_bool(var, value);
29                 return 0;
30         }
31         if (!strcmp(var, "repack.writebitmaps") ||
32             !strcmp(var, "pack.writebitmaps")) {
33                 write_bitmaps = git_config_bool(var, value);
34                 return 0;
35         }
36         return git_default_config(var, value, cb);
37 }
38
39 /*
40  * Remove temporary $GIT_OBJECT_DIRECTORY/pack/.tmp-$$-pack-* files.
41  */
42 static void remove_temporary_files(void)
43 {
44         struct strbuf buf = STRBUF_INIT;
45         size_t dirlen, prefixlen;
46         DIR *dir;
47         struct dirent *e;
48
49         dir = opendir(packdir);
50         if (!dir)
51                 return;
52
53         /* Point at the slash at the end of ".../objects/pack/" */
54         dirlen = strlen(packdir) + 1;
55         strbuf_addstr(&buf, packtmp);
56         /* Hold the length of  ".tmp-%d-pack-" */
57         prefixlen = buf.len - dirlen;
58
59         while ((e = readdir(dir))) {
60                 if (strncmp(e->d_name, buf.buf + dirlen, prefixlen))
61                         continue;
62                 strbuf_setlen(&buf, dirlen);
63                 strbuf_addstr(&buf, e->d_name);
64                 unlink(buf.buf);
65         }
66         closedir(dir);
67         strbuf_release(&buf);
68 }
69
70 static void remove_pack_on_signal(int signo)
71 {
72         remove_temporary_files();
73         sigchain_pop(signo);
74         raise(signo);
75 }
76
77 /*
78  * Adds all packs hex strings to the fname list, which do not
79  * have a corresponding .keep file.
80  */
81 static void get_non_kept_pack_filenames(struct string_list *fname_list)
82 {
83         DIR *dir;
84         struct dirent *e;
85         char *fname;
86
87         if (!(dir = opendir(packdir)))
88                 return;
89
90         while ((e = readdir(dir)) != NULL) {
91                 size_t len;
92                 if (!strip_suffix(e->d_name, ".pack", &len))
93                         continue;
94
95                 fname = xmemdupz(e->d_name, len);
96
97                 if (!file_exists(mkpath("%s/%s.keep", packdir, fname)))
98                         string_list_append_nodup(fname_list, fname);
99                 else
100                         free(fname);
101         }
102         closedir(dir);
103 }
104
105 static void remove_redundant_pack(const char *dir_name, const char *base_name)
106 {
107         const char *exts[] = {".pack", ".idx", ".keep", ".bitmap"};
108         int i;
109         struct strbuf buf = STRBUF_INIT;
110         size_t plen;
111
112         strbuf_addf(&buf, "%s/%s", dir_name, base_name);
113         plen = buf.len;
114
115         for (i = 0; i < ARRAY_SIZE(exts); i++) {
116                 strbuf_setlen(&buf, plen);
117                 strbuf_addstr(&buf, exts[i]);
118                 unlink(buf.buf);
119         }
120         strbuf_release(&buf);
121 }
122
123 #define ALL_INTO_ONE 1
124 #define LOOSEN_UNREACHABLE 2
125
126 int cmd_repack(int argc, const char **argv, const char *prefix)
127 {
128         struct {
129                 const char *name;
130                 unsigned optional:1;
131         } exts[] = {
132                 {".pack"},
133                 {".idx"},
134                 {".bitmap", 1},
135         };
136         struct child_process cmd = CHILD_PROCESS_INIT;
137         struct string_list_item *item;
138         struct string_list names = STRING_LIST_INIT_DUP;
139         struct string_list rollback = STRING_LIST_INIT_NODUP;
140         struct string_list existing_packs = STRING_LIST_INIT_DUP;
141         struct strbuf line = STRBUF_INIT;
142         int ext, ret, failed;
143         FILE *out;
144
145         /* variables to be filled by option parsing */
146         int pack_everything = 0;
147         int delete_redundant = 0;
148         const char *unpack_unreachable = NULL;
149         int keep_unreachable = 0;
150         const char *window = NULL, *window_memory = NULL;
151         const char *depth = NULL;
152         const char *max_pack_size = NULL;
153         int no_reuse_delta = 0, no_reuse_object = 0;
154         int no_update_server_info = 0;
155         int quiet = 0;
156         int local = 0;
157
158         struct option builtin_repack_options[] = {
159                 OPT_BIT('a', NULL, &pack_everything,
160                                 N_("pack everything in a single pack"), ALL_INTO_ONE),
161                 OPT_BIT('A', NULL, &pack_everything,
162                                 N_("same as -a, and turn unreachable objects loose"),
163                                    LOOSEN_UNREACHABLE | ALL_INTO_ONE),
164                 OPT_BOOL('d', NULL, &delete_redundant,
165                                 N_("remove redundant packs, and run git-prune-packed")),
166                 OPT_BOOL('f', NULL, &no_reuse_delta,
167                                 N_("pass --no-reuse-delta to git-pack-objects")),
168                 OPT_BOOL('F', NULL, &no_reuse_object,
169                                 N_("pass --no-reuse-object to git-pack-objects")),
170                 OPT_BOOL('n', NULL, &no_update_server_info,
171                                 N_("do not run git-update-server-info")),
172                 OPT__QUIET(&quiet, N_("be quiet")),
173                 OPT_BOOL('l', "local", &local,
174                                 N_("pass --local to git-pack-objects")),
175                 OPT_BOOL('b', "write-bitmap-index", &write_bitmaps,
176                                 N_("write bitmap index")),
177                 OPT_STRING(0, "unpack-unreachable", &unpack_unreachable, N_("approxidate"),
178                                 N_("with -A, do not loosen objects older than this")),
179                 OPT_BOOL('k', "keep-unreachable", &keep_unreachable,
180                                 N_("with -a, repack unreachable objects")),
181                 OPT_STRING(0, "window", &window, N_("n"),
182                                 N_("size of the window used for delta compression")),
183                 OPT_STRING(0, "window-memory", &window_memory, N_("bytes"),
184                                 N_("same as the above, but limit memory size instead of entries count")),
185                 OPT_STRING(0, "depth", &depth, N_("n"),
186                                 N_("limits the maximum delta depth")),
187                 OPT_STRING(0, "max-pack-size", &max_pack_size, N_("bytes"),
188                                 N_("maximum size of each packfile")),
189                 OPT_BOOL(0, "pack-kept-objects", &pack_kept_objects,
190                                 N_("repack objects in packs marked with .keep")),
191                 OPT_END()
192         };
193
194         git_config(repack_config, NULL);
195
196         argc = parse_options(argc, argv, prefix, builtin_repack_options,
197                                 git_repack_usage, 0);
198
199         if (delete_redundant && repository_format_precious_objects)
200                 die(_("cannot delete packs in a precious-objects repo"));
201
202         if (keep_unreachable &&
203             (unpack_unreachable || (pack_everything & LOOSEN_UNREACHABLE)))
204                 die(_("--keep-unreachable and -A are incompatible"));
205
206         if (pack_kept_objects < 0)
207                 pack_kept_objects = write_bitmaps;
208
209         packdir = mkpathdup("%s/pack", get_object_directory());
210         packtmp = mkpathdup("%s/.tmp-%d-pack", packdir, (int)getpid());
211
212         sigchain_push_common(remove_pack_on_signal);
213
214         argv_array_push(&cmd.args, "pack-objects");
215         argv_array_push(&cmd.args, "--keep-true-parents");
216         if (!pack_kept_objects)
217                 argv_array_push(&cmd.args, "--honor-pack-keep");
218         argv_array_push(&cmd.args, "--non-empty");
219         argv_array_push(&cmd.args, "--all");
220         argv_array_push(&cmd.args, "--reflog");
221         argv_array_push(&cmd.args, "--indexed-objects");
222         if (window)
223                 argv_array_pushf(&cmd.args, "--window=%s", window);
224         if (window_memory)
225                 argv_array_pushf(&cmd.args, "--window-memory=%s", window_memory);
226         if (depth)
227                 argv_array_pushf(&cmd.args, "--depth=%s", depth);
228         if (max_pack_size)
229                 argv_array_pushf(&cmd.args, "--max-pack-size=%s", max_pack_size);
230         if (no_reuse_delta)
231                 argv_array_pushf(&cmd.args, "--no-reuse-delta");
232         if (no_reuse_object)
233                 argv_array_pushf(&cmd.args, "--no-reuse-object");
234         if (write_bitmaps)
235                 argv_array_push(&cmd.args, "--write-bitmap-index");
236
237         if (pack_everything & ALL_INTO_ONE) {
238                 get_non_kept_pack_filenames(&existing_packs);
239
240                 if (existing_packs.nr && delete_redundant) {
241                         if (unpack_unreachable) {
242                                 argv_array_pushf(&cmd.args,
243                                                 "--unpack-unreachable=%s",
244                                                 unpack_unreachable);
245                                 argv_array_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
246                         } else if (pack_everything & LOOSEN_UNREACHABLE) {
247                                 argv_array_push(&cmd.args,
248                                                 "--unpack-unreachable");
249                         } else if (keep_unreachable) {
250                                 argv_array_push(&cmd.args, "--keep-unreachable");
251                                 argv_array_push(&cmd.args, "--pack-loose-unreachable");
252                         } else {
253                                 argv_array_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
254                         }
255                 }
256         } else {
257                 argv_array_push(&cmd.args, "--unpacked");
258                 argv_array_push(&cmd.args, "--incremental");
259         }
260
261         if (local)
262                 argv_array_push(&cmd.args,  "--local");
263         if (quiet)
264                 argv_array_push(&cmd.args,  "--quiet");
265         if (delta_base_offset)
266                 argv_array_push(&cmd.args,  "--delta-base-offset");
267
268         argv_array_push(&cmd.args, packtmp);
269
270         cmd.git_cmd = 1;
271         cmd.out = -1;
272         cmd.no_stdin = 1;
273
274         ret = start_command(&cmd);
275         if (ret)
276                 return ret;
277
278         out = xfdopen(cmd.out, "r");
279         while (strbuf_getline_lf(&line, out) != EOF) {
280                 if (line.len != 40)
281                         die("repack: Expecting 40 character sha1 lines only from pack-objects.");
282                 string_list_append(&names, line.buf);
283         }
284         fclose(out);
285         ret = finish_command(&cmd);
286         if (ret)
287                 return ret;
288
289         if (!names.nr && !quiet)
290                 printf("Nothing new to pack.\n");
291
292         /*
293          * Ok we have prepared all new packfiles.
294          * First see if there are packs of the same name and if so
295          * if we can move them out of the way (this can happen if we
296          * repacked immediately after packing fully.
297          */
298         failed = 0;
299         for_each_string_list_item(item, &names) {
300                 for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
301                         char *fname, *fname_old;
302                         fname = mkpathdup("%s/pack-%s%s", packdir,
303                                                 item->string, exts[ext].name);
304                         if (!file_exists(fname)) {
305                                 free(fname);
306                                 continue;
307                         }
308
309                         fname_old = mkpathdup("%s/old-%s%s", packdir,
310                                                 item->string, exts[ext].name);
311                         if (file_exists(fname_old))
312                                 if (unlink(fname_old))
313                                         failed = 1;
314
315                         if (!failed && rename(fname, fname_old)) {
316                                 free(fname);
317                                 free(fname_old);
318                                 failed = 1;
319                                 break;
320                         } else {
321                                 string_list_append(&rollback, fname);
322                                 free(fname_old);
323                         }
324                 }
325                 if (failed)
326                         break;
327         }
328         if (failed) {
329                 struct string_list rollback_failure = STRING_LIST_INIT_DUP;
330                 for_each_string_list_item(item, &rollback) {
331                         char *fname, *fname_old;
332                         fname = mkpathdup("%s/%s", packdir, item->string);
333                         fname_old = mkpathdup("%s/old-%s", packdir, item->string);
334                         if (rename(fname_old, fname))
335                                 string_list_append(&rollback_failure, fname);
336                         free(fname);
337                         free(fname_old);
338                 }
339
340                 if (rollback_failure.nr) {
341                         int i;
342                         fprintf(stderr,
343                                 "WARNING: Some packs in use have been renamed by\n"
344                                 "WARNING: prefixing old- to their name, in order to\n"
345                                 "WARNING: replace them with the new version of the\n"
346                                 "WARNING: file.  But the operation failed, and the\n"
347                                 "WARNING: attempt to rename them back to their\n"
348                                 "WARNING: original names also failed.\n"
349                                 "WARNING: Please rename them in %s manually:\n", packdir);
350                         for (i = 0; i < rollback_failure.nr; i++)
351                                 fprintf(stderr, "WARNING:   old-%s -> %s\n",
352                                         rollback_failure.items[i].string,
353                                         rollback_failure.items[i].string);
354                 }
355                 exit(1);
356         }
357
358         /* Now the ones with the same name are out of the way... */
359         for_each_string_list_item(item, &names) {
360                 for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
361                         char *fname, *fname_old;
362                         struct stat statbuffer;
363                         int exists = 0;
364                         fname = mkpathdup("%s/pack-%s%s",
365                                         packdir, item->string, exts[ext].name);
366                         fname_old = mkpathdup("%s-%s%s",
367                                         packtmp, item->string, exts[ext].name);
368                         if (!stat(fname_old, &statbuffer)) {
369                                 statbuffer.st_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
370                                 chmod(fname_old, statbuffer.st_mode);
371                                 exists = 1;
372                         }
373                         if (exists || !exts[ext].optional) {
374                                 if (rename(fname_old, fname))
375                                         die_errno(_("renaming '%s' failed"), fname_old);
376                         }
377                         free(fname);
378                         free(fname_old);
379                 }
380         }
381
382         /* Remove the "old-" files */
383         for_each_string_list_item(item, &names) {
384                 for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
385                         char *fname;
386                         fname = mkpathdup("%s/old-%s%s",
387                                           packdir,
388                                           item->string,
389                                           exts[ext].name);
390                         if (remove_path(fname))
391                                 warning(_("failed to remove '%s'"), fname);
392                         free(fname);
393                 }
394         }
395
396         /* End of pack replacement. */
397
398         if (delete_redundant) {
399                 int opts = 0;
400                 string_list_sort(&names);
401                 for_each_string_list_item(item, &existing_packs) {
402                         char *sha1;
403                         size_t len = strlen(item->string);
404                         if (len < 40)
405                                 continue;
406                         sha1 = item->string + len - 40;
407                         if (!string_list_has_string(&names, sha1))
408                                 remove_redundant_pack(packdir, item->string);
409                 }
410                 if (!quiet && isatty(2))
411                         opts |= PRUNE_PACKED_VERBOSE;
412                 prune_packed_objects(opts);
413         }
414
415         if (!no_update_server_info)
416                 update_server_info(0);
417         remove_temporary_files();
418         string_list_clear(&names, 0);
419         string_list_clear(&rollback, 0);
420         string_list_clear(&existing_packs, 0);
421         strbuf_release(&line);
422
423         return 0;
424 }