match-trees: use hashcpy to splice trees
[git] / bundle.c
1 #include "cache.h"
2 #include "lockfile.h"
3 #include "bundle.h"
4 #include "object-store.h"
5 #include "repository.h"
6 #include "object.h"
7 #include "commit.h"
8 #include "diff.h"
9 #include "revision.h"
10 #include "list-objects.h"
11 #include "run-command.h"
12 #include "refs.h"
13 #include "argv-array.h"
14
15 static const char bundle_signature[] = "# v2 git bundle\n";
16
17 static void add_to_ref_list(const struct object_id *oid, const char *name,
18                 struct ref_list *list)
19 {
20         ALLOC_GROW(list->list, list->nr + 1, list->alloc);
21         oidcpy(&list->list[list->nr].oid, oid);
22         list->list[list->nr].name = xstrdup(name);
23         list->nr++;
24 }
25
26 static int parse_bundle_header(int fd, struct bundle_header *header,
27                                const char *report_path)
28 {
29         struct strbuf buf = STRBUF_INIT;
30         int status = 0;
31
32         /* The bundle header begins with the signature */
33         if (strbuf_getwholeline_fd(&buf, fd, '\n') ||
34             strcmp(buf.buf, bundle_signature)) {
35                 if (report_path)
36                         error(_("'%s' does not look like a v2 bundle file"),
37                               report_path);
38                 status = -1;
39                 goto abort;
40         }
41
42         /* The bundle header ends with an empty line */
43         while (!strbuf_getwholeline_fd(&buf, fd, '\n') &&
44                buf.len && buf.buf[0] != '\n') {
45                 struct object_id oid;
46                 int is_prereq = 0;
47                 const char *p;
48
49                 if (*buf.buf == '-') {
50                         is_prereq = 1;
51                         strbuf_remove(&buf, 0, 1);
52                 }
53                 strbuf_rtrim(&buf);
54
55                 /*
56                  * Tip lines have object name, SP, and refname.
57                  * Prerequisites have object name that is optionally
58                  * followed by SP and subject line.
59                  */
60                 if (parse_oid_hex(buf.buf, &oid, &p) ||
61                     (*p && !isspace(*p)) ||
62                     (!is_prereq && !*p)) {
63                         if (report_path)
64                                 error(_("unrecognized header: %s%s (%d)"),
65                                       (is_prereq ? "-" : ""), buf.buf, (int)buf.len);
66                         status = -1;
67                         break;
68                 } else {
69                         if (is_prereq)
70                                 add_to_ref_list(&oid, "", &header->prerequisites);
71                         else
72                                 add_to_ref_list(&oid, p + 1, &header->references);
73                 }
74         }
75
76  abort:
77         if (status) {
78                 close(fd);
79                 fd = -1;
80         }
81         strbuf_release(&buf);
82         return fd;
83 }
84
85 int read_bundle_header(const char *path, struct bundle_header *header)
86 {
87         int fd = open(path, O_RDONLY);
88
89         if (fd < 0)
90                 return error(_("could not open '%s'"), path);
91         return parse_bundle_header(fd, header, path);
92 }
93
94 int is_bundle(const char *path, int quiet)
95 {
96         struct bundle_header header;
97         int fd = open(path, O_RDONLY);
98
99         if (fd < 0)
100                 return 0;
101         memset(&header, 0, sizeof(header));
102         fd = parse_bundle_header(fd, &header, quiet ? NULL : path);
103         if (fd >= 0)
104                 close(fd);
105         return (fd >= 0);
106 }
107
108 static int list_refs(struct ref_list *r, int argc, const char **argv)
109 {
110         int i;
111
112         for (i = 0; i < r->nr; i++) {
113                 if (argc > 1) {
114                         int j;
115                         for (j = 1; j < argc; j++)
116                                 if (!strcmp(r->list[i].name, argv[j]))
117                                         break;
118                         if (j == argc)
119                                 continue;
120                 }
121                 printf("%s %s\n", oid_to_hex(&r->list[i].oid),
122                                 r->list[i].name);
123         }
124         return 0;
125 }
126
127 /* Remember to update object flag allocation in object.h */
128 #define PREREQ_MARK (1u<<16)
129
130 int verify_bundle(struct repository *r,
131                   struct bundle_header *header,
132                   int verbose)
133 {
134         /*
135          * Do fast check, then if any prereqs are missing then go line by line
136          * to be verbose about the errors
137          */
138         struct ref_list *p = &header->prerequisites;
139         struct rev_info revs;
140         const char *argv[] = {NULL, "--all", NULL};
141         struct commit *commit;
142         int i, ret = 0, req_nr;
143         const char *message = _("Repository lacks these prerequisite commits:");
144
145         repo_init_revisions(r, &revs, NULL);
146         for (i = 0; i < p->nr; i++) {
147                 struct ref_list_entry *e = p->list + i;
148                 struct object *o = parse_object(r, &e->oid);
149                 if (o) {
150                         o->flags |= PREREQ_MARK;
151                         add_pending_object(&revs, o, e->name);
152                         continue;
153                 }
154                 if (++ret == 1)
155                         error("%s", message);
156                 error("%s %s", oid_to_hex(&e->oid), e->name);
157         }
158         if (revs.pending.nr != p->nr)
159                 return ret;
160         req_nr = revs.pending.nr;
161         setup_revisions(2, argv, &revs, NULL);
162
163         if (prepare_revision_walk(&revs))
164                 die(_("revision walk setup failed"));
165
166         i = req_nr;
167         while (i && (commit = get_revision(&revs)))
168                 if (commit->object.flags & PREREQ_MARK)
169                         i--;
170
171         for (i = 0; i < p->nr; i++) {
172                 struct ref_list_entry *e = p->list + i;
173                 struct object *o = parse_object(r, &e->oid);
174                 assert(o); /* otherwise we'd have returned early */
175                 if (o->flags & SHOWN)
176                         continue;
177                 if (++ret == 1)
178                         error("%s", message);
179                 error("%s %s", oid_to_hex(&e->oid), e->name);
180         }
181
182         /* Clean up objects used, as they will be reused. */
183         for (i = 0; i < p->nr; i++) {
184                 struct ref_list_entry *e = p->list + i;
185                 commit = lookup_commit_reference_gently(r, &e->oid, 1);
186                 if (commit)
187                         clear_commit_marks(commit, ALL_REV_FLAGS);
188         }
189
190         if (verbose) {
191                 struct ref_list *r;
192
193                 r = &header->references;
194                 printf_ln(Q_("The bundle contains this ref:",
195                              "The bundle contains these %d refs:",
196                              r->nr),
197                           r->nr);
198                 list_refs(r, 0, NULL);
199                 r = &header->prerequisites;
200                 if (!r->nr) {
201                         printf_ln(_("The bundle records a complete history."));
202                 } else {
203                         printf_ln(Q_("The bundle requires this ref:",
204                                      "The bundle requires these %d refs:",
205                                      r->nr),
206                                   r->nr);
207                         list_refs(r, 0, NULL);
208                 }
209         }
210         return ret;
211 }
212
213 int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
214 {
215         return list_refs(&header->references, argc, argv);
216 }
217
218 static int is_tag_in_date_range(struct object *tag, struct rev_info *revs)
219 {
220         unsigned long size;
221         enum object_type type;
222         char *buf = NULL, *line, *lineend;
223         timestamp_t date;
224         int result = 1;
225
226         if (revs->max_age == -1 && revs->min_age == -1)
227                 goto out;
228
229         buf = read_object_file(&tag->oid, &type, &size);
230         if (!buf)
231                 goto out;
232         line = memmem(buf, size, "\ntagger ", 8);
233         if (!line++)
234                 goto out;
235         lineend = memchr(line, '\n', buf + size - line);
236         line = memchr(line, '>', lineend ? lineend - line : buf + size - line);
237         if (!line++)
238                 goto out;
239         date = parse_timestamp(line, NULL, 10);
240         result = (revs->max_age == -1 || revs->max_age < date) &&
241                 (revs->min_age == -1 || revs->min_age > date);
242 out:
243         free(buf);
244         return result;
245 }
246
247
248 /* Write the pack data to bundle_fd */
249 static int write_pack_data(int bundle_fd, struct rev_info *revs)
250 {
251         struct child_process pack_objects = CHILD_PROCESS_INIT;
252         int i;
253
254         argv_array_pushl(&pack_objects.args,
255                          "pack-objects", "--all-progress-implied",
256                          "--stdout", "--thin", "--delta-base-offset",
257                          NULL);
258         pack_objects.in = -1;
259         pack_objects.out = bundle_fd;
260         pack_objects.git_cmd = 1;
261
262         /*
263          * start_command() will close our descriptor if it's >1. Duplicate it
264          * to avoid surprising the caller.
265          */
266         if (pack_objects.out > 1) {
267                 pack_objects.out = dup(pack_objects.out);
268                 if (pack_objects.out < 0) {
269                         error_errno(_("unable to dup bundle descriptor"));
270                         child_process_clear(&pack_objects);
271                         return -1;
272                 }
273         }
274
275         if (start_command(&pack_objects))
276                 return error(_("Could not spawn pack-objects"));
277
278         for (i = 0; i < revs->pending.nr; i++) {
279                 struct object *object = revs->pending.objects[i].item;
280                 if (object->flags & UNINTERESTING)
281                         write_or_die(pack_objects.in, "^", 1);
282                 write_or_die(pack_objects.in, oid_to_hex(&object->oid), GIT_SHA1_HEXSZ);
283                 write_or_die(pack_objects.in, "\n", 1);
284         }
285         close(pack_objects.in);
286         if (finish_command(&pack_objects))
287                 return error(_("pack-objects died"));
288         return 0;
289 }
290
291 static int compute_and_write_prerequisites(int bundle_fd,
292                                            struct rev_info *revs,
293                                            int argc, const char **argv)
294 {
295         struct child_process rls = CHILD_PROCESS_INIT;
296         struct strbuf buf = STRBUF_INIT;
297         FILE *rls_fout;
298         int i;
299
300         argv_array_pushl(&rls.args,
301                          "rev-list", "--boundary", "--pretty=oneline",
302                          NULL);
303         for (i = 1; i < argc; i++)
304                 argv_array_push(&rls.args, argv[i]);
305         rls.out = -1;
306         rls.git_cmd = 1;
307         if (start_command(&rls))
308                 return -1;
309         rls_fout = xfdopen(rls.out, "r");
310         while (strbuf_getwholeline(&buf, rls_fout, '\n') != EOF) {
311                 struct object_id oid;
312                 if (buf.len > 0 && buf.buf[0] == '-') {
313                         write_or_die(bundle_fd, buf.buf, buf.len);
314                         if (!get_oid_hex(buf.buf + 1, &oid)) {
315                                 struct object *object = parse_object_or_die(&oid,
316                                                                             buf.buf);
317                                 object->flags |= UNINTERESTING;
318                                 add_pending_object(revs, object, buf.buf);
319                         }
320                 } else if (!get_oid_hex(buf.buf, &oid)) {
321                         struct object *object = parse_object_or_die(&oid,
322                                                                     buf.buf);
323                         object->flags |= SHOWN;
324                 }
325         }
326         strbuf_release(&buf);
327         fclose(rls_fout);
328         if (finish_command(&rls))
329                 return error(_("rev-list died"));
330         return 0;
331 }
332
333 /*
334  * Write out bundle refs based on the tips already
335  * parsed into revs.pending. As a side effect, may
336  * manipulate revs.pending to include additional
337  * necessary objects (like tags).
338  *
339  * Returns the number of refs written, or negative
340  * on error.
341  */
342 static int write_bundle_refs(int bundle_fd, struct rev_info *revs)
343 {
344         int i;
345         int ref_count = 0;
346
347         for (i = 0; i < revs->pending.nr; i++) {
348                 struct object_array_entry *e = revs->pending.objects + i;
349                 struct object_id oid;
350                 char *ref;
351                 const char *display_ref;
352                 int flag;
353
354                 if (e->item->flags & UNINTERESTING)
355                         continue;
356                 if (dwim_ref(e->name, strlen(e->name), &oid, &ref) != 1)
357                         goto skip_write_ref;
358                 if (read_ref_full(e->name, RESOLVE_REF_READING, &oid, &flag))
359                         flag = 0;
360                 display_ref = (flag & REF_ISSYMREF) ? e->name : ref;
361
362                 if (e->item->type == OBJ_TAG &&
363                                 !is_tag_in_date_range(e->item, revs)) {
364                         e->item->flags |= UNINTERESTING;
365                         goto skip_write_ref;
366                 }
367
368                 /*
369                  * Make sure the refs we wrote out is correct; --max-count and
370                  * other limiting options could have prevented all the tips
371                  * from getting output.
372                  *
373                  * Non commit objects such as tags and blobs do not have
374                  * this issue as they are not affected by those extra
375                  * constraints.
376                  */
377                 if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
378                         warning(_("ref '%s' is excluded by the rev-list options"),
379                                 e->name);
380                         goto skip_write_ref;
381                 }
382                 /*
383                  * If you run "git bundle create bndl v1.0..v2.0", the
384                  * name of the positive ref is "v2.0" but that is the
385                  * commit that is referenced by the tag, and not the tag
386                  * itself.
387                  */
388                 if (!oideq(&oid, &e->item->oid)) {
389                         /*
390                          * Is this the positive end of a range expressed
391                          * in terms of a tag (e.g. v2.0 from the range
392                          * "v1.0..v2.0")?
393                          */
394                         struct commit *one = lookup_commit_reference(revs->repo, &oid);
395                         struct object *obj;
396
397                         if (e->item == &(one->object)) {
398                                 /*
399                                  * Need to include e->name as an
400                                  * independent ref to the pack-objects
401                                  * input, so that the tag is included
402                                  * in the output; otherwise we would
403                                  * end up triggering "empty bundle"
404                                  * error.
405                                  */
406                                 obj = parse_object_or_die(&oid, e->name);
407                                 obj->flags |= SHOWN;
408                                 add_pending_object(revs, obj, e->name);
409                         }
410                         goto skip_write_ref;
411                 }
412
413                 ref_count++;
414                 write_or_die(bundle_fd, oid_to_hex(&e->item->oid), 40);
415                 write_or_die(bundle_fd, " ", 1);
416                 write_or_die(bundle_fd, display_ref, strlen(display_ref));
417                 write_or_die(bundle_fd, "\n", 1);
418  skip_write_ref:
419                 free(ref);
420         }
421
422         /* end header */
423         write_or_die(bundle_fd, "\n", 1);
424         return ref_count;
425 }
426
427 int create_bundle(struct repository *r, struct bundle_header *header,
428                   const char *path, int argc, const char **argv)
429 {
430         struct lock_file lock = LOCK_INIT;
431         int bundle_fd = -1;
432         int bundle_to_stdout;
433         int ref_count = 0;
434         struct rev_info revs;
435
436         bundle_to_stdout = !strcmp(path, "-");
437         if (bundle_to_stdout)
438                 bundle_fd = 1;
439         else
440                 bundle_fd = hold_lock_file_for_update(&lock, path,
441                                                       LOCK_DIE_ON_ERROR);
442
443         /* write signature */
444         write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
445
446         /* init revs to list objects for pack-objects later */
447         save_commit_buffer = 0;
448         repo_init_revisions(r, &revs, NULL);
449
450         /* write prerequisites */
451         if (compute_and_write_prerequisites(bundle_fd, &revs, argc, argv))
452                 goto err;
453
454         argc = setup_revisions(argc, argv, &revs, NULL);
455
456         if (argc > 1) {
457                 error(_("unrecognized argument: %s"), argv[1]);
458                 goto err;
459         }
460
461         object_array_remove_duplicates(&revs.pending);
462
463         ref_count = write_bundle_refs(bundle_fd, &revs);
464         if (!ref_count)
465                 die(_("Refusing to create empty bundle."));
466         else if (ref_count < 0)
467                 goto err;
468
469         /* write pack */
470         if (write_pack_data(bundle_fd, &revs))
471                 goto err;
472
473         if (!bundle_to_stdout) {
474                 if (commit_lock_file(&lock))
475                         die_errno(_("cannot create '%s'"), path);
476         }
477         return 0;
478 err:
479         rollback_lock_file(&lock);
480         return -1;
481 }
482
483 int unbundle(struct repository *r, struct bundle_header *header,
484              int bundle_fd, int flags)
485 {
486         const char *argv_index_pack[] = {"index-pack",
487                                          "--fix-thin", "--stdin", NULL, NULL};
488         struct child_process ip = CHILD_PROCESS_INIT;
489
490         if (flags & BUNDLE_VERBOSE)
491                 argv_index_pack[3] = "-v";
492
493         if (verify_bundle(r, header, 0))
494                 return -1;
495         ip.argv = argv_index_pack;
496         ip.in = bundle_fd;
497         ip.no_stdout = 1;
498         ip.git_cmd = 1;
499         if (run_command(&ip))
500                 return error(_("index-pack died"));
501         return 0;
502 }