t5800: point out that deleting branches does not work
[git/dscho.git] / bundle.c
blob8d31b98f58b9e9bf156615130ec80684f788fcaa
1 #include "cache.h"
2 #include "bundle.h"
3 #include "object.h"
4 #include "commit.h"
5 #include "diff.h"
6 #include "revision.h"
7 #include "list-objects.h"
8 #include "run-command.h"
9 #include "refs.h"
11 static const char bundle_signature[] = "# v2 git bundle\n";
13 static void add_to_ref_list(const unsigned char *sha1, const char *name,
14                 struct ref_list *list)
16         if (list->nr + 1 >= list->alloc) {
17                 list->alloc = alloc_nr(list->nr + 1);
18                 list->list = xrealloc(list->list,
19                                 list->alloc * sizeof(list->list[0]));
20         }
21         memcpy(list->list[list->nr].sha1, sha1, 20);
22         list->list[list->nr].name = xstrdup(name);
23         list->nr++;
26 static int parse_bundle_header(int fd, struct bundle_header *header,
27                                const char *report_path)
29         struct strbuf buf = STRBUF_INIT;
30         int status = 0;
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         }
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                 unsigned char sha1[20];
46                 int is_prereq = 0;
48                 if (*buf.buf == '-') {
49                         is_prereq = 1;
50                         strbuf_remove(&buf, 0, 1);
51                 }
52                 strbuf_rtrim(&buf);
54                 /*
55                  * Tip lines have object name, SP, and refname.
56                  * Prerequisites have object name that is optionally
57                  * followed by SP and subject line.
58                  */
59                 if (get_sha1_hex(buf.buf, sha1) ||
60                     (40 <= buf.len && !isspace(buf.buf[40])) ||
61                     (!is_prereq && buf.len <= 40)) {
62                         if (report_path)
63                                 error(_("unrecognized header: %s%s (%d)"),
64                                       (is_prereq ? "-" : ""), buf.buf, (int)buf.len);
65                         status = -1;
66                         break;
67                 } else {
68                         if (is_prereq)
69                                 add_to_ref_list(sha1, "", &header->prerequisites);
70                         else
71                                 add_to_ref_list(sha1, buf.buf + 41, &header->references);
72                 }
73         }
75  abort:
76         if (status) {
77                 close(fd);
78                 fd = -1;
79         }
80         strbuf_release(&buf);
81         return fd;
84 int read_bundle_header(const char *path, struct bundle_header *header)
86         int fd = open(path, O_RDONLY);
88         if (fd < 0)
89                 return error(_("could not open '%s'"), path);
90         return parse_bundle_header(fd, header, path);
93 int is_bundle(const char *path, int quiet)
95         struct bundle_header header;
96         int fd = open(path, O_RDONLY);
98         if (fd < 0)
99                 return 0;
100         memset(&header, 0, sizeof(header));
101         fd = parse_bundle_header(fd, &header, quiet ? NULL : path);
102         if (fd >= 0)
103                 close(fd);
104         return (fd >= 0);
107 static int list_refs(struct ref_list *r, int argc, const char **argv)
109         int i;
111         for (i = 0; i < r->nr; i++) {
112                 if (argc > 1) {
113                         int j;
114                         for (j = 1; j < argc; j++)
115                                 if (!strcmp(r->list[i].name, argv[j]))
116                                         break;
117                         if (j == argc)
118                                 continue;
119                 }
120                 printf("%s %s\n", sha1_to_hex(r->list[i].sha1),
121                                 r->list[i].name);
122         }
123         return 0;
126 #define PREREQ_MARK (1u<<16)
128 int verify_bundle(struct bundle_header *header, int verbose)
130         /*
131          * Do fast check, then if any prereqs are missing then go line by line
132          * to be verbose about the errors
133          */
134         struct ref_list *p = &header->prerequisites;
135         struct rev_info revs;
136         const char *argv[] = {NULL, "--all", NULL};
137         struct object_array refs;
138         struct commit *commit;
139         int i, ret = 0, req_nr;
140         const char *message = _("Repository lacks these prerequisite commits:");
142         init_revisions(&revs, NULL);
143         for (i = 0; i < p->nr; i++) {
144                 struct ref_list_entry *e = p->list + i;
145                 struct object *o = parse_object(e->sha1);
146                 if (o) {
147                         o->flags |= PREREQ_MARK;
148                         add_pending_object(&revs, o, e->name);
149                         continue;
150                 }
151                 if (++ret == 1)
152                         error("%s", message);
153                 error("%s %s", sha1_to_hex(e->sha1), e->name);
154         }
155         if (revs.pending.nr != p->nr)
156                 return ret;
157         req_nr = revs.pending.nr;
158         setup_revisions(2, argv, &revs, NULL);
160         refs = revs.pending;
161         revs.leak_pending = 1;
163         if (prepare_revision_walk(&revs))
164                 die(_("revision walk setup failed"));
166         i = req_nr;
167         while (i && (commit = get_revision(&revs)))
168                 if (commit->object.flags & PREREQ_MARK)
169                         i--;
171         for (i = 0; i < req_nr; i++)
172                 if (!(refs.objects[i].item->flags & SHOWN)) {
173                         if (++ret == 1)
174                                 error("%s", message);
175                         error("%s %s", sha1_to_hex(refs.objects[i].item->sha1),
176                                 refs.objects[i].name);
177                 }
179         clear_commit_marks_for_object_array(&refs, ALL_REV_FLAGS);
180         free(refs.objects);
182         if (verbose) {
183                 struct ref_list *r;
185                 r = &header->references;
186                 printf_ln(Q_("The bundle contains %d ref",
187                              "The bundle contains %d refs",
188                              r->nr),
189                           r->nr);
190                 list_refs(r, 0, NULL);
191                 r = &header->prerequisites;
192                 printf_ln(Q_("The bundle requires this ref",
193                              "The bundle requires these %d refs",
194                              r->nr),
195                           r->nr);
196                 list_refs(r, 0, NULL);
197         }
198         return ret;
201 int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
203         return list_refs(&header->references, argc, argv);
206 static int is_tag_in_date_range(struct object *tag, struct rev_info *revs)
208         unsigned long size;
209         enum object_type type;
210         char *buf, *line, *lineend;
211         unsigned long date;
213         if (revs->max_age == -1 && revs->min_age == -1)
214                 return 1;
216         buf = read_sha1_file(tag->sha1, &type, &size);
217         if (!buf)
218                 return 1;
219         line = memmem(buf, size, "\ntagger ", 8);
220         if (!line++)
221                 return 1;
222         lineend = memchr(line, buf + size - line, '\n');
223         line = memchr(line, lineend ? lineend - line : buf + size - line, '>');
224         if (!line++)
225                 return 1;
226         date = strtoul(line, NULL, 10);
227         free(buf);
228         return (revs->max_age == -1 || revs->max_age < date) &&
229                 (revs->min_age == -1 || revs->min_age > date);
232 int create_bundle(struct bundle_header *header, const char *path,
233                 int argc, const char **argv)
235         static struct lock_file lock;
236         int bundle_fd = -1;
237         int bundle_to_stdout;
238         const char **argv_boundary = xmalloc((argc + 4) * sizeof(const char *));
239         const char **argv_pack = xmalloc(6 * sizeof(const char *));
240         int i, ref_count = 0;
241         struct strbuf buf = STRBUF_INIT;
242         struct rev_info revs;
243         struct child_process rls;
244         FILE *rls_fout;
246         bundle_to_stdout = !strcmp(path, "-");
247         if (bundle_to_stdout)
248                 bundle_fd = 1;
249         else
250                 bundle_fd = hold_lock_file_for_update(&lock, path,
251                                                       LOCK_DIE_ON_ERROR);
253         /* write signature */
254         write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
256         /* init revs to list objects for pack-objects later */
257         save_commit_buffer = 0;
258         init_revisions(&revs, NULL);
260         /* write prerequisites */
261         memcpy(argv_boundary + 3, argv + 1, argc * sizeof(const char *));
262         argv_boundary[0] = "rev-list";
263         argv_boundary[1] = "--boundary";
264         argv_boundary[2] = "--pretty=oneline";
265         argv_boundary[argc + 2] = NULL;
266         memset(&rls, 0, sizeof(rls));
267         rls.argv = argv_boundary;
268         rls.out = -1;
269         rls.git_cmd = 1;
270         if (start_command(&rls))
271                 return -1;
272         rls_fout = xfdopen(rls.out, "r");
273         while (strbuf_getwholeline(&buf, rls_fout, '\n') != EOF) {
274                 unsigned char sha1[20];
275                 if (buf.len > 0 && buf.buf[0] == '-') {
276                         write_or_die(bundle_fd, buf.buf, buf.len);
277                         if (!get_sha1_hex(buf.buf + 1, sha1)) {
278                                 struct object *object = parse_object(sha1);
279                                 object->flags |= UNINTERESTING;
280                                 add_pending_object(&revs, object, xstrdup(buf.buf));
281                         }
282                 } else if (!get_sha1_hex(buf.buf, sha1)) {
283                         struct object *object = parse_object(sha1);
284                         object->flags |= SHOWN;
285                 }
286         }
287         strbuf_release(&buf);
288         fclose(rls_fout);
289         if (finish_command(&rls))
290                 return error(_("rev-list died"));
292         /* write references */
293         argc = setup_revisions(argc, argv, &revs, NULL);
295         if (argc > 1)
296                 return error(_("unrecognized argument: %s"), argv[1]);
298         object_array_remove_duplicates(&revs.pending);
300         for (i = 0; i < revs.pending.nr; i++) {
301                 struct object_array_entry *e = revs.pending.objects + i;
302                 unsigned char sha1[20];
303                 char *ref;
304                 const char *display_ref;
305                 int flag;
307                 if (e->item->flags & UNINTERESTING)
308                         continue;
309                 if (dwim_ref(e->name, strlen(e->name), sha1, &ref) != 1)
310                         continue;
311                 if (read_ref_full(e->name, sha1, 1, &flag))
312                         flag = 0;
313                 display_ref = (flag & REF_ISSYMREF) ? e->name : ref;
315                 if (e->item->type == OBJ_TAG &&
316                                 !is_tag_in_date_range(e->item, &revs)) {
317                         e->item->flags |= UNINTERESTING;
318                         continue;
319                 }
321                 /*
322                  * Make sure the refs we wrote out is correct; --max-count and
323                  * other limiting options could have prevented all the tips
324                  * from getting output.
325                  *
326                  * Non commit objects such as tags and blobs do not have
327                  * this issue as they are not affected by those extra
328                  * constraints.
329                  */
330                 if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
331                         warning(_("ref '%s' is excluded by the rev-list options"),
332                                 e->name);
333                         free(ref);
334                         continue;
335                 }
336                 /*
337                  * If you run "git bundle create bndl v1.0..v2.0", the
338                  * name of the positive ref is "v2.0" but that is the
339                  * commit that is referenced by the tag, and not the tag
340                  * itself.
341                  */
342                 if (hashcmp(sha1, e->item->sha1)) {
343                         /*
344                          * Is this the positive end of a range expressed
345                          * in terms of a tag (e.g. v2.0 from the range
346                          * "v1.0..v2.0")?
347                          */
348                         struct commit *one = lookup_commit_reference(sha1);
349                         struct object *obj;
351                         if (e->item == &(one->object)) {
352                                 /*
353                                  * Need to include e->name as an
354                                  * independent ref to the pack-objects
355                                  * input, so that the tag is included
356                                  * in the output; otherwise we would
357                                  * end up triggering "empty bundle"
358                                  * error.
359                                  */
360                                 obj = parse_object(sha1);
361                                 obj->flags |= SHOWN;
362                                 add_pending_object(&revs, obj, e->name);
363                         }
364                         free(ref);
365                         continue;
366                 }
368                 ref_count++;
369                 write_or_die(bundle_fd, sha1_to_hex(e->item->sha1), 40);
370                 write_or_die(bundle_fd, " ", 1);
371                 write_or_die(bundle_fd, display_ref, strlen(display_ref));
372                 write_or_die(bundle_fd, "\n", 1);
373                 free(ref);
374         }
375         if (!ref_count)
376                 die(_("Refusing to create empty bundle."));
378         /* end header */
379         write_or_die(bundle_fd, "\n", 1);
381         /* write pack */
382         argv_pack[0] = "pack-objects";
383         argv_pack[1] = "--all-progress-implied";
384         argv_pack[2] = "--stdout";
385         argv_pack[3] = "--thin";
386         argv_pack[4] = "--delta-base-offset";
387         argv_pack[5] = NULL;
388         memset(&rls, 0, sizeof(rls));
389         rls.argv = argv_pack;
390         rls.in = -1;
391         rls.out = bundle_fd;
392         rls.git_cmd = 1;
393         if (start_command(&rls))
394                 return error(_("Could not spawn pack-objects"));
396         /*
397          * start_command closed bundle_fd if it was > 1
398          * so set the lock fd to -1 so commit_lock_file()
399          * won't fail trying to close it.
400          */
401         lock.fd = -1;
403         for (i = 0; i < revs.pending.nr; i++) {
404                 struct object *object = revs.pending.objects[i].item;
405                 if (object->flags & UNINTERESTING)
406                         write_or_die(rls.in, "^", 1);
407                 write_or_die(rls.in, sha1_to_hex(object->sha1), 40);
408                 write_or_die(rls.in, "\n", 1);
409         }
410         close(rls.in);
411         if (finish_command(&rls))
412                 return error(_("pack-objects died"));
413         if (!bundle_to_stdout) {
414                 if (commit_lock_file(&lock))
415                         die_errno(_("cannot create '%s'"), path);
416         }
417         return 0;
420 int unbundle(struct bundle_header *header, int bundle_fd, int flags)
422         const char *argv_index_pack[] = {"index-pack",
423                                          "--fix-thin", "--stdin", NULL, NULL};
424         struct child_process ip;
426         if (flags & BUNDLE_VERBOSE)
427                 argv_index_pack[3] = "-v";
429         if (verify_bundle(header, 0))
430                 return -1;
431         memset(&ip, 0, sizeof(ip));
432         ip.argv = argv_index_pack;
433         ip.in = bundle_fd;
434         ip.no_stdout = 1;
435         ip.git_cmd = 1;
436         if (run_command(&ip))
437                 return error(_("index-pack died"));
438         return 0;