demonstrate breakage of detached checkout with symbolic link HEAD
[git/git.git] / bundle.c
CommitLineData
30415d50
JS
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"
fa303836 9#include "refs.h"
30415d50
JS
10
11static const char bundle_signature[] = "# v2 git bundle\n";
12
13static void add_to_ref_list(const unsigned char *sha1, const char *name,
14 struct ref_list *list)
15{
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++;
24}
25
26/* returns an fd */
f3fa1838
JH
27int read_bundle_header(const char *path, struct bundle_header *header)
28{
30415d50
JS
29 char buffer[1024];
30 int fd;
31 long fpos;
32 FILE *ffd = fopen(path, "rb");
33
34 if (!ffd)
35 return error("could not open '%s'", path);
36 if (!fgets(buffer, sizeof(buffer), ffd) ||
37 strcmp(buffer, bundle_signature)) {
38 fclose(ffd);
39 return error("'%s' does not look like a v2 bundle file", path);
40 }
41 while (fgets(buffer, sizeof(buffer), ffd)
42 && buffer[0] != '\n') {
43 int is_prereq = buffer[0] == '-';
44 int offset = is_prereq ? 1 : 0;
45 int len = strlen(buffer);
46 unsigned char sha1[20];
47 struct ref_list *list = is_prereq ? &header->prerequisites
48 : &header->references;
49 char delim;
50
872c930d 51 if (len && buffer[len - 1] == '\n')
30415d50
JS
52 buffer[len - 1] = '\0';
53 if (get_sha1_hex(buffer + offset, sha1)) {
54 warning("unrecognized header: %s", buffer);
55 continue;
56 }
57 delim = buffer[40 + offset];
58 if (!isspace(delim) && (delim != '\0' || !is_prereq))
59 die ("invalid header: %s", buffer);
60 add_to_ref_list(sha1, isspace(delim) ?
61 buffer + 41 + offset : "", list);
62 }
63 fpos = ftell(ffd);
64 fclose(ffd);
65 fd = open(path, O_RDONLY);
66 if (fd < 0)
67 return error("could not open '%s'", path);
68 lseek(fd, fpos, SEEK_SET);
69 return fd;
70}
71
72static int list_refs(struct ref_list *r, int argc, const char **argv)
73{
74 int i;
75
76 for (i = 0; i < r->nr; i++) {
77 if (argc > 1) {
78 int j;
79 for (j = 1; j < argc; j++)
80 if (!strcmp(r->list[i].name, argv[j]))
81 break;
82 if (j == argc)
83 continue;
84 }
85 printf("%s %s\n", sha1_to_hex(r->list[i].sha1),
86 r->list[i].name);
87 }
88 return 0;
89}
90
91#define PREREQ_MARK (1u<<16)
92
93int verify_bundle(struct bundle_header *header, int verbose)
94{
95 /*
96 * Do fast check, then if any prereqs are missing then go line by line
97 * to be verbose about the errors
98 */
99 struct ref_list *p = &header->prerequisites;
100 struct rev_info revs;
101 const char *argv[] = {NULL, "--all"};
102 struct object_array refs;
103 struct commit *commit;
104 int i, ret = 0, req_nr;
105 const char *message = "Repository lacks these prerequisite commits:";
106
107 init_revisions(&revs, NULL);
108 for (i = 0; i < p->nr; i++) {
109 struct ref_list_entry *e = p->list + i;
110 struct object *o = parse_object(e->sha1);
111 if (o) {
112 o->flags |= PREREQ_MARK;
113 add_pending_object(&revs, o, e->name);
114 continue;
115 }
116 if (++ret == 1)
117 error(message);
118 error("%s %s", sha1_to_hex(e->sha1), e->name);
119 }
120 if (revs.pending.nr != p->nr)
121 return ret;
122 req_nr = revs.pending.nr;
123 setup_revisions(2, argv, &revs, NULL);
124
125 memset(&refs, 0, sizeof(struct object_array));
126 for (i = 0; i < revs.pending.nr; i++) {
127 struct object_array_entry *e = revs.pending.objects + i;
128 add_object_array(e->item, e->name, &refs);
129 }
130
3d51e1b5
MK
131 if (prepare_revision_walk(&revs))
132 die("revision walk setup failed");
30415d50
JS
133
134 i = req_nr;
135 while (i && (commit = get_revision(&revs)))
136 if (commit->object.flags & PREREQ_MARK)
137 i--;
138
139 for (i = 0; i < req_nr; i++)
140 if (!(refs.objects[i].item->flags & SHOWN)) {
141 if (++ret == 1)
142 error(message);
143 error("%s %s", sha1_to_hex(refs.objects[i].item->sha1),
144 refs.objects[i].name);
145 }
146
147 for (i = 0; i < refs.nr; i++)
148 clear_commit_marks((struct commit *)refs.objects[i].item, -1);
149
150 if (verbose) {
151 struct ref_list *r;
152
153 r = &header->references;
154 printf("The bundle contains %d ref%s\n",
155 r->nr, (1 < r->nr) ? "s" : "");
156 list_refs(r, 0, NULL);
157 r = &header->prerequisites;
158 printf("The bundle requires these %d ref%s\n",
159 r->nr, (1 < r->nr) ? "s" : "");
160 list_refs(r, 0, NULL);
161 }
162 return ret;
163}
164
165int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
166{
167 return list_refs(&header->references, argc, argv);
168}
169
170int create_bundle(struct bundle_header *header, const char *path,
171 int argc, const char **argv)
172{
173 static struct lock_file lock;
174 int bundle_fd = -1;
175 int bundle_to_stdout;
176 const char **argv_boundary = xmalloc((argc + 4) * sizeof(const char *));
177 const char **argv_pack = xmalloc(5 * sizeof(const char *));
178 int i, ref_count = 0;
179 char buffer[1024];
180 struct rev_info revs;
22568f0a 181 int read_from_stdin = 0;
30415d50
JS
182 struct child_process rls;
183 FILE *rls_fout;
184
185 bundle_to_stdout = !strcmp(path, "-");
186 if (bundle_to_stdout)
187 bundle_fd = 1;
188 else
189 bundle_fd = hold_lock_file_for_update(&lock, path, 1);
190
191 /* write signature */
192 write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
193
194 /* init revs to list objects for pack-objects later */
195 save_commit_buffer = 0;
196 init_revisions(&revs, NULL);
197
198 /* write prerequisites */
199 memcpy(argv_boundary + 3, argv + 1, argc * sizeof(const char *));
200 argv_boundary[0] = "rev-list";
201 argv_boundary[1] = "--boundary";
202 argv_boundary[2] = "--pretty=oneline";
203 argv_boundary[argc + 2] = NULL;
204 memset(&rls, 0, sizeof(rls));
205 rls.argv = argv_boundary;
206 rls.out = -1;
207 rls.git_cmd = 1;
208 if (start_command(&rls))
209 return -1;
210 rls_fout = fdopen(rls.out, "r");
211 while (fgets(buffer, sizeof(buffer), rls_fout)) {
212 unsigned char sha1[20];
213 if (buffer[0] == '-') {
214 write_or_die(bundle_fd, buffer, strlen(buffer));
215 if (!get_sha1_hex(buffer + 1, sha1)) {
216 struct object *object = parse_object(sha1);
217 object->flags |= UNINTERESTING;
218 add_pending_object(&revs, object, buffer);
219 }
220 } else if (!get_sha1_hex(buffer, sha1)) {
221 struct object *object = parse_object(sha1);
222 object->flags |= SHOWN;
223 }
224 }
225 fclose(rls_fout);
226 if (finish_command(&rls))
227 return error("rev-list died");
228
229 /* write references */
230 argc = setup_revisions(argc, argv, &revs, NULL);
22568f0a
AB
231
232 for (i = 1; i < argc; i++) {
233 if (!strcmp(argv[i], "--stdin")) {
234 if (read_from_stdin++)
235 die("--stdin given twice?");
236 read_revisions_from_stdin(&revs);
237 continue;
238 }
239 return error("unrecognized argument: %s'", argv[i]);
240 }
30415d50
JS
241
242 for (i = 0; i < revs.pending.nr; i++) {
243 struct object_array_entry *e = revs.pending.objects + i;
244 unsigned char sha1[20];
245 char *ref;
fa303836
JH
246 const char *display_ref;
247 int flag;
30415d50
JS
248
249 if (e->item->flags & UNINTERESTING)
250 continue;
251 if (dwim_ref(e->name, strlen(e->name), sha1, &ref) != 1)
252 continue;
fa303836
JH
253 if (!resolve_ref(e->name, sha1, 1, &flag))
254 flag = 0;
255 display_ref = (flag & REF_ISSYMREF) ? e->name : ref;
256
30415d50
JS
257 /*
258 * Make sure the refs we wrote out is correct; --max-count and
259 * other limiting options could have prevented all the tips
260 * from getting output.
261 *
262 * Non commit objects such as tags and blobs do not have
263 * this issue as they are not affected by those extra
264 * constraints.
265 */
266 if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
267 warning("ref '%s' is excluded by the rev-list options",
268 e->name);
269 free(ref);
270 continue;
271 }
272 /*
273 * If you run "git bundle create bndl v1.0..v2.0", the
274 * name of the positive ref is "v2.0" but that is the
275 * commit that is referenced by the tag, and not the tag
276 * itself.
277 */
278 if (hashcmp(sha1, e->item->sha1)) {
279 /*
280 * Is this the positive end of a range expressed
281 * in terms of a tag (e.g. v2.0 from the range
282 * "v1.0..v2.0")?
283 */
284 struct commit *one = lookup_commit_reference(sha1);
285 struct object *obj;
286
287 if (e->item == &(one->object)) {
288 /*
289 * Need to include e->name as an
290 * independent ref to the pack-objects
291 * input, so that the tag is included
292 * in the output; otherwise we would
293 * end up triggering "empty bundle"
294 * error.
295 */
296 obj = parse_object(sha1);
297 obj->flags |= SHOWN;
298 add_pending_object(&revs, obj, e->name);
299 }
300 free(ref);
301 continue;
302 }
303
304 ref_count++;
305 write_or_die(bundle_fd, sha1_to_hex(e->item->sha1), 40);
306 write_or_die(bundle_fd, " ", 1);
fa303836 307 write_or_die(bundle_fd, display_ref, strlen(display_ref));
30415d50
JS
308 write_or_die(bundle_fd, "\n", 1);
309 free(ref);
310 }
311 if (!ref_count)
312 die ("Refusing to create empty bundle.");
313
314 /* end header */
315 write_or_die(bundle_fd, "\n", 1);
316
317 /* write pack */
318 argv_pack[0] = "pack-objects";
319 argv_pack[1] = "--all-progress";
320 argv_pack[2] = "--stdout";
321 argv_pack[3] = "--thin";
322 argv_pack[4] = NULL;
323 memset(&rls, 0, sizeof(rls));
324 rls.argv = argv_pack;
325 rls.in = -1;
326 rls.out = bundle_fd;
327 rls.git_cmd = 1;
328 if (start_command(&rls))
329 return error("Could not spawn pack-objects");
4ed7cd3a
BC
330
331 /*
332 * start_command closed bundle_fd if it was > 1
333 * so set the lock fd to -1 so commit_lock_file()
334 * won't fail trying to close it.
335 */
336 lock.fd = -1;
337
30415d50
JS
338 for (i = 0; i < revs.pending.nr; i++) {
339 struct object *object = revs.pending.objects[i].item;
340 if (object->flags & UNINTERESTING)
95693d45
JM
341 write_or_die(rls.in, "^", 1);
342 write_or_die(rls.in, sha1_to_hex(object->sha1), 40);
343 write_or_die(rls.in, "\n", 1);
30415d50 344 }
e72ae288 345 close(rls.in);
30415d50
JS
346 if (finish_command(&rls))
347 return error ("pack-objects died");
c20181e3
JS
348 if (!bundle_to_stdout)
349 commit_lock_file(&lock);
350 return 0;
30415d50
JS
351}
352
353int unbundle(struct bundle_header *header, int bundle_fd)
354{
355 const char *argv_index_pack[] = {"index-pack",
356 "--fix-thin", "--stdin", NULL};
357 struct child_process ip;
358
359 if (verify_bundle(header, 0))
360 return -1;
361 memset(&ip, 0, sizeof(ip));
362 ip.argv = argv_index_pack;
363 ip.in = bundle_fd;
364 ip.no_stdout = 1;
365 ip.git_cmd = 1;
366 if (run_command(&ip))
367 return error("index-pack died");
368 return 0;
369}