fetch-pack: -k option to keep downloaded pack.
[git/git.git] / fetch-pack.c
CommitLineData
def88e9a 1#include "cache.h"
fb9040cc 2#include "refs.h"
def88e9a 3#include "pkt-line.h"
49bb805e
JH
4#include "commit.h"
5#include "tag.h"
def88e9a 6
ad897215 7static int keep_pack;
8b3d9dc0 8static int quiet;
33b83034
JH
9static int verbose;
10static const char fetch_pack_usage[] =
ad897215 11"git-fetch-pack [-q] [-v] [-k] [--exec=upload-pack] [host:]directory <refs>...";
def88e9a
LT
12static const char *exec = "git-upload-pack";
13
0a8944dd 14#define COMPLETE (1U << 0)
23d61f83
JS
15#define COMMON (1U << 1)
16#define COMMON_REF (1U << 2)
17#define SEEN (1U << 3)
18#define POPPED (1U << 4)
19
20static struct commit_list *rev_list = NULL;
c4c86f07 21static int non_common_revs = 0, multi_ack = 0;
23d61f83
JS
22
23static void rev_list_push(struct commit *commit, int mark)
24{
25 if (!(commit->object.flags & mark)) {
26 commit->object.flags |= mark;
27
28 if (!(commit->object.parsed))
29 parse_commit(commit);
30
31 insert_by_date(commit, &rev_list);
32
33 if (!(commit->object.flags & COMMON))
34 non_common_revs++;
35 }
36}
37
38static int rev_list_insert_ref(const char *path, const unsigned char *sha1)
39{
9534f40b 40 struct object *o = deref_tag(parse_object(sha1), path, 0);
23d61f83 41
9534f40b 42 if (o && o->type == commit_type)
23d61f83
JS
43 rev_list_push((struct commit *)o, SEEN);
44
45 return 0;
46}
47
48/*
49 This function marks a rev and its ancestors as common.
50 In some cases, it is desirable to mark only the ancestors (for example
51 when only the server does not yet know that they are common).
52*/
53
54static void mark_common(struct commit *commit,
55 int ancestors_only, int dont_parse)
56{
57 if (commit != NULL && !(commit->object.flags & COMMON)) {
58 struct object *o = (struct object *)commit;
59
60 if (!ancestors_only)
61 o->flags |= COMMON;
62
63 if (!(o->flags & SEEN))
64 rev_list_push(commit, SEEN);
65 else {
66 struct commit_list *parents;
67
68 if (!ancestors_only && !(o->flags & POPPED))
69 non_common_revs--;
70 if (!o->parsed && !dont_parse)
71 parse_commit(commit);
72
73 for (parents = commit->parents;
74 parents;
75 parents = parents->next)
76 mark_common(parents->item, 0, dont_parse);
77 }
78 }
79}
80
81/*
82 Get the next rev to send, ignoring the common.
83*/
84
85static const unsigned char* get_rev()
86{
87 struct commit *commit = NULL;
88
89 while (commit == NULL) {
90 unsigned int mark;
91 struct commit_list* parents;
92
93 if (rev_list == NULL || non_common_revs == 0)
94 return NULL;
95
96 commit = rev_list->item;
97 if (!(commit->object.parsed))
98 parse_commit(commit);
99 commit->object.flags |= POPPED;
100 if (!(commit->object.flags & COMMON))
101 non_common_revs--;
102
103 parents = commit->parents;
104
105 if (commit->object.flags & COMMON) {
106 /* do not send "have", and ignore ancestors */
107 commit = NULL;
108 mark = COMMON | SEEN;
109 } else if (commit->object.flags & COMMON_REF)
110 /* send "have", and ignore ancestors */
111 mark = COMMON | SEEN;
112 else
113 /* send "have", also for its ancestors */
114 mark = SEEN;
115
116 while (parents) {
117 if (!(parents->item->object.flags & SEEN))
118 rev_list_push(parents->item, mark);
119 if (mark & COMMON)
120 mark_common(parents->item, 1, 0);
121 parents = parents->next;
122 }
123
124 rev_list = rev_list->next;
125 }
126
127 return commit->object.sha1;
128}
0a8944dd 129
33b83034
JH
130static int find_common(int fd[2], unsigned char *result_sha1,
131 struct ref *refs)
def88e9a 132{
2759cbc7 133 int fetching;
23d61f83
JS
134 int count = 0, flushes = 0, retval;
135 const unsigned char *sha1;
136
137 for_each_ref(rev_list_insert_ref);
def88e9a 138
2759cbc7
LT
139 fetching = 0;
140 for ( ; refs ; refs = refs->next) {
33b83034 141 unsigned char *remote = refs->old_sha1;
4dab94d5 142 struct object *o;
2759cbc7 143
0a8944dd 144 /*
4dab94d5
JH
145 * If that object is complete (i.e. it is an ancestor of a
146 * local ref), we tell them we have it but do not have to
147 * tell them about its ancestors, which they already know
148 * about.
f1f0a2be
JH
149 *
150 * We use lookup_object here because we are only
151 * interested in the case we *know* the object is
152 * reachable and we have already scanned it.
4dab94d5 153 */
f1f0a2be 154 if (((o = lookup_object(remote)) != NULL) &&
1baaae5e 155 (o->flags & COMPLETE)) {
2759cbc7 156 continue;
0a8944dd 157 }
23d61f83 158
c4c86f07
JS
159 packet_write(fd[1], "want %s%s\n", sha1_to_hex(remote),
160 multi_ack ? " multi_ack" : "");
2759cbc7 161 fetching++;
33b83034 162 }
fb9040cc 163 packet_flush(fd[1]);
2759cbc7
LT
164 if (!fetching)
165 return 1;
0a8944dd 166
23d61f83 167 flushes = 0;
75bfc6c2 168 retval = -1;
23d61f83 169 while ((sha1 = get_rev())) {
def88e9a 170 packet_write(fd[1], "have %s\n", sha1_to_hex(sha1));
33b83034
JH
171 if (verbose)
172 fprintf(stderr, "have %s\n", sha1_to_hex(sha1));
def88e9a 173 if (!(31 & ++count)) {
c4c86f07
JS
174 int ack;
175
def88e9a
LT
176 packet_flush(fd[1]);
177 flushes++;
178
179 /*
180 * We keep one window "ahead" of the other side, and
181 * will wait for an ACK only on the next one
182 */
183 if (count == 32)
184 continue;
c4c86f07
JS
185
186 do {
187 ack = get_ack(fd[0], result_sha1);
188 if (verbose && ack)
189 fprintf(stderr, "got ack %d %s\n", ack,
190 sha1_to_hex(result_sha1));
191 if (ack == 1) {
192 flushes = 0;
193 multi_ack = 0;
194 retval = 0;
195 goto done;
196 } else if (ack == 2) {
197 struct commit *commit =
198 lookup_commit(result_sha1);
199 mark_common(commit, 0, 1);
200 retval = 0;
201 }
202 } while (ack);
def88e9a
LT
203 flushes--;
204 }
205 }
c4c86f07 206done:
75bfc6c2 207 packet_write(fd[1], "done\n");
33b83034
JH
208 if (verbose)
209 fprintf(stderr, "done\n");
c4c86f07
JS
210 if (retval != 0) {
211 multi_ack = 0;
23d61f83 212 flushes++;
c4c86f07
JS
213 }
214 while (flushes || multi_ack) {
215 int ack = get_ack(fd[0], result_sha1);
216 if (ack) {
33b83034 217 if (verbose)
c4c86f07
JS
218 fprintf(stderr, "got ack (%d) %s\n", ack,
219 sha1_to_hex(result_sha1));
220 if (ack == 1)
221 return 0;
222 multi_ack = 1;
223 continue;
33b83034 224 }
c4c86f07 225 flushes--;
def88e9a 226 }
75bfc6c2 227 return retval;
def88e9a
LT
228}
229
49bb805e
JH
230static struct commit_list *complete = NULL;
231
232static int mark_complete(const char *path, const unsigned char *sha1)
233{
234 struct object *o = parse_object(sha1);
235
236 while (o && o->type == tag_type) {
f1f0a2be
JH
237 struct tag *t = (struct tag *) o;
238 if (!t->tagged)
239 break; /* broken repository */
49bb805e 240 o->flags |= COMPLETE;
f1f0a2be 241 o = parse_object(t->tagged->sha1);
49bb805e 242 }
f1f0a2be 243 if (o && o->type == commit_type) {
49bb805e
JH
244 struct commit *commit = (struct commit *)o;
245 commit->object.flags |= COMPLETE;
246 insert_by_date(commit, &complete);
247 }
248 return 0;
249}
250
251static void mark_recent_complete_commits(unsigned long cutoff)
252{
253 while (complete && cutoff <= complete->item->date) {
254 if (verbose)
255 fprintf(stderr, "Marking %s as complete\n",
256 sha1_to_hex(complete->item->object.sha1));
257 pop_most_recent_commit(&complete, COMPLETE);
258 }
259}
260
1baaae5e
JS
261static void filter_refs(struct ref **refs, int nr_match, char **match)
262{
263 struct ref *prev, *current, *next;
264
265 if (!nr_match)
266 return;
267
268 for (prev = NULL, current = *refs; current; current = next) {
269 next = current->next;
270 if ((!memcmp(current->name, "refs/", 5) &&
271 check_ref_format(current->name + 5)) ||
272 !path_match(current->name, nr_match, match)) {
273 if (prev == NULL)
274 *refs = next;
275 else
276 prev->next = next;
277 free(current);
278 } else
279 prev = current;
280 }
281}
282
283static int everything_local(struct ref **refs, int nr_match, char **match)
2759cbc7 284{
49bb805e 285 struct ref *ref;
2759cbc7 286 int retval;
49bb805e
JH
287 unsigned long cutoff = 0;
288
289 track_object_refs = 0;
290 save_commit_buffer = 0;
291
1baaae5e 292 for (ref = *refs; ref; ref = ref->next) {
49bb805e
JH
293 struct object *o;
294
295 o = parse_object(ref->old_sha1);
296 if (!o)
297 continue;
298
299 /* We already have it -- which may mean that we were
300 * in sync with the other side at some time after
301 * that (it is OK if we guess wrong here).
302 */
303 if (o->type == commit_type) {
304 struct commit *commit = (struct commit *)o;
305 if (!cutoff || cutoff < commit->date)
306 cutoff = commit->date;
307 }
308 }
309
310 for_each_ref(mark_complete);
311 if (cutoff)
312 mark_recent_complete_commits(cutoff);
2759cbc7 313
1baaae5e
JS
314 /*
315 * Mark all complete remote refs as common refs.
316 * Don't mark them common yet; the server has to be told so first.
317 */
318 for (ref = *refs; ref; ref = ref->next) {
9534f40b
JH
319 struct object *o = deref_tag(lookup_object(ref->old_sha1),
320 NULL, 0);
1baaae5e
JS
321
322 if (!o || o->type != commit_type || !(o->flags & COMPLETE))
323 continue;
324
325 if (!(o->flags & SEEN)) {
326 rev_list_push((struct commit *)o, COMMON_REF | SEEN);
327
328 mark_common((struct commit *)o, 1, 1);
329 }
330 }
331
332 filter_refs(refs, nr_match, match);
333
334 for (retval = 1, ref = *refs; ref ; ref = ref->next) {
335 const unsigned char *remote = ref->old_sha1;
2759cbc7 336 unsigned char local[20];
49bb805e 337 struct object *o;
2759cbc7 338
1baaae5e 339 o = lookup_object(remote);
49bb805e 340 if (!o || !(o->flags & COMPLETE)) {
2759cbc7
LT
341 retval = 0;
342 if (!verbose)
343 continue;
344 fprintf(stderr,
345 "want %s (%s)\n", sha1_to_hex(remote),
1baaae5e 346 ref->name);
2759cbc7
LT
347 continue;
348 }
349
1baaae5e 350 memcpy(ref->new_sha1, local, 20);
2759cbc7
LT
351 if (!verbose)
352 continue;
353 fprintf(stderr,
354 "already have %s (%s)\n", sha1_to_hex(remote),
1baaae5e 355 ref->name);
2759cbc7
LT
356 }
357 return retval;
358}
359
def88e9a
LT
360static int fetch_pack(int fd[2], int nr_match, char **match)
361{
d1c133f5
LT
362 struct ref *ref;
363 unsigned char sha1[20];
364 int status;
def88e9a 365
1baaae5e 366 get_remote_heads(fd[0], &ref, 0, NULL, 0);
c4c86f07
JS
367 if (server_supports("multi_ack")) {
368 if (verbose)
369 fprintf(stderr, "Server supports multi_ack\n");
370 multi_ack = 1;
371 }
d1c133f5
LT
372 if (!ref) {
373 packet_flush(fd[1]);
374 die("no matching remote head");
375 }
1baaae5e 376 if (everything_local(&ref, nr_match, match)) {
2759cbc7
LT
377 packet_flush(fd[1]);
378 goto all_done;
379 }
33b83034
JH
380 if (find_common(fd, sha1, ref) < 0)
381 fprintf(stderr, "warning: no common commits\n");
ad897215
JH
382
383 if (keep_pack)
384 status = receive_keep_pack(fd, "git-fetch-pack");
385 else
386 status = receive_unpack_pack(fd, "git-fetch-pack", quiet);
387
388 if (status)
389 die("git-fetch-pack: fetch failed.");
390
391 all_done:
392 while (ref) {
393 printf("%s %s\n",
394 sha1_to_hex(ref->old_sha1), ref->name);
395 ref = ref->next;
75bfc6c2 396 }
ad897215 397 return 0;
def88e9a
LT
398}
399
400int main(int argc, char **argv)
401{
402 int i, ret, nr_heads;
403 char *dest = NULL, **heads;
404 int fd[2];
405 pid_t pid;
406
5a327713
JH
407 setup_git_directory();
408
def88e9a
LT
409 nr_heads = 0;
410 heads = NULL;
411 for (i = 1; i < argc; i++) {
412 char *arg = argv[i];
413
414 if (*arg == '-') {
8b3d9dc0
JH
415 if (!strncmp("--exec=", arg, 7)) {
416 exec = arg + 7;
417 continue;
418 }
33b83034
JH
419 if (!strcmp("-q", arg)) {
420 quiet = 1;
421 continue;
422 }
ad897215
JH
423 if (!strcmp("-k", arg)) {
424 keep_pack = 1;
425 continue;
426 }
33b83034
JH
427 if (!strcmp("-v", arg)) {
428 verbose = 1;
429 continue;
430 }
def88e9a
LT
431 usage(fetch_pack_usage);
432 }
433 dest = arg;
434 heads = argv + i + 1;
435 nr_heads = argc - i - 1;
436 break;
437 }
438 if (!dest)
439 usage(fetch_pack_usage);
440 pid = git_connect(fd, dest, exec);
441 if (pid < 0)
442 return 1;
443 ret = fetch_pack(fd, nr_heads, heads);
444 close(fd[0]);
445 close(fd[1]);
446 finish_connect(pid);
9e5d2b40
JH
447
448 if (!ret && nr_heads) {
449 /* If the heads to pull were given, we should have
450 * consumed all of them by matching the remote.
451 * Otherwise, 'git-fetch remote no-such-ref' would
452 * silently succeed without issuing an error.
453 */
454 for (i = 0; i < nr_heads; i++)
455 if (heads[i] && heads[i][0]) {
456 error("no such remote ref %s", heads[i]);
457 ret = 1;
458 }
459 }
460
def88e9a
LT
461 return ret;
462}