Merge master.kernel.org:/pub/scm/gitk/gitk
[git/git.git] / send-pack.c
CommitLineData
61221472 1#include "cache.h"
584c6cc9 2#include "refs.h"
f3a3214e 3#include "pkt-line.h"
61221472 4
2a245013
JH
5static const char send_pack_usage[] =
6"git-send-pack [--exec=git-receive-pack] [host:]directory [heads]*";
61221472 7static const char *exec = "git-receive-pack";
d089391c 8static int send_all = 0;
61221472 9
584c6cc9
LT
10static int is_zero_sha1(const unsigned char *sha1)
11{
12 int i;
13
14 for (i = 0; i < 20; i++) {
15 if (*sha1++)
16 return 0;
17 }
18 return 1;
19}
20
94fdb7aa
LT
21static void exec_pack_objects(void)
22{
23 static char *args[] = {
24 "git-pack-objects",
25 "--stdout",
26 NULL
27 };
28 execvp("git-pack-objects", args);
29 die("git-pack-objects exec failed (%s)", strerror(errno));
30}
31
32static void exec_rev_list(struct ref *refs)
33{
34 static char *args[1000];
35 int i = 0;
36
37 args[i++] = "git-rev-list"; /* 0 */
38 args[i++] = "--objects"; /* 1 */
39 while (refs) {
40 char *buf = malloc(100);
41 if (i > 900)
42 die("git-rev-list environment overflow");
584c6cc9
LT
43 if (!is_zero_sha1(refs->old_sha1)) {
44 args[i++] = buf;
45 snprintf(buf, 50, "^%s", sha1_to_hex(refs->old_sha1));
46 buf += 50;
47 }
48 if (!is_zero_sha1(refs->new_sha1)) {
49 args[i++] = buf;
50 snprintf(buf, 50, "%s", sha1_to_hex(refs->new_sha1));
51 }
94fdb7aa
LT
52 refs = refs->next;
53 }
54 args[i] = NULL;
55 execvp("git-rev-list", args);
56 die("git-rev-list exec failed (%s)", strerror(errno));
57}
58
59static void rev_list(int fd, struct ref *refs)
60{
61 int pipe_fd[2];
62 pid_t pack_objects_pid;
63
64 if (pipe(pipe_fd) < 0)
65 die("rev-list setup: pipe failed");
66 pack_objects_pid = fork();
67 if (!pack_objects_pid) {
68 dup2(pipe_fd[0], 0);
69 dup2(fd, 1);
70 close(pipe_fd[0]);
71 close(pipe_fd[1]);
72 close(fd);
73 exec_pack_objects();
74 die("pack-objects setup failed");
75 }
76 if (pack_objects_pid < 0)
77 die("pack-objects fork failed");
78 dup2(pipe_fd[1], 1);
79 close(pipe_fd[0]);
80 close(pipe_fd[1]);
81 close(fd);
82 exec_rev_list(refs);
83}
84
85static int pack_objects(int fd, struct ref *refs)
86{
87 pid_t rev_list_pid;
88
89 rev_list_pid = fork();
90 if (!rev_list_pid) {
91 rev_list(fd, refs);
92 die("rev-list setup failed");
93 }
94 if (rev_list_pid < 0)
95 die("rev-list fork failed");
96 /*
97 * We don't wait for the rev-list pipeline in the parent:
98 * we end up waiting for the other end instead
99 */
7ec4e608 100 return 0;
94fdb7aa 101}
e4b5c7ff
LT
102
103static int read_ref(const char *ref, unsigned char *sha1)
104{
105 int fd, ret;
e4b5c7ff 106 char buffer[60];
e4b5c7ff 107
723c31fe 108 fd = open(git_path("%s", ref), O_RDONLY);
e4b5c7ff
LT
109 if (fd < 0)
110 return -1;
111 ret = -1;
112 if (read(fd, buffer, sizeof(buffer)) >= 40)
113 ret = get_sha1_hex(buffer, sha1);
114 close(fd);
115 return ret;
116}
117
584c6cc9
LT
118static int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
119{
120 if (!has_sha1_file(old_sha1))
121 return 0;
122 /*
123 * FIXME! It is not correct to say that the new one is newer
124 * just because we don't have the old one!
125 *
126 * We should really see if we can reach the old_sha1 commit
127 * from the new_sha1 one.
128 */
129 return 1;
130}
131
132static int local_ref_nr_match;
133static char **local_ref_match;
d089391c
LT
134static struct ref *local_ref_list;
135static struct ref **local_last_ref;
584c6cc9
LT
136
137static int try_to_match(const char *refname, const unsigned char *sha1)
138{
139 struct ref *ref;
140 int len;
141
d089391c
LT
142 if (!path_match(refname, local_ref_nr_match, local_ref_match)) {
143 if (!send_all)
144 return 0;
145
146 /* If we have it listed already, skip it */
147 for (ref = local_ref_list ; ref ; ref = ref->next) {
148 if (!strcmp(ref->name, refname))
149 return 0;
150 }
151 }
584c6cc9
LT
152
153 len = strlen(refname)+1;
154 ref = xmalloc(sizeof(*ref) + len);
155 memset(ref->old_sha1, 0, 20);
156 memcpy(ref->new_sha1, sha1, 20);
157 memcpy(ref->name, refname, len);
158 ref->next = NULL;
d089391c
LT
159 *local_last_ref = ref;
160 local_last_ref = &ref->next;
584c6cc9
LT
161 return 0;
162}
163
d0efc8a7 164static int send_pack(int in, int out, int nr_match, char **match)
61221472 165{
d1c133f5 166 struct ref *ref_list, **last_ref;
7f8e9828 167 struct ref *ref;
584c6cc9 168 int new_refs;
7f8e9828 169
d1c133f5
LT
170 /* First we get all heads, whether matching or not.. */
171 last_ref = get_remote_heads(in, &ref_list, 0, NULL);
584c6cc9
LT
172
173 /*
174 * Go through the refs, see if we want to update
175 * any of them..
176 */
177 for (ref = ref_list; ref; ref = ref->next) {
178 unsigned char new_sha1[20];
179 char *name = ref->name;
180
d0efc8a7
LT
181 if (nr_match && !path_match(name, nr_match, match))
182 continue;
584c6cc9 183
7f8e9828 184 if (read_ref(name, new_sha1) < 0)
584c6cc9
LT
185 continue;
186
584c6cc9 187 if (!memcmp(ref->old_sha1, new_sha1, 20)) {
e4b5c7ff 188 fprintf(stderr, "'%s' unchanged\n", name);
7f8e9828 189 continue;
e4b5c7ff 190 }
584c6cc9
LT
191
192 if (!ref_newer(new_sha1, ref->old_sha1)) {
193 error("remote '%s' points to object I don't have", name);
194 continue;
195 }
196
197 /* Ok, mark it for update */
7f8e9828 198 memcpy(ref->new_sha1, new_sha1, 20);
7f8e9828
LT
199 }
200
584c6cc9
LT
201 /*
202 * See if we have any refs that the other end didn't have
203 */
204 if (nr_match) {
205 local_ref_nr_match = nr_match;
206 local_ref_match = match;
d089391c
LT
207 local_ref_list = ref_list;
208 local_last_ref = last_ref;
584c6cc9
LT
209 for_each_ref(try_to_match);
210 }
211
212 /*
213 * Finally, tell the other end!
214 */
215 new_refs = 0;
7f8e9828
LT
216 for (ref = ref_list; ref; ref = ref->next) {
217 char old_hex[60], *new_hex;
584c6cc9
LT
218 if (is_zero_sha1(ref->new_sha1))
219 continue;
220 new_refs++;
7f8e9828
LT
221 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
222 new_hex = sha1_to_hex(ref->new_sha1);
223 packet_write(out, "%s %s %s", old_hex, new_hex, ref->name);
224 fprintf(stderr, "'%s': updating from %s to %s\n", ref->name, old_hex, new_hex);
61221472 225 }
7f8e9828 226
f3a3214e 227 packet_flush(out);
584c6cc9 228 if (new_refs)
94fdb7aa 229 pack_objects(out, ref_list);
61221472
LT
230 close(out);
231 return 0;
232}
233
61221472
LT
234int main(int argc, char **argv)
235{
236 int i, nr_heads = 0;
237 char *dest = NULL;
238 char **heads = NULL;
7f8e9828
LT
239 int fd[2], ret;
240 pid_t pid;
61221472
LT
241
242 argv++;
d089391c
LT
243 for (i = 1; i < argc; i++, argv++) {
244 char *arg = *argv;
61221472
LT
245
246 if (*arg == '-') {
247 if (!strncmp(arg, "--exec=", 7)) {
248 exec = arg + 7;
249 continue;
250 }
d089391c
LT
251 if (!strcmp(arg, "--all")) {
252 send_all = 1;
253 continue;
254 }
61221472
LT
255 usage(send_pack_usage);
256 }
d089391c
LT
257 if (!dest) {
258 dest = arg;
259 continue;
260 }
61221472 261 heads = argv;
d089391c 262 nr_heads = argc - i;
61221472
LT
263 break;
264 }
265 if (!dest)
266 usage(send_pack_usage);
f7192598 267 pid = git_connect(fd, dest, exec);
7f8e9828 268 if (pid < 0)
61221472 269 return 1;
d0efc8a7 270 ret = send_pack(fd[0], fd[1], nr_heads, heads);
7f8e9828
LT
271 close(fd[0]);
272 close(fd[1]);
f7192598 273 finish_connect(pid);
7f8e9828 274 return ret;
61221472 275}