git-fetch-script: fix http:// breakage
[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
LT
7static const char *exec = "git-receive-pack";
8
e4b5c7ff
LT
9struct ref {
10 struct ref *next;
11 unsigned char old_sha1[20];
12 unsigned char new_sha1[20];
13 char name[0];
14};
15
584c6cc9
LT
16static int is_zero_sha1(const unsigned char *sha1)
17{
18 int i;
19
20 for (i = 0; i < 20; i++) {
21 if (*sha1++)
22 return 0;
23 }
24 return 1;
25}
26
94fdb7aa
LT
27static void exec_pack_objects(void)
28{
29 static char *args[] = {
30 "git-pack-objects",
31 "--stdout",
32 NULL
33 };
34 execvp("git-pack-objects", args);
35 die("git-pack-objects exec failed (%s)", strerror(errno));
36}
37
38static void exec_rev_list(struct ref *refs)
39{
40 static char *args[1000];
41 int i = 0;
42
43 args[i++] = "git-rev-list"; /* 0 */
44 args[i++] = "--objects"; /* 1 */
45 while (refs) {
46 char *buf = malloc(100);
47 if (i > 900)
48 die("git-rev-list environment overflow");
584c6cc9
LT
49 if (!is_zero_sha1(refs->old_sha1)) {
50 args[i++] = buf;
51 snprintf(buf, 50, "^%s", sha1_to_hex(refs->old_sha1));
52 buf += 50;
53 }
54 if (!is_zero_sha1(refs->new_sha1)) {
55 args[i++] = buf;
56 snprintf(buf, 50, "%s", sha1_to_hex(refs->new_sha1));
57 }
94fdb7aa
LT
58 refs = refs->next;
59 }
60 args[i] = NULL;
61 execvp("git-rev-list", args);
62 die("git-rev-list exec failed (%s)", strerror(errno));
63}
64
65static void rev_list(int fd, struct ref *refs)
66{
67 int pipe_fd[2];
68 pid_t pack_objects_pid;
69
70 if (pipe(pipe_fd) < 0)
71 die("rev-list setup: pipe failed");
72 pack_objects_pid = fork();
73 if (!pack_objects_pid) {
74 dup2(pipe_fd[0], 0);
75 dup2(fd, 1);
76 close(pipe_fd[0]);
77 close(pipe_fd[1]);
78 close(fd);
79 exec_pack_objects();
80 die("pack-objects setup failed");
81 }
82 if (pack_objects_pid < 0)
83 die("pack-objects fork failed");
84 dup2(pipe_fd[1], 1);
85 close(pipe_fd[0]);
86 close(pipe_fd[1]);
87 close(fd);
88 exec_rev_list(refs);
89}
90
91static int pack_objects(int fd, struct ref *refs)
92{
93 pid_t rev_list_pid;
94
95 rev_list_pid = fork();
96 if (!rev_list_pid) {
97 rev_list(fd, refs);
98 die("rev-list setup failed");
99 }
100 if (rev_list_pid < 0)
101 die("rev-list fork failed");
102 /*
103 * We don't wait for the rev-list pipeline in the parent:
104 * we end up waiting for the other end instead
105 */
7ec4e608 106 return 0;
94fdb7aa 107}
e4b5c7ff
LT
108
109static int read_ref(const char *ref, unsigned char *sha1)
110{
111 int fd, ret;
e4b5c7ff 112 char buffer[60];
e4b5c7ff 113
723c31fe 114 fd = open(git_path("%s", ref), O_RDONLY);
e4b5c7ff
LT
115 if (fd < 0)
116 return -1;
117 ret = -1;
118 if (read(fd, buffer, sizeof(buffer)) >= 40)
119 ret = get_sha1_hex(buffer, sha1);
120 close(fd);
121 return ret;
122}
123
584c6cc9
LT
124static int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
125{
126 if (!has_sha1_file(old_sha1))
127 return 0;
128 /*
129 * FIXME! It is not correct to say that the new one is newer
130 * just because we don't have the old one!
131 *
132 * We should really see if we can reach the old_sha1 commit
133 * from the new_sha1 one.
134 */
135 return 1;
136}
137
138static int local_ref_nr_match;
139static char **local_ref_match;
140static struct ref **local_ref_list;
141
142static int try_to_match(const char *refname, const unsigned char *sha1)
143{
144 struct ref *ref;
145 int len;
146
147 if (!path_match(refname, local_ref_nr_match, local_ref_match))
148 return 0;
149
150 len = strlen(refname)+1;
151 ref = xmalloc(sizeof(*ref) + len);
152 memset(ref->old_sha1, 0, 20);
153 memcpy(ref->new_sha1, sha1, 20);
154 memcpy(ref->name, refname, len);
155 ref->next = NULL;
156 *local_ref_list = ref;
157 local_ref_list = &ref->next;
158 return 0;
159}
160
d0efc8a7 161static int send_pack(int in, int out, int nr_match, char **match)
61221472 162{
94fdb7aa 163 struct ref *ref_list = NULL, **last_ref = &ref_list;
7f8e9828 164 struct ref *ref;
584c6cc9 165 int new_refs;
7f8e9828 166
584c6cc9
LT
167 /*
168 * Read all the refs from the other end
169 */
61221472 170 for (;;) {
e4b5c7ff 171 unsigned char old_sha1[20];
61221472 172 static char buffer[1000];
e4b5c7ff 173 char *name;
f3a3214e
LT
174 int len;
175
176 len = packet_read_line(in, buffer, sizeof(buffer));
e4b5c7ff
LT
177 if (!len)
178 break;
179 if (buffer[len-1] == '\n')
180 buffer[--len] = 0;
181
182 if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
183 die("protocol error: expected sha/ref, got '%s'", buffer);
184 name = buffer + 41;
584c6cc9
LT
185 ref = xmalloc(sizeof(*ref) + len - 40);
186 memcpy(ref->old_sha1, old_sha1, 20);
187 memset(ref->new_sha1, 0, 20);
188 memcpy(ref->name, buffer + 41, len - 40);
189 ref->next = NULL;
190 *last_ref = ref;
191 last_ref = &ref->next;
192 }
193
194 /*
195 * Go through the refs, see if we want to update
196 * any of them..
197 */
198 for (ref = ref_list; ref; ref = ref->next) {
199 unsigned char new_sha1[20];
200 char *name = ref->name;
201
d0efc8a7
LT
202 if (nr_match && !path_match(name, nr_match, match))
203 continue;
584c6cc9 204
7f8e9828 205 if (read_ref(name, new_sha1) < 0)
584c6cc9
LT
206 continue;
207
584c6cc9 208 if (!memcmp(ref->old_sha1, new_sha1, 20)) {
e4b5c7ff 209 fprintf(stderr, "'%s' unchanged\n", name);
7f8e9828 210 continue;
e4b5c7ff 211 }
584c6cc9
LT
212
213 if (!ref_newer(new_sha1, ref->old_sha1)) {
214 error("remote '%s' points to object I don't have", name);
215 continue;
216 }
217
218 /* Ok, mark it for update */
7f8e9828 219 memcpy(ref->new_sha1, new_sha1, 20);
7f8e9828
LT
220 }
221
584c6cc9
LT
222 /*
223 * See if we have any refs that the other end didn't have
224 */
225 if (nr_match) {
226 local_ref_nr_match = nr_match;
227 local_ref_match = match;
228 local_ref_list = last_ref;
229 for_each_ref(try_to_match);
230 }
231
232 /*
233 * Finally, tell the other end!
234 */
235 new_refs = 0;
7f8e9828
LT
236 for (ref = ref_list; ref; ref = ref->next) {
237 char old_hex[60], *new_hex;
584c6cc9
LT
238 if (is_zero_sha1(ref->new_sha1))
239 continue;
240 new_refs++;
7f8e9828
LT
241 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
242 new_hex = sha1_to_hex(ref->new_sha1);
243 packet_write(out, "%s %s %s", old_hex, new_hex, ref->name);
244 fprintf(stderr, "'%s': updating from %s to %s\n", ref->name, old_hex, new_hex);
61221472 245 }
7f8e9828 246
f3a3214e 247 packet_flush(out);
584c6cc9 248 if (new_refs)
94fdb7aa 249 pack_objects(out, ref_list);
61221472
LT
250 close(out);
251 return 0;
252}
253
61221472
LT
254int main(int argc, char **argv)
255{
256 int i, nr_heads = 0;
257 char *dest = NULL;
258 char **heads = NULL;
7f8e9828
LT
259 int fd[2], ret;
260 pid_t pid;
61221472
LT
261
262 argv++;
263 for (i = 1; i < argc; i++) {
264 char *arg = *argv++;
265
266 if (*arg == '-') {
267 if (!strncmp(arg, "--exec=", 7)) {
268 exec = arg + 7;
269 continue;
270 }
271 usage(send_pack_usage);
272 }
273 dest = arg;
274 heads = argv;
275 nr_heads = argc - i -1;
276 break;
277 }
278 if (!dest)
279 usage(send_pack_usage);
f7192598 280 pid = git_connect(fd, dest, exec);
7f8e9828 281 if (pid < 0)
61221472 282 return 1;
d0efc8a7 283 ret = send_pack(fd[0], fd[1], nr_heads, heads);
7f8e9828
LT
284 close(fd[0]);
285 close(fd[1]);
f7192598 286 finish_connect(pid);
7f8e9828 287 return ret;
61221472 288}