1#include "cache.h"
2#include "commit.h"
3#include "refs.h"
4#include "pkt-line.h"
5
6static const char send_pack_usage[] =
7"git-send-pack [--exec=git-receive-pack] [host:]directory [heads]*";
8static const char *exec = "git-receive-pack";
9static int send_all = 0;
10static int force_update = 0;
11
12static int is_zero_sha1(const unsigned char *sha1)
13{
14 int i;
15
16 for (i = 0; i < 20; i++) {
17 if (*sha1++)
18 return 0;
19 }
20 return 1;
21}
22
23static void exec_pack_objects(void)
24{
25 static char *args[] = {
26 "git-pack-objects",
27 "--stdout",
28 NULL
29 };
30 execvp("git-pack-objects", args);
31 die("git-pack-objects exec failed (%s)", strerror(errno));
32}
33
34static void exec_rev_list(struct ref *refs)
35{
36 static char *args[1000];
37 int i = 0;
38
39 args[i++] = "git-rev-list"; /* 0 */
40 args[i++] = "--objects"; /* 1 */
41 while (refs) {
42 char *buf = malloc(100);
43 if (i > 900)
44 die("git-rev-list environment overflow");
45 if (!is_zero_sha1(refs->old_sha1)) {
46 args[i++] = buf;
47 snprintf(buf, 50, "^%s", sha1_to_hex(refs->old_sha1));
48 buf += 50;
49 }
50 if (!is_zero_sha1(refs->new_sha1)) {
51 args[i++] = buf;
52 snprintf(buf, 50, "%s", sha1_to_hex(refs->new_sha1));
53 }
54 refs = refs->next;
55 }
56 args[i] = NULL;
57 execvp("git-rev-list", args);
58 die("git-rev-list exec failed (%s)", strerror(errno));
59}
60
61static void rev_list(int fd, struct ref *refs)
62{
63 int pipe_fd[2];
64 pid_t pack_objects_pid;
65
66 if (pipe(pipe_fd) < 0)
67 die("rev-list setup: pipe failed");
68 pack_objects_pid = fork();
69 if (!pack_objects_pid) {
70 dup2(pipe_fd[0], 0);
71 dup2(fd, 1);
72 close(pipe_fd[0]);
73 close(pipe_fd[1]);
74 close(fd);
75 exec_pack_objects();
76 die("pack-objects setup failed");
77 }
78 if (pack_objects_pid < 0)
79 die("pack-objects fork failed");
80 dup2(pipe_fd[1], 1);
81 close(pipe_fd[0]);
82 close(pipe_fd[1]);
83 close(fd);
84 exec_rev_list(refs);
85}
86
87static int pack_objects(int fd, struct ref *refs)
88{
89 pid_t rev_list_pid;
90
91 rev_list_pid = fork();
92 if (!rev_list_pid) {
93 rev_list(fd, refs);
94 die("rev-list setup failed");
95 }
96 if (rev_list_pid < 0)
97 die("rev-list fork failed");
98 /*
99 * We don't wait for the rev-list pipeline in the parent:
100 * we end up waiting for the other end instead
101 */
102 return 0;
103}
104
105static int read_ref(const char *ref, unsigned char *sha1)
106{
107 int fd, ret;
108 char buffer[60];
109
110 fd = open(git_path("%s", ref), O_RDONLY);
111 if (fd < 0)
112 return -1;
113 ret = -1;
114 if (read(fd, buffer, sizeof(buffer)) >= 40)
115 ret = get_sha1_hex(buffer, sha1);
116 close(fd);
117 return ret;
118}
119
120static int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
121{
122 struct commit *new, *old;
123 struct commit_list *list;
124
125 if (force_update)
126 return 1;
127 old = lookup_commit_reference(old_sha1);
128 if (!old)
129 return 0;
130 new = lookup_commit_reference(new_sha1);
131 if (!new)
132 return 0;
133 if (parse_commit(new) < 0)
134 return 0;
135 list = NULL;
136 commit_list_insert(new, &list);
137 while ((new = pop_most_recent_commit(&list, 1)) != NULL) {
138 if (new == old)
139 return 1;
140 }
141 return 0;
142}
143
144static int local_ref_nr_match;
145static char **local_ref_match;
146static struct ref *local_ref_list;
147static struct ref **local_last_ref;
148
149static int try_to_match(const char *refname, const unsigned char *sha1)
150{
151 struct ref *ref;
152 int len;
153
154 if (!path_match(refname, local_ref_nr_match, local_ref_match)) {
155 if (!send_all)
156 return 0;
157
158 /* If we have it listed already, skip it */
159 for (ref = local_ref_list ; ref ; ref = ref->next) {
160 if (!strcmp(ref->name, refname))
161 return 0;
162 }
163 }
164
165 len = strlen(refname)+1;
166 ref = xmalloc(sizeof(*ref) + len);
167 memset(ref->old_sha1, 0, 20);
168 memcpy(ref->new_sha1, sha1, 20);
169 memcpy(ref->name, refname, len);
170 ref->next = NULL;
171 *local_last_ref = ref;
172 local_last_ref = &ref->next;
173 return 0;
174}
175
176static int send_pack(int in, int out, int nr_match, char **match)
177{
178 struct ref *ref_list, **last_ref;
179 struct ref *ref;
180 int new_refs;
181
182 /* First we get all heads, whether matching or not.. */
183 last_ref = get_remote_heads(in, &ref_list, 0, NULL);
184
185 /*
186 * Go through the refs, see if we want to update
187 * any of them..
188 */
189 for (ref = ref_list; ref; ref = ref->next) {
190 unsigned char new_sha1[20];
191 char *name = ref->name;
192
193 if (nr_match && !path_match(name, nr_match, match))
194 continue;
195
196 if (read_ref(name, new_sha1) < 0)
197 continue;
198
199 if (!memcmp(ref->old_sha1, new_sha1, 20)) {
200 fprintf(stderr, "'%s' unchanged\n", name);
201 continue;
202 }
203
204 if (!ref_newer(new_sha1, ref->old_sha1)) {
205 error("remote '%s' isn't a strict parent of local", name);
206 continue;
207 }
208
209 /* Ok, mark it for update */
210 memcpy(ref->new_sha1, new_sha1, 20);
211 }
212
213 /*
214 * See if we have any refs that the other end didn't have
215 */
216 if (nr_match) {
217 local_ref_nr_match = nr_match;
218 local_ref_match = match;
219 local_ref_list = ref_list;
220 local_last_ref = last_ref;
221 for_each_ref(try_to_match);
222 }
223
224 /*
225 * Finally, tell the other end!
226 */
227 new_refs = 0;
228 for (ref = ref_list; ref; ref = ref->next) {
229 char old_hex[60], *new_hex;
230 if (is_zero_sha1(ref->new_sha1))
231 continue;
232 new_refs++;
233 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
234 new_hex = sha1_to_hex(ref->new_sha1);
235 packet_write(out, "%s %s %s", old_hex, new_hex, ref->name);
236 fprintf(stderr, "'%s': updating from %s to %s\n", ref->name, old_hex, new_hex);
237 }
238
239 packet_flush(out);
240 if (new_refs)
241 pack_objects(out, ref_list);
242 close(out);
243 return 0;
244}
245
246int main(int argc, char **argv)
247{
248 int i, nr_heads = 0;
249 char *dest = NULL;
250 char **heads = NULL;
251 int fd[2], ret;
252 pid_t pid;
253
254 argv++;
255 for (i = 1; i < argc; i++, argv++) {
256 char *arg = *argv;
257
258 if (*arg == '-') {
259 if (!strncmp(arg, "--exec=", 7)) {
260 exec = arg + 7;
261 continue;
262 }
263 if (!strcmp(arg, "--all")) {
264 send_all = 1;
265 continue;
266 }
267 if (!strcmp(arg, "--force")) {
268 force_update = 1;
269 continue;
270 }
271 usage(send_pack_usage);
272 }
273 if (!dest) {
274 dest = arg;
275 continue;
276 }
277 heads = argv;
278 nr_heads = argc - i;
279 break;
280 }
281 if (!dest)
282 usage(send_pack_usage);
283 pid = git_connect(fd, dest, exec);
284 if (pid < 0)
285 return 1;
286 ret = send_pack(fd[0], fd[1], nr_heads, heads);
287 close(fd[0]);
288 close(fd[1]);
289 finish_connect(pid);
290 return ret;
291}