Merge branch 'lj/refs'
[git/git.git] / receive-pack.c
1 #include "cache.h"
2 #include "refs.h"
3 #include "pkt-line.h"
4 #include "run-command.h"
5 #include "commit.h"
6 #include "object.h"
7
8 static const char receive_pack_usage[] = "git-receive-pack <git-dir>";
9
10 static const char *unpacker[] = { "unpack-objects", NULL };
11
12 static int deny_non_fast_forwards = 0;
13 static int report_status;
14
15 static char capabilities[] = "report-status";
16 static int capabilities_sent;
17
18 static int receive_pack_config(const char *var, const char *value)
19 {
20 git_default_config(var, value);
21
22 if (strcmp(var, "receive.denynonfastforwards") == 0)
23 {
24 deny_non_fast_forwards = git_config_bool(var, value);
25 return 0;
26 }
27
28 return 0;
29 }
30
31 static int show_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
32 {
33 if (capabilities_sent)
34 packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
35 else
36 packet_write(1, "%s %s%c%s\n",
37 sha1_to_hex(sha1), path, 0, capabilities);
38 capabilities_sent = 1;
39 return 0;
40 }
41
42 static void write_head_info(void)
43 {
44 for_each_ref(show_ref, NULL);
45 if (!capabilities_sent)
46 show_ref("capabilities^{}", null_sha1, 0, NULL);
47
48 }
49
50 struct command {
51 struct command *next;
52 const char *error_string;
53 unsigned char old_sha1[20];
54 unsigned char new_sha1[20];
55 char ref_name[FLEX_ARRAY]; /* more */
56 };
57
58 static struct command *commands;
59
60 static char update_hook[] = "hooks/update";
61
62 static int run_update_hook(const char *refname,
63 char *old_hex, char *new_hex)
64 {
65 int code;
66
67 if (access(update_hook, X_OK) < 0)
68 return 0;
69 code = run_command(update_hook, refname, old_hex, new_hex, NULL);
70 switch (code) {
71 case 0:
72 return 0;
73 case -ERR_RUN_COMMAND_FORK:
74 return error("hook fork failed");
75 case -ERR_RUN_COMMAND_EXEC:
76 return error("hook execute failed");
77 case -ERR_RUN_COMMAND_WAITPID:
78 return error("waitpid failed");
79 case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
80 return error("waitpid is confused");
81 case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
82 return error("%s died of signal", update_hook);
83 case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
84 return error("%s died strangely", update_hook);
85 default:
86 error("%s exited with error code %d", update_hook, -code);
87 return -code;
88 }
89 }
90
91 static int update(struct command *cmd)
92 {
93 const char *name = cmd->ref_name;
94 unsigned char *old_sha1 = cmd->old_sha1;
95 unsigned char *new_sha1 = cmd->new_sha1;
96 char new_hex[41], old_hex[41];
97 struct ref_lock *lock;
98
99 cmd->error_string = NULL;
100 if (!strncmp(name, "refs/", 5) && check_ref_format(name + 5)) {
101 cmd->error_string = "funny refname";
102 return error("refusing to create funny ref '%s' locally",
103 name);
104 }
105
106 strcpy(new_hex, sha1_to_hex(new_sha1));
107 strcpy(old_hex, sha1_to_hex(old_sha1));
108 if (!has_sha1_file(new_sha1)) {
109 cmd->error_string = "bad pack";
110 return error("unpack should have generated %s, "
111 "but I can't find it!", new_hex);
112 }
113 if (deny_non_fast_forwards && !is_null_sha1(old_sha1)) {
114 struct commit *old_commit, *new_commit;
115 struct commit_list *bases, *ent;
116
117 old_commit = (struct commit *)parse_object(old_sha1);
118 new_commit = (struct commit *)parse_object(new_sha1);
119 bases = get_merge_bases(old_commit, new_commit, 1);
120 for (ent = bases; ent; ent = ent->next)
121 if (!hashcmp(old_sha1, ent->item->object.sha1))
122 break;
123 free_commit_list(bases);
124 if (!ent)
125 return error("denying non-fast forward;"
126 " you should pull first");
127 }
128 if (run_update_hook(name, old_hex, new_hex)) {
129 cmd->error_string = "hook declined";
130 return error("hook declined to update %s", name);
131 }
132
133 lock = lock_any_ref_for_update(name, old_sha1);
134 if (!lock) {
135 cmd->error_string = "failed to lock";
136 return error("failed to lock %s", name);
137 }
138 write_ref_sha1(lock, new_sha1, "push");
139
140 fprintf(stderr, "%s: %s -> %s\n", name, old_hex, new_hex);
141 return 0;
142 }
143
144 static char update_post_hook[] = "hooks/post-update";
145
146 static void run_update_post_hook(struct command *cmd)
147 {
148 struct command *cmd_p;
149 int argc;
150 const char **argv;
151
152 if (access(update_post_hook, X_OK) < 0)
153 return;
154 for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
155 if (cmd_p->error_string)
156 continue;
157 argc++;
158 }
159 argv = xmalloc(sizeof(*argv) * (1 + argc));
160 argv[0] = update_post_hook;
161
162 for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
163 char *p;
164 if (cmd_p->error_string)
165 continue;
166 p = xmalloc(strlen(cmd_p->ref_name) + 1);
167 strcpy(p, cmd_p->ref_name);
168 argv[argc] = p;
169 argc++;
170 }
171 argv[argc] = NULL;
172 run_command_v_opt(argc, argv, RUN_COMMAND_NO_STDIO);
173 }
174
175 /*
176 * This gets called after(if) we've successfully
177 * unpacked the data payload.
178 */
179 static void execute_commands(void)
180 {
181 struct command *cmd = commands;
182
183 while (cmd) {
184 update(cmd);
185 cmd = cmd->next;
186 }
187 run_update_post_hook(commands);
188 }
189
190 static void read_head_info(void)
191 {
192 struct command **p = &commands;
193 for (;;) {
194 static char line[1000];
195 unsigned char old_sha1[20], new_sha1[20];
196 struct command *cmd;
197 char *refname;
198 int len, reflen;
199
200 len = packet_read_line(0, line, sizeof(line));
201 if (!len)
202 break;
203 if (line[len-1] == '\n')
204 line[--len] = 0;
205 if (len < 83 ||
206 line[40] != ' ' ||
207 line[81] != ' ' ||
208 get_sha1_hex(line, old_sha1) ||
209 get_sha1_hex(line + 41, new_sha1))
210 die("protocol error: expected old/new/ref, got '%s'",
211 line);
212
213 refname = line + 82;
214 reflen = strlen(refname);
215 if (reflen + 82 < len) {
216 if (strstr(refname + reflen + 1, "report-status"))
217 report_status = 1;
218 }
219 cmd = xmalloc(sizeof(struct command) + len - 80);
220 hashcpy(cmd->old_sha1, old_sha1);
221 hashcpy(cmd->new_sha1, new_sha1);
222 memcpy(cmd->ref_name, line + 82, len - 81);
223 cmd->error_string = "n/a (unpacker error)";
224 cmd->next = NULL;
225 *p = cmd;
226 p = &cmd->next;
227 }
228 }
229
230 static const char *unpack(int *error_code)
231 {
232 int code = run_command_v_opt(1, unpacker, RUN_GIT_CMD);
233
234 *error_code = 0;
235 switch (code) {
236 case 0:
237 return NULL;
238 case -ERR_RUN_COMMAND_FORK:
239 return "unpack fork failed";
240 case -ERR_RUN_COMMAND_EXEC:
241 return "unpack execute failed";
242 case -ERR_RUN_COMMAND_WAITPID:
243 return "waitpid failed";
244 case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
245 return "waitpid is confused";
246 case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
247 return "unpacker died of signal";
248 case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
249 return "unpacker died strangely";
250 default:
251 *error_code = -code;
252 return "unpacker exited with error code";
253 }
254 }
255
256 static void report(const char *unpack_status)
257 {
258 struct command *cmd;
259 packet_write(1, "unpack %s\n",
260 unpack_status ? unpack_status : "ok");
261 for (cmd = commands; cmd; cmd = cmd->next) {
262 if (!cmd->error_string)
263 packet_write(1, "ok %s\n",
264 cmd->ref_name);
265 else
266 packet_write(1, "ng %s %s\n",
267 cmd->ref_name, cmd->error_string);
268 }
269 packet_flush(1);
270 }
271
272 int main(int argc, char **argv)
273 {
274 int i;
275 char *dir = NULL;
276
277 argv++;
278 for (i = 1; i < argc; i++) {
279 char *arg = *argv++;
280
281 if (*arg == '-') {
282 /* Do flag handling here */
283 usage(receive_pack_usage);
284 }
285 if (dir)
286 usage(receive_pack_usage);
287 dir = arg;
288 }
289 if (!dir)
290 usage(receive_pack_usage);
291
292 if (!enter_repo(dir, 0))
293 die("'%s': unable to chdir or not a git archive", dir);
294
295 setup_ident();
296 git_config(receive_pack_config);
297
298 write_head_info();
299
300 /* EOF */
301 packet_flush(1);
302
303 read_head_info();
304 if (commands) {
305 int code;
306 const char *unpack_status = unpack(&code);
307 if (!unpack_status)
308 execute_commands();
309 if (report_status)
310 report(unpack_status);
311 }
312 return 0;
313 }