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