tutorial: talk about user.name early and don't start with commit -a
[alt-git.git] / receive-pack.c
blobd56898c9b29d3e5ea01fd5a211790141d0beac21
1 #include "cache.h"
2 #include "pack.h"
3 #include "refs.h"
4 #include "pkt-line.h"
5 #include "run-command.h"
6 #include "exec_cmd.h"
7 #include "commit.h"
8 #include "object.h"
9 #include <sys/wait.h>
11 static const char receive_pack_usage[] = "git-receive-pack <git-dir>";
13 static int deny_non_fast_forwards = 0;
14 static int unpack_limit = 5000;
15 static int report_status;
17 static char capabilities[] = "report-status";
18 static int capabilities_sent;
20 static int receive_pack_config(const char *var, const char *value)
22 git_default_config(var, value);
24 if (strcmp(var, "receive.denynonfastforwards") == 0)
26 deny_non_fast_forwards = git_config_bool(var, value);
27 return 0;
30 if (strcmp(var, "receive.unpacklimit") == 0)
32 unpack_limit = git_config_int(var, value);
33 return 0;
36 return 0;
39 static int show_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
41 if (capabilities_sent)
42 packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
43 else
44 packet_write(1, "%s %s%c%s\n",
45 sha1_to_hex(sha1), path, 0, capabilities);
46 capabilities_sent = 1;
47 return 0;
50 static void write_head_info(void)
52 for_each_ref(show_ref, NULL);
53 if (!capabilities_sent)
54 show_ref("capabilities^{}", null_sha1, 0, NULL);
58 struct command {
59 struct command *next;
60 const char *error_string;
61 unsigned char old_sha1[20];
62 unsigned char new_sha1[20];
63 char ref_name[FLEX_ARRAY]; /* more */
66 static struct command *commands;
68 static char update_hook[] = "hooks/update";
70 static int run_update_hook(const char *refname,
71 char *old_hex, char *new_hex)
73 int code;
75 if (access(update_hook, X_OK) < 0)
76 return 0;
77 code = run_command(update_hook, refname, old_hex, new_hex, NULL);
78 switch (code) {
79 case 0:
80 return 0;
81 case -ERR_RUN_COMMAND_FORK:
82 return error("hook fork failed");
83 case -ERR_RUN_COMMAND_EXEC:
84 return error("hook execute failed");
85 case -ERR_RUN_COMMAND_WAITPID:
86 return error("waitpid failed");
87 case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
88 return error("waitpid is confused");
89 case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
90 return error("%s died of signal", update_hook);
91 case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
92 return error("%s died strangely", update_hook);
93 default:
94 error("%s exited with error code %d", update_hook, -code);
95 return -code;
99 static int update(struct command *cmd)
101 const char *name = cmd->ref_name;
102 unsigned char *old_sha1 = cmd->old_sha1;
103 unsigned char *new_sha1 = cmd->new_sha1;
104 char new_hex[41], old_hex[41];
105 struct ref_lock *lock;
107 cmd->error_string = NULL;
108 if (!strncmp(name, "refs/", 5) && check_ref_format(name + 5)) {
109 cmd->error_string = "funny refname";
110 return error("refusing to create funny ref '%s' locally",
111 name);
114 strcpy(new_hex, sha1_to_hex(new_sha1));
115 strcpy(old_hex, sha1_to_hex(old_sha1));
116 if (!has_sha1_file(new_sha1)) {
117 cmd->error_string = "bad pack";
118 return error("unpack should have generated %s, "
119 "but I can't find it!", new_hex);
121 if (deny_non_fast_forwards && !is_null_sha1(old_sha1)) {
122 struct commit *old_commit, *new_commit;
123 struct commit_list *bases, *ent;
125 old_commit = (struct commit *)parse_object(old_sha1);
126 new_commit = (struct commit *)parse_object(new_sha1);
127 bases = get_merge_bases(old_commit, new_commit, 1);
128 for (ent = bases; ent; ent = ent->next)
129 if (!hashcmp(old_sha1, ent->item->object.sha1))
130 break;
131 free_commit_list(bases);
132 if (!ent)
133 return error("denying non-fast forward;"
134 " you should pull first");
136 if (run_update_hook(name, old_hex, new_hex)) {
137 cmd->error_string = "hook declined";
138 return error("hook declined to update %s", name);
141 lock = lock_any_ref_for_update(name, old_sha1);
142 if (!lock) {
143 cmd->error_string = "failed to lock";
144 return error("failed to lock %s", name);
146 write_ref_sha1(lock, new_sha1, "push");
148 fprintf(stderr, "%s: %s -> %s\n", name, old_hex, new_hex);
149 return 0;
152 static char update_post_hook[] = "hooks/post-update";
154 static void run_update_post_hook(struct command *cmd)
156 struct command *cmd_p;
157 int argc;
158 const char **argv;
160 if (access(update_post_hook, X_OK) < 0)
161 return;
162 for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
163 if (cmd_p->error_string)
164 continue;
165 argc++;
167 argv = xmalloc(sizeof(*argv) * (1 + argc));
168 argv[0] = update_post_hook;
170 for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
171 char *p;
172 if (cmd_p->error_string)
173 continue;
174 p = xmalloc(strlen(cmd_p->ref_name) + 1);
175 strcpy(p, cmd_p->ref_name);
176 argv[argc] = p;
177 argc++;
179 argv[argc] = NULL;
180 run_command_v_opt(argc, argv, RUN_COMMAND_NO_STDIO);
184 * This gets called after(if) we've successfully
185 * unpacked the data payload.
187 static void execute_commands(void)
189 struct command *cmd = commands;
191 while (cmd) {
192 update(cmd);
193 cmd = cmd->next;
195 run_update_post_hook(commands);
198 static void read_head_info(void)
200 struct command **p = &commands;
201 for (;;) {
202 static char line[1000];
203 unsigned char old_sha1[20], new_sha1[20];
204 struct command *cmd;
205 char *refname;
206 int len, reflen;
208 len = packet_read_line(0, line, sizeof(line));
209 if (!len)
210 break;
211 if (line[len-1] == '\n')
212 line[--len] = 0;
213 if (len < 83 ||
214 line[40] != ' ' ||
215 line[81] != ' ' ||
216 get_sha1_hex(line, old_sha1) ||
217 get_sha1_hex(line + 41, new_sha1))
218 die("protocol error: expected old/new/ref, got '%s'",
219 line);
221 refname = line + 82;
222 reflen = strlen(refname);
223 if (reflen + 82 < len) {
224 if (strstr(refname + reflen + 1, "report-status"))
225 report_status = 1;
227 cmd = xmalloc(sizeof(struct command) + len - 80);
228 hashcpy(cmd->old_sha1, old_sha1);
229 hashcpy(cmd->new_sha1, new_sha1);
230 memcpy(cmd->ref_name, line + 82, len - 81);
231 cmd->error_string = "n/a (unpacker error)";
232 cmd->next = NULL;
233 *p = cmd;
234 p = &cmd->next;
238 static const char *parse_pack_header(struct pack_header *hdr)
240 char *c = (char*)hdr;
241 ssize_t remaining = sizeof(struct pack_header);
242 do {
243 ssize_t r = xread(0, c, remaining);
244 if (r <= 0)
245 return "eof before pack header was fully read";
246 remaining -= r;
247 c += r;
248 } while (remaining > 0);
249 if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
250 return "protocol error (pack signature mismatch detected)";
251 if (!pack_version_ok(hdr->hdr_version))
252 return "protocol error (pack version unsupported)";
253 return NULL;
256 static const char *pack_lockfile;
258 static const char *unpack(void)
260 struct pack_header hdr;
261 const char *hdr_err;
262 char hdr_arg[38];
264 hdr_err = parse_pack_header(&hdr);
265 if (hdr_err)
266 return hdr_err;
267 snprintf(hdr_arg, sizeof(hdr_arg), "--pack_header=%u,%u",
268 ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
270 if (ntohl(hdr.hdr_entries) < unpack_limit) {
271 int code;
272 const char *unpacker[3];
273 unpacker[0] = "unpack-objects";
274 unpacker[1] = hdr_arg;
275 unpacker[2] = NULL;
276 code = run_command_v_opt(1, unpacker, RUN_GIT_CMD);
277 switch (code) {
278 case 0:
279 return NULL;
280 case -ERR_RUN_COMMAND_FORK:
281 return "unpack fork failed";
282 case -ERR_RUN_COMMAND_EXEC:
283 return "unpack execute failed";
284 case -ERR_RUN_COMMAND_WAITPID:
285 return "waitpid failed";
286 case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
287 return "waitpid is confused";
288 case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
289 return "unpacker died of signal";
290 case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
291 return "unpacker died strangely";
292 default:
293 return "unpacker exited with error code";
295 } else {
296 const char *keeper[6];
297 int fd[2], s, len, status;
298 pid_t pid;
299 char keep_arg[256];
300 char packname[46];
302 s = sprintf(keep_arg, "--keep=receive-pack %i on ", getpid());
303 if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
304 strcpy(keep_arg + s, "localhost");
306 keeper[0] = "index-pack";
307 keeper[1] = "--stdin";
308 keeper[2] = "--fix-thin";
309 keeper[3] = hdr_arg;
310 keeper[4] = keep_arg;
311 keeper[5] = NULL;
313 if (pipe(fd) < 0)
314 return "index-pack pipe failed";
315 pid = fork();
316 if (pid < 0)
317 return "index-pack fork failed";
318 if (!pid) {
319 dup2(fd[1], 1);
320 close(fd[1]);
321 close(fd[0]);
322 execv_git_cmd(keeper);
323 die("execv of index-pack failed");
325 close(fd[1]);
328 * The first thing we expects from index-pack's output
329 * is "pack\t%40s\n" or "keep\t%40s\n" (46 bytes) where
330 * %40s is the newly created pack SHA1 name. In the "keep"
331 * case, we need it to remove the corresponding .keep file
332 * later on. If we don't get that then tough luck with it.
334 for (len = 0;
335 len < 46 && (s = xread(fd[0], packname+len, 46-len)) > 0;
336 len += s);
337 close(fd[0]);
338 if (len == 46 && packname[45] == '\n' &&
339 memcmp(packname, "keep\t", 5) == 0) {
340 char path[PATH_MAX];
341 packname[45] = 0;
342 snprintf(path, sizeof(path), "%s/pack/pack-%s.keep",
343 get_object_directory(), packname + 5);
344 pack_lockfile = xstrdup(path);
347 /* Then wrap our index-pack process. */
348 while (waitpid(pid, &status, 0) < 0)
349 if (errno != EINTR)
350 return "waitpid failed";
351 if (WIFEXITED(status)) {
352 int code = WEXITSTATUS(status);
353 if (code)
354 return "index-pack exited with error code";
355 reprepare_packed_git();
356 return NULL;
358 return "index-pack abnormal exit";
362 static void report(const char *unpack_status)
364 struct command *cmd;
365 packet_write(1, "unpack %s\n",
366 unpack_status ? unpack_status : "ok");
367 for (cmd = commands; cmd; cmd = cmd->next) {
368 if (!cmd->error_string)
369 packet_write(1, "ok %s\n",
370 cmd->ref_name);
371 else
372 packet_write(1, "ng %s %s\n",
373 cmd->ref_name, cmd->error_string);
375 packet_flush(1);
378 int main(int argc, char **argv)
380 int i;
381 char *dir = NULL;
383 argv++;
384 for (i = 1; i < argc; i++) {
385 char *arg = *argv++;
387 if (*arg == '-') {
388 /* Do flag handling here */
389 usage(receive_pack_usage);
391 if (dir)
392 usage(receive_pack_usage);
393 dir = arg;
395 if (!dir)
396 usage(receive_pack_usage);
398 if (!enter_repo(dir, 0))
399 die("'%s': unable to chdir or not a git archive", dir);
401 setup_ident();
402 git_config(receive_pack_config);
404 write_head_info();
406 /* EOF */
407 packet_flush(1);
409 read_head_info();
410 if (commands) {
411 const char *unpack_status = unpack();
412 if (!unpack_status)
413 execute_commands();
414 if (pack_lockfile)
415 unlink(pack_lockfile);
416 if (report_status)
417 report(unpack_status);
419 return 0;