4 #include "run-command.h"
7 static const char receive_pack_usage[] = "git-receive-pack <git-dir>";
9 static const char unpacker[] = "git-unpack-objects";
11 static int show_ref(const char *path, const unsigned char *sha1)
13 packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
17 static void write_head_info(void)
19 for_each_ref(show_ref);
24 unsigned char old_sha1[20];
25 unsigned char new_sha1[20];
29 static struct command *commands = NULL;
31 static int is_all_zeroes(const char *hex)
34 for (i = 0; i < 40; i++)
40 static int verify_old_ref(const char *name, char *hex_contents)
45 if (is_all_zeroes(hex_contents))
47 fd = open(name, O_RDONLY);
50 ret = read(fd, buffer, 40);
54 if (memcmp(buffer, hex_contents, 40))
59 static char update_hook[] = "hooks/update";
61 static int run_update_hook(const char *refname,
62 char *old_hex, char *new_hex)
66 if (access(update_hook, X_OK) < 0)
68 code = run_command(update_hook, refname, old_hex, new_hex, NULL);
72 case -ERR_RUN_COMMAND_FORK:
73 die("hook fork failed");
74 case -ERR_RUN_COMMAND_EXEC:
75 die("hook execute failed");
76 case -ERR_RUN_COMMAND_WAITPID:
77 die("waitpid failed");
78 case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
79 die("waitpid is confused");
80 case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
81 fprintf(stderr, "%s died of signal", update_hook);
83 case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
84 die("%s died strangely", update_hook);
86 error("%s exited with error code %d", update_hook, -code);
91 static void update(const char *name, unsigned char *old_sha1, unsigned char *new_sha1)
93 char new_hex[60], *old_hex, *lock_name;
94 int newfd, namelen, written;
96 namelen = strlen(name);
97 lock_name = xmalloc(namelen + 10);
98 memcpy(lock_name, name, namelen);
99 memcpy(lock_name + namelen, ".lock", 6);
101 strcpy(new_hex, sha1_to_hex(new_sha1));
102 old_hex = sha1_to_hex(old_sha1);
103 if (!has_sha1_file(new_sha1))
104 die("unpack should have generated %s, but I can't find it!", new_hex);
106 newfd = open(lock_name, O_CREAT | O_EXCL | O_WRONLY, 0666);
108 die("unable to create %s (%s)", lock_name, strerror(errno));
110 /* Write the ref with an ending '\n' */
113 written = write(newfd, new_hex, 41);
114 /* Remove the '\n' again */
120 die("unable to write %s", lock_name);
122 if (verify_old_ref(name, old_hex) < 0) {
124 die("%s changed during push", name);
126 if (run_update_hook(name, old_hex, new_hex)) {
128 fprintf(stderr, "hook declined to update %s\n", name);
130 else if (rename(lock_name, name) < 0) {
132 die("unable to replace %s", name);
135 fprintf(stderr, "%s: %s -> %s\n", name, old_hex, new_hex);
140 * This gets called after(if) we've successfully
141 * unpacked the data payload.
143 static void execute_commands(void)
145 struct command *cmd = commands;
148 update(cmd->ref_name, cmd->old_sha1, cmd->new_sha1);
151 run_update_hook("", NULL, NULL);
154 static void read_head_info(void)
156 struct command **p = &commands;
158 static char line[1000];
159 unsigned char old_sha1[20], new_sha1[20];
163 len = packet_read_line(0, line, sizeof(line));
166 if (line[len-1] == '\n')
171 get_sha1_hex(line, old_sha1) ||
172 get_sha1_hex(line + 41, new_sha1))
173 die("protocol error: expected old/new/ref, got '%s'", line);
174 cmd = xmalloc(sizeof(struct command) + len - 80);
175 memcpy(cmd->old_sha1, old_sha1, 20);
176 memcpy(cmd->new_sha1, new_sha1, 20);
177 memcpy(cmd->ref_name, line + 82, len - 81);
184 static void unpack(void)
186 int code = run_command(unpacker, NULL);
190 case -ERR_RUN_COMMAND_FORK:
191 die("unpack fork failed");
192 case -ERR_RUN_COMMAND_EXEC:
193 die("unpack execute failed");
194 case -ERR_RUN_COMMAND_WAITPID:
195 die("waitpid failed");
196 case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
197 die("waitpid is confused");
198 case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
199 die("%s died of signal", unpacker);
200 case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
201 die("%s died strangely", unpacker);
203 die("%s exited with error code %d", unpacker, -code);
207 int main(int argc, char **argv)
210 const char *dir = NULL;
213 for (i = 1; i < argc; i++) {
214 const char *arg = *argv++;
217 /* Do flag handling here */
218 usage(receive_pack_usage);
221 usage(receive_pack_usage);
225 usage(receive_pack_usage);
227 /* chdir to the directory. If that fails, try appending ".git" */
228 if (chdir(dir) < 0) {
229 if (chdir(mkpath("%s.git", dir)) < 0)
230 die("unable to cd to %s", dir);
233 /* If we have a ".git" directory, chdir to it */
235 setenv("GIT_DIR", ".", 1);
237 if (access("objects", X_OK) < 0 || access("refs/heads", X_OK) < 0)
238 die("%s doesn't appear to be a git directory", dir);