5 static const char receive_pack_usage
[] = "git-receive-pack <git-dir>";
7 static const char *unpacker
= "git-unpack-objects";
9 static void show_ref(const char *path
, unsigned char *sha1
)
11 packet_write(1, "%s %s\n", sha1_to_hex(sha1
), path
);
14 static int read_ref(const char *path
, unsigned char *sha1
)
17 int fd
= open(path
, O_RDONLY
);
21 if (read(fd
, buffer
, sizeof(buffer
)) >= 40)
22 ret
= get_sha1_hex(buffer
, sha1
);
28 static void write_head_info(const char *base
)
30 DIR *dir
= opendir(base
);
34 int baselen
= strlen(base
);
35 char *path
= xmalloc(baselen
+ 257);
36 memcpy(path
, base
, baselen
);
38 while ((de
= readdir(dir
)) != NULL
) {
43 if (de
->d_name
[0] == '.')
45 namelen
= strlen(de
->d_name
);
48 memcpy(path
+ baselen
, de
->d_name
, namelen
+1);
49 if (lstat(path
, &st
) < 0)
51 if (S_ISDIR(st
.st_mode
)) {
52 path
[baselen
+ namelen
] = '/';
53 path
[baselen
+ namelen
+ 1] = 0;
54 write_head_info(path
);
57 if (read_ref(path
, sha1
) < 0)
59 if (!has_sha1_file(sha1
))
70 unsigned char old_sha1
[20];
71 unsigned char new_sha1
[20];
75 struct command
*commands
= NULL
;
77 static int is_all_zeroes(const char *hex
)
80 for (i
= 0; i
< 40; i
++)
86 static int verify_old_ref(const char *name
, char *hex_contents
)
91 if (is_all_zeroes(hex_contents
))
93 fd
= open(name
, O_RDONLY
);
96 ret
= read(fd
, buffer
, 40);
100 if (memcmp(buffer
, hex_contents
, 40))
105 static void update(const char *name
, unsigned char *old_sha1
, unsigned char *new_sha1
)
107 char new_hex
[60], *old_hex
, *lock_name
;
108 int newfd
, namelen
, written
;
110 namelen
= strlen(name
);
111 lock_name
= xmalloc(namelen
+ 10);
112 memcpy(lock_name
, name
, namelen
);
113 memcpy(lock_name
+ namelen
, ".lock", 6);
115 strcpy(new_hex
, sha1_to_hex(new_sha1
));
116 old_hex
= sha1_to_hex(old_sha1
);
117 if (!has_sha1_file(new_sha1
))
118 die("unpack should have generated %s, but I can't find it!", new_hex
);
120 newfd
= open(lock_name
, O_CREAT
| O_EXCL
| O_WRONLY
, 0644);
122 die("unable to create %s (%s)", lock_name
, strerror(errno
));
124 /* Write the ref with an ending '\n' */
127 written
= write(newfd
, new_hex
, 41);
128 /* Remove the '\n' again */
134 die("unable to write %s", lock_name
);
136 if (verify_old_ref(name
, old_hex
) < 0) {
138 die("%s changed during push", name
);
140 if (rename(lock_name
, name
) < 0) {
142 die("unable to replace %s", name
);
144 fprintf(stderr
, "%s: %s -> %s\n", name
, old_hex
, new_hex
);
149 * This gets called after(if) we've successfully
150 * unpacked the data payload.
152 static void execute_commands(void)
154 struct command
*cmd
= commands
;
157 update(cmd
->ref_name
, cmd
->old_sha1
, cmd
->new_sha1
);
162 static void read_head_info(void)
164 struct command
**p
= &commands
;
166 static char line
[1000];
167 unsigned char old_sha1
[20], new_sha1
[20];
171 len
= packet_read_line(0, line
, sizeof(line
));
174 if (line
[len
-1] == '\n')
179 get_sha1_hex(line
, old_sha1
) ||
180 get_sha1_hex(line
+ 41, new_sha1
))
181 die("protocol error: expected old/new/ref, got '%s'", line
);
182 cmd
= xmalloc(sizeof(struct command
) + len
- 80);
183 memcpy(cmd
->old_sha1
, old_sha1
, 20);
184 memcpy(cmd
->new_sha1
, new_sha1
, 20);
185 memcpy(cmd
->ref_name
, line
+ 82, len
- 81);
192 static void unpack(void)
197 die("unpack fork failed");
199 execlp(unpacker
, unpacker
, NULL
);
200 die("unpack execute failed");
205 int retval
= waitpid(pid
, &status
, 0);
210 die("waitpid failed (%s)", strerror(retval
));
213 die("waitpid is confused");
214 if (WIFSIGNALED(status
))
215 die("%s died of signal %d", unpacker
, WTERMSIG(status
));
216 if (!WIFEXITED(status
))
217 die("%s died out of really strange complications", unpacker
);
218 code
= WEXITSTATUS(status
);
220 die("%s exited with error code %d", unpacker
, code
);
225 int main(int argc
, char **argv
)
228 const char *dir
= NULL
;
231 for (i
= 1; i
< argc
; i
++) {
232 const char *arg
= *argv
++;
235 /* Do flag handling here */
236 usage(receive_pack_usage
);
239 usage(receive_pack_usage
);
243 usage(receive_pack_usage
);
245 /* chdir to the directory. If that fails, try appending ".git" */
246 if (chdir(dir
) < 0) {
247 static char path
[PATH_MAX
];
248 snprintf(path
, sizeof(path
), "%s.git", dir
);
250 die("unable to cd to %s", dir
);
253 /* If we have a ".git" directory, chdir to it */
255 setenv("GIT_DIR", ".", 1);
257 if (access("objects", X_OK
) < 0 || access("refs/heads", X_OK
) < 0)
258 die("%s doesn't appear to be a git directory", dir
);
259 write_head_info("refs/");