4 static const char receive_pack_usage[] = "git-receive-pack [--unpack=executable] <git-dir> [heads]";
6 static const char *unpacker = "git-unpack-objects";
8 static int path_match(const char *path, int nr, char **match)
11 int pathlen = strlen(path);
13 for (i = 0; i < nr; i++) {
17 if (!len || len > pathlen)
19 if (memcmp(path + pathlen - len, s, len))
21 if (pathlen > len && path[pathlen - len - 1] != '/')
29 static void safe_write(int fd, const void *buf, unsigned n)
32 int ret = write(fd, buf, n);
39 die("write error (disk full?)");
40 if (errno == EAGAIN || errno == EINTR)
42 die("write error (%s)", strerror(errno));
47 * If we buffered things up above (we don't, but we should),
50 static void flush_safe(int fd)
55 * Write a packetized stream, where each line is preceded by
56 * its length (including the header) as a 4-byte hex number.
57 * A length of 'zero' means end of stream (and a length of 1-3
60 #define hex(a) (hexchar[(a) & 15])
61 static void packet_write(const char *fmt, ...)
63 static char buffer[1000];
64 static char hexchar[] = "0123456789abcdef";
69 n = vsnprintf(buffer + 4, sizeof(buffer) - 4, fmt, args);
71 if (n >= sizeof(buffer)-4)
72 die("protocol error: impossibly long line");
74 buffer[0] = hex(n >> 12);
75 buffer[1] = hex(n >> 8);
76 buffer[2] = hex(n >> 4);
78 safe_write(1, buffer, n);
81 static void show_ref(const char *path, unsigned char *sha1)
83 packet_write("%s %s\n", sha1_to_hex(sha1), path);
86 static int read_ref(const char *path, unsigned char *sha1)
89 int fd = open(path, O_RDONLY);
93 if (read(fd, buffer, sizeof(buffer)) >= 40)
94 ret = get_sha1_hex(buffer, sha1);
100 static void write_head_info(const char *base, int nr, char **match)
102 DIR *dir = opendir(base);
106 int baselen = strlen(base);
107 char *path = xmalloc(baselen + 257);
108 memcpy(path, base, baselen);
110 while ((de = readdir(dir)) != NULL) {
115 if (de->d_name[0] == '.')
117 namelen = strlen(de->d_name);
120 memcpy(path + baselen, de->d_name, namelen+1);
121 if (lstat(path, &st) < 0)
123 if (S_ISDIR(st.st_mode)) {
124 path[baselen + namelen] = '/';
125 path[baselen + namelen + 1] = 0;
126 write_head_info(path, nr, match);
129 if (read_ref(path, sha1) < 0)
131 if (nr && !path_match(path, nr, match))
133 show_ref(path, sha1);
141 * This is all pretty stupid, but we use this packetized line
142 * format to make a streaming format possible without ever
143 * over-running the read buffers. That way we'll never read
144 * into what might be the pack data (which should go to another
147 * The writing side could use stdio, but since the reading
148 * side can't, we stay with pure read/write interfaces.
150 static void safe_read(int fd, void *buffer, unsigned size)
155 int ret = read(0, buffer + n, size - n);
157 if (errno == EINTR || errno == EAGAIN)
159 die("read error (%s)", strerror(errno));
162 die("unexpected EOF");
167 static int safe_read_line(char *buffer, unsigned size)
171 safe_read(0, buffer, 4);
174 for (n = 0; n < 4; n++) {
175 unsigned char c = buffer[n];
177 if (c >= '0' && c <= '9') {
181 if (c >= 'a' && c <= 'f') {
185 if (c >= 'A' && c <= 'F') {
189 die("protocol error: bad line length character");
193 if (len < 4 || len >= size)
194 die("protocol error: bad line length %d", len);
195 safe_read(0, buffer + 4, len - 4);
205 struct line *commands = NULL;
208 * This gets called after(if) we've successfully
209 * unpacked the data payload.
211 static void execute_commands(void)
213 struct line *line = commands;
216 printf("%s", line->data);
221 static void read_head_info(void)
223 struct line **p = &commands;
225 static char line[1000];
226 int len = safe_read_line(line, sizeof(line));
230 n = xmalloc(sizeof(struct line) + len);
232 memcpy(n->data, line + 4, len - 3);
238 static void unpack(void)
243 die("unpack fork failed");
245 char *const envp[] = { "GIT_DIR=.", NULL };
246 execle(unpacker, unpacker, NULL, envp);
247 die("unpack execute failed");
252 int retval = waitpid(pid, &status, 0);
257 die("waitpid failed (%s)", strerror(retval));
260 die("waitpid is confused");
261 if (WIFSIGNALED(status))
262 die("%s died of signal %d", unpacker, WTERMSIG(status));
263 if (!WIFEXITED(status))
264 die("%s died out of really strange complications", unpacker);
265 code = WEXITSTATUS(status);
267 die("%s exited with error code %d", unpacker, code);
272 int main(int argc, char **argv)
275 const char *dir = NULL;
279 for (i = 1; i < argc; i++) {
280 const char *arg = *argv++;
283 if (!strncmp(arg, "--unpack=", 9)) {
287 /* Do flag handling here */
288 usage(receive_pack_usage);
292 nr_heads = argc - i - 1;
296 usage(receive_pack_usage);
298 /* chdir to the directory. If that fails, try appending ".git" */
299 if (chdir(dir) < 0) {
300 static char path[PATH_MAX];
301 snprintf(path, sizeof(path), "%s.git", dir);
303 die("unable to cd to %s", dir);
306 /* If we have a ".git" directory, chdir to it */
309 if (access("objects", X_OK) < 0 || access("refs/heads", X_OK) < 0)
310 die("%s doesn't appear to be a git directory", dir);
311 write_head_info("refs/", nr_heads, heads);
314 safe_write(1, "0000", 4);