diff options
Diffstat (limited to 'receive-pack.c')
| -rw-r--r-- | receive-pack.c | 64 |
1 files changed, 59 insertions, 5 deletions
diff --git a/receive-pack.c b/receive-pack.c index fb43107..7ce5f1e 100644 --- a/receive-pack.c +++ b/receive-pack.c @@ -77,6 +77,8 @@ static void write_head_info(const char *base, int nr, char **match) } if (read_ref(path, sha1) < 0) continue; + if (!has_sha1_file(sha1)) + continue; if (nr && !path_match(path, nr, match)) continue; show_ref(path, sha1); @@ -95,6 +97,61 @@ struct command { struct command *commands = NULL; +static int verify_old_ref(const char *name, char *hex_contents) +{ + int fd, ret; + char buffer[60]; + + fd = open(name, O_RDONLY); + if (fd < 0) + return -1; + ret = read(fd, buffer, 40); + close(fd); + if (ret != 40) + return -1; + if (memcmp(buffer, hex_contents, 40)) + return -1; + return 0; +} + +static void update(const char *name, unsigned char *old_sha1, unsigned char *new_sha1) +{ + char new_hex[60], *old_hex, *lock_name; + int newfd, namelen, written; + + namelen = strlen(name); + lock_name = xmalloc(namelen + 10); + memcpy(lock_name, name, namelen); + memcpy(lock_name + namelen, ".lock", 6); + + strcpy(new_hex, sha1_to_hex(new_sha1)); + new_hex[40] = '\n'; + new_hex[41] = 0; + old_hex = sha1_to_hex(old_sha1); + if (!has_sha1_file(new_sha1)) + die("unpack should have generated %s, but I can't find it!", new_hex); + + newfd = open(lock_name, O_CREAT | O_EXCL | O_WRONLY, 0644); + if (newfd < 0) + die("unable to create %s (%s)", lock_name, strerror(errno)); + written = write(newfd, new_hex, 41); + close(newfd); + if (written != 41) { + unlink(lock_name); + die("unable to write %s", lock_name); + } + if (verify_old_ref(name, old_hex) < 0) { + unlink(lock_name); + die("%s changed during push", name); + } + if (rename(lock_name, name) < 0) { + unlink(lock_name); + die("unable to replace %s", name); + } + fprintf(stderr, "%s: %s -> %s\n", name, old_hex, new_hex); +} + + /* * This gets called after(if) we've successfully * unpacked the data payload. @@ -104,10 +161,7 @@ static void execute_commands(void) struct command *cmd = commands; while (cmd) { - char old_hex[60], *new_hex; - strcpy(old_hex, sha1_to_hex(cmd->old_sha1)); - new_hex = sha1_to_hex(cmd->new_sha1); - fprintf(stderr, "%s: %s -> %s\n", cmd->ref_name, old_hex, new_hex); + update(cmd->ref_name, cmd->old_sha1, cmd->new_sha1); cmd = cmd->next; } } @@ -149,7 +203,6 @@ static void unpack(void) if (pid < 0) die("unpack fork failed"); if (!pid) { - setenv("GIT_DIR", ".", 1); execlp(unpacker, unpacker, NULL); die("unpack execute failed"); } @@ -212,6 +265,7 @@ int main(int argc, char **argv) /* If we have a ".git" directory, chdir to it */ chdir(".git"); + setenv("GIT_DIR", ".", 1); if (access("objects", X_OK) < 0 || access("refs/heads", X_OK) < 0) die("%s doesn't appear to be a git directory", dir); |