X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=receive-pack.c;h=f39703f7af9ae809b144b0f074561756717bf04a;hb=9153368d1bc296b6dbd0c3606a04a7274c6edc7e;hp=ce0b3c5795f37b4908e3cbb7e45acc79f26da742;hpb=7f8e982834bbc476e73c2ec02ebe8749caef51bc;p=git.git diff --git a/receive-pack.c b/receive-pack.c index ce0b3c57..f39703f7 100644 --- a/receive-pack.c +++ b/receive-pack.c @@ -1,97 +1,102 @@ #include "cache.h" +#include "refs.h" #include "pkt-line.h" #include -static const char receive_pack_usage[] = "git-receive-pack [--unpack=executable] [heads]"; +static const char receive_pack_usage[] = "git-receive-pack "; static const char *unpacker = "git-unpack-objects"; -static int path_match(const char *path, int nr, char **match) +static int show_ref(const char *path, const unsigned char *sha1) { - int i; - int pathlen = strlen(path); - - for (i = 0; i < nr; i++) { - char *s = match[i]; - int len = strlen(s); - - if (!len || len > pathlen) - continue; - if (memcmp(path + pathlen - len, s, len)) - continue; - if (pathlen > len && path[pathlen - len - 1] != '/') - continue; - *s = 0; - return 1; - } + packet_write(1, "%s %s\n", sha1_to_hex(sha1), path); return 0; } -static void show_ref(const char *path, unsigned char *sha1) +static void write_head_info(void) { - packet_write(1, "%s %s\n", sha1_to_hex(sha1), path); + for_each_ref(show_ref); } -static int read_ref(const char *path, unsigned char *sha1) +struct command { + struct command *next; + unsigned char old_sha1[20]; + unsigned char new_sha1[20]; + char ref_name[0]; +}; + +static struct command *commands = NULL; + +static int is_all_zeroes(const char *hex) { - int ret = -1; - int fd = open(path, O_RDONLY); - - if (fd >= 0) { - char buffer[60]; - if (read(fd, buffer, sizeof(buffer)) >= 40) - ret = get_sha1_hex(buffer, sha1); - close(fd); - } - return ret; + int i; + for (i = 0; i < 40; i++) + if (*hex++ != '0') + return 0; + return 1; } -static void write_head_info(const char *base, int nr, char **match) +static int verify_old_ref(const char *name, char *hex_contents) { - DIR *dir = opendir(base); - - if (dir) { - struct dirent *de; - int baselen = strlen(base); - char *path = xmalloc(baselen + 257); - memcpy(path, base, baselen); - - while ((de = readdir(dir)) != NULL) { - char sha1[20]; - struct stat st; - int namelen; + int fd, ret; + char buffer[60]; + + if (is_all_zeroes(hex_contents)) + return 0; + 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; +} - if (de->d_name[0] == '.') - continue; - namelen = strlen(de->d_name); - if (namelen > 255) - continue; - memcpy(path + baselen, de->d_name, namelen+1); - if (lstat(path, &st) < 0) - continue; - if (S_ISDIR(st.st_mode)) { - path[baselen + namelen] = '/'; - path[baselen + namelen + 1] = 0; - write_head_info(path, nr, match); - continue; - } - if (read_ref(path, sha1) < 0) - continue; - if (nr && !path_match(path, nr, match)) - continue; - show_ref(path, sha1); - } - free(path); - closedir(dir); +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)); + 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, 0666); + if (newfd < 0) + die("unable to create %s (%s)", lock_name, strerror(errno)); + + /* Write the ref with an ending '\n' */ + new_hex[40] = '\n'; + new_hex[41] = 0; + written = write(newfd, new_hex, 41); + /* Remove the '\n' again */ + new_hex[40] = 0; + + 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); } -struct line { - struct line *next; - char data[0]; -}; - -struct line *commands = NULL; /* * This gets called after(if) we've successfully @@ -99,28 +104,41 @@ struct line *commands = NULL; */ static void execute_commands(void) { - struct line *line = commands; + struct command *cmd = commands; - while (line) { - fprintf(stderr, "%s", line->data); - line = line->next; + while (cmd) { + update(cmd->ref_name, cmd->old_sha1, cmd->new_sha1); + cmd = cmd->next; } } static void read_head_info(void) { - struct line **p = &commands; + struct command **p = &commands; for (;;) { static char line[1000]; - int len = packet_read_line(0, line, sizeof(line)); - struct line *n; + unsigned char old_sha1[20], new_sha1[20]; + struct command *cmd; + int len; + + len = packet_read_line(0, line, sizeof(line)); if (!len) break; - n = xmalloc(sizeof(struct line) + len); - n->next = NULL; - memcpy(n->data, line + 4, len - 3); - *p = n; - p = &n->next; + if (line[len-1] == '\n') + line[--len] = 0; + if (len < 83 || + line[40] != ' ' || + line[81] != ' ' || + get_sha1_hex(line, old_sha1) || + get_sha1_hex(line + 41, new_sha1)) + die("protocol error: expected old/new/ref, got '%s'", line); + cmd = xmalloc(sizeof(struct command) + len - 80); + memcpy(cmd->old_sha1, old_sha1, 20); + memcpy(cmd->new_sha1, new_sha1, 20); + memcpy(cmd->ref_name, line + 82, len - 81); + cmd->next = NULL; + *p = cmd; + p = &cmd->next; } } @@ -131,7 +149,6 @@ 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"); } @@ -160,44 +177,37 @@ static void unpack(void) int main(int argc, char **argv) { - int i, nr_heads = 0; + int i; const char *dir = NULL; - char **heads = NULL; argv++; for (i = 1; i < argc; i++) { const char *arg = *argv++; if (*arg == '-') { - if (!strncmp(arg, "--unpack=", 9)) { - unpacker = arg+9; - continue; - } /* Do flag handling here */ usage(receive_pack_usage); } + if (dir) + usage(receive_pack_usage); dir = arg; - heads = argv; - nr_heads = argc - i - 1; - break; } if (!dir) usage(receive_pack_usage); /* chdir to the directory. If that fails, try appending ".git" */ if (chdir(dir) < 0) { - static char path[PATH_MAX]; - snprintf(path, sizeof(path), "%s.git", dir); - if (chdir(path) < 0) + if (chdir(mkpath("%s.git", dir)) < 0) die("unable to cd to %s", dir); } /* 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); - write_head_info("refs/", nr_heads, heads); + write_head_info(); /* EOF */ packet_flush(1);