[PATCH] git-branch: avoid getting confused by empty or nonexisting branches.
[gitweb.git] / receive-pack.c
index fb43107d82bc795383b743490e522887f389589e..f39703f7af9ae809b144b0f074561756717bf04a 100644 (file)
 #include "cache.h"
+#include "refs.h"
 #include "pkt-line.h"
 #include <sys/wait.h>
 
-static const char receive_pack_usage[] = "git-receive-pack [--unpack=executable] <git-dir> [heads]";
+static const char receive_pack_usage[] = "git-receive-pack <git-dir>";
 
 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 command {
-       struct command *next;
-       unsigned char old_sha1[20];
-       unsigned char new_sha1[20];
-       char ref_name[0];
-};
-
-struct command *commands = NULL;
 
 /*
  * This gets called after(if) we've successfully
@@ -104,10 +107,7 @@ 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 +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");
        }
@@ -178,44 +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);