gitweb setup instruction: rewrite HEAD and root as well

diff --git a/setup.c b/setup.c
index 1b4fa6a8c4289bedf10f57d9aa19db4c7f186b01..d630e374e7c03b934de14adceb93c9c327796e6d 100644 (file)
--- a/setup.c
+++ b/setup.c
@@ -300,7 +300,7 @@ void setup_work_tree(void)
 
 static int check_repository_format_gently(int *nongit_ok)
 {
-       git_config(check_repository_format_version);
+       git_config(check_repository_format_version, NULL);
        if (GIT_REPO_VERSION < repository_format_version) {
                if (!nongit_ok)
                        die ("Expected git repo version <= %d, found %d",
@@ -314,6 +314,44 @@ static int check_repository_format_gently(int *nongit_ok)
        return 0;
 }
 
+/*
+ * Try to read the location of the git directory from the .git file,
+ * return path to git directory if found.
+ */
+const char *read_gitfile_gently(const char *path)
+{
+       char *buf;
+       struct stat st;
+       int fd;
+       size_t len;
+
+       if (stat(path, &st))
+               return NULL;
+       if (!S_ISREG(st.st_mode))
+               return NULL;
+       fd = open(path, O_RDONLY);
+       if (fd < 0)
+               die("Error opening %s: %s", path, strerror(errno));
+       buf = xmalloc(st.st_size + 1);
+       len = read_in_full(fd, buf, st.st_size);
+       close(fd);
+       if (len != st.st_size)
+               die("Error reading %s", path);
+       buf[len] = '\0';
+       if (prefixcmp(buf, "gitdir: "))
+               die("Invalid gitfile format: %s", path);
+       while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
+               len--;
+       if (len < 9)
+               die("No path in gitfile: %s", path);
+       buf[len] = '\0';
+       if (!is_git_directory(buf + 8))
+               die("Not a git repository: %s", buf + 8);
+       path = make_absolute_path(buf + 8);
+       free(buf);
+       return path;
+}
+
 /*
  * We cannot decide in this function whether we are in the work tree or
  * not, since the config can only be read _after_ this function was called.
@@ -323,6 +361,7 @@ const char *setup_git_directory_gently(int *nongit_ok)
        const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
        static char cwd[PATH_MAX+1];
        const char *gitdirenv;
+       const char *gitfile_dir;
        int len, offset;
 
        /*
@@ -377,8 +416,10 @@ const char *setup_git_directory_gently(int *nongit_ok)
 
        /*
         * Test in the following order (relative to the cwd):
+        * - .git (file containing "gitdir: <path>")
         * - .git/
         * - ./ (bare)
+        * - ../.git
         * - ../.git/
         * - ../ (bare)
         * - ../../.git/
@@ -386,6 +427,12 @@ const char *setup_git_directory_gently(int *nongit_ok)
         */
        offset = len = strlen(cwd);
        for (;;) {
+               gitfile_dir = read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT);
+               if (gitfile_dir) {
+                       if (set_git_dir(gitfile_dir))
+                               die("Repository setup failed");
+                       break;
+               }
                if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
                        break;
                if (is_git_directory(".")) {
@@ -477,7 +524,7 @@ int git_config_perm(const char *var, const char *value)
        return i & 0666;
 }
 
-int check_repository_format_version(const char *var, const char *value)
+int check_repository_format_version(const char *var, const char *value, void *cb)
 {
        if (strcmp(var, "core.repositoryformatversion") == 0)
                repository_format_version = git_config_int(var, value);