setup_git_env: avoid blind fall-back to ".git"

diff --git a/environment.c b/environment.c
index cd5aa57179240d615cb0628c9e24f44ac4b8c2d3..6a8e0c2d1b23e67a17158fc995c2acdc4a954c8d 100644 (file)
--- a/environment.c
+++ b/environment.c
@@ -99,6 +99,8 @@ static char *work_tree;
 static const char *namespace;
 static size_t namespace_len;
 
+static const char *super_prefix;
+
 static const char *git_dir, *git_common_dir;
 static char *git_object_dir, *git_index_file, *git_graft_file;
 int git_db_env, git_index_env, git_graft_env, git_common_dir_env;
@@ -119,6 +121,7 @@ const char * const local_repo_env[] = {
        NO_REPLACE_OBJECTS_ENVIRONMENT,
        GIT_REPLACE_REF_BASE_ENVIRONMENT,
        GIT_PREFIX_ENVIRONMENT,
+       GIT_SUPER_PREFIX_ENVIRONMENT,
        GIT_SHALLOW_FILE_ENVIRONMENT,
        GIT_COMMON_DIR_ENVIRONMENT,
        NULL
@@ -164,8 +167,11 @@ static void setup_git_env(void)
        const char *replace_ref_base;
 
        git_dir = getenv(GIT_DIR_ENVIRONMENT);
-       if (!git_dir)
+       if (!git_dir) {
+               if (!startup_info->have_repository)
+                       die("BUG: setup_git_env called without repository");
                git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
+       }
        gitfile = read_gitfile(git_dir);
        git_dir = xstrdup(gitfile ? gitfile : git_dir);
        if (get_common_dir(&sb, git_dir))
@@ -228,6 +234,16 @@ const char *strip_namespace(const char *namespaced_ref)
        return namespaced_ref + namespace_len;
 }
 
+const char *get_super_prefix(void)
+{
+       static int initialized;
+       if (!initialized) {
+               super_prefix = getenv(GIT_SUPER_PREFIX_ENVIRONMENT);
+               initialized = 1;
+       }
+       return super_prefix;
+}
+
 static int git_work_tree_initialized;
 
 /*