X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=setup.c;h=c487d7eb9de70c651ef06a6bfd4a7571337fad84;hb=6d0de319d6249096fe934317e937177d07b1b84f;hp=b8789de5c523d72110187960fb887852732f8486;hpb=828cc617c1908a16b36734f62bb10299c2cfba6f;p=git.git

diff --git a/setup.c b/setup.c
index b8789de5..c487d7eb 100644
--- a/setup.c
+++ b/setup.c
@@ -1,8 +1,8 @@
 #include "cache.h"
 
-char *prefix_path(const char *prefix, int len, char *path)
+const char *prefix_path(const char *prefix, int len, const char *path)
 {
-	char *orig = path;
+	const char *orig = path;
 	for (;;) {
 		char c;
 		if (*path != '.')
@@ -47,10 +47,10 @@ char *prefix_path(const char *prefix, int len, char *path)
 	return path;
 }
 
-const char **get_pathspec(const char *prefix, char **pathspec)
+const char **get_pathspec(const char *prefix, const char **pathspec)
 {
-	char *entry = *pathspec;
-	char **p;
+	const char *entry = *pathspec;
+	const char **p;
 	int prefixlen;
 
 	if (!prefix && !entry)
@@ -72,6 +72,26 @@ const char **get_pathspec(const char *prefix, char **pathspec)
 	return (const char **) pathspec;
 }
 
+/*
+ * Test it it looks like we're at the top
+ * level git directory. We want to see a
+ *
+ *  - either a .git/objects/ directory _or_ the proper
+ *    GIT_OBJECT_DIRECTORY environment variable
+ *  - a refs/ directory under ".git"
+ *  - either a HEAD symlink or a HEAD file that is formatted as
+ *    a proper "ref:".
+ */
+static int is_toplevel_directory(void)
+{
+	if (access(".git/refs/", X_OK) ||
+	    access(getenv(DB_ENVIRONMENT) ?
+		   getenv(DB_ENVIRONMENT) : ".git/objects/", X_OK) ||
+	    validate_symref(".git/HEAD"))
+		return 0;
+	return 1;
+}
+
 const char *setup_git_directory(void)
 {
 	static char cwd[PATH_MAX+1];
@@ -81,7 +101,7 @@ const char *setup_git_directory(void)
 	 * If GIT_DIR is set explicitly, we're not going
 	 * to do any discovery
 	 */
-	if (gitenv(GIT_DIR_ENVIRONMENT))
+	if (getenv(GIT_DIR_ENVIRONMENT))
 		return NULL;
 
 	if (!getcwd(cwd, sizeof(cwd)) || cwd[0] != '/')
@@ -89,17 +109,8 @@ const char *setup_git_directory(void)
 
 	offset = len = strlen(cwd);
 	for (;;) {
-		/*
-		 * We always want to see a .git/refs/ subdirectory
-		 */
-		if (!access(".git/refs/", X_OK)) {
-			/*
-			 * Then we need either a GIT_OBJECT_DIRECTORY define
-			 * or a .git/objects/ directory
-			 */
-			if (gitenv(DB_ENVIRONMENT) || !access(".git/objects/", X_OK))
-				break;
-		}
+		if (is_toplevel_directory())
+			break;
 		chdir("..");
 		do {
 			if (!offset)