Add support for GIT_CEILING_DIRECTORIES

diff --git a/setup.c b/setup.c
index b8fd476395db782bf942a548b87242b3a9f990f4..c14b10636faed05a47b4fb755768c4650a1ead76 100644 (file)
--- a/setup.c
+++ b/setup.c
@@ -359,10 +359,11 @@ const char *read_gitfile_gently(const char *path)
 const char *setup_git_directory_gently(int *nongit_ok)
 {
        const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
+       const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
        static char cwd[PATH_MAX+1];
        const char *gitdirenv;
        const char *gitfile_dir;
-       int len, offset;
+       int len, offset, ceil_offset;
 
        /*
         * Let's assume that we are in a git repository.
@@ -414,6 +415,8 @@ const char *setup_git_directory_gently(int *nongit_ok)
        if (!getcwd(cwd, sizeof(cwd)-1))
                die("Unable to read current working directory");
 
+       ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs);
+
        /*
         * Test in the following order (relative to the cwd):
         * - .git (file containing "gitdir: <path>")
@@ -444,17 +447,16 @@ const char *setup_git_directory_gently(int *nongit_ok)
                        return NULL;
                }
                chdir("..");
-               do {
-                       if (!offset) {
-                               if (nongit_ok) {
-                                       if (chdir(cwd))
-                                               die("Cannot come back to cwd");
-                                       *nongit_ok = 1;
-                                       return NULL;
-                               }
-                               die("Not a git repository");
+               while (--offset > ceil_offset && cwd[offset] != '/');
+               if (offset <= ceil_offset) {
+                       if (nongit_ok) {
+                               if (chdir(cwd))
+                                       die("Cannot come back to cwd");
+                               *nongit_ok = 1;
+                               return NULL;
                        }
-               } while (cwd[--offset] != '/');
+                       die("Not a git repository");
+               }
        }
 
        inside_git_dir = 0;