environment: add GIT_PREFIX to local_repo_env

[~andy/git] / setup.c

diff --git a/setup.c b/setup.c
index f108c4b990c0e4f6a98c1fe34d3031040c84195a..d0e3ecdcd4222a3287cbca9b48f9fa04ca4765a8 100644 (file)
--- a/setup.c
+++ b/setup.c
@@ -624,22 +624,32 @@ static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_
 /*
  * A "string_list_each_func_t" function that canonicalizes an entry
  * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
- * discards it if unusable.
+ * discards it if unusable.  The presence of an empty entry in
+ * GIT_CEILING_DIRECTORIES turns off canonicalization for all
+ * subsequent entries.
  */
 static int canonicalize_ceiling_entry(struct string_list_item *item,
-                                     void *unused)
+                                     void *cb_data)
 {
+       int *empty_entry_found = cb_data;
        char *ceil = item->string;
-       const char *real_path;
 
-       if (!*ceil || !is_absolute_path(ceil))
+       if (!*ceil) {
+               *empty_entry_found = 1;
                return 0;
-       real_path = real_path_if_valid(ceil);
-       if (!real_path)
+       } else if (!is_absolute_path(ceil)) {
                return 0;
-       free(item->string);
-       item->string = xstrdup(real_path);
-       return 1;
+       } else if (*empty_entry_found) {
+               /* Keep entry but do not canonicalize it */
+               return 1;
+       } else {
+               const char *real_path = real_path_if_valid(ceil);
+               if (!real_path)
+                       return 0;
+               free(item->string);
+               item->string = xstrdup(real_path);
+               return 1;
+       }
 }
 
 /*
@@ -679,9 +689,11 @@ static const char *setup_git_directory_gently_1(int *nongit_ok)
                return setup_explicit_git_dir(gitdirenv, cwd, len, nongit_ok);
 
        if (env_ceiling_dirs) {
+               int empty_entry_found = 0;
+
                string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
                filter_string_list(&ceiling_dirs, 0,
-                                  canonicalize_ceiling_entry, NULL);
+                                  canonicalize_ceiling_entry, &empty_entry_found);
                ceil_offset = longest_ancestor_length(cwd, &ceiling_dirs);
                string_list_clear(&ceiling_dirs, 0);
        }
@@ -756,9 +768,9 @@ const char *setup_git_directory_gently(int *nongit_ok)
 
        prefix = setup_git_directory_gently_1(nongit_ok);
        if (prefix)
-               setenv("GIT_PREFIX", prefix, 1);
+               setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
        else
-               setenv("GIT_PREFIX", "", 1);
+               setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
 
        if (startup_info) {
                startup_info->have_repository = !nongit_ok || !*nongit_ok;