object-file: move mkdir_in_gitdir() into "path.c"

The `mkdir_in_gitdir()` function is similar to `safe_create_dir()`, but
the former is hosted in "object-file.c" whereas the latter is hosted in
"path.c". The latter code unit makes way more sense though as the logic
has nothing to do with object files in particular.

Move the file into "path.c". While at it, we:

  - Rename the function to `safe_create_dir_in_gitdir()` so that the
    function names are similar to one another.

  - Remove the dependency on `the_repository` by making the callers pass
    the repository instead.

Adjust callers accordingly.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/rebase.c

@@ -267,7 +267,8 @@ static int init_basic_state(struct replay_opts *opts, const char *head_name,
 {
 	FILE *interactive;
 
-	if (!is_directory(merge_dir()) && mkdir_in_gitdir(merge_dir()))
+	if (!is_directory(merge_dir()) &&
+	    safe_create_dir_in_gitdir(the_repository, merge_dir()))
 		return error_errno(_("could not create temporary %s"), merge_dir());
 
 	refs_delete_reflog(get_main_ref_store(the_repository), "REBASE_HEAD");

object-file.c

@@ -90,36 +90,6 @@ static int get_conv_flags(unsigned flags)
 		return 0;
 }
 
-
-int mkdir_in_gitdir(const char *path)
-{
-	if (mkdir(path, 0777)) {
-		int saved_errno = errno;
-		struct stat st;
-		struct strbuf sb = STRBUF_INIT;
-
-		if (errno != EEXIST)
-			return -1;
-		/*
-		 * Are we looking at a path in a symlinked worktree
-		 * whose original repository does not yet have it?
-		 * e.g. .git/rr-cache pointing at its original
-		 * repository in which the user hasn't performed any
-		 * conflict resolution yet?
-		 */
-		if (lstat(path, &st) || !S_ISLNK(st.st_mode) ||
-		    strbuf_readlink(&sb, path, st.st_size) ||
-		    !is_absolute_path(sb.buf) ||
-		    mkdir(sb.buf, 0777)) {
-			strbuf_release(&sb);
-			errno = saved_errno;
-			return -1;
-		}
-		strbuf_release(&sb);
-	}
-	return adjust_shared_perm(the_repository, path);
-}
-
 static enum scld_error safe_create_leading_directories_1(char *path, int share)
 {
 	char *next_component = path + offset_1st_component(path);
@@ -2196,7 +2166,8 @@ int stream_loose_object(struct input_stream *in_stream, size_t len,
 		struct strbuf dir = STRBUF_INIT;
 		strbuf_add(&dir, filename.buf, dirlen);
 
-		if (mkdir_in_gitdir(dir.buf) && errno != EEXIST) {
+		if (safe_create_dir_in_gitdir(the_repository, dir.buf) &&
+		    errno != EEXIST) {
 			err = error_errno(_("unable to create directory %s"), dir.buf);
 			strbuf_release(&dir);
 			goto cleanup;

object-file.h

@@ -54,8 +54,6 @@ enum scld_error safe_create_leading_directories(char *path);
 enum scld_error safe_create_leading_directories_const(const char *path);
 enum scld_error safe_create_leading_directories_no_share(char *path);
 
-int mkdir_in_gitdir(const char *path);
-
 int git_open_cloexec(const char *name, int flags);
 #define git_open(name) git_open_cloexec(name, O_RDONLY)
 

path.c

@@ -902,6 +902,35 @@ void safe_create_dir(struct repository *repo, const char *dir, int share)
 		die(_("Could not make %s writable by group"), dir);
 }
 
+int safe_create_dir_in_gitdir(struct repository *repo, const char *path)
+{
+	if (mkdir(path, 0777)) {
+		int saved_errno = errno;
+		struct stat st;
+		struct strbuf sb = STRBUF_INIT;
+
+		if (errno != EEXIST)
+			return -1;
+		/*
+		 * Are we looking at a path in a symlinked worktree
+		 * whose original repository does not yet have it?
+		 * e.g. .git/rr-cache pointing at its original
+		 * repository in which the user hasn't performed any
+		 * conflict resolution yet?
+		 */
+		if (lstat(path, &st) || !S_ISLNK(st.st_mode) ||
+		    strbuf_readlink(&sb, path, st.st_size) ||
+		    !is_absolute_path(sb.buf) ||
+		    mkdir(sb.buf, 0777)) {
+			strbuf_release(&sb);
+			errno = saved_errno;
+			return -1;
+		}
+		strbuf_release(&sb);
+	}
+	return adjust_shared_perm(repo, path);
+}
+
 static int have_same_root(const char *path1, const char *path2)
 {
 	int is_abs1, is_abs2;

path.h

@@ -221,6 +221,17 @@ char *xdg_cache_home(const char *filename);
  */
 void safe_create_dir(struct repository *repo, const char *dir, int share);
 
+/*
+ * Similar to `safe_create_dir()`, but with two differences:
+ *
+ *   - It knows to resolve gitlink files for symlinked worktrees.
+ *
+ *   - It always adjusts shared permissions.
+ *
+ * Returns a negative erorr code on error, 0 on success.
+ */
+int safe_create_dir_in_gitdir(struct repository *repo, const char *path);
+
 # ifdef USE_THE_REPOSITORY_VARIABLE
 #  include "strbuf.h"
 #  include "repository.h"

rerere.c

@@ -860,7 +860,7 @@ static int do_plain_rerere(struct repository *r,
 		string_list_insert(rr, path)->util = id;
 
 		/* Ensure that the directory exists. */
-		mkdir_in_gitdir(rerere_path(&buf, id, NULL));
+		safe_create_dir_in_gitdir(the_repository, rerere_path(&buf, id, NULL));
 	}
 
 	for (i = 0; i < rr->nr; i++)
@@ -895,7 +895,8 @@ static int is_rerere_enabled(void)
 	if (rerere_enabled < 0)
 		return rr_cache_exists;
 
-	if (!rr_cache_exists && mkdir_in_gitdir(git_path_rr_cache()))
+	if (!rr_cache_exists &&
+	    safe_create_dir_in_gitdir(the_repository, git_path_rr_cache()))
 		die(_("could not create directory '%s'"), git_path_rr_cache());
 	return 1;
 }