Introduce option to use relative paths for repository work directoryjamill/relative_gitlink

Teach git_repository_init_ext to use relative paths for the gitlink
to the work directory. This is used when creating a sub repository
where the sub repository resides in the parent repository's
.git directory.

2 files changed, 97 insertions, 41 deletions

diff --git a/src/repository.c b/src/repository.c
index 4f7a5feab..d86d8905a 100644
--- a/src/repository.c
+++ b/src/repository.c
@@ -994,7 +994,7 @@ static int repo_init_config(
 	uint32_t mode)
 {
 	int error = 0;
-	git_buf cfg_path = GIT_BUF_INIT;
+	git_buf cfg_path = GIT_BUF_INIT, worktree_path = GIT_BUF_INIT;
 	git_config *config = NULL;
 	bool is_bare = ((flags & GIT_REPOSITORY_INIT_BARE) != 0);
 	bool is_reinit = ((flags & GIT_REPOSITORY_INIT__IS_REINIT) != 0);
@@ -1019,9 +1019,16 @@ static int repo_init_config(
 	if (!is_bare) {
 		SET_REPO_CONFIG(bool, "core.logallrefupdates", true);
 
-		if (!(flags & GIT_REPOSITORY_INIT__NATURAL_WD))
-			SET_REPO_CONFIG(string, "core.worktree", work_dir);
-		else if (is_reinit) {
+		if (!(flags & GIT_REPOSITORY_INIT__NATURAL_WD)) {
+			if ((error = git_buf_sets(&worktree_path, work_dir)) < 0)
+				goto cleanup;
+
+			if ((flags & GIT_REPOSITORY_INIT_RELATIVE_GITLINK))
+				if ((error = git_path_make_relative(&worktree_path, repo_dir)) < 0)
+					goto cleanup;
+
+			SET_REPO_CONFIG(string, "core.worktree", worktree_path.ptr);
+		} else if (is_reinit) {
 			if (git_config_delete_entry(config, "core.worktree") < 0)
 				giterr_clear();
 		}
@@ -1038,6 +1045,7 @@ static int repo_init_config(
 
 cleanup:
 	git_buf_free(&cfg_path);
+	git_buf_free(&worktree_path);
 	git_config_free(config);
 
 	return error;
@@ -1126,10 +1134,11 @@ static int repo_write_template(
 }
 
 static int repo_write_gitlink(
-	const char *in_dir, const char *to_repo)
+	const char *in_dir, const char *to_repo, bool use_relative_path)
 {
 	int error;
 	git_buf buf = GIT_BUF_INIT;
+	git_buf path_to_repo = GIT_BUF_INIT;
 	struct stat st;
 
 	git_path_dirname_r(&buf, to_repo);
@@ -1157,13 +1166,20 @@ static int repo_write_gitlink(
 
 	git_buf_clear(&buf);
 
-	error = git_buf_printf(&buf, "%s %s", GIT_FILE_CONTENT_PREFIX, to_repo);
+	error = git_buf_sets(&path_to_repo, to_repo);
+
+	if (!error && use_relative_path)
+		error = git_path_make_relative(&path_to_repo, in_dir);
+
+	if (!error)
+		error = git_buf_join(&buf, ' ', GIT_FILE_CONTENT_PREFIX, path_to_repo.ptr);
 
 	if (!error)
 		error = repo_write_template(in_dir, true, DOT_GIT, 0666, true, buf.ptr);
 
 cleanup:
 	git_buf_free(&buf);
+	git_buf_free(&path_to_repo);
 	return error;
 }
 
@@ -1207,7 +1223,7 @@ static int repo_init_structure(
 	if ((opts->flags & GIT_REPOSITORY_INIT_BARE) == 0 &&
 		(opts->flags & GIT_REPOSITORY_INIT__NATURAL_WD) == 0)
 	{
-		if (repo_write_gitlink(work_dir, repo_dir) < 0)
+		if (repo_write_gitlink(work_dir, repo_dir, opts->flags & GIT_REPOSITORY_INIT_RELATIVE_GITLINK) < 0)
 			return -1;
 	}
 
@@ -1635,7 +1651,7 @@ int git_repository_set_workdir(
 		if (git_repository_config__weakptr(&config, repo) < 0)
 			return -1;
 
-		error = repo_write_gitlink(path.ptr, git_repository_path(repo));
+		error = repo_write_gitlink(path.ptr, git_repository_path(repo), false);
 
 		/* passthrough error means gitlink is unnecessary */
 		if (error == GIT_PASSTHROUGH)
diff --git a/src/submodule.c b/src/submodule.c
index b1291df8e..ccc8ad117 100644
--- a/src/submodule.c
+++ b/src/submodule.c
@@ -306,6 +306,56 @@ void git_submodule_cache_free(git_repository *repo)
 		submodule_cache_free(cache);
 }
 
+static int submodule_repo_init(
+	git_repository **out,
+	git_repository *parent_repo,
+	const char *path,
+	const char *url,
+	bool use_gitlink)
+{
+	int error = 0;
+	git_buf workdir = GIT_BUF_INIT, repodir = GIT_BUF_INIT;
+	git_repository_init_options initopt = GIT_REPOSITORY_INIT_OPTIONS_INIT;
+	git_repository *subrepo = NULL;
+
+	error = git_buf_joinpath(&workdir, git_repository_workdir(parent_repo), path);
+	if (error < 0)
+		goto cleanup;
+
+	initopt.flags = GIT_REPOSITORY_INIT_MKPATH | GIT_REPOSITORY_INIT_NO_REINIT;
+	initopt.origin_url = url;
+
+	/* init submodule repository and add origin remote as needed */
+
+	/* New style: sub-repo goes in <repo-dir>/modules/<name>/ with a
+	 * gitlink in the sub-repo workdir directory to that repository
+	 *
+	 * Old style: sub-repo goes directly into repo/<name>/.git/
+	 */
+	 if (use_gitlink) {
+		error = git_buf_join3(
+			&repodir, '/', git_repository_path(parent_repo), "modules", path);
+		if (error < 0)
+			goto cleanup;
+
+		initopt.workdir_path = workdir.ptr;
+		initopt.flags |=
+			GIT_REPOSITORY_INIT_NO_DOTGIT_DIR |
+			GIT_REPOSITORY_INIT_RELATIVE_GITLINK;
+
+		error = git_repository_init_ext(&subrepo, repodir.ptr, &initopt);
+	} else
+		error = git_repository_init_ext(&subrepo, workdir.ptr, &initopt);
+
+cleanup:
+	git_buf_free(&workdir);
+	git_buf_free(&repodir);
+
+	*out = subrepo;
+
+	return error;
+}
+
 int git_submodule_add_setup(
 	git_submodule **out,
 	git_repository *repo,
@@ -317,7 +367,6 @@ int git_submodule_add_setup(
 	git_config_backend *mods = NULL;
 	git_submodule *sm = NULL;
 	git_buf name = GIT_BUF_INIT, real_url = GIT_BUF_INIT;
-	git_repository_init_options initopt = GIT_REPOSITORY_INIT_OPTIONS_INIT;
 	git_repository *subrepo = NULL;
 
 	assert(repo && url && path);
@@ -371,41 +420,14 @@ int git_submodule_add_setup(
 	if (error < 0)
 		goto cleanup;
 
-	/* New style: sub-repo goes in <repo-dir>/modules/<name>/ with a
-	 * gitlink in the sub-repo workdir directory to that repository
-	 *
-	 * Old style: sub-repo goes directly into repo/<name>/.git/
+	/* if the repo does not already exist, then init a new repo and add it.
+	 * Otherwise, just add the existing repo.
 	 */
-
-	initopt.flags = GIT_REPOSITORY_INIT_MKPATH |
-		GIT_REPOSITORY_INIT_NO_REINIT;
-	initopt.origin_url = real_url.ptr;
-
-	if (git_path_exists(name.ptr) &&
-		git_path_contains(&name, DOT_GIT))
-	{
-		/* repo appears to already exist - reinit? */
-	}
-	else if (use_gitlink) {
-		git_buf repodir = GIT_BUF_INIT;
-
-		error = git_buf_join3(
-			&repodir, '/', git_repository_path(repo), "modules", path);
-		if (error < 0)
+	if (!(git_path_exists(name.ptr) &&
+		git_path_contains(&name, DOT_GIT))) {
+		if ((error = submodule_repo_init(&subrepo, repo, path, real_url.ptr, use_gitlink)) < 0)
 			goto cleanup;
-
-		initopt.workdir_path = name.ptr;
-		initopt.flags |= GIT_REPOSITORY_INIT_NO_DOTGIT_DIR;
-
-		error = git_repository_init_ext(&subrepo, repodir.ptr, &initopt);
-
-		git_buf_free(&repodir);
 	}
-	else {
-		error = git_repository_init_ext(&subrepo, name.ptr, &initopt);
-	}
-	if (error < 0)
-		goto cleanup;
 
 	/* add submodule to hash and "reload" it */
 
@@ -437,6 +459,23 @@ cleanup:
 	return error;
 }
 
+int git_submodule_repo_init(
+	git_repository **out,
+	const git_submodule *sm,
+	int use_gitlink)
+{
+	int error;
+	git_repository *sub_repo = NULL;
+
+	assert(out && sm);
+
+	error = submodule_repo_init(&sub_repo, sm->repo, sm->path, sm->url, use_gitlink);
+
+	*out = sub_repo;
+
+	return error;
+}
+
 int git_submodule_add_finalize(git_submodule *sm)
 {
 	int error;
@@ -1897,6 +1936,7 @@ static void submodule_get_index_status(unsigned int *status, git_submodule *sm)
 		*status |= GIT_SUBMODULE_STATUS_INDEX_MODIFIED;
 }
 
+
 static void submodule_get_wd_status(
 	unsigned int *status,
 	git_submodule *sm,