Merge branch 'vd/worktree-config-is-per-repository'

The value of config.worktree is per-repository, but has been kept
in a singleton global variable per process. This has been OK as
most Git operations interacted with a single repository at a time,
but not right for operations like recursive "grep" that want to
access multiple repositories from a single process without forking.

The global variable has been eliminated and made into a member in
the per-repository data structure.

* vd/worktree-config-is-per-repository:
  repository: move 'repository_format_worktree_config' to repo scope
  config: pass 'repo' directly to 'config_with_options()'
  config: use gitdir to get worktree config

13 files changed, 102 insertions, 37 deletions

diff --git a/builtin/config.c b/builtin/config.c
index ff2fe8ef12..d40fddb042 100644
--- a/builtin/config.c
+++ b/builtin/config.c
@@ -5,6 +5,7 @@
 #include "color.h"
 #include "editor.h"
 #include "environment.h"
+#include "repository.h"
 #include "gettext.h"
 #include "ident.h"
 #include "parse-options.h"
@@ -375,7 +376,8 @@ static int get_value(const char *key_, const char *regex_, unsigned flags)
 	}
 
 	config_with_options(collect_config, &values,
-			    &given_config_source, &config_options);
+			    &given_config_source, the_repository,
+			    &config_options);
 
 	if (!values.nr && default_value) {
 		struct strbuf *item;
@@ -486,7 +488,8 @@ static void get_color(const char *var, const char *def_color)
 	get_color_found = 0;
 	parsed_color[0] = '\0';
 	config_with_options(git_get_color_config, NULL,
-			    &given_config_source, &config_options);
+			    &given_config_source, the_repository,
+			    &config_options);
 
 	if (!get_color_found && def_color) {
 		if (color_parse(def_color, parsed_color) < 0)
@@ -518,7 +521,8 @@ static int get_colorbool(const char *var, int print)
 	get_diff_color_found = -1;
 	get_color_ui_found = -1;
 	config_with_options(git_get_colorbool_config, NULL,
-			    &given_config_source, &config_options);
+			    &given_config_source, the_repository,
+			    &config_options);
 
 	if (get_colorbool_found < 0) {
 		if (!strcmp(get_colorbool_slot, "color.diff"))
@@ -607,7 +611,8 @@ static int get_urlmatch(const char *var, const char *url)
 	}
 
 	config_with_options(urlmatch_config_entry, &config,
-			    &given_config_source, &config_options);
+			    &given_config_source, the_repository,
+			    &config_options);
 
 	ret = !values.nr;
 
@@ -713,7 +718,7 @@ int cmd_config(int argc, const char **argv, const char *prefix)
 		given_config_source.scope = CONFIG_SCOPE_LOCAL;
 	} else if (use_worktree_config) {
 		struct worktree **worktrees = get_worktrees();
-		if (repository_format_worktree_config)
+		if (the_repository->repository_format_worktree_config)
 			given_config_source.file = git_pathdup("config.worktree");
 		else if (worktrees[0] && worktrees[1])
 			die(_("--worktree cannot be used with multiple "
@@ -827,7 +832,7 @@ int cmd_config(int argc, const char **argv, const char *prefix)
 	if (actions == ACTION_LIST) {
 		check_argc(argc, 0, 0);
 		if (config_with_options(show_all_config, NULL,
-					&given_config_source,
+					&given_config_source, the_repository,
 					&config_options) < 0) {
 			if (given_config_source.file)
 				die_errno(_("unable to read config file '%s'"),
diff --git a/builtin/worktree.c b/builtin/worktree.c
index f3180463be..60e389aaed 100644
--- a/builtin/worktree.c
+++ b/builtin/worktree.c
@@ -483,7 +483,7 @@ static int add_worktree(const char *path, const char *refname,
 	 * values from the current worktree into the new one, that way the
 	 * new worktree behaves the same as this one.
 	 */
-	if (repository_format_worktree_config)
+	if (the_repository->repository_format_worktree_config)
 		copy_filtered_worktree_config(sb_repo.buf);
 
 	strvec_pushf(&child_env, "%s=%s", GIT_DIR_ENVIRONMENT, sb_git.buf);
diff --git a/config.c b/config.c
index b79baf83e3..f5bdac0aee 100644
--- a/config.c
+++ b/config.c
@@ -199,6 +199,7 @@ struct config_include_data {
 	void *data;
 	const struct config_options *opts;
 	struct git_config_source *config_source;
+	struct repository *repo;
 	struct config_reader *config_reader;
 
 	/*
@@ -415,7 +416,8 @@ static void populate_remote_urls(struct config_include_data *inc)
 
 	inc->remote_urls = xmalloc(sizeof(*inc->remote_urls));
 	string_list_init_dup(inc->remote_urls);
-	config_with_options(add_remote_url, inc->remote_urls, inc->config_source, &opts);
+	config_with_options(add_remote_url, inc->remote_urls,
+			    inc->config_source, inc->repo, &opts);
 
 	config_reader_set_scope(inc->config_reader, store_scope);
 }
@@ -2193,6 +2195,7 @@ int git_config_system(void)
 
 static int do_git_config_sequence(struct config_reader *reader,
 				  const struct config_options *opts,
+				  const struct repository *repo,
 				  config_fn_t fn, void *data)
 {
 	int ret = 0;
@@ -2200,14 +2203,24 @@ static int do_git_config_sequence(struct config_reader *reader,
 	char *xdg_config = NULL;
 	char *user_config = NULL;
 	char *repo_config;
+	char *worktree_config;
 	enum config_scope prev_parsing_scope = reader->parsing_scope;
 
-	if (opts->commondir)
+	/*
+	 * Ensure that either:
+	 * - the git_dir and commondir are both set, or
+	 * - the git_dir and commondir are both NULL
+	 */
+	if (!opts->git_dir != !opts->commondir)
+		BUG("only one of commondir and git_dir is non-NULL");
+
+	if (opts->commondir) {
 		repo_config = mkpathdup("%s/config", opts->commondir);
-	else if (opts->git_dir)
-		BUG("git_dir without commondir");
-	else
+		worktree_config = mkpathdup("%s/config.worktree", opts->git_dir);
+	} else {
 		repo_config = NULL;
+		worktree_config = NULL;
+	}
 
 	config_reader_set_scope(reader, CONFIG_SCOPE_SYSTEM);
 	if (git_config_system() && system_config &&
@@ -2230,11 +2243,10 @@ static int do_git_config_sequence(struct config_reader *reader,
 		ret += git_config_from_file(fn, repo_config, data);
 
 	config_reader_set_scope(reader, CONFIG_SCOPE_WORKTREE);
-	if (!opts->ignore_worktree && repository_format_worktree_config) {
-		char *path = git_pathdup("config.worktree");
-		if (!access_or_die(path, R_OK, 0))
-			ret += git_config_from_file(fn, path, data);
-		free(path);
+	if (!opts->ignore_worktree && worktree_config &&
+	    repo && repo->repository_format_worktree_config &&
+	    !access_or_die(worktree_config, R_OK, 0)) {
+		ret += git_config_from_file(fn, worktree_config, data);
 	}
 
 	config_reader_set_scope(reader, CONFIG_SCOPE_COMMAND);
@@ -2246,11 +2258,13 @@ static int do_git_config_sequence(struct config_reader *reader,
 	free(xdg_config);
 	free(user_config);
 	free(repo_config);
+	free(worktree_config);
 	return ret;
 }
 
 int config_with_options(config_fn_t fn, void *data,
 			struct git_config_source *config_source,
+			struct repository *repo,
 			const struct config_options *opts)
 {
 	struct config_include_data inc = CONFIG_INCLUDE_INIT;
@@ -2261,6 +2275,7 @@ int config_with_options(config_fn_t fn, void *data,
 		inc.fn = fn;
 		inc.data = data;
 		inc.opts = opts;
+		inc.repo = repo;
 		inc.config_source = config_source;
 		inc.config_reader = &the_reader;
 		fn = git_config_include;
@@ -2279,12 +2294,10 @@ int config_with_options(config_fn_t fn, void *data,
 	} else if (config_source && config_source->file) {
 		ret = git_config_from_file(fn, config_source->file, data);
 	} else if (config_source && config_source->blob) {
-		struct repository *repo = config_source->repo ?
-			config_source->repo : the_repository;
 		ret = git_config_from_blob_ref(fn, repo, config_source->blob,
 						data);
 	} else {
-		ret = do_git_config_sequence(&the_reader, opts, fn, data);
+		ret = do_git_config_sequence(&the_reader, opts, repo, fn, data);
 	}
 
 	if (inc.remote_urls) {
@@ -2343,7 +2356,7 @@ void read_early_config(config_fn_t cb, void *data)
 		opts.git_dir = gitdir.buf;
 	}
 
-	config_with_options(cb, data, NULL, &opts);
+	config_with_options(cb, data, NULL, NULL, &opts);
 
 	strbuf_release(&commondir);
 	strbuf_release(&gitdir);
@@ -2363,7 +2376,7 @@ void read_very_early_config(config_fn_t cb, void *data)
 	opts.ignore_cmdline = 1;
 	opts.system_gently = 1;
 
-	config_with_options(cb, data, NULL, &opts);
+	config_with_options(cb, data, NULL, NULL, &opts);
 }
 
 RESULT_MUST_BE_USED
@@ -2671,7 +2684,7 @@ static void repo_read_config(struct repository *repo)
 	data.config_set = repo->config;
 	data.config_reader = &the_reader;
 
-	if (config_with_options(config_set_callback, &data, NULL, &opts) < 0)
+	if (config_with_options(config_set_callback, &data, NULL, repo, &opts) < 0)
 		/*
 		 * config_with_options() normally returns only
 		 * zero, as most errors are fatal, and
@@ -2815,7 +2828,7 @@ static void read_protected_config(void)
 	git_configset_init(&protected_config);
 	data.config_set = &protected_config;
 	data.config_reader = &the_reader;
-	config_with_options(config_set_callback, &data, NULL, &opts);
+	config_with_options(config_set_callback, &data, NULL, NULL, &opts);
 }
 
 void git_protected_config(config_fn_t fn, void *data)
@@ -3327,7 +3340,7 @@ int repo_config_set_worktree_gently(struct repository *r,
 				    const char *key, const char *value)
 {
 	/* Only use worktree-specific config if it is already enabled. */
-	if (repository_format_worktree_config) {
+	if (r->repository_format_worktree_config) {
 		char *file = repo_git_path(r, "config.worktree");
 		int ret = git_config_set_multivar_in_file_gently(
 					file, key, value, NULL, 0);
diff --git a/config.h b/config.h
index 247b572b37..d1c5577589 100644
--- a/config.h
+++ b/config.h
@@ -3,6 +3,7 @@
 
 #include "hashmap.h"
 #include "string-list.h"
+#include "repository.h"
 
 
 /**
@@ -49,8 +50,6 @@ const char *config_scope_name(enum config_scope scope);
 struct git_config_source {
 	unsigned int use_stdin:1;
 	const char *file;
-	/* The repository if blob is not NULL; leave blank for the_repository */
-	struct repository *repo;
 	const char *blob;
 	enum config_scope scope;
 };
@@ -196,6 +195,7 @@ void git_config(config_fn_t fn, void *);
  */
 int config_with_options(config_fn_t fn, void *,
 			struct git_config_source *config_source,
+			struct repository *repo,
 			const struct config_options *opts);
 
 /**
diff --git a/environment.c b/environment.c
index 28d18eaca8..6bd001efbd 100644
--- a/environment.c
+++ b/environment.c
@@ -42,7 +42,6 @@ int is_bare_repository_cfg = -1; /* unspecified */
 int warn_ambiguous_refs = 1;
 int warn_on_object_refname_ambiguity = 1;
 int repository_format_precious_objects;
-int repository_format_worktree_config;
 const char *git_commit_encoding;
 const char *git_log_output_encoding;
 char *apply_default_whitespace;
diff --git a/environment.h b/environment.h
index 30cb7e0fa3..e666807926 100644
--- a/environment.h
+++ b/environment.h
@@ -197,7 +197,6 @@ extern char *notes_ref_name;
 extern int grafts_replace_parents;
 
 extern int repository_format_precious_objects;
-extern int repository_format_worktree_config;
 
 /*
  * Create a temporary file rooted in the object database directory, or
diff --git a/repository.c b/repository.c
index c53e480e32..104960f8f5 100644
--- a/repository.c
+++ b/repository.c
@@ -182,6 +182,7 @@ int repo_init(struct repository *repo,
 		goto error;
 
 	repo_set_hash_algo(repo, format.hash_algo);
+	repo->repository_format_worktree_config = format.worktree_config;
 
 	/* take ownership of format.partial_clone */
 	repo->repository_format_partial_clone = format.partial_clone;
diff --git a/repository.h b/repository.h
index 1a13ff2867..74ae26635a 100644
--- a/repository.h
+++ b/repository.h
@@ -163,6 +163,7 @@ struct repository {
 	struct promisor_remote_config *promisor_remote_config;
 
 	/* Configurations */
+	int repository_format_worktree_config;
 
 	/* Indicate if a repository has a different 'commondir' from 'gitdir' */
 	unsigned different_commondir:1;
diff --git a/setup.c b/setup.c
index 458582207e..d866395435 100644
--- a/setup.c
+++ b/setup.c
@@ -650,11 +650,10 @@ static int check_repository_format_gently(const char *gitdir, struct repository_
 	}
 
 	repository_format_precious_objects = candidate->precious_objects;
-	repository_format_worktree_config = candidate->worktree_config;
 	string_list_clear(&candidate->unknown_extensions, 0);
 	string_list_clear(&candidate->v1_only_extensions, 0);
 
-	if (repository_format_worktree_config) {
+	if (candidate->worktree_config) {
 		/*
 		 * pick up core.bare and core.worktree from per-worktree
 		 * config if present
@@ -1423,6 +1422,9 @@ int discover_git_directory(struct strbuf *commondir,
 		return -1;
 	}
 
+	the_repository->repository_format_worktree_config =
+		candidate.worktree_config;
+
 	/* take ownership of candidate.partial_clone */
 	the_repository->repository_format_partial_clone =
 		candidate.partial_clone;
@@ -1560,6 +1562,8 @@ const char *setup_git_directory_gently(int *nongit_ok)
 		}
 		if (startup_info->have_repository) {
 			repo_set_hash_algo(the_repository, repo_fmt.hash_algo);
+			the_repository->repository_format_worktree_config =
+				repo_fmt.worktree_config;
 			/* take ownership of repo_fmt.partial_clone */
 			the_repository->repository_format_partial_clone =
 				repo_fmt.partial_clone;
@@ -1651,6 +1655,8 @@ void check_repository_format(struct repository_format *fmt)
 	check_repository_format_gently(get_git_dir(), fmt, NULL);
 	startup_info->have_repository = 1;
 	repo_set_hash_algo(the_repository, fmt->hash_algo);
+	the_repository->repository_format_worktree_config =
+		fmt->worktree_config;
 	the_repository->repository_format_partial_clone =
 		xstrdup_or_null(fmt->partial_clone);
 	clear_repository_format(&repo_fmt);
diff --git a/submodule-config.c b/submodule-config.c
index 58dfbde9ae..7eb7a0d88d 100644
--- a/submodule-config.c
+++ b/submodule-config.c
@@ -659,7 +659,6 @@ static void config_from_gitmodules(config_fn_t fn, struct repository *repo, void
 			config_source.file = file;
 		} else if (repo_get_oid(repo, GITMODULES_INDEX, &oid) >= 0 ||
 			   repo_get_oid(repo, GITMODULES_HEAD, &oid) >= 0) {
-			config_source.repo = repo;
 			config_source.blob = oidstr = xstrdup(oid_to_hex(&oid));
 			if (repo != the_repository)
 				add_submodule_odb_by_path(repo->objects->odb->path);
@@ -667,7 +666,7 @@ static void config_from_gitmodules(config_fn_t fn, struct repository *repo, void
 			goto out;
 		}
 
-		config_with_options(fn, data, &config_source, &opts);
+		config_with_options(fn, data, &config_source, repo, &opts);
 
 out:
 		free(oidstr);
diff --git a/t/t3007-ls-files-recurse-submodules.sh b/t/t3007-ls-files-recurse-submodules.sh
index dd7770e85d..7308a3d4e2 100755
--- a/t/t3007-ls-files-recurse-submodules.sh
+++ b/t/t3007-ls-files-recurse-submodules.sh
@@ -299,6 +299,39 @@ test_expect_success '--recurse-submodules does not support --error-unmatch' '
 	test_i18ngrep "does not support --error-unmatch" actual
 '
 
+test_expect_success '--recurse-submodules parses submodule repo config' '
+	test_config -C submodule index.sparse "invalid non-boolean value" &&
+	test_must_fail git ls-files --recurse-submodules 2>err &&
+	grep "bad boolean config value" err
+'
+
+test_expect_success '--recurse-submodules parses submodule worktree config' '
+	test_config -C submodule extensions.worktreeConfig true &&
+	test_config -C submodule --worktree index.sparse "invalid non-boolean value" &&
+
+	test_must_fail git ls-files --recurse-submodules 2>err &&
+	grep "bad boolean config value" err
+'
+
+test_expect_success '--recurse-submodules submodules ignore super project worktreeConfig extension' '
+	# Enable worktree config in both super project & submodule, set an
+	# invalid config in the submodule worktree config
+	test_config extensions.worktreeConfig true &&
+	test_config -C submodule extensions.worktreeConfig true &&
+	test_config -C submodule --worktree index.sparse "invalid non-boolean value" &&
+
+	# Now, disable the worktree config in the submodule. Note that we need
+	# to manually re-enable extensions.worktreeConfig when the test is
+	# finished, otherwise the test_unconfig of index.sparse will not work.
+	test_unconfig -C submodule extensions.worktreeConfig &&
+	test_when_finished "git -C submodule config extensions.worktreeConfig true" &&
+
+	# With extensions.worktreeConfig disabled in the submodule, the invalid
+	# worktree config is not picked up.
+	git ls-files --recurse-submodules 2>err &&
+	! grep "bad boolean config value" err
+'
+
 test_incompatible_with_recurse_submodules () {
 	test_expect_success "--recurse-submodules and $1 are incompatible" "
 		test_must_fail git ls-files --recurse-submodules $1 2>actual &&
diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
index 6e19ebc922..b3864e22e9 100644
--- a/t/test-lib-functions.sh
+++ b/t/test-lib-functions.sh
@@ -542,8 +542,17 @@ test_config () {
 		config_dir=$1
 		shift
 	fi
-	test_when_finished "test_unconfig ${config_dir:+-C '$config_dir'} '$1'" &&
-	git ${config_dir:+-C "$config_dir"} config "$@"
+
+	# If --worktree is provided, use it to configure/unconfigure
+	is_worktree=
+	if test "$1" = --worktree
+	then
+		is_worktree=1
+		shift
+	fi
+
+	test_when_finished "test_unconfig ${config_dir:+-C '$config_dir'} ${is_worktree:+--worktree} '$1'" &&
+	git ${config_dir:+-C "$config_dir"} config ${is_worktree:+--worktree} "$@"
 }
 
 test_config_global () {
diff --git a/worktree.c b/worktree.c
index b5ee71c5eb..c448fecd4b 100644
--- a/worktree.c
+++ b/worktree.c
@@ -806,7 +806,7 @@ int init_worktree_config(struct repository *r)
 	 * If the extension is already enabled, then we can skip the
 	 * upgrade process.
 	 */
-	if (repository_format_worktree_config)
+	if (r->repository_format_worktree_config)
 		return 0;
 	if ((res = git_config_set_gently("extensions.worktreeConfig", "true")))
 		return error(_("failed to set extensions.worktreeConfig setting"));
@@ -846,7 +846,7 @@ int init_worktree_config(struct repository *r)
 	 * Ensure that we use worktree config for the remaining lifetime
 	 * of the current process.
 	 */
-	repository_format_worktree_config = 1;
+	r->repository_format_worktree_config = 1;
 
 cleanup:
 	git_configset_clear(&cs);