[PATCH v3 05/10] config: add read_very_early_config()

["Jeff Hostetler via GitGitGadget" <gitgitgadget@gmail.com>]

From: Jeff Hostetler <jeffhost@microsoft.com>

Created an even lighter version of read_early_config() that
only looks at system and global config settings.  It omits
repo-local, worktree-local, and command-line settings.

Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
---
 config.c | 25 ++++++++++++++++++++++---
 config.h |  4 ++++
 2 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/config.c b/config.c
index 8e5f45fa20..5b10f18088 100644
--- a/config.c
+++ b/config.c
@@ -1688,14 +1688,16 @@ static int do_git_config_sequence(const struct config_options *opts,
 		ret += git_config_from_file(fn, user_config, data);
 
 	current_parsing_scope = CONFIG_SCOPE_REPO;
-	if (repo_config && !access_or_die(repo_config, R_OK, 0))
+	if (!opts->ignore_repo &&
+	    repo_config && !access_or_die(repo_config, R_OK, 0))
 		ret += git_config_from_file(fn, repo_config, data);
 
 	/*
 	 * Note: this should have a new scope, CONFIG_SCOPE_WORKTREE.
 	 * But let's not complicate things before it's actually needed.
 	 */
-	if (repository_format_worktree_config) {
+	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);
@@ -1703,7 +1705,8 @@ static int do_git_config_sequence(const struct config_options *opts,
 	}
 
 	current_parsing_scope = CONFIG_SCOPE_CMDLINE;
-	if (git_config_from_parameters(fn, data) < 0)
+	if (!opts->ignore_cmdline &&
+	    git_config_from_parameters(fn, data) < 0)
 		die(_("unable to parse command-line config"));
 
 	current_parsing_scope = CONFIG_SCOPE_UNKNOWN;
@@ -1794,6 +1797,22 @@ void read_early_config(config_fn_t cb, void *data)
 	strbuf_release(&gitdir);
 }
 
+/*
+ * Read config but only enumerate system and global settings.
+ * Omit any repo-local, worktree-local, or command-line settings.
+ */
+void read_very_early_config(config_fn_t cb, void *data)
+{
+	struct config_options opts = {0};
+
+	opts.respect_includes = 1;
+	opts.ignore_repo = 1;
+	opts.ignore_worktree = 1;
+	opts.ignore_cmdline = 1;
+
+	config_with_options(cb, data, NULL, &opts);
+}
+
 static struct config_set_element *configset_find_element(struct config_set *cs, const char *key)
 {
 	struct config_set_element k;
diff --git a/config.h b/config.h
index ee5d3fa7b4..6a58d61d22 100644
--- a/config.h
+++ b/config.h
@@ -55,6 +55,9 @@ typedef int (*config_parser_event_fn_t)(enum config_event_t type,
 
 struct config_options {
 	unsigned int respect_includes : 1;
+	unsigned int ignore_repo : 1;
+	unsigned int ignore_worktree : 1;
+	unsigned int ignore_cmdline : 1;
 	const char *commondir;
 	const char *git_dir;
 	config_parser_event_fn_t event_fn;
@@ -83,6 +86,7 @@ extern int git_config_from_blob_oid(config_fn_t fn, const char *name,
 extern void git_config_push_parameter(const char *text);
 extern int git_config_from_parameters(config_fn_t fn, void *data);
 extern void read_early_config(config_fn_t cb, void *data);
+extern void read_very_early_config(config_fn_t cb, void *data);
 extern void git_config(config_fn_t fn, void *);
 extern int config_with_options(config_fn_t fn, void *,
 			       struct git_config_source *config_source,
-- 
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