[PATCH v3 4/6] config: add repo_config_set_worktree_gently()

["Derrick Stolee via GitGitGadget" <gitgitgadget@xxxxxxxxx>]

From: Derrick Stolee <dstolee@xxxxxxxxxxxxx>

Some config settings, such as those for sparse-checkout, are likely
intended to only apply to one worktree at a time. To make this write
easier, add a new config API method, repo_config_set_worktree_gently().

This method will attempt to write to the worktree-specific config, but
will instead write to the common config file if worktree config is not
enabled.  The next change will introduce a consumer of this method.

Signed-off-by: Derrick Stolee <dstolee@xxxxxxxxxxxxx>
---
 config.c | 21 +++++++++++++++++++++
 config.h |  8 ++++++++
 2 files changed, 29 insertions(+)

diff --git a/config.c b/config.c
index 9c9eef16018..f849aef253c 100644
--- a/config.c
+++ b/config.c
@@ -21,6 +21,7 @@
 #include "dir.h"
 #include "color.h"
 #include "refs.h"
+#include "worktree.h"
 
 struct config_source {
 	struct config_source *prev;
@@ -2880,6 +2881,20 @@ int git_config_set_gently(const char *key, const char *value)
 	return git_config_set_multivar_gently(key, value, NULL, 0);
 }
 
+int repo_config_set_worktree_gently(struct repository *r,
+				    const char *key, const char *value)
+{
+	/* Only use worktree-specific config if it is is already enabled. */
+	if (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);
+		free(file);
+		return ret;
+	}
+	return repo_config_set_gently(r, key, value);
+}
+
 void git_config_set(const char *key, const char *value)
 {
 	repo_config_set(the_repository, key, value);
@@ -3195,6 +3210,12 @@ int repo_config_set_multivar_gently(struct repository *r, const char *key,
 						      flags);
 }
 
+int repo_config_set_gently(struct repository *r,
+			   const char *key, const char *value)
+{
+	return repo_config_set_multivar_gently(r, key, value, NULL, 0);
+}
+
 void git_config_set_multivar(const char *key, const char *value,
 			     const char *value_pattern, unsigned flags)
 {
diff --git a/config.h b/config.h
index 5531fc018e3..1386009fac8 100644
--- a/config.h
+++ b/config.h
@@ -253,6 +253,13 @@ void git_config_set_in_file(const char *, const char *, const char *);
 
 int git_config_set_gently(const char *, const char *);
 
+/**
+ * Write a config value that should apply to the current worktree. If
+ * extensions.worktreeConfig is enabled, then the write will happen in the
+ * current worktree's config. Otherwise, write to the common config file.
+ */
+int repo_config_set_worktree_gently(struct repository *, const char *, const char *);
+
 /**
  * write config values to `.git/config`, takes a key/value pair as parameter.
  */
@@ -288,6 +295,7 @@ int git_config_set_multivar_gently(const char *, const char *, const char *, uns
 void git_config_set_multivar(const char *, const char *, const char *, unsigned);
 int repo_config_set_multivar_gently(struct repository *, const char *, const char *, const char *, unsigned);
 void repo_config_set_multivar(struct repository *, const char *, const char *, const char *, unsigned);
+int repo_config_set_gently(struct repository *, const char *, const char *);
 int git_config_set_multivar_in_file_gently(const char *, const char *, const char *, const char *, unsigned);
 
 /**
-- 
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