Read configuration also from $HOME/.gitconfig

This patch is based on Pasky's, with three notable differences:

- I did not yet update the documentation
- I named it .gitconfig, not .gitrc
- git-repo-config does not barf when a unique key is overridden locally

The last means that if you have something like

	[alias]
		l = log --stat -M

in ~/.gitconfig, and

	[alias]
		l = log --stat -M next..

in $GIT_DIR/config, then

	git-repo-config alias.l

returns only one value, namely the value from $GIT_DIR/config.

If you set the environment variable GIT_CONFIG, $HOME/.gitconfig is not
read, and neither $GIT_DIR/config, but $GIT_CONFIG instead.

If you set GIT_CONFIG_LOCAL instead, it is interpreted instead of
$GIT_DIR/config, but $HOME/.gitconfig is still read.

Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 25 insertions, 9 deletions

diff --git a/config.c b/config.c
index 37862d429..d064f429c 100644
--- a/config.c
+++ b/config.c
@@ -317,17 +317,33 @@ int git_config_from_file(config_fn_t fn, const char *filename)
 
 int git_config(config_fn_t fn)
 {
-	const char *filename = git_path("config");
-	/* Forward-compatibility cue: $GIT_CONFIG makes git read _only_
-	 * the given config file, $GIT_CONFIG_LOCAL will make it process
-	 * it in addition to the global config file, the same way it would
-	 * the per-repository config file otherwise. */
-	if (getenv("GIT_CONFIG")) {
-		filename = getenv("GIT_CONFIG");
-	} else if (getenv("GIT_CONFIG_LOCAL")) {
+	int ret = 0;
+	char *repo_config = NULL;
+	const char *home = NULL, *filename;
+
+	/* $GIT_CONFIG makes git read _only_ the given config file,
+	 * $GIT_CONFIG_LOCAL will make it process it in addition to the
+	 * global config file, the same way it would the per-repository
+	 * config file otherwise. */
+	filename = getenv("GIT_CONFIG");
+	if (!filename) {
+		home = getenv("HOME");
 		filename = getenv("GIT_CONFIG_LOCAL");
+		if (!filename)
+			filename = repo_config = strdup(git_path("config"));
 	}
-	return git_config_from_file(fn, filename);
+
+	if (home) {
+		char *user_config = strdup(mkpath("%s/.gitconfig", home));
+		if (access(user_config, R_OK) > 0)
+			ret = git_config_from_file(fn, user_config);
+		free(user_config);
+	}
+
+	ret += git_config_from_file(fn, filename);
+	if (repo_config)
+		free(repo_config);
+	return ret;
 }
 
 /*