[RFC/PATCH 8/8] read-cache: unlink old sharedindex files

[Christian Couder <christian.couder@gmail.com>]

Everytime split index is turned on, it creates a "sharedindex.XXXX"
file in the git directory. This makes sure that old sharedindex
files are removed after a new one has been created.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
---
 read-cache.c           | 27 ++++++++++++++++++++++++++-
 t/t1700-split-index.sh |  7 +++++++
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/read-cache.c b/read-cache.c
index ae292d6..13aa058 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -2166,6 +2166,28 @@ static int write_split_index(struct index_state *istate,
 	return ret;
 }
 
+static void clean_shared_index_files(const char *current_hex)
+{
+	struct dirent *de;
+	DIR *dir = opendir(get_git_dir());
+
+	if (!dir) {
+		error_errno("unable to open git dir: %s", get_git_dir());
+		return;
+	}
+
+	while ((de = readdir(dir)) != NULL) {
+		const char *sha1_hex;
+		if (!skip_prefix(de->d_name, "sharedindex.", &sha1_hex))
+			continue;
+		if (!strcmp(sha1_hex, current_hex))
+			continue;
+		if (unlink(git_path("%s", de->d_name)))
+			error_errno("unable to unlink: %s", git_path("%s", de->d_name));
+	}
+	closedir(dir);
+}
+
 static struct tempfile temporary_sharedindex;
 
 static int write_shared_index(struct index_state *istate,
@@ -2187,8 +2209,11 @@ static int write_shared_index(struct index_state *istate,
 	}
 	ret = rename_tempfile(&temporary_sharedindex,
 			      git_path("sharedindex.%s", sha1_to_hex(si->base->sha1)));
-	if (!ret)
+	if (!ret) {
 		hashcpy(si->base_sha1, si->base->sha1);
+		clean_shared_index_files(sha1_to_hex(si->base->sha1));
+	}
+
 	return ret;
 }
 
diff --git a/t/t1700-split-index.sh b/t/t1700-split-index.sh
index f1af0d5..5036efa 100755
--- a/t/t1700-split-index.sh
+++ b/t/t1700-split-index.sh
@@ -237,4 +237,11 @@ EOF
 	test_cmp expect actual
 '
 
+test_expect_success 'only one "sharedindex" files' '
+	git config core.splitIndex true &&
+	: >three &&
+	git update-index --add three &&
+	test $(ls .git/sharedindex.* | wc -l) = 1
+'
+
 test_done
-- 
2.9.0.250.g7087ccc.dirty