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 <chrisc...@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

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