git_config_set: reuse empty sections

diff --git a/read-cache.c b/read-cache.c
index 536086e1fe69da7a6522516bb281870ac9261130..198e72b6851a13bd5bf3f8b1dc417a732cd5b147 100644 (file)
--- a/read-cache.c
+++ b/read-cache.c
@@ -1603,7 +1603,7 @@ int hold_locked_index(struct lock_file *lk, int lock_flags)
 
 int read_index(struct index_state *istate)
 {
-       return read_index_from(istate, get_index_file());
+       return read_index_from(istate, get_index_file(), get_git_dir());
 }
 
 static struct cache_entry *cache_entry_from_ondisk(struct ondisk_cache_entry *ondisk,
@@ -1863,20 +1863,19 @@ int do_read_index(struct index_state *istate, const char *path, int must_exist)
  * This way, shared index can be removed if they have not been used
  * for some time.
  */
-static void freshen_shared_index(char *base_sha1_hex, int warn)
+static void freshen_shared_index(const char *shared_index, int warn)
 {
-       char *shared_index = git_pathdup("sharedindex.%s", base_sha1_hex);
        if (!check_and_freshen_file(shared_index, 1) && warn)
                warning("could not freshen shared index '%s'", shared_index);
-       free(shared_index);
 }
 
-int read_index_from(struct index_state *istate, const char *path)
+int read_index_from(struct index_state *istate, const char *path,
+                   const char *gitdir)
 {
        struct split_index *split_index;
        int ret;
        char *base_sha1_hex;
-       const char *base_path;
+       char *base_path;
 
        /* istate->initialized covers both .git/index and .git/sharedindex.xxx */
        if (istate->initialized)
@@ -1896,16 +1895,17 @@ int read_index_from(struct index_state *istate, const char *path)
                split_index->base = xcalloc(1, sizeof(*split_index->base));
 
        base_sha1_hex = sha1_to_hex(split_index->base_sha1);
-       base_path = git_path("sharedindex.%s", base_sha1_hex);
+       base_path = xstrfmt("%s/sharedindex.%s", gitdir, base_sha1_hex);
        ret = do_read_index(split_index->base, base_path, 1);
        if (hashcmp(split_index->base_sha1, split_index->base->sha1))
                die("broken index, expect %s in %s, got %s",
                    base_sha1_hex, base_path,
                    sha1_to_hex(split_index->base->sha1));
 
-       freshen_shared_index(base_sha1_hex, 0);
+       freshen_shared_index(base_path, 0);
        merge_base_index(istate);
        post_read_index_from(istate);
+       free(base_path);
        return ret;
 }
 
@@ -2243,7 +2243,7 @@ static int do_write_index(struct index_state *istate, struct tempfile *tempfile,
        struct stat st;
        struct ondisk_cache_entry_extended ondisk;
        struct strbuf previous_name_buf = STRBUF_INIT, *previous_name;
-       int drop_cache_tree = 0;
+       int drop_cache_tree = istate->drop_cache_tree;
 
        for (i = removed = extended = 0; i < entries; i++) {
                if (cache[i]->ce_flags & CE_REMOVE)
@@ -2472,31 +2472,18 @@ static int clean_shared_index_files(const char *current_hex)
 }
 
 static int write_shared_index(struct index_state *istate,
-                             struct lock_file *lock, unsigned flags)
+                             struct tempfile **temp)
 {
-       struct tempfile *real_temp;
-       struct tempfile **temp = &real_temp;
        struct split_index *si = istate->split_index;
        int ret;
 
-       real_temp = mks_tempfile(git_path("sharedindex_XXXXXX"));
-       if (!real_temp) {
-               hashclr(si->base_sha1);
-               return do_write_locked_index(istate, lock, flags);
-       }
-       temp = &real_temp;
        move_cache_to_base_index(istate);
        ret = do_write_index(si->base, *temp, 1);
-       if (ret) {
-               delete_tempfile(temp);
+       if (ret)
                return ret;
-       }
        ret = adjust_shared_perm(get_tempfile_path(*temp));
        if (ret) {
-               int save_errno = errno;
                error("cannot fix permission bits on %s", get_tempfile_path(*temp));
-               delete_tempfile(temp);
-               errno = save_errno;
                return ret;
        }
        ret = rename_tempfile(temp,
@@ -2567,7 +2554,22 @@ int write_locked_index(struct index_state *istate, struct lock_file *lock,
        new_shared_index = istate->cache_changed & SPLIT_INDEX_ORDERED;
 
        if (new_shared_index) {
-               ret = write_shared_index(istate, lock, flags);
+               struct tempfile *temp;
+               int saved_errno;
+
+               temp = mks_tempfile(git_path("sharedindex_XXXXXX"));
+               if (!temp) {
+                       hashclr(si->base_sha1);
+                       ret = do_write_locked_index(istate, lock, flags);
+                       goto out;
+               }
+               ret = write_shared_index(istate, &temp);
+
+               saved_errno = errno;
+               if (is_tempfile_active(temp))
+                       delete_tempfile(&temp);
+               errno = saved_errno;
+
                if (ret)
                        goto out;
        }
@@ -2575,8 +2577,11 @@ int write_locked_index(struct index_state *istate, struct lock_file *lock,
        ret = write_split_index(istate, lock, flags);
 
        /* Freshen the shared index only if the split-index was written */
-       if (!ret && !new_shared_index)
-               freshen_shared_index(sha1_to_hex(si->base_sha1), 1);
+       if (!ret && !new_shared_index) {
+               const char *shared_index = git_path("sharedindex.%s",
+                                                   sha1_to_hex(si->base_sha1));
+               freshen_shared_index(shared_index, 1);
+       }
 
 out:
        if (flags & COMMIT_LOCK)