Merge branch 'ma/lockfile-fixes'

An earlier update made it possible to use an on-stack in-core
lockfile structure (as opposed to having to deliberately leak an
on-heap one).  Many codepaths have been updated to take advantage
of this new facility.

* ma/lockfile-fixes:
  read_cache: roll back lock in `update_index_if_able()`
  read-cache: leave lock in right state in `write_locked_index()`
  read-cache: drop explicit `CLOSE_LOCK`-flag
  cache.h: document `write_locked_index()`
  apply: remove `newfd` from `struct apply_state`
  apply: move lockfile into `apply_state`
  cache-tree: simplify locking logic
  checkout-index: simplify locking logic
  tempfile: fix documentation on `delete_tempfile()`
  lockfile: fix documentation on `close_lock_file_gently()`
  treewide: prefer lockfiles on the stack
  sha1_file: do not leak `lock_file`

1 files changed, 6 insertions, 8 deletions

diff --git a/builtin/checkout.c b/builtin/checkout.c
index fc4f8fd2ea..fcff0de198 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -247,7 +247,7 @@ static int checkout_paths(const struct checkout_opts *opts,
 	struct object_id rev;
 	struct commit *head;
 	int errs = 0;
-	struct lock_file *lock_file;
+	struct lock_file lock_file = LOCK_INIT;
 
 	if (opts->track != BRANCH_TRACK_UNSPECIFIED)
 		die(_("'%s' cannot be used with updating paths"), "--track");
@@ -275,9 +275,7 @@ static int checkout_paths(const struct checkout_opts *opts,
 		return run_add_interactive(revision, "--patch=checkout",
 					   &opts->pathspec);
 
-	lock_file = xcalloc(1, sizeof(struct lock_file));
-
-	hold_locked_index(lock_file, LOCK_DIE_ON_ERROR);
+	hold_locked_index(&lock_file, LOCK_DIE_ON_ERROR);
 	if (read_cache_preload(&opts->pathspec) < 0)
 		return error(_("index file corrupt"));
 
@@ -376,7 +374,7 @@ static int checkout_paths(const struct checkout_opts *opts,
 	}
 	errs |= finish_delayed_checkout(&state);
 
-	if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
+	if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
 		die(_("unable to write new index file"));
 
 	read_ref_full("HEAD", 0, rev.hash, NULL);
@@ -472,9 +470,9 @@ static int merge_working_tree(const struct checkout_opts *opts,
 			      int *writeout_error)
 {
 	int ret;
-	struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
+	struct lock_file lock_file = LOCK_INIT;
 
-	hold_locked_index(lock_file, LOCK_DIE_ON_ERROR);
+	hold_locked_index(&lock_file, LOCK_DIE_ON_ERROR);
 	if (read_cache_preload(NULL) < 0)
 		return error(_("index file corrupt"));
 
@@ -591,7 +589,7 @@ static int merge_working_tree(const struct checkout_opts *opts,
 	if (!cache_tree_fully_valid(active_cache_tree))
 		cache_tree_update(&the_index, WRITE_TREE_SILENT | WRITE_TREE_REPAIR);
 
-	if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
+	if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
 		die(_("unable to write new index file"));
 
 	if (!opts->force && !opts->quiet)