Thanks Martin for the review of the last round!

Changes compared to the previous round:
- always pass COMMIT_LOCK to write_locked_index
- don't write the error message in repo_refresh_and_write_index, but
  let the caller handle that.  This means that we no longer change any
  error messages.  Potential cleanups in that area can come later.
- Drop the lock variable to the scope it needs.

Range diff below:

1:  7249a3cf4e ! 1:  1f25fe227c factor out refresh_and_write_cache function
    @@ builtin/am.c: static void am_run(struct am_state *state, int resume)
        unlink(am_path(state, "dirtyindex"));
      
     -  refresh_and_write_cache();
    -+  if (refresh_and_write_cache(REFRESH_QUIET, COMMIT_LOCK) < 0)
    -+          die(_("failed to refresh cache"));
    ++  if (refresh_and_write_cache(REFRESH_QUIET, 0) < 0)
    ++          die(_("unable to write index file"));
      
        if (repo_index_has_changes(the_repository, NULL, &sb)) {
                write_state_bool(state, "dirtyindex", 1);
    @@ cache.h: void fill_stat_cache_info(struct index_state *istate, struct 
cache_entr
     +/*
     + * Refresh the index and write it to disk.
     + *
    ++ * 'refresh_flags' is passed directly to 'refresh_index()', while
    ++ * 'COMMIT_LOCK | write_flags' is passed to 'write_locked_index()', so
    ++ * the lockfile is always either committed or rolled back.
    ++ *
     + * Return 1 if refreshing the cache failed, -1 if writing the cache to
     + * disk failed, 0 on success.
     + */
    @@ read-cache.c: static void show_file(const char * fmt, const char * name, 
int in_
     +  repo_hold_locked_index(repo, &lock_file, LOCK_DIE_ON_ERROR);
     +  if (refresh_index(repo->index, refresh_flags, pathspec, seen, 
header_msg))
     +          return 1;
    -+  if (write_locked_index(repo->index, &lock_file, write_flags))
    -+          return error(_("unable to write index file"));
    ++  if (write_locked_index(repo->index, &lock_file, COMMIT_LOCK | 
write_flags))
    ++          return -1;
     +  return 0;
     +}
     +
2:  de5b8c1529 ! 2:  148a65d649 merge: use refresh_and_write_cache
    @@ Commit message
     
      ## builtin/merge.c ##
     @@ builtin/merge.c: static int try_merge_strategy(const char *strategy, 
struct commit_list *common,
    -   struct lock_file lock = LOCK_INIT;
    +                         struct commit_list *remoteheads,
    +                         struct commit *head)
    + {
    +-  struct lock_file lock = LOCK_INIT;
        const char *head_arg = "HEAD";
      
     -  hold_locked_index(&lock, LOCK_DIE_ON_ERROR);
     -  refresh_cache(REFRESH_QUIET);
     -  if (write_locked_index(&the_index, &lock,
     -                         COMMIT_LOCK | SKIP_IF_UNCHANGED))
    --          return error(_("Unable to write index."));
    -+  if (refresh_and_write_cache(REFRESH_QUIET, COMMIT_LOCK | 
SKIP_IF_UNCHANGED) < 0)
    -+          return -1;
    ++  if (refresh_and_write_cache(REFRESH_QUIET, SKIP_IF_UNCHANGED) < 0)
    +           return error(_("Unable to write index."));
      
        if (!strcmp(strategy, "recursive") || !strcmp(strategy, "subtree")) {
    ++          struct lock_file lock = LOCK_INIT;
                int clean, x;
    +           struct commit *result;
    +           struct commit_list *reversed = NULL;
     @@ builtin/merge.c: static int merge_trivial(struct commit *head, struct 
commit_list *remoteheads)
      {
        struct object_id result_tree, result_commit;
    @@ builtin/merge.c: static int merge_trivial(struct commit *head, struct 
commit_lis
     -  refresh_cache(REFRESH_QUIET);
     -  if (write_locked_index(&the_index, &lock,
     -                         COMMIT_LOCK | SKIP_IF_UNCHANGED))
    --          return error(_("Unable to write index."));
    -+  if (refresh_and_write_cache(REFRESH_QUIET, COMMIT_LOCK | 
SKIP_IF_UNCHANGED) < 0)
    -+          return -1;
    ++  if (refresh_and_write_cache(REFRESH_QUIET, SKIP_IF_UNCHANGED) < 0)
    +           return error(_("Unable to write index."));
      
        write_tree_trivial(&result_tree);
    -   printf(_("Wonderful.\n"));
3:  d9efda0f2a ! 3:  e0f6815192 stash: make sure to write refreshed cache
    @@ builtin/stash.c: static int do_apply_stash(const char *prefix, struct 
stash_info
      
        read_cache_preload(NULL);
     -  if (refresh_cache(REFRESH_QUIET))
    -+  if (refresh_and_write_cache(REFRESH_QUIET, COMMIT_LOCK))
    ++  if (refresh_and_write_cache(REFRESH_QUIET, 0))
                return -1;
      
        if (write_cache_as_tree(&c_tree, 0, NULL))
    @@ builtin/stash.c: static int do_apply_stash(const char *prefix, struct 
stash_info
      
        if (quiet) {
     -          if (refresh_cache(REFRESH_QUIET))
    -+          if (refresh_and_write_cache(REFRESH_QUIET, COMMIT_LOCK))
    ++          if (refresh_and_write_cache(REFRESH_QUIET, 0))
                        warning("could not refresh index");
        } else {
                struct child_process cp = CHILD_PROCESS_INIT;
    @@ builtin/stash.c: static int do_create_stash(const struct pathspec *ps, 
struct st
      
        read_cache_preload(NULL);
     -  refresh_cache(REFRESH_QUIET);
    -+  if (refresh_and_write_cache(REFRESH_QUIET, COMMIT_LOCK) < 0) {
    ++  if (refresh_and_write_cache(REFRESH_QUIET, 0) < 0) {
     +          ret = -1;
     +          goto done;
     +  }
    @@ builtin/stash.c: static int do_push_stash(const struct pathspec *ps, 
const char
        }
      
     -  if (refresh_cache(REFRESH_QUIET)) {
    -+  if (refresh_and_write_cache(REFRESH_QUIET, COMMIT_LOCK)) {
    ++  if (refresh_and_write_cache(REFRESH_QUIET, 0)) {
                ret = -1;
                goto done;
        }

Thomas Gummerer (3):
  factor out refresh_and_write_cache function
  merge: use refresh_and_write_cache
  stash: make sure to write refreshed cache

 builtin/am.c     | 16 ++--------------
 builtin/merge.c  | 17 +++++------------
 builtin/stash.c  | 11 +++++++----
 cache.h          | 13 +++++++++++++
 read-cache.c     | 17 +++++++++++++++++
 t/t3903-stash.sh | 16 ++++++++++++++++
 6 files changed, 60 insertions(+), 30 deletions(-)

-- 
2.23.0.rc2.194.ge5444969c9

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