Re: [GSoC][PATCH v14 09/11] builtin/fsck: add `git-refs verify` child process

Hmph, I am fine with the approach to take it slower.

BUT.

Here is what the diffstat for the whole thing in the updated round
v15 looked like.  Do most of these changes outside refs/ still
needed if we do not give any way to even optionally enable it via
"fsck" for those who feel adventurous?  Should we still be touching
fsck.[ch] and other fsck related infrastructure in the series?

From my current standing, regardless of whether we run the "git refs
verify" subprocess inside "git-fsck(1)", we must change the fsck
infrastructure illustrated by the following:

From the development of this series, we can know the main problem is
that fsck error message is highly coupled with the object checks. Even
if we don't perform "git refs verify" in "git-fsck(1)", we still need to
follow the fsck msg framework when executing "git refs verify". We
cannot avoid this.

The content we change for "fsck.[ch]" is mainly the fsck msg part. We do
not change anything about the objects.

I agree with you that it would be strange if we do not expose any
interfaces for user who are adventurous. Actually we may simply add an
option "--refs-experimental" or simply "--refs" to allow the users check
ref consistency by using "git-fsck(1)".

I guess the concern that Patrick cares about is that we ONLY make refs
optional here, but do not provide options for other checks. It will be
strange from this perspective.

 Documentation/fsck-msgids.txt |   6 ++
 Documentation/git-refs.txt    |  13 +++++
 builtin/fsck.c                |  17 +++---
 builtin/mktag.c               |   3 +-
 builtin/refs.c                |  34 +++++++++++
 fsck.c                        | 127 +++++++++++++++++++++++++++++++++---------
 fsck.h                        |  76 +++++++++++++++++++------
 object-file.c                 |   9 ++-
 refs.c                        |   5 ++
 refs.h                        |   8 +++
 refs/debug.c                  |  11 ++++
 refs/files-backend.c          | 116 +++++++++++++++++++++++++++++++++++++-
 refs/packed-backend.c         |   8 +++
 refs/refs-internal.h          |   6 ++
 refs/reftable-backend.c       |   8 +++
 t/t0602-reffiles-fsck.sh      |  92 ++++++++++++++++++++++++++++++
 16 files changed, 480 insertions(+), 59 deletions(-)