add ref content check for files backend

Hi All:

This version fixes two problems:

1. Remove unnecessary space.
2. Drop extra "strerror(errno)".

Thanks,
Jialuo

shejialuo (9):
ref: initialize "fsck_ref_report" with zero
ref: check the full refname instead of basename
ref: initialize ref name outside of check functions
ref: support multiple worktrees check for refs
ref: port git-fsck(1) regular refs check for files backend
ref: add more strict checks for regular refs
ref: add basic symref content check for files backend
ref: check whether the target of the symref is a ref
ref: add symlink ref content check for files backend

 Documentation/fsck-msgids.txt |  35 +++
 builtin/refs.c                |  10 +-
 fsck.h                        |   6 +
 refs.c                        |   7 +-
 refs.h                        |   3 +-
 refs/debug.c                  |   5 +-
 refs/files-backend.c          | 194 +++++++++++-
 refs/packed-backend.c         |   8 +-
 refs/refs-internal.h          |   5 +-
 refs/reftable-backend.c       |   3 +-
 t/t0602-reffiles-fsck.sh      | 576 ++++++++++++++++++++++++++++++++--
 11 files changed, 790 insertions(+), 62 deletions(-)

Range-diff against v8:

 1:  bfb2a21af4 =  1:  bfb2a21af4 ref: initialize "fsck_ref_report" with zero
 2:  9efc83f7ea =  2:  9efc83f7ea ref: check the full refname instead of basename
 3:  5ea7d18203 =  3:  5ea7d18203 ref: initialize ref name outside of check functions
 4:  cb4669b64d =  4:  cb4669b64d ref: support multiple worktrees check for refs
 5:  c6c128c922 !  5:  d6188063d9 ref: port git-fsck(1) regular refs check for files backend
    @@ refs/files-backend.c: typedef int (*files_fsck_refs_fn)(struct ref_store *ref_st
     +	if (S_ISLNK(iter->st.st_mode))
     +		goto cleanup;
     +
    -+	if (strbuf_read_file(&ref_content, iter->path.buf, 0) < 0 ) {
    ++	if (strbuf_read_file(&ref_content, iter->path.buf, 0) < 0) {
     +		/*
     +		 * Ref file could be removed by another concurrent process. We should
     +		 * ignore this error and continue to the next ref.
    @@ refs/files-backend.c: typedef int (*files_fsck_refs_fn)(struct ref_store *ref_st
     +		if (errno == ENOENT)
     +			goto cleanup;
     +
    -+		ret = error_errno(_("cannot read ref file '%s': %s"),
    -+				  iter->path.buf, strerror(errno));
    ++		ret = error_errno(_("cannot read ref file '%s'"), iter->path.buf);
     +		goto cleanup;
     +	}
     +
 6:  911fa42717 =  6:  e5e97ba3ad ref: add more strict checks for regular refs
 7:  7aa6a99206 =  7:  1dec0a56d2 ref: add basic symref content check for files backend
 8:  dbb0787ad1 =  8:  dcc4a02102 ref: check whether the target of the symref is a ref
 9:  a6d85b4864 !  9:  fc10862f6f ref: add symlink ref content check for files backend

@@ refs/files-backend.c: static int files_fsck_refs_content(struct ref_store *ref_s
goto cleanup;
+ }

- if (strbuf_read_file(&ref_content, iter->path.buf, 0) < 0 ) {
+ if (strbuf_read_file(&ref_content, iter->path.buf, 0) < 0) {
/*
@@ refs/files-backend.c: static int files_fsck_refs_content(struct ref_store *ref_store,
goto cleanup;

2.47.0