Merge branch 'ps/ref-consistency-checks'

Update code paths that check data integrity around refs subsystem.
cf. <CAOLa=ZShPP3BPXa=YnC-vuX4zF=pUTFdUidZwOdna8bfVTNM9w@mail.gmail.com>

* ps/ref-consistency-checks:
  builtin/fsck: drop `fsck_head_link()`
  builtin/fsck: move generic HEAD check into `refs_fsck()`
  builtin/fsck: move generic object ID checks into `refs_fsck()`
  refs/reftable: introduce generic checks for refs
  refs/reftable: fix consistency checks with worktrees
  refs/reftable: extract function to retrieve backend for worktree
  refs/reftable: adapt includes to become consistent
  refs/files: introduce function to perform normal ref checks
  refs/files: extract generic symref target checks
  fsck: drop unused fields from `struct fsck_ref_report`
  refs/files: perform consistency checks for root refs
  refs/files: improve error handling when verifying symrefs
  refs/files: extract function to check single ref
  refs/files: remove useless indirection
  refs/files: remove `refs_check_dir` parameter
  refs/files: move fsck functions into global scope
  refs/files: simplify iterating through root refs

1 files changed, 18 insertions, 0 deletions

diff --git a/refs.h b/refs.h
index d9051bbb04..f0abfa1d93 100644
--- a/refs.h
+++ b/refs.h
@@ -653,6 +653,24 @@ int refs_for_each_reflog(struct ref_store *refs, each_reflog_fn fn, void *cb_dat
  */
 int check_refname_format(const char *refname, int flags);
 
+struct fsck_ref_report;
+
+/*
+ * Perform generic checks for a specific direct ref. This function is
+ * expected to be called by the ref backends for every symbolic ref.
+ */
+int refs_fsck_ref(struct ref_store *refs, struct fsck_options *o,
+		  struct fsck_ref_report *report,
+		  const char *refname, const struct object_id *oid);
+
+/*
+ * Perform generic checks for a specific symref target. This function is
+ * expected to be called by the ref backends for every symbolic ref.
+ */
+int refs_fsck_symref(struct ref_store *refs, struct fsck_options *o,
+		     struct fsck_ref_report *report,
+		     const char *refname, const char *target);
+
 /*
  * Check the reference database for consistency. Return 0 if refs and
  * reflogs are consistent, and non-zero otherwise. The errors will be