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refs: add GIT_TRACE_REFS debugging mechanism

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When set in the environment, GIT_TRACE_REFS makes git print operations and
results as they flow through the ref storage backend. This helps debug
discrepancies between different ref backends.

Example:

    $ GIT_TRACE_REFS="1" ./git branch
    15:42:09.769631 refs/debug.c:26         ref_store for .git
    15:42:09.769681 refs/debug.c:249        read_raw_ref: HEAD: 0000000000000000000000000000000000000000 (=> refs/heads/ref-debug) type 1: 0
    15:42:09.769695 refs/debug.c:249        read_raw_ref: refs/heads/ref-debug: 3a238e539b (=> refs/heads/ref-debug) type 0: 0
    15:42:09.770282 refs/debug.c:233        ref_iterator_begin: refs/heads/ (0x1)
    15:42:09.770290 refs/debug.c:189        iterator_advance: refs/heads/b4 (0)
    15:42:09.770295 refs/debug.c:189        iterator_advance: refs/heads/branch3 (0)

Signed-off-by: Han-Wen Nienhuys <hanwen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Han-Wen Nienhuys
2020-09-09 10:15:08 +00:00
committed by Junio C Hamano
parent 3a238e539b
commit 4441f42707
5 changed files with 409 additions and 0 deletions
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5
refs/refs-internal.h
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@ -690,4 +690,9 @@ int parse_loose_ref_contents(const char *buf, struct object_id *oid,
void base_ref_store_init(struct ref_store *refs,
const struct ref_storage_be *be);
/*
* Support GIT_TRACE_REFS by optionally wrapping the given ref_store instance.
*/
struct ref_store *maybe_debug_wrap_ref_store(const char *gitdir, struct ref_store *store);
#endif /* REFS_REFS_INTERNAL_H */