[PATCH v2 2/3] for-each-ref: report broken references correctly
- From
Michael Haggerty <mhagger@alum.mit.edu>
- Date
- Jun 2, 2015, 15:57 UTC
- Message-ID
- <1433260647-18181-3-git-send-email-mhagger@alum.mit.edu>
- In-Reply-To
- <1433260647-18181-1-git-send-email-mhagger@alum.mit.edu>
If there is a loose reference file with invalid contents, "git for-each-ref" incorrectly reports the problem as being a missing object with name NULL_SHA1:
$ echo '12345678' >.git/refs/heads/nonsense
$ git for-each-ref
fatal: missing object 0000000000000000000000000000000000000000 for refs/heads/nonsenseWith an explicit "--format" string, it can even report that the reference validly points at NULL_SHA1:
$ git for-each-ref --format='%(objectname) %(refname)'
0000000000000000000000000000000000000000 refs/heads/nonsense
$ echo $?
0This has been broken since
b7dd2d2 for-each-ref: Do not lookup objects when they will not be used (2009-05-27)
, which changed for-each-ref from using for_each_ref() to using git_for_each_rawref() in order to avoid looking up the referred-to objects unnecessarily. (When "git for-each-ref" is given a "--format" string that doesn't include information about the pointed-to object, it does not look up the object at all, which makes it considerably faster. Iterating with DO_FOR_EACH_INCLUDE_BROKEN is essential to this optimization because otherwise for_each_ref() would itself need to check whether the object exists as part of its brokenness test.)
But for_each_rawref() includes broken references in the iteration, and "git for-each-ref" doesn't itself reject references with REF_ISBROKEN. The result is that broken references are processed *as if* they had the value NULL_SHA1, which is the value stored in entries for broken references.
Change "git for-each-ref" to emit warnings for references that are REF_ISBROKEN but to otherwise skip them.
Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> --- builtin/for-each-ref.c | 5 +++++ t/t6301-for-each-ref-errors.sh | 2 +- 2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/builtin/for-each-ref.c b/builtin/for-each-ref.c index 83f9cf9..13d2172 100644 --- a/builtin/for-each-ref.c +++ b/builtin/for-each-ref.c @@ -851,6 +851,11 @@ static int grab_single_ref(const char *refname, const unsigned char *sha1, int f return 0; } + if (flag & REF_ISBROKEN) { + warning("ignoring broken ref %s", refname); + return 0; + } + if (*cb->grab_pattern) { const char **pattern; int namelen = strlen(refname); diff --git a/t/t6301-for-each-ref-errors.sh b/t/t6301-for-each-ref-errors.sh index cf25244..72d2397 100755 --- a/t/t6301-for-each-ref-errors.sh +++ b/t/t6301-for-each-ref-errors.sh @@ -14,7 +14,7 @@ test_expect_success setup ' git for-each-ref --format="%(objectname) %(refname)" >brief-list ' -test_expect_failure 'Broken refs are reported correctly' ' +test_expect_success 'Broken refs are reported correctly' ' r=refs/heads/bogus && : >.git/$r && test_when_finished "rm -f .git/$r" &&
-- 2.1.4