[PATCH 03/10] get_sha1: propagate flags to child functions
- From
Jeff King <peff@peff.net>
- Date
- Sep 26, 2016, 11:59 UTC
- Message-ID
- <20160926115940.yyedwgz4duxerm4i@sigill.intra.peff.net>
- In-Reply-To
- <20160926115720.p2yb22lcq37gboon@sigill.intra.peff.net>
The get_sha1() function is actually implementation by many sub-functions, but we do not always pass our flags around to all of those functions. As a result, we may forget that our caller asked us to resolve with GET_SHA1_QUIETLY and output messages. The two triggerable cases are:
1. Resolving treeish:path will resolve the "treeish"
portion using GET_SHA1_TREEISH, dropping all other
flags. 2. The peel_onion() function did not take flags at all
but recurses to get_sha1_1(), which does.The solution for both is to bitwise-OR their new flags with the existing ones (after dropping any mutually exclusive disambiguation flags).
This bug can trigger with "git rev-parse --quiet", which asks for quiet resolution. But it can also happen in a more vanilla code path when we do a follow-up ONLY_TO_DIE invocation of get_sha1(), and that's what the tests check.
Signed-off-by: Jeff King <peff@peff.net> --- sha1_name.c | 18 ++++++++++++------ t/t1512-rev-parse-disambiguation.sh | 14 +++++++++++++- 2 files changed, 25 insertions(+), 7 deletions(-)
diff --git a/sha1_name.c b/sha1_name.c index fe05ba0..38e51d9 100644 --- a/sha1_name.c +++ b/sha1_name.c @@ -686,12 +686,12 @@ struct object *peel_to_type(const char *name, int namelen, } } -static int peel_onion(const char *name, int len, unsigned char *sha1) +static int peel_onion(const char *name, int len, unsigned char *sha1, + unsigned lookup_flags) { unsigned char outer[20]; const char *sp; unsigned int expected_type = 0; - unsigned lookup_flags = 0; struct object *o; /* @@ -731,10 +731,11 @@ static int peel_onion(const char *name, int len, unsigned char *sha1) else return -1; + lookup_flags &= ~GET_SHA1_DISAMBIGUATORS; if (expected_type == OBJ_COMMIT) - lookup_flags = GET_SHA1_COMMITTISH; + lookup_flags |= GET_SHA1_COMMITTISH; else if (expected_type == OBJ_TREE) - lookup_flags = GET_SHA1_TREEISH; + lookup_flags |= GET_SHA1_TREEISH; if (get_sha1_1(name, sp - name - 2, outer, lookup_flags)) return -1; @@ -835,7 +836,7 @@ static int get_sha1_1(const char *name, int len, unsigned char *sha1, unsigned l return get_nth_ancestor(name, len1, sha1, num); } - ret = peel_onion(name, len, sha1); + ret = peel_onion(name, len, sha1, lookup_flags); if (!ret) return 0; @@ -1470,7 +1471,12 @@ static int get_sha1_with_context_1(const char *name, if (*cp == ':') { unsigned char tree_sha1[20]; int len = cp - name; - if (!get_sha1_1(name, len, tree_sha1, GET_SHA1_TREEISH)) { + unsigned sub_flags = flags; + + sub_flags &= ~GET_SHA1_DISAMBIGUATORS; + sub_flags |= GET_SHA1_TREEISH; + + if (!get_sha1_1(name, len, tree_sha1, sub_flags)) { const char *filename = cp+1; char *new_filename = NULL; diff --git a/t/t1512-rev-parse-disambiguation.sh b/t/t1512-rev-parse-disambiguation.sh index 16f9709..30e0b80 100755 --- a/t/t1512-rev-parse-disambiguation.sh +++ b/t/t1512-rev-parse-disambiguation.sh @@ -291,10 +291,22 @@ test_expect_success 'ambiguous short sha1 ref' ' grep "refname.*${REF}.*ambiguous" err ' -test_expect_success C_LOCALE_OUTPUT 'ambiguity errors are not repeated' ' +test_expect_success C_LOCALE_OUTPUT 'ambiguity errors are not repeated (raw)' ' test_must_fail git rev-parse 00000 2>stderr && grep "is ambiguous" stderr >errors && test_line_count = 1 errors ' +test_expect_success C_LOCALE_OUTPUT 'ambiguity errors are not repeated (treeish)' ' + test_must_fail git rev-parse 00000:foo 2>stderr && + grep "is ambiguous" stderr >errors && + test_line_count = 1 errors +' + +test_expect_success C_LOCALE_OUTPUT 'ambiguity errors are not repeated (peel)' ' + test_must_fail git rev-parse 00000^{commit} 2>stderr && + grep "is ambiguous" stderr >errors && + test_line_count = 1 errors +' + test_done
-- 2.10.0.492.g14f803f