[PATCH] bisect: don't use invalid oid as rev when starting
- From
Christian Couder <christian.couder@gmail.com>
- Date
- Sep 23, 2020, 17:09 UTC
- Message-ID
- <20200923170915.21748-1-chriscool@tuxfamily.org>
In 06f5608c14 (bisect--helper: `bisect_start` shell function partially in C, 2019-01-02), we changed the following shell code:
- rev=$(git rev-parse -q --verify "$arg^{commit}") || {
- test $has_double_dash -eq 1 &&
- die "$(eval_gettext "'\$arg' does not appear to be a valid revision")"
- break
- }
- revs="$revs $rev"into:
+ char *commit_id = xstrfmt("%s^{commit}", arg);
+ if (get_oid(commit_id, &oid) && has_double_dash)
+ die(_("'%s' does not appear to be a valid "
+ "revision"), arg);
+
+ string_list_append(&revs, oid_to_hex(&oid));
+ free(commit_id);In case of an invalid "arg" when "has_double_dash" is false, the old code would "break" out of the argument loop.
In the new C code though, `oid_to_hex(&oid)` is unconditonally appended to "revs". This is wrong first because "oid" is junk as `get_oid(commit_id, &oid)` failed and second because it doesn't break out of the argument loop.
Not breaking out of the argument loop means that "arg" is then not treated as a path restriction (which is wrong).
Signed-off-by: Christian Couder <chriscool@tuxfamily.org> --- This is a bug fix for the bug Miriam talks about in:
https://lore.kernel.org/git/20200923072740.20772-1-mirucam@gmail.com/
and:
https://lore.kernel.org/git/CAN7CjDDVp_i7dhpbAq5zrGW69nE6+SfivJQ-dembmu+WyqKiQQ@mail.gmail.com/
builtin/bisect--helper.c | 14 +++++++++----- t/t6030-bisect-porcelain.sh | 7 +++++++ 2 files changed, 16 insertions(+), 5 deletions(-)
diff --git a/builtin/bisect--helper.c b/builtin/bisect--helper.c index 7dcc1b5188..538fa6f16b 100644 --- a/builtin/bisect--helper.c +++ b/builtin/bisect--helper.c @@ -486,12 +486,16 @@ static int bisect_start(struct bisect_terms *terms, const char **argv, int argc) return error(_("unrecognized option: '%s'"), arg); } else { char *commit_id = xstrfmt("%s^{commit}", arg); - if (get_oid(commit_id, &oid) && has_double_dash) - die(_("'%s' does not appear to be a valid " - "revision"), arg); - - string_list_append(&revs, oid_to_hex(&oid)); + int res = get_oid(commit_id, &oid); free(commit_id); + if (res) { + if (has_double_dash) + die(_("'%s' does not appear to be a valid " + "revision"), arg); + break; + } else { + string_list_append(&revs, oid_to_hex(&oid)); + } } } pathspec_pos = i; diff --git a/t/t6030-bisect-porcelain.sh b/t/t6030-bisect-porcelain.sh index b886529e59..cb645cf8c8 100755 --- a/t/t6030-bisect-porcelain.sh +++ b/t/t6030-bisect-porcelain.sh @@ -82,6 +82,13 @@ test_expect_success 'bisect fails if given any junk instead of revs' ' git bisect bad $HASH4 ' +test_expect_success 'bisect start without -- uses unknown stuff as path restriction' ' + git bisect reset && + git bisect start foo bar && + grep foo ".git/BISECT_NAMES" && + grep bar ".git/BISECT_NAMES" +' + test_expect_success 'bisect reset: back in the master branch' ' git bisect reset && echo "* master" > branch.expect &&
-- 2.28.0.587.g1c7fdf1d8b