From 47bd3d0c14f081a3ea32b0720f7d59559802904d Mon Sep 17 00:00:00 2001 From: =?utf8?q?SZEDER=20G=C3=A1bor?= Date: Wed, 14 Nov 2018 13:27:25 +0100 Subject: [PATCH] ref-filter: don't look for objects when outside of a repository MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit The command 'git ls-remote --sort=authordate ' segfaults when run outside of a repository, ever since the introduction of its '--sort' option in 1fb20dfd8e (ls-remote: create '--sort' option, 2018-04-09). While in general the 'git ls-remote' command can be run outside of a repository just fine, its '--sort=' option with certain keys does require access to the referenced objects. This sorting is implemented using the generic ref-filter sorting facility, which already handles missing objects gracefully with the appropriate 'missing object deadbeef for HEAD' message. However, being generic means that it checks replace refs while trying to retrieve an object, and while doing so it accesses the 'git_replace_ref_base' variable, which has not been initialized and is still a NULL pointer when outside of a repository, thus causing the segfault. Make ref-filter more careful upfront while parsing the format string, and make it error out when encountering a format atom requiring object access when we are not in a repository. Also add a test to ensure that 'git ls-remote --sort' fails gracefully when executed outside of a repository. Reported-by: H.Merijn Brand Signed-off-by: SZEDER Gábor Signed-off-by: Junio C Hamano --- ref-filter.c | 4 ++++ t/t5512-ls-remote.sh | 6 ++++++ 2 files changed, 10 insertions(+) diff --git a/ref-filter.c b/ref-filter.c index 0c45ed9d94..a1290659af 100644 --- a/ref-filter.c +++ b/ref-filter.c @@ -534,6 +534,10 @@ static int parse_ref_filter_atom(const struct ref_format *format, if (ARRAY_SIZE(valid_atom) <= i) return strbuf_addf_ret(err, -1, _("unknown field name: %.*s"), (int)(ep-atom), atom); + if (valid_atom[i].source != SOURCE_NONE && !have_git_dir()) + return strbuf_addf_ret(err, -1, + _("not a git repository, but the field '%.*s' requires access to object data"), + (int)(ep-atom), atom); /* Add it in, including the deref prefix */ at = used_atom_cnt; diff --git a/t/t5512-ls-remote.sh b/t/t5512-ls-remote.sh index 91ee6841c1..32e722db2e 100755 --- a/t/t5512-ls-remote.sh +++ b/t/t5512-ls-remote.sh @@ -302,6 +302,12 @@ test_expect_success 'ls-remote works outside repository' ' nongit git ls-remote dst.git ' +test_expect_success 'ls-remote --sort fails gracefully outside repository' ' + # Use a sort key that requires access to the referenced objects. + nongit test_must_fail git ls-remote --sort=authordate "$TRASH_DIRECTORY" 2>err && + test_i18ngrep "^fatal: not a git repository, but the field '\''authordate'\'' requires access to object data" err +' + test_expect_success 'ls-remote patterns work with all protocol versions' ' git for-each-ref --format="%(objectname) %(refname)" \ refs/heads/master refs/remotes/origin/master >expect && -- 2.11.4.GIT