$ git clone -n https://src.fedoraproject.org/rpms/gdb-exploitable.git /var/lib/mock/f41-build-1020888-18021/root/chroot_tmpdir/scmroot/gdb-exploitable
Cloning into '/var/lib/mock/f41-build-1020888-18021/root/chroot_tmpdir/scmroot/gdb-exploitable'...
$ git fetch origin 40b93e1bb536774a681b22b5aac73cb4ef1affa9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gdb-exploitable
 * [new ref]         40b93e1bb536774a681b22b5aac73cb4ef1affa9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 40b93e1 Eliminate use of obsolete %patchN syntax (#2283636)