$ git clone -n https://src.fedoraproject.org/rpms/gdbm.git /var/lib/mock/f42-build-3273393-41310/root/chroot_tmpdir/scmroot/gdbm
Cloning into '/var/lib/mock/f42-build-3273393-41310/root/chroot_tmpdir/scmroot/gdbm'...
$ git fetch origin 44ea7380c69b1c139fe385bc1c5940070b36c626:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gdbm
 * [new ref]         44ea7380c69b1c139fe385bc1c5940070b36c626 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 44ea738 Stick with -std=gnu11