$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-standardff.git /var/lib/mock/f40-build-805162-144709/root/chroot_tmpdir/scmroot/gap-pkg-standardff
Cloning into '/var/lib/mock/f40-build-805162-144709/root/chroot_tmpdir/scmroot/gap-pkg-standardff'...
$ git fetch origin 63d70523f4acf9749173c3257b292007a615c496:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-standardff
 * [new ref]         63d70523f4acf9749173c3257b292007a615c496 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 63d7052 Version 1.0