$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-xmod.git /var/lib/mock/f45-build-52146-907/root/chroot_tmpdir/scmroot/gap-pkg-xmod
Cloning into '/var/lib/mock/f45-build-52146-907/root/chroot_tmpdir/scmroot/gap-pkg-xmod'...
$ git fetch origin cc5ddd48cb9e1b0dedc0e69864bcd14516c4f5e8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-xmod
 * [new ref]         cc5ddd48cb9e1b0dedc0e69864bcd14516c4f5e8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cc5ddd4 Version 2.99