$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-hapcryst.git /var/lib/mock/f41-build-1102521-20044/root/chroot_tmpdir/scmroot/gap-pkg-hapcryst
Cloning into '/var/lib/mock/f41-build-1102521-20044/root/chroot_tmpdir/scmroot/gap-pkg-hapcryst'...
$ git fetch origin ccd39cc65607e1119dc9e9c8b013c24e6f00f435:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-hapcryst
 * [new ref]         ccd39cc65607e1119dc9e9c8b013c24e6f00f435 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ccd39cc Rebuild for gap 4.13.0