$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-utils.git /var/lib/mock/f39-build-1568982-37690/root/chroot_tmpdir/scmroot/gap-pkg-utils
Cloning into '/var/lib/mock/f39-build-1568982-37690/root/chroot_tmpdir/scmroot/gap-pkg-utils'...
$ git fetch origin 58e8bbab81b358b5af7e5cc17249045f75bce005:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-utils
 * [new ref]         58e8bbab81b358b5af7e5cc17249045f75bce005 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 58e8bba Version 0.84