$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-digraphs.git /var/lib/mock/f38-build-711523-93926/root/chroot_tmpdir/scmroot/gap-pkg-digraphs
Cloning into '/var/lib/mock/f38-build-711523-93926/root/chroot_tmpdir/scmroot/gap-pkg-digraphs'...
$ git fetch origin b0999e950a8e4110c306e56b558426069281716f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-digraphs
 * [new ref]         b0999e950a8e4110c306e56b558426069281716f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b0999e9 Version 1.6.2