$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-cryst.git /var/lib/mock/f38-build-side-42-init-devel-650237-26477/root/chroot_tmpdir/scmroot/gap-pkg-cryst
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-650237-26477/root/chroot_tmpdir/scmroot/gap-pkg-cryst'...
$ git fetch origin e1f2ada2ab6a6ef1020627a819b6bc59b75be15e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-cryst
 * [new ref]         e1f2ada2ab6a6ef1020627a819b6bc59b75be15e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e1f2ada Version 4.1.26