$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-json.git /var/lib/mock/f41-build-847367-163983/root/chroot_tmpdir/scmroot/gap-pkg-json
Cloning into '/var/lib/mock/f41-build-847367-163983/root/chroot_tmpdir/scmroot/gap-pkg-json'...
$ git fetch origin 414841af5eb1015ed66a12142a99a534bc406a54:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-json
 * [new ref]         414841af5eb1015ed66a12142a99a534bc406a54 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 414841a Version 2.2.2