$ git clone -n https://src.fedoraproject.org/rpms/perl-Importer.git /var/lib/mock/f45-build-24320-603/root/chroot_tmpdir/scmroot/perl-Importer
Cloning into '/var/lib/mock/f45-build-24320-603/root/chroot_tmpdir/scmroot/perl-Importer'...
$ git fetch origin b5fb5c96ca099701ad2c1d737b29e49015f3d51a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Importer
 * [new ref]         b5fb5c96ca099701ad2c1d737b29e49015f3d51a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b5fb5c9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild