$ git clone -n https://src.fedoraproject.org/rpms/perl-Alien-ROOT.git /var/lib/mock/f45-build-21630-587/root/chroot_tmpdir/scmroot/perl-Alien-ROOT
Cloning into '/var/lib/mock/f45-build-21630-587/root/chroot_tmpdir/scmroot/perl-Alien-ROOT'...
$ git fetch origin e2e40b62fda22448861e2ae42e2228ff4462562d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Alien-ROOT
 * [new ref]         e2e40b62fda22448861e2ae42e2228ff4462562d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e2e40b6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild