$ git clone -n https://src.fedoraproject.org/rpms/perl-Archive-RPM.git /var/lib/mock/f45-build-21798-588/root/chroot_tmpdir/scmroot/perl-Archive-RPM
Cloning into '/var/lib/mock/f45-build-21798-588/root/chroot_tmpdir/scmroot/perl-Archive-RPM'...
$ git fetch origin f5a2aa568b54b6cb83cffa6a48eea5ea8785099c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Archive-RPM
 * [new ref]         f5a2aa568b54b6cb83cffa6a48eea5ea8785099c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f5a2aa5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild