$ git clone -n https://src.fedoraproject.org/rpms/perl-RPM-Specfile.git /var/lib/mock/f45-build-26034-614/root/chroot_tmpdir/scmroot/perl-RPM-Specfile
Cloning into '/var/lib/mock/f45-build-26034-614/root/chroot_tmpdir/scmroot/perl-RPM-Specfile'...
$ git fetch origin bfb7677bfe40115d583b7c90d380700f4c616797:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-RPM-Specfile
 * [new ref]         bfb7677bfe40115d583b7c90d380700f4c616797 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bfb7677 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild