$ git clone -n https://src.fedoraproject.org/rpms/perl-boolean.git /var/lib/mock/f45-build-27638-625/root/chroot_tmpdir/scmroot/perl-boolean
Cloning into '/var/lib/mock/f45-build-27638-625/root/chroot_tmpdir/scmroot/perl-boolean'...
$ git fetch origin 93335a3398403bf18ff987ed4b816e722912a70e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-boolean
 * [new ref]         93335a3398403bf18ff987ed4b816e722912a70e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 93335a3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild