$ git clone -n https://src.fedoraproject.org/rpms/perl-Math-Base85.git /var/lib/mock/f45-build-24666-605/root/chroot_tmpdir/scmroot/perl-Math-Base85
Cloning into '/var/lib/mock/f45-build-24666-605/root/chroot_tmpdir/scmroot/perl-Math-Base85'...
$ git fetch origin 1f6845115c75fe6bbe811c2d672af30001c442b1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Math-Base85
 * [new ref]         1f6845115c75fe6bbe811c2d672af30001c442b1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1f68451 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild