$ git clone -n https://src.fedoraproject.org/rpms/perl-IO-Digest.git /var/lib/mock/f45-build-24165-602/root/chroot_tmpdir/scmroot/perl-IO-Digest
Cloning into '/var/lib/mock/f45-build-24165-602/root/chroot_tmpdir/scmroot/perl-IO-Digest'...
$ git fetch origin c2c3ed6f6c9cc8672d3a1d684ab7158bf05778a6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-IO-Digest
 * [new ref]         c2c3ed6f6c9cc8672d3a1d684ab7158bf05778a6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c2c3ed6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild