$ git clone -n https://src.fedoraproject.org/rpms/perl-Safe-Isa.git /var/lib/mock/f45-build-26106-614/root/chroot_tmpdir/scmroot/perl-Safe-Isa
Cloning into '/var/lib/mock/f45-build-26106-614/root/chroot_tmpdir/scmroot/perl-Safe-Isa'...
$ git fetch origin d4c51f8504b8ccb5655b501efd53773e6ac5d54c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Safe-Isa
 * [new ref]         d4c51f8504b8ccb5655b501efd53773e6ac5d54c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d4c51f8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild