$ git clone -n https://src.fedoraproject.org/rpms/ghc-generic-lens-core.git /var/lib/mock/f45-build-10301-415/root/chroot_tmpdir/scmroot/ghc-generic-lens-core
Cloning into '/var/lib/mock/f45-build-10301-415/root/chroot_tmpdir/scmroot/ghc-generic-lens-core'...
$ git fetch origin d4b11f13acfff1d7b689d3303422e78af58061ba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-generic-lens-core
 * [new ref]         d4b11f13acfff1d7b689d3303422e78af58061ba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d4b11f1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild