$ git clone -n https://src.fedoraproject.org/rpms/ghc-constraints.git /var/lib/mock/f45-build-10120-413/root/chroot_tmpdir/scmroot/ghc-constraints
Cloning into '/var/lib/mock/f45-build-10120-413/root/chroot_tmpdir/scmroot/ghc-constraints'...
$ git fetch origin 0a63477b7dea7e88ad467d870900fdfc279ee726:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-constraints
 * [new ref]         0a63477b7dea7e88ad467d870900fdfc279ee726 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0a63477 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild