$ git clone -n https://src.fedoraproject.org/rpms/ghc-unbounded-delays.git /var/lib/mock/f45-build-10899-425/root/chroot_tmpdir/scmroot/ghc-unbounded-delays
Cloning into '/var/lib/mock/f45-build-10899-425/root/chroot_tmpdir/scmroot/ghc-unbounded-delays'...
$ git fetch origin 566eac537de0fa534ea2f886169ddc1692a04120:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-unbounded-delays
 * [new ref]         566eac537de0fa534ea2f886169ddc1692a04120 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 566eac5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild