$ git clone -n https://src.fedoraproject.org/rpms/ghc-unix-compat.git /var/lib/mock/f45-build-10894-425/root/chroot_tmpdir/scmroot/ghc-unix-compat
Cloning into '/var/lib/mock/f45-build-10894-425/root/chroot_tmpdir/scmroot/ghc-unix-compat'...
$ git fetch origin b918b889b753093f3a60a6332e616ef25aaf1a28:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-unix-compat
 * [new ref]         b918b889b753093f3a60a6332e616ef25aaf1a28 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b918b88 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild