$ git clone -n https://src.fedoraproject.org/rpms/ghc-libffi.git /var/lib/mock/f45-build-10462-418/root/chroot_tmpdir/scmroot/ghc-libffi
Cloning into '/var/lib/mock/f45-build-10462-418/root/chroot_tmpdir/scmroot/ghc-libffi'...
$ git fetch origin cfb8fe8388cc59016bc3b138e520c95a8e31435b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-libffi
 * [new ref]         cfb8fe8388cc59016bc3b138e520c95a8e31435b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cfb8fe8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild