$ git clone -n https://src.fedoraproject.org/rpms/ghc-wai-extra.git /var/lib/mock/f45-build-52265-908/root/chroot_tmpdir/scmroot/ghc-wai-extra
Cloning into '/var/lib/mock/f45-build-52265-908/root/chroot_tmpdir/scmroot/ghc-wai-extra'...
$ git fetch origin f87bc789780d8006eefb1e2e81ede212774b371a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-wai-extra
 * [new ref]         f87bc789780d8006eefb1e2e81ede212774b371a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f87bc78 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild