$ git clone -n https://src.fedoraproject.org/rpms/ghc-wai-extra.git /var/lib/mock/f39-build-2012218-45774/root/chroot_tmpdir/scmroot/ghc-wai-extra
Cloning into '/var/lib/mock/f39-build-2012218-45774/root/chroot_tmpdir/scmroot/ghc-wai-extra'...
$ git fetch origin bde5703b82ea991ae3549df158a672850eb0bd13:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-wai-extra
 * [new ref]         bde5703b82ea991ae3549df158a672850eb0bd13 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bde5703 bump release