$ git clone -n https://src.fedoraproject.org/forks/hypersa/rpms/ghc-optional-args.git /var/lib/mock/f39-build-2225944-52889/root/chroot_tmpdir/scmroot/ghc-optional-args
Cloning into '/var/lib/mock/f39-build-2225944-52889/root/chroot_tmpdir/scmroot/ghc-optional-args'...
$ git fetch origin de44c7fb68c2c584b16a529aad93a9672d739698:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/forks/hypersa/rpms/ghc-optional-args
 * [new ref]         de44c7fb68c2c584b16a529aad93a9672d739698 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at de44c7f rv64 rebuild