$ git clone -n https://src.fedoraproject.org/rpms/ghc-rpm-nvr.git /var/lib/mock/f39-build-1711633-41228/root/chroot_tmpdir/scmroot/ghc-rpm-nvr
Cloning into '/var/lib/mock/f39-build-1711633-41228/root/chroot_tmpdir/scmroot/ghc-rpm-nvr'...
$ git fetch origin e86c591f1acb92b6dbf6a4cdf665b3577208ff8a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-rpm-nvr
 * [new ref]         e86c591f1acb92b6dbf6a4cdf665b3577208ff8a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e86c591 bump release