$ git clone -n https://src.fedoraproject.org/rpms/ghc-erf.git /var/lib/mock/f38-build-side-42-init-devel-819523-28339/root/chroot_tmpdir/scmroot/ghc-erf
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-819523-28339/root/chroot_tmpdir/scmroot/ghc-erf'...
$ git fetch origin dade937d384f8834563b26c5f14a41f22ff240ae:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-erf
 * [new ref]         dade937d384f8834563b26c5f14a41f22ff240ae -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dade937 Convert to %autorelease and %autochangelog