$ git clone -n https://src.fedoraproject.org/rpms/ghc-prelude-extras.git /var/lib/mock/f38-build-side-42-init-devel-813918-28316/root/chroot_tmpdir/scmroot/ghc-prelude-extras
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-813918-28316/root/chroot_tmpdir/scmroot/ghc-prelude-extras'...
$ git fetch origin 63eaba8926de86504e60b47bfd1af602eac532f0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-prelude-extras
 * [new ref]         63eaba8926de86504e60b47bfd1af602eac532f0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 63eaba8 Convert to %autorelease and %autochangelog