$ git clone -n https://src.fedoraproject.org/rpms/ghc-base-prelude.git /var/lib/mock/f38-build-side-42-init-devel-912462-28697/root/chroot_tmpdir/scmroot/ghc-base-prelude
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-912462-28697/root/chroot_tmpdir/scmroot/ghc-base-prelude'...
$ git fetch origin d81a5c555bf0c3b8bcd56a92061e6e8841866c75:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-base-prelude
 * [new ref]         d81a5c555bf0c3b8bcd56a92061e6e8841866c75 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d81a5c5 Convert to %autorelease and %autochangelog