$ git clone -n https://src.fedoraproject.org/rpms/ghc-feed.git /var/lib/mock/f38-build-side-42-init-devel-1066832-29778/root/chroot_tmpdir/scmroot/ghc-feed
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1066832-29778/root/chroot_tmpdir/scmroot/ghc-feed'...
$ git fetch origin aad5c2c981099cc5869291c31ca61fe413c549ae:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-feed
 * [new ref]         aad5c2c981099cc5869291c31ca61fe413c549ae -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aad5c2c Convert to %autorelease and %autochangelog