$ git clone -n https://src.fedoraproject.org/rpms/ghc-pretty-show.git /var/lib/mock/f38-build-side-42-init-devel-963592-28792/root/chroot_tmpdir/scmroot/ghc-pretty-show
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-963592-28792/root/chroot_tmpdir/scmroot/ghc-pretty-show'...
$ git fetch origin 789d9b928721f74edc06e9b833820537eb28d5fe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-pretty-show
 * [new ref]         789d9b928721f74edc06e9b833820537eb28d5fe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 789d9b9 Convert to %autorelease and %autochangelog