$ git clone -n https://src.fedoraproject.org/rpms/ghc-mime-types.git /var/lib/mock/f38-build-side-42-init-devel-657006-26596/root/chroot_tmpdir/scmroot/ghc-mime-types
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-657006-26596/root/chroot_tmpdir/scmroot/ghc-mime-types'...
$ git fetch origin a8fb79c22a08909e5a101504d2f34fe405a47004:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-mime-types
 * [new ref]         a8fb79c22a08909e5a101504d2f34fe405a47004 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a8fb79c Convert to %autorelease and %autochangelog