$ git clone -n https://src.fedoraproject.org/rpms/ghc-lens-aeson.git /var/lib/mock/f38-build-side-42-init-devel-1023099-29660/root/chroot_tmpdir/scmroot/ghc-lens-aeson
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1023099-29660/root/chroot_tmpdir/scmroot/ghc-lens-aeson'...
$ git fetch origin 4f634b76c8954caf402e6626c2a15f107cdf3d73:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-lens-aeson
 * [new ref]         4f634b76c8954caf402e6626c2a15f107cdf3d73 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4f634b7 Convert to %autorelease and %autochangelog