$ git clone -n https://src.fedoraproject.org/rpms/ghc-cprng-aes.git /var/lib/mock/f38-build-side-42-init-devel-846835-28422/root/chroot_tmpdir/scmroot/ghc-cprng-aes
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-846835-28422/root/chroot_tmpdir/scmroot/ghc-cprng-aes'...
$ git fetch origin cb8195c01d2349476b0d5282126712116dd215b2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-cprng-aes
 * [new ref]         cb8195c01d2349476b0d5282126712116dd215b2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cb8195c Convert to %autorelease and %autochangelog