$ git clone -n https://src.fedoraproject.org/rpms/ghc-cborg-json.git /var/lib/mock/f40-build-750591-115129/root/chroot_tmpdir/scmroot/ghc-cborg-json
Cloning into '/var/lib/mock/f40-build-750591-115129/root/chroot_tmpdir/scmroot/ghc-cborg-json'...
$ git fetch origin abcb62a9e9524f5633edc05df71125e7ca3fea59:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-cborg-json
 * [new ref]         abcb62a9e9524f5633edc05df71125e7ca3fea59 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at abcb62a bump release