$ git clone -n https://src.fedoraproject.org/rpms/ghc-cassava.git /var/lib/mock/f40-build-2197663-51683/root/chroot_tmpdir/scmroot/ghc-cassava
Cloning into '/var/lib/mock/f40-build-2197663-51683/root/chroot_tmpdir/scmroot/ghc-cassava'...
$ git fetch origin 264caca1830bf51e921bfdb53d9810d64d3c7ecc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-cassava
 * [new ref]         264caca1830bf51e921bfdb53d9810d64d3c7ecc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 264caca bump release