$ git clone -n https://src.fedoraproject.org/rpms/ghc-bower-json.git /var/lib/mock/f39-build-1935382-43119/root/chroot_tmpdir/scmroot/ghc-bower-json
Cloning into '/var/lib/mock/f39-build-1935382-43119/root/chroot_tmpdir/scmroot/ghc-bower-json'...
$ git fetch origin 4485e0ca1ea9f3aee5becd60d01eae5a757cfce3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-bower-json
 * [new ref]         4485e0ca1ea9f3aee5becd60d01eae5a757cfce3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4485e0c bump release