$ git clone -n https://src.fedoraproject.org/rpms/jansi-native.git /var/lib/mock/f40-build-2125550-50779/root/chroot_tmpdir/scmroot/jansi-native
Cloning into '/var/lib/mock/f40-build-2125550-50779/root/chroot_tmpdir/scmroot/jansi-native'...
$ git fetch origin a443a56bf4111ab887a23ea812ab0b20d2281be0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jansi-native
 * [new ref]         a443a56bf4111ab887a23ea812ab0b20d2281be0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a443a56 rebuilt w/ no changes