$ git clone -n https://src.fedoraproject.org/rpms/libchewing.git /var/lib/mock/f41-build-side-1-3057289-38399/root/chroot_tmpdir/scmroot/libchewing
Cloning into '/var/lib/mock/f41-build-side-1-3057289-38399/root/chroot_tmpdir/scmroot/libchewing'...
$ git fetch origin 34516e35de211159ab73423703c41c9f0037f0d1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libchewing
 * [new ref]         34516e35de211159ab73423703c41c9f0037f0d1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 34516e3 Update to 0.9.1