$ git clone -n https://src.fedoraproject.org/rpms/libchewing.git /var/lib/mock/f41-build-826381-154904/root/chroot_tmpdir/scmroot/libchewing
Cloning into '/var/lib/mock/f41-build-826381-154904/root/chroot_tmpdir/scmroot/libchewing'...
$ git fetch origin 19d491c4d4cce08470f8e2095c8fe6a0a9fd8c29:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libchewing
 * [new ref]         19d491c4d4cce08470f8e2095c8fe6a0a9fd8c29 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 19d491c Update to 0.9.0-rc.3