$ git clone -n https://src.fedoraproject.org/rpms/libchewing.git /var/lib/mock/f41-build-848525-164453/root/chroot_tmpdir/scmroot/libchewing
Cloning into '/var/lib/mock/f41-build-848525-164453/root/chroot_tmpdir/scmroot/libchewing'...
$ git fetch origin 390f2d1f70cf87fec93c103d1a4b1539458cf6c5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libchewing
 * [new ref]         390f2d1f70cf87fec93c103d1a4b1539458cf6c5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 390f2d1 Update to 0.9.0