$ git clone -n https://src.fedoraproject.org/rpms/fcitx5-chewing.git /var/lib/mock/f39-build-1539267-36419/root/chroot_tmpdir/scmroot/fcitx5-chewing
Cloning into '/var/lib/mock/f39-build-1539267-36419/root/chroot_tmpdir/scmroot/fcitx5-chewing'...
$ git fetch origin 7e7a7c27ca63a4423f2e73befb6f464182dec972:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fcitx5-chewing
 * [new ref]         7e7a7c27ca63a4423f2e73befb6f464182dec972 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7e7a7c2 update to upstream release 5.1.1