$ git clone -n https://gitee.com/opencloudos-stream/pngcheck.git /var/lib/mock/dist-oc9-epol-build-255858-84538/root/chroot_tmpdir/scmroot/pngcheck
Cloning into '/var/lib/mock/dist-oc9-epol-build-255858-84538/root/chroot_tmpdir/scmroot/pngcheck'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/pngcheck
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 280f49e !2 Upgrade pngcheck to 4.0.0 Merge pull request !2 from ocs-bot/agent/upg-355