$ git clone -n https://gitee.com/src-opencloudos-rpms/libpng12.git /var/lib/mock/dist-oc8-build-237009-82349/root/chroot_tmpdir/scmroot/libpng12
Cloning into '/var/lib/mock/dist-oc8-build-237009-82349/root/chroot_tmpdir/scmroot/libpng12'...
$ git fetch origin e14ee9f32e71d1eb9d688a37f402dbe76dafcdf3:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/libpng12
 * [new ref]         e14ee9f32e71d1eb9d688a37f402dbe76dafcdf3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e14ee9f import libpng12-1.2.57-6.tl3