$ git clone -n https://gitee.com/zhuzhustu/nss-pem.git /var/lib/mock/dist-an23-build-524907-77908/root/chroot_tmpdir/scmroot/nss-pem
Cloning into '/var/lib/mock/dist-an23-build-524907-77908/root/chroot_tmpdir/scmroot/nss-pem'...
$ git fetch origin 600e0f6d2873680b9869c261958610e51c1608e5:KOJI_FETCH_HEAD
From https://gitee.com/zhuzhustu/nss-pem
 * [new ref]         600e0f6d2873680b9869c261958610e51c1608e5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 600e0f6 update nss-pem.spec.