$ git clone -n https://gitee.com/ocs-upgrade/mercurial.git /var/lib/mock/dist-ocs23-build-212340-15360/root/chroot_tmpdir/scmroot/mercurial
Cloning into '/var/lib/mock/dist-ocs23-build-212340-15360/root/chroot_tmpdir/scmroot/mercurial'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/ocs-upgrade/mercurial
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0d21dfb Upgrade to version 6.8