$ git clone -n https://gitee.com/bbrucezhang/chromium.git /var/lib/mock/dist-oc9-epol-build-185944-80262/root/chroot_tmpdir/scmroot/chromium
Cloning into '/var/lib/mock/dist-oc9-epol-build-185944-80262/root/chroot_tmpdir/scmroot/chromium'...
$ git fetch origin epol:KOJI_FETCH_HEAD
From https://gitee.com/bbrucezhang/chromium
 * [new branch]      epol       -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1794fa0 fix