$ git clone -n https://gitee.com/src-opencloudos-rpms/petsc.git /var/lib/mock/dist-oc9-epol-build-55038-14778/root/chroot_tmpdir/scmroot/petsc
Cloning into '/var/lib/mock/dist-oc9-epol-build-55038-14778/root/chroot_tmpdir/scmroot/petsc'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/petsc
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1210827 import petsc-3.18.5-2.tl4