$ git clone -n https://gitee.com/src-opencloudos-rpms/alertmanager.git /var/lib/mock/dist-oc9-epol-build-52938-14768/root/chroot_tmpdir/scmroot/alertmanager
Cloning into '/var/lib/mock/dist-oc9-epol-build-52938-14768/root/chroot_tmpdir/scmroot/alertmanager'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/alertmanager
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 564dfe4 import alertmanager-0.25.0-4.tl4