$ git clone -n https://gitee.com/opencloudos-stream/tomcat.git /var/lib/mock/dist-ocs23-base-build-321290-33902/root/chroot_tmpdir/scmroot/tomcat
Cloning into '/var/lib/mock/dist-ocs23-base-build-321290-33902/root/chroot_tmpdir/scmroot/tomcat'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/tomcat
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7854f77 !15 Adjust spec file for rpm-upgrade. Merge pull request !15 from doriscchao/master