$ git clone -n https://gitee.com/zhuzhustu/kexec-tools_1.git /var/lib/mock/dist-an23-build-539410-84229/root/chroot_tmpdir/scmroot/kexec-tools_1
Cloning into '/var/lib/mock/dist-an23-build-539410-84229/root/chroot_tmpdir/scmroot/kexec-tools_1'...
$ git fetch origin a9faf0c38355d582635c5c4953add987e0681bff:KOJI_FETCH_HEAD
From https://gitee.com/zhuzhustu/kexec-tools_1
 * [new ref]         a9faf0c38355d582635c5c4953add987e0681bff -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a9faf0c update kexec-tools.spec.