$ git clone -n https://gitee.com/mgb01105731/nginx.git /var/lib/mock/dist-an23-build-354160-71027/root/chroot_tmpdir/scmroot/nginx
Cloning into '/var/lib/mock/dist-an23-build-354160-71027/root/chroot_tmpdir/scmroot/nginx'...
$ git fetch origin a23:KOJI_FETCH_HEAD
From https://gitee.com/mgb01105731/nginx
 * [new branch]      a23        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0089307 update to 1.25.4