$ git clone -n https://gitee.com/bbrucezhang/llvm15.git /var/lib/mock/dist-oc9-epol-build-185719-80233/root/chroot_tmpdir/scmroot/llvm15
Cloning into '/var/lib/mock/dist-oc9-epol-build-185719-80233/root/chroot_tmpdir/scmroot/llvm15'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/bbrucezhang/llvm15
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3004d70 init