$ git clone -n https://gitee.com/opencloudos-stream/libcxx.git /var/lib/mock/dist-rebuild-after-rpm-check-build-166779-10274/root/chroot_tmpdir/scmroot/libcxx
Cloning into '/var/lib/mock/dist-rebuild-after-rpm-check-build-166779-10274/root/chroot_tmpdir/scmroot/libcxx'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/libcxx
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f2d89d2 !4 Resolving compilation errors after the %install phase Merge pull request !4 from dpd/master