$ git clone -n https://gitee.com/Weisson/gcc.git /var/lib/mock/dist-an23-build-456860-73661/root/chroot_tmpdir/scmroot/gcc
Cloning into '/var/lib/mock/dist-an23-build-456860-73661/root/chroot_tmpdir/scmroot/gcc'...
$ git fetch origin e250d185ef3a663f18861a6c3ba00bf85351da45:KOJI_FETCH_HEAD
From https://gitee.com/Weisson/gcc
 * [new ref]         e250d185ef3a663f18861a6c3ba00bf85351da45 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e250d18 Add RISC-V ISA extensions.