$ git clone -n http://fedora.riscv.rocks:3000/rpms/gcc.git /var/lib/mock/f40-build-807705-145256/root/chroot_tmpdir/scmroot/gcc
Cloning into '/var/lib/mock/f40-build-807705-145256/root/chroot_tmpdir/scmroot/gcc'...
$ git fetch origin 8cecc5c684416c00457906be7a8c6698364beb91:KOJI_FETCH_HEAD
From http://fedora.riscv.rocks:3000/rpms/gcc
 * [new ref]         8cecc5c684416c00457906be7a8c6698364beb91 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8cecc5c Disable objc