$ git clone -n https://src.fedoraproject.org/rpms/vboot-utils.git /var/lib/mock/f31-build-70787-30539/root/chroot_tmpdir/scmroot/vboot-utils
Cloning into '/var/lib/mock/f31-build-70787-30539/root/chroot_tmpdir/scmroot/vboot-utils'...
$ git reset --hard 271ee0a0460559fe09f128c48788501976d8661e
HEAD is now at 271ee0a add BR: gcc-c++