$ git clone -n https://src.fedoraproject.org/rpms/chromiumos-platform.git /var/lib/mock/f41-build-857168-167941/root/chroot_tmpdir/scmroot/chromiumos-platform
Cloning into '/var/lib/mock/f41-build-857168-167941/root/chroot_tmpdir/scmroot/chromiumos-platform'...
$ git fetch origin 27b256ac5609ff6bd94a7d1b9bc21164e2bd8947:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/chromiumos-platform
 * [new ref]         27b256ac5609ff6bd94a7d1b9bc21164e2bd8947 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 27b256a Further fix for sommelier on non-ChromeOS systems