$ git clone -n https://src.fedoraproject.org/rpms/chromium.git /var/lib/mock/f40-build-59220169-6571998/root/chroot_tmpdir/scmroot/chromium
Cloning into '/var/lib/mock/f40-build-59220169-6571998/root/chroot_tmpdir/scmroot/chromium'...
$ git fetch origin a11ab82a27864a7d5225feae334f17985761fc95:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/chromium
 * [new ref]         a11ab82a27864a7d5225feae334f17985761fc95 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a11ab82 Merge branch 'rawhide' into f40