def do_rootfs_wicenv(d):
    wicvars = d.getVar('WICVARS')
    if not wicvars:
        return

    stdir = d.getVar('STAGING_DIR')
    outdir = os.path.join(stdir, d.getVar('MACHINE'), 'imgdata')
    bb.utils.mkdirhier(outdir)
    basename = d.getVar('IMAGE_BASENAME')
    with open(os.path.join(outdir, basename) + '.env', 'w') as envf:
        for var in wicvars.split():
            value = d.getVar(var)
            if value:
                envf.write('%s="%s"\n' % (var, value.strip()))
    envf.close()
    # Copy .env file to deploy directory for later use with stand alone wic
    depdir = d.getVar('IMGDEPLOYDIR')
    bb.utils.copyfile(os.path.join(outdir, basename) + '.env', os.path.join(depdir, basename) + '.env')

do_rootfs_wicenv(d)