/*
 * Copyright (C) 2021 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

// By default this device uses hardware-wrapped keys for storage encryption,
// which is intended to offer increased security over the traditional method
// (software keys).  However, hardware-wrapped keys aren't compatible with
// FIPS-140 certification of the encryption hardware, and hence we have to
// disable the use of them in FIPS mode.  This requires having two fstab files:
// one for the default mode, and one for FIPS mode selectable via
// androidboot.fstab_suffix on the kernel command line.  These fstabs should be
// identical with the exception of the encryption settings, so to keep them in
// sync the rules below generate them from a template file.

soong_namespace {
    imports: [
        "device/google/zuma",
    ],
}

package {
    // See: http://go/android-license-faq
    // A large-scale-change added 'default_applicable_licenses' to import
    // all of the 'license_kinds' from "device_google_zuma_license"
    // to get the below license kinds:
    //   SPDX-license-identifier-Apache-2.0
    default_applicable_licenses: ["device_google_zuma_license"],
}

genrule {
    name: "gen_fstab.zuma-hw-encrypt",
    srcs: [
        ":fstab.zuma.common",
        "fstab.zuma.ext4",
    ],
    out: ["fstab.zuma"],
    cmd: "sed -e s/@fileencryption@/fileencryption=:aes-256-hctr2:inlinecrypt_optimized+wrappedkey_v0/" +
        " -e s/@inlinecrypt@/inlinecrypt/ " +
        " -e s/@metadata_encryption@/metadata_encryption=:wrappedkey_v0/ $(in) > $(out)",
}

genrule {
    name: "gen_fstab.zuma-sw-encrypt",
    srcs: [
        ":fstab.zuma.common",
        "fstab.zuma.ext4",
    ],
    out: ["fstab.zuma"],
    cmd: "sed -e s/@fileencryption@/fileencryption=aes-256-xts:aes-256-hctr2/" +
        " -e s/@inlinecrypt@// " +
        " -e s/@metadata_encryption@/metadata_encryption=/ $(in) > $(out)",
}

genrule {
    name: "gen_fstab.zuma-no-encrypt",
    srcs: [
        ":fstab.zuma.common",
        "fstab.zuma.ext4",
    ],
    out: ["fstab.zuma"],
    cmd: "sed -e s/@fileencryption@//" +
        " -e s/@inlinecrypt@// " +
        " -e s/@metadata_encryption@// $(in) > $(out)",
}

genrule {
    name: "gen_fstab.zuma-fips",
    srcs: [
        ":fstab.zuma.common",
        "fstab.zuma.ext4",
    ],
    out: ["fstab.zuma-fips"],
    cmd: "sed -e s/@fileencryption@/fileencryption=aes-256-xts/" +
        " -e s/@inlinecrypt@/inlinecrypt/ " +
        " -e s/@metadata_encryption@/metadata_encryption=aes-256-xts/ $(in) > $(out)",
}

prebuilt_etc {
    name: "fstab.zuma",
    src: ":gen_fstab.zuma-hw-encrypt",
    vendor: true,
    vendor_ramdisk_available: true,
}

prebuilt_etc {
    name: "fstab.zuma-fips",
    src: ":gen_fstab.zuma-fips",
    vendor: true,
    vendor_ramdisk_available: true,
}
