#!/bin/bash
# Copyright (c) 2013 The CoreOS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

set -e -o pipefail

error_output() {
    echo "Error: return code $? from $BASH_COMMAND" >&2
}

default_board() {
    if [[ -e /usr/share/coreos/release ]]; then
        gawk --field-separator '=' '/COREOS_RELEASE_BOARD=/ { print $2 }' /usr/share/coreos/release
        return
    fi

    case "$(uname -m)" in
    aarch64 ) echo "arm64-usr" ;;
    * )       echo "amd64-usr" ;;
    esac
}

# Everything we do should be user-access only!
umask 077

if grep -q "^ID=coreos$" /etc/os-release; then
    source /etc/os-release
    [[ -f /usr/share/coreos/update.conf ]] && source /usr/share/coreos/update.conf
    [[ -f /etc/coreos/update.conf ]] && source /etc/coreos/update.conf
fi

# Fall back on the current stable if os-release isn't useful
: ${VERSION_ID:=current}
CHANNEL_ID=${GROUP:-stable}

BOARD=$(default_board)

OEM_ID=
for f in /usr/share/oem/oem-release /etc/oem-release; do
    if [[ -e $f ]]; then
        # Pull in OEM information too, but prefixing variables with OEM_
        eval "$(sed -e 's/^/OEM_/' $f)"
    fi
done

USAGE="Usage: $0 -d <device> [options]
Options:
    -d DEVICE   Install Container Linux to the given device.
    -V VERSION  Version to install (e.g. current) [default: ${VERSION_ID}].
    -B BOARD    Container Linux board to use [default: ${BOARD}].
    -C CHANNEL  Release channel to use (e.g. beta) [default: ${CHANNEL_ID}].
    -o OEM      OEM type to install (e.g. ami) [default: ${OEM_ID:-(none)}].
    -c CLOUD    Insert a cloud-init config to be executed on boot.
    -i IGNITION Insert an Ignition config to be executed on boot.
    -b BASEURL  URL to the image mirror (overrides BOARD).
    -k KEYFILE  Override default GPG key for verifying image signature.
    -f IMAGE    Install unverified local image file to disk instead of fetching.
    -n          Copy generated network units to the root partition.
    -y          Dry-run.  Run some checks and print option settings.
    -v          Super verbose, for debugging.
    -h          This ;-).

This tool installs CoreOS Container Linux on a block device. If you PXE booted
Container Linux on a machine then use this tool to make a permanent install.
"

# Image signing key:
# $ gpg2 --list-keys --list-options show-unusable-subkeys \
#     --keyid-format SHORT 04127D0BFABEC8871FFB2CCE50E0885593D2DCB4
# pub   rsa4096/93D2DCB4 2013-09-06 [SC]
#       04127D0BFABEC8871FFB2CCE50E0885593D2DCB4
# uid         [ unknown] CoreOS Buildbot (Offical Builds) <buildbot@coreos.com>
# sub   rsa4096/74E7E361 2013-09-06 [S] [expired: 2014-09-06]
# sub   rsa4096/E5676EFC 2014-09-08 [S] [expired: 2015-09-08]
# sub   rsa4096/1CB5FA26 2015-08-31 [S] [expired: 2017-08-30]
# sub   rsa4096/B58844F1 2015-11-20 [S] [revoked: 2016-05-16]
# sub   rsa4096/2E16137F 2016-05-16 [S] [expired: 2017-05-16]
# sub   rsa4096/EF4B4ED9 2017-05-22 [S] [expired: 2018-06-01]
# sub   rsa4096/0638EB2F 2018-02-10 [S] [expires: 2019-06-01]
# sub   rsa4096/67B3CA0E 2019-02-04 [S] [expires: 2021-06-01]
GPG_LONG_ID="50E0885593D2DCB4"
GPG_KEY="-----BEGIN PGP PUBLIC KEY BLOCK-----

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ZczgoliOhiUX0kRp12LvAYbQK/NUXyc7rtPdWaOUHtU1nQQiVUs70pbfatdQazTl
c4Jv9INSjBcQ2f8Bi7mKFaIDEUgGgUuRJihTYsBaKhxNaDqRro3pm0EDP0GMottp
QVP4rtqNcCjndbY7VhNcBkoB9F9DT+/uPH2+IlmtYDJK2rQv+fGVQYlDVB3nCOtM
gIh5G4uBMP3cvc2w6EUtvKw1+CnBkn9GNTIda9e+IkGcxBa5e6GsrsD+uFZWH89Z
kyYDYO8lRxhMfw9pufVJHQz3RH3BQ+cDXQKB4hG/PLFVuKp4/dxRv1wq3Wqjtich
u8FHnUTnJIo36yYZ5RcepLueSkYSMeSgCZG3Zmq6AkMKggwEa9c4w9xp
=28ZS
-----END PGP PUBLIC KEY BLOCK-----
"

DEVICE=
CLOUDINIT=
IMAGE_FILE=
KEYFILE=
VERSION_SUMMARY='CoreOS Container Linux'

while getopts "V:B:C:d:o:c:i:t:b:k:f:nyvh" OPTION
do
    case $OPTION in
        V) VERSION_ID="$OPTARG"; VERSION_SPECIFIED=1 ;;
        B) BOARD="$OPTARG" ;;
        C) CHANNEL_ID="$OPTARG"; CHANNEL_SPECIFIED=1 ;;
        d) DEVICE="$OPTARG" ;;
        o) OEM_ID="$OPTARG" ;;
        c) CLOUDINIT="$OPTARG" ;;
        i) IGNITION="$OPTARG" ;;
        t) ;; # compatibility option; previously set TMPDIR
        b) BASE_URL="${OPTARG%/}" ;;
        k) KEYFILE="$OPTARG" ;;
        f) IMAGE_FILE="$OPTARG" ;;
        n) COPY_NET=1;;
        y) DRY_RUN=1 ;;
        v) set -x ;;
        h) echo "$USAGE"; exit;;
        *) exit 1;;
    esac
done

function print_settings() {
    echo "\
Settings:
    VERSION:  ${VERSION_ID}
    BOARD:    ${BOARD}
    CHANNEL:  ${CHANNEL_ID}
    OEM:      ${OEM_ID:-(none)}
    CLOUD:    ${CLOUDINIT:-(none)}
    IGNITION: ${IGNITION:-(none)}
    BASEURL:  ${BASE_URL:-(none)}
    KEYFILE:  ${KEYFILE:-(none)}
    IMAGE:    ${IMAGE_FILE:-(none)}"
}

# Device is required, must not be a partition, must be writable
if [[ -z "${DEVICE}" ]]; then
    echo "$0: No target block device provided, -d is required." >&2
    echo "$USAGE" >&2
    exit 1
fi

if ! [[ $(lsblk -n -d -o TYPE "${DEVICE}") =~ ^(disk|loop|lvm)$ ]]; then
    echo "$0: Target block device (${DEVICE}) is not a full disk." >&2
    exit 1
fi

if [[ ! -w "${DEVICE}" ]]; then
    echo "$0: Target block device (${DEVICE}) is not writable (are you root?)" >&2
    exit 1
fi

if [[ -n "${CLOUDINIT}" ]]; then
    if [[ ! -f "${CLOUDINIT}" ]]; then
        echo "$0: Cloud config file (${CLOUDINIT}) does not exist." >&2
        exit 1
    fi

    if type -P coreos-cloudinit >/dev/null; then
        if ! coreos-cloudinit -from-file="${CLOUDINIT}" -validate; then
            echo "$0: Cloud config file (${CLOUDINIT}) is not valid." >&2
            exit 1
        fi
    else
        echo "$0: coreos-cloudinit not found. Could not validate config. Continuing..." >&2
    fi
fi

if [[ -n "${IGNITION}" ]]; then
    if [[ ! -f "${IGNITION}" ]]; then
        echo "$0: Ignition config file (${IGNITION}) does not exist." >&2
        exit 1
    fi
fi

if [[ -n "${DRY_RUN}" ]]; then
    print_settings
    exit 0
fi

function is_modified() [[ -e "${WORKDIR}/disk_modified" ]]

_disk_status=
function wait_for_disk() {
    [ -n "${_disk_status}" ] ||
    read -rt 7200 _disk_status <> "${WORKDIR}/disk_modified"
}

function write_to_disk() {
    mkfifo -m 0600 "${WORKDIR}/disk_modified"
    trap '(exec 2>/dev/null ; echo done > "${WORKDIR}/disk_modified") &' RETURN

    # We are at the point of no return, so wipe disk labels missed below.
    # In particular, ZFS writes labels in the last half-MiB of the disk.
    dd conv=nocreat count=1024 if=/dev/zero of="${DEVICE}" \
        seek=$(($(blockdev --getsz "${DEVICE}") - 1024)) status=none

    dd bs=1M conv=nocreat of="${DEVICE}" status=none

    # inform the OS of partition table changes
    udevadm settle
    local try
    for try in 0 1 2 4; do
        sleep "$try"  # Give the device a bit more time on each attempt.
        blockdev --rereadpt "${DEVICE}" && unset try && break ||
        echo "Failed to reread partitions on ${DEVICE}" >&2
    done
    [ -z "$try" ] || exit 1
    udevadm settle
}

function install_from_file() {
    if ! [ -r "${IMAGE_FILE}" ]; then
        echo "$0: Could not read image file: ${IMAGE_FILE}" >&2
        exit 1
    fi

    echo "Writing ${IMAGE_FILE}..."
    if [[ "${IMAGE_FILE}" =~ \.bz2$ ]]; then
        bzip2 -cd "${IMAGE_FILE}" | write_to_disk
    else
        write_to_disk < "${IMAGE_FILE}"
    fi

    VERSION_SUMMARY+=" (from ${IMAGE_FILE})"
}

function install_from_url() {
    # Ensure that required executables exist before proceeding
    type -P wget >/dev/null || { echo 'Missing wget!' >&2 ; exit 1 ; }
    type -P gpg >/dev/null || { echo 'Missing gpg!' >&2 ; exit 1 ; }

    local IMAGE_NAME="coreos_production_image.bin.bz2"
    if [[ -n "${OEM_ID}" ]]; then
        IMAGE_NAME="coreos_production_${OEM_ID}_image.bin.bz2"
    fi

    if [[ -n "${CHANNEL_SPECIFIED-}" && -z "${VERSION_SPECIFIED-}" ]]; then
        VERSION_ID=current
    fi

    # for compatibility with old versions that didn't support channels
    if [[ "${VERSION_ID}" =~ ^(alpha|beta|stable)$ ]]; then
        CHANNEL_ID="${VERSION_ID}"
        VERSION_ID="current"
    fi

    if [[ -z "${BASE_URL}" ]]; then
        BASE_URL="https://${CHANNEL_ID}.release.core-os.net/${BOARD}"
    fi

    # if the version is "current", resolve the actual version number
    if [[ "${VERSION_ID}" == "current" ]]; then
        local VERSIONTXT_URL="${BASE_URL}/${VERSION_ID}/version.txt"
        VERSION_ID=$(wget -qO- "${VERSIONTXT_URL}" | sed -n 's/^COREOS_VERSION=//p')
        if [[ -z "${VERSION_ID}" ]]; then
            echo "$0: version.txt unavailable: ${VERSIONTXT_URL}" >&2
            exit 1
        fi
        echo "Current version of CoreOS Container Linux ${CHANNEL_ID} is ${VERSION_ID}"
    fi

    local IMAGE_URL="${BASE_URL}/${VERSION_ID}/${IMAGE_NAME}"
    local SIG_NAME="${IMAGE_NAME}.sig"
    local SIG_URL="${BASE_URL}/${VERSION_ID}/${SIG_NAME}"

    if ! wget --spider --quiet "${IMAGE_URL}"; then
        echo "$0: Image URL unavailable: $IMAGE_URL" >&2
        exit 1
    fi

    if ! wget --spider --quiet "${SIG_URL}"; then
        echo "$0: Image signature unavailable: $SIG_URL" >&2
        exit 1
    fi

    # Setup GnuPG for verifying the image signature
    export GNUPGHOME="${WORKDIR}/gnupg"
    mkdir -p "${GNUPGHOME}"
    if [ -n "${KEYFILE}" ]; then
        gpg --batch --quiet --import < "${KEYFILE}"
    else
        gpg --batch --quiet --import <<< "${GPG_KEY}"
    fi

    echo "Downloading the signature for ${IMAGE_URL}..."
    wget --no-verbose -O "${WORKDIR}/${SIG_NAME}" "${SIG_URL}"

    echo "Downloading, writing and verifying ${IMAGE_NAME}..."
    if ! wget --no-verbose -O - "${IMAGE_URL}" \
        | tee >(bzip2 -cd >&3) \
        | gpg --batch --trusted-key "${GPG_LONG_ID}" \
            --verify "${WORKDIR}/${SIG_NAME}" -
    then
        local EEND=( "${PIPESTATUS[@]}" )
        [ ${EEND[0]} -ne 0 ] && echo "${EEND[0]}: Download of ${IMAGE_NAME} did not complete" >&2
        [ ${EEND[1]} -ne 0 ] && echo "${EEND[1]}: Cannot expand ${IMAGE_NAME} to ${DEVICE}" >&2
        [ ${EEND[2]} -ne 0 ] && echo "${EEND[2]}: GPG signature verification failed for ${IMAGE_NAME}" >&2
        exit 1
    fi 3> >(write_to_disk)

    VERSION_SUMMARY+=" ${CHANNEL_ID} ${VERSION_ID}${OEM_ID:+ (${OEM_ID})}"
}

function write_cloudinit() if [[ -n "${CLOUDINIT}${COPY_NET}" ]]; then
    # The ROOT partition should be #9 but make no assumptions here!
    # Also don't mount by label directly in case other devices conflict.
    local ROOT_DEV=$(blkid -t "LABEL=ROOT" -o device "${DEVICE}"*)

    mkdir -p "${WORKDIR}/rootfs"
    case $(blkid -t "LABEL=ROOT" -o value -s TYPE "${ROOT_DEV}") in
      "btrfs") mount -t btrfs -o subvol=root "${ROOT_DEV}" "${WORKDIR}/rootfs" ;;
      *)       mount "${ROOT_DEV}" "${WORKDIR}/rootfs" ;;
    esac
    trap 'umount "${WORKDIR}/rootfs"' RETURN

    if [[ -n "${CLOUDINIT}" ]]; then
      echo "Installing cloud-config..."
      mkdir -p "${WORKDIR}/rootfs/var/lib/coreos-install"
      cp "${CLOUDINIT}" "${WORKDIR}/rootfs/var/lib/coreos-install/user_data"
    fi

    if [[ -n "${COPY_NET}" ]]; then
      echo "Copying network units to root partition."
      # Copy the entire directory, do not overwrite anything that might exist there, keep permissions, and copy the resolve.conf link as a file.
      cp --recursive --no-clobber --preserve --dereference /run/systemd/network/* "${WORKDIR}/rootfs/etc/systemd/network"
    fi
fi

function write_ignition() if [[ -n "${IGNITION}" ]]; then
    # The OEM partition should be #6 but make no assumptions here!
    # Also don't mount by label directly in case other devices conflict.
    local OEM_DEV=$(blkid -t "LABEL=OEM" -o device "${DEVICE}"*)

    mkdir -p "${WORKDIR}/oemfs"
    mount "${OEM_DEV}" "${WORKDIR}/oemfs"
    trap 'umount "${WORKDIR}/oemfs"' RETURN

    echo "Installing Ignition config ${IGNITION}..."
    cp "${IGNITION}" "${WORKDIR}/oemfs/config.ign"
fi

WORKDIR=$(mktemp --tmpdir -d coreos-install.XXXXXXXXXX)
trap 'error_output ; is_modified && wipefs --all --backup "${DEVICE}" ; rm -rf "${WORKDIR}"' EXIT

if [ -n "${IMAGE_FILE}" ]; then
    install_from_file
else
    install_from_url
fi
wait_for_disk
write_cloudinit
write_ignition

rm -rf "${WORKDIR}"
trap - EXIT

echo "Success! ${VERSION_SUMMARY} is installed on ${DEVICE}"