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flatcar-install
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#!/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
function ensure_tool() {
local tool="${1}"
command -v "${tool}" >/dev/null || { echo "error: command '${tool}' not found" >&2 ; exit 1; }
}
if command -v lbzip2 >/dev/null; then
BZIP_UTIL=lbzip2
else
BZIP_UTIL=bzip2
ensure_tool "${BZIP_UTIL}"
fi
toolset=( blockdev btrfstune cp cut dd gawk gpg grep head ls lsblk mkdir mkfifo mktemp mount rm sed sort tee udevadm wget wipefs )
for t in "${toolset[@]}"; do ensure_tool "${t}"; done
error_output() {
echo "Error: return code $? from $BASH_COMMAND" >&2
}
default_board() {
if [[ -e /usr/share/flatcar/release ]]; then
gawk --field-separator '=' '/FLATCAR_RELEASE_BOARD=/ { print $2 }' /usr/share/flatcar/release
return
fi
case "$(uname -m)" in
aarch64 ) echo "arm64-usr" ;;
* ) echo "amd64-usr" ;;
esac
}
# Finds an unmounted disk with size greater than 10GB and prints it to stdout,
# otherwise prints an empty line.
find_smallest_unused_disk() {
local disks="$(lsblk -lnpdb -x SIZE -o NAME,SIZE $INCLUDE_MAJOR $EXCLUDE_MAJOR \
| (
while IFS= read -r line; do
drive=$(echo "$line" | awk '{print $1}')
size=$(echo "$line" | awk '{print $2}')
mountpoints=$(lsblk -ln -o MOUNTPOINT "$drive")
device_mapper_usages=$(lsblk -ln -o PATH "$drive" | grep -v "^$drive")
if [[ "$size" -gt 10000000000 ]] && [[ -z "$mountpoints" ]] && [[ -z "${device_mapper_usages}" ]]; then
echo "$drive" "$size"
fi
done))"
# Get smallest disk size by looking at first entry of $disks
local smallestsize="$(echo "$disks" | head -n 1 | cut -d ' ' -f 2)"
# If there more then one disk having the smallest size, sort them alphabetically and take the first one
local smallestdisk="$(echo "$disks" | grep "$smallestsize" | cut -d ' ' -f1 | sort | head -n 1)"
echo "$smallestdisk"
}
# Everything we do should be user-access only!
umask 077
if grep -q "^ID=flatcar$" /etc/os-release; then
source /etc/os-release
[[ -f /usr/share/flatcar/update.conf ]] && source /usr/share/flatcar/update.conf
[[ -f /etc/flatcar/update.conf ]] && source /etc/flatcar/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 /oem/oem-release /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_/' $f)"
fi
done
if [[ "${OEM_ID}" = "qemu" ]] || [[ "${OEM_ID}" = "qemu_uefi" ]]; then
OEM_ID=""
fi
USAGE="Usage: $0 {{-d <device>}|-s} [options]
Options:
-d DEVICE Install Flatcar Container Linux to the given device.
-D Download a Flatcar Container Linux image to the current directory, without installing it
-s EXPERIMENTAL: Install Flatcar Container Linux to the smallest unmounted disk found
(min. size 10GB). It is recommended to use it with -e or -I to filter the
block devices by their major numbers. E.g., -e 7 to exclude loop devices
or -I 8,259 for certain disk types. Read more about the numbers here:
https://www.kernel.org/doc/Documentation/admin-guide/devices.txt.
-V VERSION Version to install (e.g. current, or current-2022 for the LTS 2022 stream) [default: ${VERSION_ID}].
-B BOARD Flatcar Container Linux board to use [default: ${BOARD}].
-C CHANNEL Release channel to use (e.g. beta) [default: ${CHANNEL_ID}].
-I|e <M,..> EXPERIMENTAL (used with -s): List of major device numbers to in-/exclude
when finding the smallest disk.
-o OEM OEM type to install (e.g. 'ami' or '' to force none), using flatcar_production_<OEM>_image.bin.bz2 [default: ${OEM_ID:-(none, i.e., the empty string)}].
-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 and CHANNEL).
-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.
-u Create UEFI boot entry
-y Dry-run. Run some checks and print option settings.
-v Super verbose, for debugging.
-h This ;-).
This tool installs Flatcar Container Linux on a block device. If you PXE booted
Flatcar 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 F88CFEDEFF29A5B4D9523864E25D9AED0593B34A
# pub rsa4096/0593B34A 2018-02-26 [SC]
# F88CFEDEFF29A5B4D9523864E25D9AED0593B34A
# uid [ultimate] Flatcar Buildbot (Official Builds) <[email protected]>
# sub rsa4096/064D542D 2018-02-26 [S] [revoked: 2018-03-14]
# sub rsa4096/D0FC498C 2018-03-14 [S] [revoked: 2018-09-26]
# sub rsa4096/896E394F 2018-09-26 [S] [expired: 2019-09-26]
# sub rsa4096/AF9CF1AF 2019-09-30 [S] [expires: 2020-09-29]
# sub rsa4096/FCBEAB91 2020-08-28 [S] [expires: 2021-08-28]
# sub rsa4096/250D4A42 2021-08-10 [S] [expires: 2022-08-10]
# sub rsa4096/267EC954 2022-08-11 [S] [expires: 2023-08-11]
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-----END PGP PUBLIC KEY BLOCK-----
"
DEVICE=
CLOUDINIT=
IMAGE_FILE=
KEYFILE=
VERSION_SUMMARY='Flatcar Container Linux'
CREATE_UEFI=
WGET_ARGS="--tries 10 --timeout=20 --retry-connrefused"
while getopts "V:B:C:DI:d:o:c:e:i:t:b:k:f:nusyvh" OPTION
do
case $OPTION in
V) VERSION_ID="$OPTARG"; VERSION_SPECIFIED=1 ;;
B) BOARD="$OPTARG" ;;
C) CHANNEL_ID="$OPTARG"; CHANNEL_SPECIFIED=1 ;;
D) DOWNLOAD_ONLY='true';;
I) INCLUDE_MAJOR="-I $OPTARG" ;;
d) DEVICE="$OPTARG" ;;
o) OEM_ID="$OPTARG" ;;
c) CLOUDINIT="$OPTARG" ;;
e) EXCLUDE_MAJOR="-e $OPTARG" ;;
i) IGNITION="$OPTARG" ;;
t) ;; # compatibility option; previously set TMPDIR
b) BASE_URL="${OPTARG%/}" ;;
k) KEYFILE="$OPTARG" ;;
f) IMAGE_FILE="$OPTARG" ;;
n) COPY_NET=1;;
u) CREATE_UEFI=1;;
s) INSTALL_TO_SMALLEST=1 ;;
y) DRY_RUN=1 ;;
v) set -x ;;
h) echo "$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: ${IMAGE_FILE:-(none)}"
}
# Run Device checks, ignore if the download only flag is present
if [[ -z "${DOWNLOAD_ONLY}" ]]; then
# Device is required, must not be a partition, must be writable
if [[ -z "${DEVICE}" ]] && [[ -z "${INSTALL_TO_SMALLEST}" ]]; then
echo "$0: No target block device provided, either -d or -s is required. Or use -D to download image." >&2
echo "$USAGE" >&2
exit 1
fi
if [[ -n "${INSTALL_TO_SMALLEST}" ]]; then
DEVICE="$(find_smallest_unused_disk)"
if [[ -z "${DEVICE}" ]]; then
echo "$0: Could not find smallest disk to install (min. 10GB)." >&2
exit 1
fi
fi
if ! [[ $(lsblk -n -d -o TYPE "${DEVICE}") =~ ^(disk|mpath|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
fi
if [[ -n "${DRY_RUN}" ]]; then
print_settings
exit 0
fi
function is_modified() {
[[ -e "${WORKDIR}/disk_modified" ]]
}
_disk_status=
function get_disk_status() {
[ -n "${_disk_status}" ] ||
read -rt 0.1 _disk_status <> "${WORKDIR}/disk_modified" # Use a timeout of 100ms to behave like a non-blocking read
echo "${_disk_status}"
}
function write_to_disk() {
mkfifo -m 0600 "${WORKDIR}/disk_modified"
# 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
# Communicate success through FIFO when the caller can't act on the return code
(exec 2>/dev/null ; echo "done" > "${WORKDIR}/disk_modified") &
}
function install_from_file() {
if ! [ -r "${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
${BZIP_UTIL} -cd "${IMAGE_FILE}" | write_to_disk
else
write_to_disk < "${IMAGE_FILE}"
fi
VERSION_SUMMARY+=" (from ${IMAGE_FILE})"
}
function prep_url(){
IMAGE_NAME="flatcar_production_image.bin.bz2"
if [[ -n "${OEM_ID}" ]]; then
IMAGE_NAME="flatcar_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|edge)$ ]]; then
CHANNEL_ID="${VERSION_ID}"
VERSION_ID="current"
fi
if [[ -z "${BASE_URL}" ]]; then
BASE_URL="https://${CHANNEL_ID}.release.flatcar-linux.net/${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 ${WGET_ARGS} -qO- "${VERSIONTXT_URL}" | sed -n 's/^FLATCAR_VERSION=//p')
if [[ -z "${VERSION_ID}" ]]; then
echo "$0: version.txt unavailable: ${VERSIONTXT_URL}" >&2
exit 1
fi
echo "Current version of Flatcar Container Linux ${CHANNEL_ID} is ${VERSION_ID}"
fi
IMAGE_URL="${BASE_URL}/${VERSION_ID}/${IMAGE_NAME}"
SIG_NAME="${IMAGE_NAME}.sig"
SIG_URL="${BASE_URL}/${VERSION_ID}/${SIG_NAME}"
if ! wget ${WGET_ARGS} --spider --quiet "${IMAGE_URL}"; then
echo "$0: Image URL unavailable: $IMAGE_URL" >&2
exit 1
fi
if ! wget ${WGET_ARGS} --spider --quiet "${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 ${WGET_ARGS} --no-verbose -O "${WORKDIR}/${SIG_NAME}" "${SIG_URL}"
VERSION_SUMMARY+=" ${CHANNEL_ID} ${VERSION_ID}${OEM_ID:+ (${OEM_ID})}"
}
function download_from_url(){
prep_url
echo "Downloading, writing and verifying ${IMAGE_NAME}..."
if ! wget ${WGET_ARGS} --no-verbose -O "${PWD}/${IMAGE_NAME}" "${IMAGE_URL}"; then
echo "Could not download ${IMAGE_NAME}" >&2
exit 1
fi
if ! gpg --batch --verify "${WORKDIR}/${SIG_NAME}" "${PWD}/${IMAGE_NAME}"; then
echo "Could not verify ${IMAGE_NAME}." >&2
exit 1
fi
}
function install_from_url() {
prep_url
echo "Downloading, writing and verifying ${IMAGE_NAME}..."
if ! wget ${WGET_ARGS} --no-verbose -O - "${IMAGE_URL}" \
| tee >(${BZIP_UTIL} -cd >&3) \
| gpg --batch --verify "${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 ${IMAGE_NAME}" >&2
exit 1
fi 3> >(write_to_disk)
wait
if [ "$(get_disk_status)" != "done" ]; then
echo "write_to_disk: Failed writing image to disk" >&2
exit 1
fi
}
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=$(blkid -l -t "LABEL=ROOT" -o device "${DEVICE}"*)
mkdir -p "${WORKDIR}/rootfs"
case $(blkid -l -t "LABEL=ROOT" -o value -s TYPE "${ROOT_DEV}") in
"btrfs") mount -t btrfs -o subvol=root "${ROOT_DEV}" "${WORKDIR}/rootfs" ;;
*) mount "${ROOT_DEV}" "${WORKDIR}/rootfs" ;;
esac
trap 'umount "${WORKDIR}/rootfs"' EXIT
if [[ -n "${CLOUDINIT}" ]]; then
echo "Installing cloud-config..."
mkdir -p "${WORKDIR}/rootfs/var/lib/flatcar-install"
cp "${CLOUDINIT}" "${WORKDIR}/rootfs/var/lib/flatcar-install/user_data"
fi
if [[ -n "${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=$(blkid -l -t "LABEL=OEM" -o device "${DEVICE}"*)
mkdir -p "${WORKDIR}/oemfs"
mount "${OEM_DEV}" "${WORKDIR}/oemfs" || { btrfstune -f -u "${OEM_DEV}" ; mount "${OEM_DEV}" "${WORKDIR}/oemfs" ; }
trap 'umount "${WORKDIR}/oemfs"' EXIT
echo "Installing Ignition config ${IGNITION}..."
cp "${IGNITION}" "${WORKDIR}/oemfs/config.ign"
)
fi
}
function create_uefi() {
ensure_tool "efibootmgr"
local EFI_APP="bootx64.efi"
if [[ "${BOARD}" = "arm64-usr" ]]; then
EFI_APP="bootaa64.efi"
fi
efibootmgr -c -d "${DEVICE}" -l "\\efi\\boot\\${EFI_APP}" -L "Flatcar Container Linux ${CHANNEL_ID}"
}
WORKDIR=$(mktemp --tmpdir -d flatcar-install.XXXXXXXXXX)
trap 'error_output ; is_modified && wipefs --all --backup "${DEVICE}" ; rm -rf "${WORKDIR}"' EXIT
if [[ "${DOWNLOAD_ONLY}" = 'true' ]]; then
download_from_url
echo "Success! ${VERSION_SUMMARY} has been downloaded to the current directory"
else
if [ -n "${IMAGE_FILE}" ]; then
install_from_file
else
install_from_url
fi
write_cloudinit
write_ignition
if [[ -n "${CREATE_UEFI}" ]]; then
create_uefi
fi
echo "Success! ${VERSION_SUMMARY} is installed on ${DEVICE}"
fi
rm -rf "${WORKDIR}"
trap - EXIT