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selfprivacy-nixos-infect
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selfprivacy-nixos-infect/nixos-infect

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#! /usr/bin/env bash
# More info at:
# - https://github.com/elitak/nixos-infect
# - https://git.selfprivacy.org/SelfPrivacy/selfprivacy-nixos-infect
: "${API_TOKEN:?API_TOKEN variable is not set}"
: "${DOMAIN:?DOMAIN variable is not set}"
: "${LUSER:?LUSER variable is not set}"
: "${HOSTNAME:?HOSTNAME variable is not set}"
: "${PROVIDER:?PROVIDER variable is not set}"
: "${DNS_PROVIDER_TYPE:?DNS_PROVIDER_TYPE variable is not set}"
: "${STAGING_ACME:?STAGING_ACME variable is not set}"
: "${CF_TOKEN:?CF_TOKEN variable is not set}"
: "${DB_PASSWORD:?DB_PASSWORD variable is not set}"
: "${ENCODED_PASSWORD:?ENCODED_PASSWORD variable is not set}"
: "${NIX_VERSION:?NIX_VERSION variable is not set}"
: "${NIXOS_CONFIG_NAME:?NIXOS_CONFIG_NAME variable is not set}"
: "${CONFIG_URL:?CONFIG_URL variable is not set}"
readonly LOCAL_FLAKE_DIR="/etc/nixos"
readonly SECRETS_FILEPATH="/etc/selfprivacy/secrets.json"
# Merge original userdata.json with deployment specific fields and print result.
genUserdata() {
local password HASHED_PASSWORD userdata_infect
password=$(printf "%s" "$ENCODED_PASSWORD" | base64 --decode)
HASHED_PASSWORD=$(mkpasswd -m sha-512 "$password")
userdata_infect=$(cat << EOF
{
"dns": {
"provider": "$DNS_PROVIDER_TYPE",
"useStagingACME": $STAGING_ACME
},
"server": {
"provider": "$PROVIDER"
},
"domain": "$DOMAIN",
"hashedMasterPassword": "$HASHED_PASSWORD",
"hostname": "$HOSTNAME",
"username": "$LUSER"
}
EOF
)
jq -s '.[0] * .[1]' \
"${1:?no userdata.json given to merge with}" <(printf "%s" "$userdata_infect")
}
genSecrets() {
local ESCAPED_PASSWORD
ESCAPED_PASSWORD=$(printf "%s" "$ENCODED_PASSWORD" | base64 --decode | jq -Rs .)
cat << EOF
{
"api": {
"token": "$API_TOKEN",
"skippedMigrations": ["migrate_to_selfprivacy_channel", "mount_volume"]
},
"databasePassword": "$DB_PASSWORD",
"dns": {
"apiKey": "$CF_TOKEN"
},
"modules": {
"nextcloud": {
"adminPassword": $ESCAPED_PASSWORD,
"databasePassword": $ESCAPED_PASSWORD,
}
},
"resticPassword": $ESCAPED_PASSWORD
}
EOF
}
genHardwareConfiguration() {
local bootcfg
if ((isEFI)); then
bootcfg=$(cat << EOF
boot.loader.grub = {
efiSupport = true;
efiInstallAsRemovable = true;
device = "nodev";
};
fileSystems."/boot" = { device = "$ESP"; fsType = "vfat"; };
EOF
)
else
bootcfg=$(cat << EOF
boot.loader.grub.device = "$GRUBDEV";
EOF
)
fi
cat << EOF
{ modulesPath, ... }:
{
imports = [ (modulesPath + "/profiles/qemu-guest.nix") ];
$bootcfg
boot.initrd.kernelModules = [ "nvme" ];
fileSystems."/" = { device = "$ROOTFSDEV"; fsType = "$ROOTFSTYPE"; };
}
EOF
}
setupConf() {
mkdir -p ${LOCAL_FLAKE_DIR}
if ! curl "${CONFIG_URL}" \
| tar -xz -C ${LOCAL_FLAKE_DIR} --strip-components=1 --exclude=".*"
then
echo "Error downloading/extracting top level flake configuration!"
exit 1
fi
# generate and write hardware-configuration.nix
genHardwareConfiguration > ${LOCAL_FLAKE_DIR}/hardware-configuration.nix
# generate infected userdata based on original
local userdataInfected
userdataInfected="$(genUserdata ${LOCAL_FLAKE_DIR}/userdata.json)"
printf "%s" "$userdataInfected" > ${LOCAL_FLAKE_DIR}/userdata.json
# generate and write secrets
local secrets
secrets="$(genSecrets)"
install -m0600 <(printf "%s" "$secrets") -DT ${SECRETS_FILEPATH}
}
makeSwap() {
# TODO check currently available swapspace first
swapFile=$(mktemp /tmp/nixos-infect.XXXXX.swp)
dd if=/dev/zero "of=$swapFile" bs=1M count=$((1*1024))
chmod 0600 "$swapFile"
mkswap "$swapFile"
swapon -v "$swapFile"
}
removeSwap() {
swapoff -a
rm -vf /tmp/nixos-infect.*.swp
}
findESP() {
local esp
for d in /boot/EFI /boot/efi /boot; do
[[ ! -d "$d" ]] && continue
[[ "$d" == "$(df "$d" --output=target | sed 1d)" ]] \
&& esp="$(df "$d" --output=source | sed 1d)" \
&& break
done
[[ -z "$esp" ]] && { echo "ERROR: No ESP mount point found"; return 1; }
for uuid in /dev/disk/by-uuid/*; do
[[ $(readlink -f "$uuid") == "$esp" ]] && echo "$uuid" && return 0
done
}
prepareEnv() {
isEFI=0
[ -d /sys/firmware/efi ] && isEFI=1
if ((isEFI)); then
ESP="$(findESP)"
else
for GRUBDEV in /dev/vda /dev/sda /dev/nvme0n1; do
[[ -e $GRUBDEV ]] && break;
done
fi
# Retrieve root fs block device
# (get root mount) (get partition or logical volume)
ROOTFSDEV=$(mount | grep "on / type" | awk '{print $1;}')
ROOTFSTYPE=$(df "$ROOTFSDEV" --output=fstype | sed 1d)
# DigitalOcean doesn't seem to set USER while running user data
export USER="root"
export HOME="/root"
# Nix installer tries to use sudo regardless of whether we're already uid 0
#which sudo || { sudo() { eval "$@"; }; export -f sudo; }
# shellcheck disable=SC2174
mkdir -p -m 0755 /nix
}
fakeCurlUsingWget() {
# Use adapted wget if curl is missing
which wget && { \
curl() {
eval "wget $(
(local isStdout=1
for arg in "$@"; do
case "$arg" in
"-o")
echo "-O";
isStdout=0
;;
"-O")
isStdout=0
;;
"-L")
;;
*)
echo "$arg"
;;
esac
done;
[[ $isStdout -eq 1 ]] && echo "-O-"
)| tr '\n' ' '
)"
}; export -f curl; }
}
req() {
type "$1" > /dev/null 2>&1 || which "$1" > /dev/null 2>&1
}
checkEnv() {
[[ "$(whoami)" == "root" ]] || { echo "ERROR: Must run as root"; return 1; }
# Perform some easy fixups before checking
# TODO prevent multiple calls to apt-get update
(which dnf && dnf install -y perl-Digest-SHA) || true # Fedora 24
which xzcat || (which yum && yum install -y xz-utils) \
|| (which apt-get && apt-get update && apt-get install -y xz-utils) \
|| true
which curl || fakeCurlUsingWget \
|| (which apt-get && apt-get update && apt-get install -y curl) \
|| true
req curl || req wget || { echo "ERROR: Missing both curl and wget"; return 1; }
req xzcat || { echo "ERROR: Missing xzcat"; return 1; }
req awk || { echo "ERROR: Missing awk"; return 1; }
req cut || req df || { echo "ERROR: Missing coreutils (cut, df)"; return 1; }
}
# Download and execute the nix installer script.
installNix() {
local nixReleaseBase='https://releases.nixos.org'
local installURL="${nixReleaseBase}/nix/nix-${NIX_VERSION}/install"
local shaURL="${installURL}.sha256"
local sha tmpNixInstall
# temporary destination for install script
tmpNixInstall="$(mktemp -t nix-install-XXXXXXXXXX)"
if [[ ! -f "${tmpNixInstall}" ]]; then
echo "Failed creating a temporary file for Nix install script!"
return 1
fi
echo "Downloading install script from ${installURL}..."
if ! curl "${installURL}" -o "${tmpNixInstall}" &>/dev/null; then
echo "Failure while downloading Nix install script!"
return 1
fi
if ! sha="$(curl "${shaURL}")"; then
echo "Failure while downloading Nix install script sha!"
return 1
fi
echo "Validating Nix install script checksum..."
if ! echo "${sha} ${tmpNixInstall}" | sha256sum -c; then
echo "Checksum validation failed!"
return 1
fi
echo "Running nix installer..."
if $SHELL "${tmpNixInstall}" \
--daemon --no-channel-add --daemon-user-count 4; then
echo "Nix is installed"
rm "${tmpNixInstall}"
else
echo "Nix installation script failed!"
return 1
fi
}
infect() {
# install multiuser (system-wide with nix-daemon) Nix in the current system
if ! installNix; then
echo "Nix installation failed!"
exit 1
fi
# this is needed solely for accpeting the sp-module subflake
# see https://github.com/NixOS/nix/issues/3978#issuecomment-952418478
/root/.nix-profile/bin/nix flake lock ${LOCAL_FLAKE_DIR} \
--extra-experimental-features "nix-command flakes" \
--update-input sp-modules
echo "nix build the configuration flake..."
if ! /root/.nix-profile/bin/nix build \
--extra-experimental-features "nix-command flakes" \
--profile /nix/var/nix/profiles/system \
${LOCAL_FLAKE_DIR}/#nixosConfigurations.sp-nixos.config.system.build.toplevel
then
echo "Failed!"
exit 1
fi
# Reify resolv.conf (???)
[[ -L /etc/resolv.conf ]] && mv -v /etc/resolv.conf /etc/resolv.conf.lnk && cat /etc/resolv.conf.lnk > /etc/resolv.conf
# Stage the Nix coup d'état
touch /etc/NIXOS
echo etc/nixos > /etc/NIXOS_LUSTRATE
echo etc/resolv.conf >> /etc/NIXOS_LUSTRATE
echo ${SECRETS_FILEPATH} >> /etc/NIXOS_LUSTRATE
rm -rf /boot.bak
((isEFI)) && umount "$ESP"
mv -v /boot /boot.bak
if ((isEFI)); then
mkdir /boot
mount "$ESP" /boot
find /boot -depth ! -path /boot -exec rm -rf {} +
fi
echo "make configuration boot by default..."
if ! /nix/var/nix/profiles/system/bin/switch-to-configuration boot; then
echo "Failed!"; exit 1
fi
# Remove nix installed by the "install" script.
rm -fv /nix/var/nix/profiles/default*
/nix/var/nix/profiles/system/sw/bin/nix-collect-garbage
}
set -o pipefail
set -o nounset
set -o xtrace
set -o errexit
apt update
apt install -y git tar curl jq
checkEnv
prepareEnv
makeSwap # smallest (512MB) droplet needs extra memory!
setupConf
infect
removeSwap
if [[ -z "${NO_REBOOT+x}" ]]; then
reboot
fi
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