path: root/nixops/scripts/setup

#!/bin/bash

set -euo pipefail

RemoteRepo="gitolite@git.immae.eu:perso/Immae/Prive/Password_store/Sites"
DeploymentUuid="cef694f3-081d-11e9-b31f-0242ec186adf"

if ! which nix 2>/dev/null >/dev/null; then
  cat <<-EOF
	nix is needed, please install it:
	> curl https://nixos.org/nix/install | sh
	(or any other way handled by your distribution)
	EOF
  exit 1
fi

if [ "${NIX_STORE:-/nix/store}" != "/nix/store" ]; then
  cat <<-EOF
	Nix store outside of /nix/store is not supported
	EOF
  exit 1
fi

if [ -z "$NIXOPS_CONFIG_PASS_SUBTREE_REMOTE" \
    -o -z "$NIXOPS_CONFIG_PASS_SUBTREE_PATH" ]; then
  cat <<-EOF
	Two environment variables are needed to setup the password store:
	NIXOPS_CONFIG_PASS_SUBTREE_PATH : path where the subtree will be imported
	NIXOPS_CONFIG_PASS_SUBTREE_REMOTE : remote name to give to the repository
	EOF
  exit 1
fi

if ! pass $NIXOPS_CONFIG_PASS_SUBTREE_PATH > /dev/null 2>/dev/null; then
  cat <<-EOF
	/!\ This will modify your password store to add and import a subtree
	with the specific passwords files. Choose a path that doesn’t exist
	yet in your password store.
	> pass git remote add $NIXOPS_CONFIG_PASS_SUBTREE_REMOTE $RemoteRepo
	> pass git subtree add --prefix=$NIXOPS_CONFIG_PASS_SUBTREE_PATH $NIXOPS_CONFIG_PASS_SUBTREE_REMOTE master
	Later, you can use pull_environment and push_environment scripts to
	update the passwords when needed
	Continue? [y/N]
	EOF
  read y
  if [ "$y" = "y" -o "$y" = "Y" ]; then
    pass git remote add $NIXOPS_CONFIG_PASS_SUBTREE_REMOTE $RemoteRepo
    pass git subtree add --prefix=$NIXOPS_CONFIG_PASS_SUBTREE_PATH $NIXOPS_CONFIG_PASS_SUBTREE_REMOTE master
  else
    echo "Aborting"
    exit 1
  fi
fi

# Repull it before using it, just in case
pass git subtree pull --prefix=$NIXOPS_CONFIG_PASS_SUBTREE_PATH $NIXOPS_CONFIG_PASS_SUBTREE_REMOTE master

gpg_keys=$(pass ls $NIXOPS_CONFIG_PASS_SUBTREE_PATH/Nixops/GPGKeys | sed -e "1d" | cut -d" " -f2)
for key in $gpg_keys; do
  content=$(pass show $NIXOPS_CONFIG_PASS_SUBTREE_PATH/Nixops/GPGKeys/$key)
  fpr=$(echo "$content" | gpg --import-options show-only --import --with-colons | grep -e "^pub" | cut -d':' -f5)
  gpg --list-key "$fpr" >/dev/null 2>/dev/null && imported=yes || imported=no
  # /usr/share/doc/gnupg/DETAILS field 2
  (echo "$content" | gpg --import-options show-only --import --with-colons |
      grep -E '^pub:' |
      cut -d':' -f2 |
      grep -q '[fu]') && signed=yes || signed=no
  if [ "$signed" = no -o "$imported" = no ] ; then
    echo "The key for $key needs to be imported and signed (a local signature is enough)"
    echo "$content" | gpg --import-options show-only --import
    echo "Continue? [y/N]"
    read y
    if [ "$y" = "y" -o "$y" = "Y" ]; then
      echo "$content" | gpg --import
      gpg --expert --edit-key "$fpr" lsign quit
    else
      echo "Aborting"
      exit 1
    fi
  fi
done

nix_group=$(stat -c %G /nix/store)
if [ "$nix_group" = "nixbld" ]; then
  nix_user="nixbld1"
else
  nix_user="$(stat -c %U /nix/store)"
fi

if [ ! -f /etc/ssh/ssh_rsa_key_nixops ]; then
  cat <<-EOF
	The key to access private git repositories (websites hosted by the
	server) needs to be accessible to nix builders. It will be put in
	/etc/ssh/ssh_rsa_key_nixops (sudo right is needed for that)
	> pass show $NIXOPS_CONFIG_PASS_SUBTREE_PATH/Nixops/SshKey | sudo tee /etc/ssh/ssh_rsa_key_nixops > /dev/null
	> pass show $NIXOPS_CONFIG_PASS_SUBTREE_PATH/Nixops/SshKey.pub | sudo tee /etc/ssh/ssh_rsa_key_nixops.pub > /dev/null
	> sudo chmod u=r,go-rwx /etc/ssh/ssh_rsa_key_nixops
	> sudo chown $nix_user:$nix_group /etc/ssh/ssh_rsa_key_nixops /etc/ssh/ssh_rsa_key_nixops.pub
	Continue? [y/N]
	EOF
  read y
  if [ "$y" = "y" -o "$y" = "Y" ]; then
    if ! id -u $nix_user 2>/dev/null >/dev/null; then
      echo "User $nix_user seems inexistant, did you install nix?"
      exit 1
    fi
    mask=$(umask)
    umask 0777
    # Don’t forward it directly to tee, it would break ncurse pinentry
    key=$(pass show $NIXOPS_CONFIG_PASS_SUBTREE_PATH/Nixops/SshKey)
    echo "$key" | sudo tee /etc/ssh/ssh_rsa_key_nixops > /dev/null
    sudo chmod u=r,go=- /etc/ssh/ssh_rsa_key_nixops
    pubkey=$(pass show $NIXOPS_CONFIG_PASS_SUBTREE_PATH/Nixops/SshKey.pub)
    echo "$pubkey" | sudo tee /etc/ssh/ssh_rsa_key_nixops.pub > /dev/null
    sudo chmod a=r /etc/ssh/ssh_rsa_key_nixops.pub
    sudo chown $nix_user:$nix_group /etc/ssh/ssh_rsa_key_nixops /etc/ssh/ssh_rsa_key_nixops.pub
    umask $mask
  else
    echo "Aborting"
    exit 1
  fi
fi

if nix show-config --json | jq -e '.sandbox.value == "true"' >/dev/null; then
  cat <<-EOF
	There are some impure derivations in the repo currently (grep __noChroot), please put
	  sandbox = "relaxed"
	in /etc/nix/nix.conf
	you may also want to add
	  keep-outputs = true
	  keep-derivations = true
	to prevent garbage collector from deleting build dependencies (they take a lot of time to build)
	EOF
  exit 1
fi

DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
source $(dirname $(dirname $DIR))/nix_path_env
nixops="$(nix-build --no-out-link "$(dirname $DIR)/custom_nixops.nix")/bin/nixops"
export NIXOPS_STATE="$(dirname $DIR)/state/eldiron.nixops"
export NIXOPS_DEPLOYMENT="$DeploymentUuid"

if ! $nixops info 2>/dev/null >/dev/null; then
  cat <<-EOF
	Importing deployment file into nixops:
	Continue? [y/N]
	EOF
  read y
  if [ "$y" = "y" -o "$y" = "Y" ]; then
    deployment=$(pass show $NIXOPS_CONFIG_PASS_SUBTREE_PATH/Nixops/Deployment)
    echo "$deployment" | $nixops import

    $nixops modify "$(dirname $DIR)/eldiron.nix"
  else
    echo "Aborting"
    exit 1
  fi
fi

cat <<-EOF
	All set up.
	Please make sure you’re using scripts/nixops_wrap when deploying
	EOF