#!/bin/bash

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 [ -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

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 $NIXOPS_CONFIG_PASS_SUBTREE_PATH/Nixops/SshKey.pub | sudo tee /etc/ssh/ssh_rsa_key_nixops.pub > /dev/null
	> sudo chmod u=r,go-rwx /etc/ssh/ssh_rsa_key_nixops
	> sudo chown nixbld1:nixbld /etc/ssh/ssh_rsa_key_nixops /etc/ssh/ssh_rsa_key_nixops.pub
	Continue? [y/N]
	EOF
  read y
  if [ "$y" = "y" -o "$y" = "Y" ]; then
    if ! id -u nixbld1 2>/dev/null >/dev/null; then
      echo "User nixbld1 seems inexistant, did you install nix?"
      exit 1
    fi
    mask=$(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 nixbld1:nixbld /etc/ssh/ssh_rsa_key_nixops /etc/ssh/ssh_rsa_key_nixops.pub
    umask $mask
  else
    echo "Aborting"
    exit 1
  fi
fi

if ! which nixops 2>/dev/null >/dev/null; then
  cat <<-EOF
	nixops is needed:
	> nix-env -i nixops
	If it fails, please check that $HOME/.nix-profile/bin is in your PATH.
	Continue? [y/N]
	EOF
  read y
  if [ "$y" = "y" -o "$y" = "Y" ]; then
    nix-env -i nixops
    if ! which nixops 2>/dev/null >/dev/null; then
      echo "Installation failed, please check that $HOME/.nix-profile/bin is in your path."
      exit 1
    fi
  else
    echo "Aborting"
    exit 1
  fi
fi

DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
export NIXOPS_STATE="$(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