git.scottworley.com Git - syncthing-autoregister/blob - pkgs/syncthing-set-id.nix

   1 { coreutils, jq, nix, nixfmt, syncthing, writeShellScriptBin, }:
   2 writeShellScriptBin "syncthing-set-id" ''
   3   set -euo pipefail
   4
   5   PATH="${coreutils}/bin"
   6
   7   usage() {
   8     cat <<< '
   9   usage: syncthing-set-device-id file [name] [id]
  10   example: syncthing-set-device-id /etc/nixos/modules/syncthing-devices.nix
  11   example: syncthing-set-device-id /etc/nixos/modules/syncthing-devices.nix lappy
  12   example: syncthing-set-device-id /etc/nixos/modules/syncthing-devices.nix lappy 1234567-89ABCDE-FGHIJKL-MNOPQRS-TUVWXYZ-0123456-789ABCD-EFGHIJK
  13
  14   If `name` is not specified, $HOSTNAME is used.
  15   If `id` is not specified, the ID of the current system instance is used.
  16   ' >&2
  17     exit 1
  18   }
  19
  20   [[ $# -lt 1 || "$1" == --help ]] && usage
  21   file=$(realpath "$1")
  22   name=''${2:-"$HOSTNAME"}
  23   if (( $# < 3));then
  24     configDir=$(${nix}/bin/nix --experimental-features nix-command eval --impure --raw --expr '(import <nixos/nixos> {}).config.services.syncthing.configDir')
  25     id=$(${syncthing}/bin/syncthing -home="$configDir" -device-id)
  26   else
  27     id=$3
  28   fi
  29
  30   if [[ ! -e "$file" ]];then
  31     echo "Creating $file" >&2
  32     echo '{}' > "$file"
  33   fi
  34
  35   tmp=$(mktemp "$(dirname "$file")/.$(basename "$file").XXXXXXXXXX")
  36
  37   # Use `nix-instantiate --eval -E --json | jq -r` instead of `nix eval --raw` until
  38   # https://github.com/NixOS/nix/issues/2678 is fixed.
  39   ${nix}/bin/nix-instantiate --eval -E --json \
  40       --argstr file "$file" \
  41       --argstr name "$name" \
  42       --argstr id   "$id" \
  43     '
  44       { file, name, id }:
  45       let pkgs = import <nixpkgs> { };
  46       in pkgs.lib.generators.toPretty { } (pkgs.lib.recursiveUpdate (import file) {
  47         services.syncthing.devices."''${name}".id = id;
  48       })
  49     ' | ${jq}/bin/jq -r | ${nixfmt}/bin/nixfmt > "$tmp"
  50
  51   mv "$tmp" "$file"
  52 ''