spotify: add macOS support to update script

pkgs/by-name/sp/spotify/update.sh

@@ -1,5 +1,6 @@
 #!/usr/bin/env nix-shell
-#! nix-shell -i bash -p curl jq git gnused gnugrep
+#! nix-shell -i bash -p common-updater-scripts curl jq git gnused gnugrep libplist undmg
+set -euo pipefail
 
 
 # executing this script without arguments will
@@ -20,11 +21,11 @@
 
 channel="${1:-stable}" # stable/candidate/edge
 nixpkgs="$(git rev-parse --show-toplevel)"
-spotify_nix="$nixpkgs/pkgs/by-name/sp/spotify/linux.nix"
-
 
+update_linux() {
+  nix_file="$nixpkgs/pkgs/by-name/sp/spotify/linux.nix"
   #
-# find the newest stable spotify version avaiable on snapcraft
+  # find the newest stable spotify version available on snapcraft
   #
 
   # create bash array from snap info
@@ -43,46 +44,73 @@ revision="${snap_info[0]}"
   hash="$(nix-hash --to-sri --type sha512 ${snap_info[1]} | sed 's|/|\\/|g')"
   upstream_version="${snap_info[2]}"
   last_updated="${snap_info[3]}"
-echo "Latest $channel release is $upstream_version from $last_updated."
+  echo "Latest $channel release for Spotify on Linux is $upstream_version from $last_updated."
   #
   # read the current spotify version from the currently *committed* nix expression
   #
 
   current_nix_version=$(
-  grep 'version\s*=' "$spotify_nix" \
+    grep 'version\s*=' "$nix_file" \
     | sed -Ene 's/.*"(.*)".*/\1/p'
   )
 
-echo "Current nix version: $current_nix_version"
+  echo "Current Spotify for Linux version in Nixpkgs: $current_nix_version"
 
   #
   # update the nix expression if the versions differ
   #
 
   if [[ "$current_nix_version" = "$upstream_version" ]]; then
-  echo "Spotify is already up-to-date"
-  exit 0
+    echo "Spotify on Linux is already up-to-date"
+    return
   fi
 
-echo "Updating from ${current_nix_version} to ${upstream_version}, released on ${last_updated}"
+  echo "Updating Spotify on Linux from ${current_nix_version} to ${upstream_version}, released on ${last_updated}"
 
   # search-and-replace revision, hash and version
   sed --regexp-extended \
     -e 's/rev\s*=\s*"[0-9]+"\s*;/rev = "'"${revision}"'";/' \
     -e 's/hash\s*=\s*"[^"]*"\s*;/hash = "'"${hash}"'";/' \
     -e 's/version\s*=\s*".*"\s*;/version = "'"${upstream_version}"'";/' \
-  -i "$spotify_nix"
+    -i "$nix_file"
+}
 
-#
-# try to build the updated version
-#
+update_macos() {
+  nix_file="$nixpkgs/pkgs/by-name/sp/spotify/darwin.nix"
 
-export NIXPKGS_ALLOW_UNFREE=1
-if ! nix-build -A spotify "$nixpkgs"; then
-  echo "The updated spotify failed to build."
-  exit 1
+  tmp_dir=$(mktemp -d)
+  trap 'rm -rf "$tmp_dir"' EXIT
+
+  pushd $tmp_dir
+
+  x86_64_url="https://download.scdn.co/Spotify.dmg"
+  aarch64_url="https://download.scdn.co/SpotifyARM64.dmg"
+
+  curl -OL $aarch64_url
+  undmg SpotifyARM64.dmg
+  upstream_version=$(plistutil -i Spotify.app/Contents/Info.plist -f json -o - | jq -r '.CFBundleVersion')
+
+  popd
+
+  current_nix_version=$(
+    grep 'version\s*=' "$nix_file" \
+    | sed -Ene 's/.*"(.*)".*/\1/p'
+  )
+
+  if [[ "$current_nix_version" != "$upstream_version" ]]; then
+    archive_url="https://web.archive.org/save"
+    archived_x86_64_url=$(curl -s -I -L -o /dev/null "$archive_url/$x86_64_url" -w '%{url_effective}')
+    archived_aarch64_url=$(curl -s -I -L -o /dev/null "$archive_url/$aarch64_url" -w '%{url_effective}')
+
+    update-source-version "pkgsCross.x86_64-darwin.spotify" "$upstream_version" "" "$archived_x86_64_url" \
+      --file=$nix_file \
+      --ignore-same-version
+
+    update-source-version "pkgsCross.aarch64-darwin.spotify" "$upstream_version" "" "$archived_aarch64_url" \
+      --file=$nix_file \
+      --ignore-same-version
   fi
+}
 
-# Commit changes
-git add "$spotify_nix"
-git commit -m "spotify: ${current_nix_version} -> ${upstream_version}"
+update_linux
+update_macos