vivaldi: Add update script

pkgs/applications/networking/browsers/vivaldi/update.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p libarchive curl common-updater-scripts
+
+set -eu -o pipefail
+
+cd "$(dirname "${BASH_SOURCE[0]}")"
+root=../../../../..
+export NIXPKGS_ALLOW_UNFREE=1
+
+version() {
+	(cd "$root" && nix-instantiate --eval --strict -A "$1.version" | tr -d '"')
+}
+
+vivaldi_version_old=$(version vivaldi)
+vivaldi_version=$(curl -sS https://vivaldi.com/download/ | sed -rne 's/.*vivaldi-stable_([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+-[0-9]+)_amd64\.deb.*/\1/p')
+
+if [[ "$vivaldi_version" = "$vivaldi_version_old" ]]; then
+	echo "nothing to do, vivaldi $vivaldi_version is current"
+	exit
+fi
+
+# Download vivaldi and save hash and file path.
+url="https://downloads.vivaldi.com/stable/vivaldi-stable_${vivaldi_version}_amd64.deb"
+mapfile -t prefetch < <(nix-prefetch-url --print-path "$url")
+hash=${prefetch[0]}
+path=${prefetch[1]}
+
+echo "vivaldi: $vivaldi_version_old -> $vivaldi_version"
+(cd "$root" && update-source-version vivaldi "$vivaldi_version" "$hash")
+
+# Check vivaldi-ffmpeg-codecs version.
+chromium_version_old=$(version vivaldi-ffmpeg-codecs)
+chromium_version=$(bsdtar xOf "$path" data.tar.xz | bsdtar xOf - ./opt/vivaldi/vivaldi-bin | strings | grep -A2 -i '^chrome\/' | grep '^[0-9]\+\.[0-9]\+\.[1-9][0-9]\+\.[0-9]\+')
+
+if [[ "$chromium_version" != "$chromium_version_old" ]]; then
+	echo "vivaldi-ffmpeg-codecs: $chromium_version_old -> $chromium_version"
+	(cd "$root" && update-source-version vivaldi-ffmpeg-codecs "$chromium_version")
+fi