1 files changed, 77 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/applications/networking/browsers/chromium/update.py b/nixpkgs/pkgs/applications/networking/browsers/chromium/update.py
new file mode 100755
index 00000000000..bfc7f0d2478
--- /dev/null
+++ b/nixpkgs/pkgs/applications/networking/browsers/chromium/update.py
@@ -0,0 +1,77 @@
+#! /usr/bin/env nix-shell
+#! nix-shell -i python -p python3 nix
+
+import csv
+import json
+import subprocess
+import sys
+
+from codecs import iterdecode
+from collections import OrderedDict
+from os.path import abspath, dirname
+from urllib.request import urlopen
+
+HISTORY_URL = 'https://omahaproxy.appspot.com/history?os=linux'
+DEB_URL = 'https://dl.google.com/linux/chrome/deb/pool/main/g'
+BUCKET_URL = 'https://commondatastorage.googleapis.com/chromium-browser-official'
+
+JSON_PATH = dirname(abspath(__file__)) + '/upstream-info.json'
+
+def load_json(path):
+    with open(path, 'r') as f:
+        return json.load(f)
+
+def nix_prefetch_url(url, algo='sha256'):
+    print(f'nix-prefetch-url {url}')
+    out = subprocess.check_output(['nix-prefetch-url', '--type', algo, url])
+    return out.decode('utf-8').rstrip()
+
+channels = {}
+last_channels = load_json(JSON_PATH)
+
+print(f'GET {HISTORY_URL}', file=sys.stderr)
+with urlopen(HISTORY_URL) as resp:
+    builds = csv.DictReader(iterdecode(resp, 'utf-8'))
+    for build in builds:
+        channel_name = build['channel']
+
+        # If we've already found a newer build for this channel, we're
+        # no longer interested in it.
+        if channel_name in channels:
+            continue
+
+        # If we're back at the last build we used, we don't need to
+        # keep going -- there's no new version available, and we can
+        # just reuse the info from last time.
+        if build['version'] == last_channels[channel_name]['version']:
+            channels[channel_name] = last_channels[channel_name]
+            continue
+
+        channel = {'version': build['version']}
+        suffix = 'unstable' if channel_name == 'dev' else channel_name
+
+        try:
+            channel['sha256'] = nix_prefetch_url(f'{BUCKET_URL}/chromium-{build["version"]}.tar.xz')
+            channel['sha256bin64'] = nix_prefetch_url(f'{DEB_URL}/google-chrome-{suffix}/google-chrome-{suffix}_{build["version"]}-1_amd64.deb')
+        except subprocess.CalledProcessError:
+            # This build isn't actually available yet.  Continue to
+            # the next one.
+            continue
+
+        channels[channel_name] = channel
+
+with open(JSON_PATH, 'w') as out:
+    def get_channel_key(item):
+        channel_name = item[0]
+        if channel_name == 'stable':
+            return 0
+        elif channel_name == 'beta':
+            return 1
+        elif channel_name == 'dev':
+            return 2
+        else:
+            print(f'Error: Unexpected channel: {channel_name}', file=sys.stderr)
+            sys.exit(1)
+    sorted_channels = OrderedDict(sorted(channels.items(), key=get_channel_key))
+    json.dump(sorted_channels, out, indent=2)
+    out.write('\n')