Add chrome_update.py.

* bin/chrome_update.py: New file.

bin/chrome_update.py

@@ -0,0 +1,106 @@
+#! /usr/bin/env -S guix shell python python-wrapper python-requests python-feedparser -- python
+
+# Usage: ./chrome_update.py
+# Most of this script is based on the update.py script from Nixpkgs:
+# https://github.com/NixOS/nixpkgs/blob/master/pkgs/applications/networking/browsers/chromium/update.py
+
+import json
+import re
+import subprocess
+import textwrap
+
+from collections import OrderedDict
+from urllib.request import urlopen
+
+import feedparser
+import requests
+
+RELEASES_URL = 'https://versionhistory.googleapis.com/v1/chrome/platforms/linux/channels/all/versions/all/releases'
+DEB_URL = 'https://dl.google.com/linux/chrome/deb/pool/main/g'
+HTML_TAGS = re.compile(r'<[^>]+>')
+
+def guix_download(url):
+    """Prefetches the content of the given URL and returns its hash."""
+    out = subprocess.check_output(['guix', 'download', url], stderr=subprocess.DEVNULL).decode().splitlines()[-1]
+    return out
+
+
+def get_package_version(package):
+    out = subprocess.check_output(['bash', '-c', f"guix show {package} | guix shell recutils -- recsel -p version"], stderr=subprocess.DEVNULL).decode().splitlines()[-1]
+    return out.replace("version: ", "")
+
+
+def print_cves(target_version):
+    feed = feedparser.parse('https://chromereleases.googleblog.com/feeds/posts/default')
+
+    for entry in feed.entries:
+        url = requests.get(entry.link).url.split('?')[0]
+        if re.search(r'Stable Channel Update for Desktop', entry.title):
+            if target_version and entry.title == '':
+                # Workaround for a special case (Chrome Releases bug?):
+                if 'the-stable-channel-has-been-updated-to' not in url:
+                    continue
+        else:
+            continue
+        content = entry.content[0].value
+        content = HTML_TAGS.sub('', content)  # Remove any HTML tags
+        if re.search(r'Linux', content) is None:
+            continue
+        # print(url)  # For debugging purposes
+        version = re.search(r'\d+(\.\d+){3}', content).group(0)
+        if target_version:
+            if version != target_version:
+                continue
+
+        if fixes := re.search(r'This update includes .+ security fix(es)?\.', content):
+            fixes = fixes.group(0)
+            if zero_days := re.search(r'Google is aware( of reports)? th(e|at) .+ in the wild\.', content):
+                fixes += " " + zero_days.group(0)
+            print('\n' + '\n'.join(textwrap.wrap(fixes, width=72)))
+        if cve_list := re.findall(r'CVE-[^: ]+', content):
+            cve_list = list(OrderedDict.fromkeys(cve_list))  # Remove duplicates but preserve the order
+            cve_string = ', '.join(cve_list)
+            print("\nFixes " + '\n'.join(textwrap.wrap(cve_string, width=72)) + ".")
+        break
+
+
+with urlopen(RELEASES_URL) as resp:
+    releases = json.load(resp)['releases']
+
+    for release in releases:
+        if "endTime" in release["serving"]:
+            continue
+
+        channel_name = re.findall("chrome\/platforms\/linux\/channels\/(.*)\/versions\/", release['name'])[0]
+
+        channel = {'version': release['version']}
+        cves = ""
+        if channel_name == 'dev':
+            google_chrome_suffix = 'unstable'
+        elif channel_name == 'ungoogled-chromium':
+            google_chrome_suffix = 'stable'
+        else:
+            google_chrome_suffix = channel_name
+
+        channel['name'] = f"google-chrome-{google_chrome_suffix}"
+
+        try:
+            channel['hash'] = guix_download(
+                f'{DEB_URL}/{channel["name"]}/' +
+                f'{channel["name"]}_{release["version"]}-1_amd64.deb')
+        except subprocess.CalledProcessError:
+            # This release isn't actually available yet.  Continue to
+            # the next one.
+            continue
+
+        print(f"====================================== {channel['name']} ===================================")
+        print(f"Current version: {get_package_version(channel['name'])}")
+        print(f"Pulled version: {channel['version']}")
+        print(f"Hash: {channel['hash']}")
+        print("Commit message:\n\n")
+        print(f"nongnu: {channel['name']}: Update to {channel['version']}. ")
+        if channel_name == "stable":
+            print_cves(channel['version'])
+        print("")
+        print(f"* nongnu/packages/chrome.scm ({channel['name']}): Update to {channel['version']}.")
+        print("")