asterisk: add update script

(cherry picked from commit ab3980e73a318c4cdc66001de97073daa8c2aec0)

pkgs/servers/asterisk/update.py

@@ -0,0 +1,36 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i python3 -p python39 python39.pkgs.packaging python39.pkgs.beautifulsoup4 python39.pkgs.requests
+from packaging import version
+from bs4 import BeautifulSoup
+import re, requests, json
+
+URL = "https://downloads.asterisk.org/pub/telephony/asterisk"
+
+page = requests.get(URL)
+changelog = re.compile("^ChangeLog-\d+\.\d+\.\d+$")
+changelogs = [a.get_text() for a in BeautifulSoup(page.text, 'html.parser').find_all('a') if changelog.match(a.get_text())]
+major_versions = {}
+for changelog in changelogs:
+    v = version.parse(changelog.removeprefix("ChangeLog-"))
+    major_versions.setdefault(v.major, []).append(v)
+
+out = {}
+for mv in major_versions.keys():
+    v = max(major_versions[mv])
+    sha = requests.get(f"{URL}/asterisk-{v}.sha256").text.split()[0]
+    out["asterisk_" + str(mv)] = {
+        "version": str(v),
+        "sha256": sha
+    }
+
+try:
+    with open("versions.json", "r") as in_file:
+        in_data = json.loads(in_file.read())
+        for v in in_data.keys():
+            print(v + ":", in_data[v]["version"], "->", out[v]["version"])
+except:
+    # nice to have for the PR, not a requirement
+    pass
+
+with open("versions.json", "w") as out_file:
+    out_file.write(json.dumps(out, sort_keys=True, indent=2))