jlink: Add automatic updater

externals/packages/jlink/default.nix

@@ -19,32 +19,14 @@
 , libXrandr
 }:
 let
-  jlinkVersion = "756a";
+  conf = (lib.importJSON ./version.json).${stdenv.hostPlatform.system} or (throw "unsupported system ${stdenv.hostPlatform.system}");
-
-  architecture = {
-    x86_64-linux = "x86_64";
-    i686-linux = "i386";
-    armv7l-linux = "arm";
-    aarch64-linux = "arm64";
-  }.${stdenv.hostPlatform.system} or (throw "unsupported system ${stdenv.hostPlatform.system}");
-
-  sha256 = {
-    x86_64-linux = "1bg038042byrfn575n3add9l83i1clbav7fzm7ga7svfd06k4lny";
-    i686-linux = "0a1prsb91rhpy55qklmnh3r1ac6325yvk3gjwhy0dcl34fd0wjqf";
-    armv7l-linux = "1vvxsfizvdsgqv0f71nxqj5kmj9glx09z1jsrqq8h3ld95f92xmp";
-    aarch64-linux = "0gw50jnd92g1p4391qiyvcwmn76akc3f1f5arkax6dqcwim443gg";
-  }.${stdenv.hostPlatform.system} or (throw "unsupported system ${stdenv.hostPlatform.system}");
-
-  url = "https://www.segger.com/downloads/jlink/JLink_Linux_V${jlinkVersion}_${architecture}.tgz";
 in
 stdenv.mkDerivation rec {
   pname = "jlink";
-  version = jlinkVersion;
+  version = conf.version;
 
   src = fetchurl {
-    url = url;
+    inherit (conf) url sha256 curlOpts;
-    sha256 = sha256;
-    curlOpts = "-d accept_license_agreement=accepted -d non_emb_ctr=confirmed";
   };
 
   dontConfigure = true;
@@ -83,6 +65,8 @@ stdenv.mkDerivation rec {
     patchelf --add-needed libudev.so.1 $out/JLink/libjlinkarm.so
   '';
 
+  passthru.updateScript = ./update.py;
+
   meta = with lib; {
     homepage = "https://www.segger.com/downloads/jlink";
     description = "SEGGER J-Link";

externals/packages/jlink/update.py

@@ -0,0 +1,43 @@
+#!/usr/bin/env nix-shell
+#! nix-shell -i python3 -p "python3.withPackages (ps: with ps; [ beautifulsoup4 requests ] )" nix-prefetch
+import requests
+import bs4
+import json
+import subprocess
+import os
+
+
+BASE_DIR = os.path.dirname(os.path.abspath(__file__))
+URL_FORMAT = 'https://www.segger.com/downloads/jlink/JLink_Linux_V{version}_{arch}.tgz'
+CURL_OPTS = '-d accept_license_agreement=accepted -d submit=Download+software'
+
+page = requests.get('https://www.segger.com/downloads/jlink').text
+elem = bs4.BeautifulSoup(page, features='lxml').find(
+    'select', {'class': 'version'}).find('option')
+version = elem.children.__next__().lstrip('V')
+
+
+arches = [
+    ('x86_64-linux', 'x86_64'),
+    ('i686-linux', 'i686'),
+    ('armv7l-linux', 'arm'),
+    ('aarch64-linux', 'arm64')
+]
+
+
+out_obj = {}
+for nix_arch, jlink_arch in arches:
+    url = URL_FORMAT.format(version=version.replace('.', ''), arch=jlink_arch)
+    out = subprocess.run(
+        ['nix-prefetch', f'{{fetchurl}}: fetchurl {{ url = "{url}"; curlOpts = "{CURL_OPTS}"; }}'], stdout=subprocess.PIPE, check=True)
+    sha256 = out.stdout.decode('utf8').strip()
+    out_obj[nix_arch] = {
+        'url': url,
+        'version': version,
+        'curlOpts': CURL_OPTS,
+        'sha256': sha256
+    }
+
+out_file = open(os.path.join(BASE_DIR, 'version.json'), 'w')
+json.dump(out_obj, out_file)
+out_file.close()

externals/packages/jlink/version.json

@@ -0,0 +1 @@
+{"x86_64-linux": {"url": "https://www.segger.com/downloads/jlink/JLink_Linux_V758b_x86_64.tgz", "version": "7.58b", "curlOpts": "-d accept_license_agreement=accepted -d submit=Download+software", "sha256": "sha256-kr1zCzvGx4pmhPeWEoXlouOMnZY69V59/cF8hakv7ps="}, "i686-linux": {"url": "https://www.segger.com/downloads/jlink/JLink_Linux_V758b_i686.tgz", "version": "7.58b", "curlOpts": "-d accept_license_agreement=accepted -d submit=Download+software", "sha256": "sha256-d8gVsn3hYU39m15Tu5VkqOnocPTXyuCKmvLZsRw6fNw="}, "armv7l-linux": {"url": "https://www.segger.com/downloads/jlink/JLink_Linux_V758b_arm.tgz", "version": "7.58b", "curlOpts": "-d accept_license_agreement=accepted -d submit=Download+software", "sha256": "sha256-ze5EEjboQuT4UVxw/rU3w4Pgsk5yHoLARURQxonl26w="}, "aarch64-linux": {"url": "https://www.segger.com/downloads/jlink/JLink_Linux_V758b_arm64.tgz", "version": "7.58b", "curlOpts": "-d accept_license_agreement=accepted -d submit=Download+software", "sha256": "sha256-NFzo2udZ2ZuHdwG4ZGftI139LZPIrdso5adiMG09uh0="}}