1 files changed, 122 insertions, 0 deletions
diff --git a/pkgs/os-specific/linux/kernel/update-zen.py b/pkgs/os-specific/linux/kernel/update-zen.py
new file mode 100755
index 00000000000..3c51f806d8f
--- /dev/null
+++ b/pkgs/os-specific/linux/kernel/update-zen.py
@@ -0,0 +1,122 @@
+#! /usr/bin/env nix-shell
+#! nix-shell -i python3 -p python3 nix nix-prefetch-git
+
+import fileinput
+import json
+import os
+import sys
+import re
+import subprocess
+
+from datetime import datetime
+from urllib.request import urlopen, Request
+
+
+def panic(exc):
+    raise Exception(exc)
+
+
+DIR = os.path.dirname(os.path.abspath(__file__))
+HEADERS = {'Accept': 'application/vnd.github.v3+json'}
+
+
+def github_api_request(endpoint):
+    base_url = 'https://api.github.com/'
+    request = Request(base_url + endpoint, headers=HEADERS)
+    with urlopen(request) as http_response:
+        return json.loads(http_response.read().decode('utf-8'))
+
+
+def get_commit_date(repo, sha):
+    url = f'https://api.github.com/repos/{repo}/commits/{sha}'
+    request = Request(url, headers=HEADERS)
+    with urlopen(request) as http_response:
+        commit = json.loads(http_response.read().decode())
+        date = commit['commit']['committer']['date'].rstrip('Z')
+        date = datetime.fromisoformat(date).date().isoformat()
+        return 'unstable-' + date
+
+
+def nix_prefetch_git(url, rev):
+    """Prefetches the requested Git revision (incl. submodules) of the given repository URL."""
+    print(f'nix-prefetch-git {url} {rev}')
+    out = subprocess.check_output([
+        'nix-prefetch-git', '--quiet',
+        '--url', url,
+        '--rev', rev,
+        '--fetch-submodules'])
+    return json.loads(out)['sha256']
+
+
+def nix_prefetch_url(url, unpack=False):
+    """Prefetches the content of the given URL."""
+    print(f'nix-prefetch-url {url}')
+    options = ['--type', 'sha256']
+    if unpack:
+        options += ['--unpack']
+    out = subprocess.check_output(['nix-prefetch-url'] + options + [url])
+    return out.decode('utf-8').rstrip()
+
+
+def update_file(relpath, variant, version, suffix, sha256):
+    file_path = os.path.join(DIR, relpath)
+    with fileinput.FileInput(file_path, inplace=True) as f:
+        for line in f:
+            result = line
+            result = re.sub(
+                fr'^    version = ".+"; #{variant}',
+                f'    version = "{version}"; #{variant}',
+                result)
+            result = re.sub(
+                fr'^    suffix = ".+"; #{variant}',
+                f'    suffix = "{suffix}"; #{variant}',
+                result)
+            result = re.sub(
+                fr'^    sha256 = ".+"; #{variant}',
+                f'    sha256 = "{sha256}"; #{variant}',
+                result)
+            print(result, end='')
+
+
+def read_file(relpath, variant):
+    file_path = os.path.join(DIR, relpath)
+    re_version = re.compile(fr'^\s*version = "(.+)"; #{variant}')
+    re_suffix = re.compile(fr'^\s*suffix = "(.+)"; #{variant}')
+    version = None
+    suffix = None
+    with fileinput.FileInput(file_path, mode='r') as f:
+        for line in f:
+            version_match = re_version.match(line)
+            if version_match:
+                version = version_match.group(1)
+                continue
+
+            suffix_match = re_suffix.match(line)
+            if suffix_match:
+                suffix = suffix_match.group(1)
+                continue
+
+            if version and suffix:
+                break
+    return version, suffix
+
+
+if __name__ == "__main__":
+    if len(sys.argv) == 1:
+        panic("Update variant expected")
+    variant = sys.argv[1]
+    if variant not in ("zen", "lqx"):
+        panic(f"Unexepected variant instead of 'zen' or 'lqx': {sys.argv[1]}")
+    pattern = re.compile(fr"v(\d+\.\d+\.?\d*)-({variant}\d+)")
+    zen_tags = github_api_request('repos/zen-kernel/zen-kernel/releases')
+    for tag in zen_tags:
+        zen_match = pattern.match(tag['tag_name'])
+        if zen_match:
+            zen_tag = zen_match.group(0)
+            zen_version = zen_match.group(1)
+            zen_suffix = zen_match.group(2)
+            break
+    old_version, old_suffix = read_file('zen-kernels.nix', variant)
+    if old_version != zen_version or old_suffix != zen_suffix:
+        zen_hash = nix_prefetch_git('https://github.com/zen-kernel/zen-kernel.git', zen_tag)
+        update_file('zen-kernels.nix', variant, zen_version, zen_suffix, zen_hash)