push sheeet

pkgs/build-support/dotnet/make-nuget-source/default.nix

@@ -0,0 +1,43 @@
+{
+  lib,
+  python3,
+  stdenvNoCC,
+}:
+
+{
+  name,
+  description ? "",
+  deps ? [ ],
+  ...
+}@args:
+
+stdenvNoCC.mkDerivation (
+  lib.recursiveUpdate
+    {
+      inherit name;
+
+      nativeBuildInputs = [ python3 ];
+
+      buildCommand = ''
+        mkdir -p $out/{lib,share}
+
+        # use -L to follow symbolic links. When `projectReferences` is used in
+        # buildDotnetModule, one of the deps will be a symlink farm.
+        find -L ${lib.concatStringsSep " " deps} -type f -name '*.nupkg' -exec \
+          ln -s '{}' -t $out/lib ';'
+
+        # Generates a list of all licenses' spdx ids, if available.
+        # Note that this currently ignores any license provided in plain text (e.g. "LICENSE.txt")
+        python ${./extract-licenses-from-nupkgs.py} $out/lib > $out/share/licenses
+      '';
+
+      meta.description = description;
+    }
+    (
+      removeAttrs args [
+        "name"
+        "description"
+        "deps"
+      ]
+    )
+)

pkgs/build-support/dotnet/make-nuget-source/extract-licenses-from-nupkgs.py

@@ -0,0 +1,30 @@
+#!/usr/bin/env python3
+"""
+Opens each .nupkg file in a directory, and extracts the SPDX license identifiers
+from them if they exist. The SPDX license identifier is stored in the
+'<license type="expression">...</license>' tag in the .nuspec file.
+All found license identifiers will be printed to stdout.
+"""
+
+from glob import glob
+from pathlib import Path
+import sys
+import xml.etree.ElementTree as ET
+import zipfile
+
+all_licenses = set()
+
+if len(sys.argv) < 2:
+    print(f"Usage: {sys.argv[0]} DIRECTORY")
+    sys.exit(1)
+
+nupkg_dir = Path(sys.argv[1])
+for nupkg_name in glob("*.nupkg", root_dir=nupkg_dir):
+    with zipfile.ZipFile(nupkg_dir / nupkg_name) as nupkg:
+        for nuspec_name in [name for name in nupkg.namelist() if name.endswith(".nuspec")]:
+            with nupkg.open(nuspec_name) as nuspec_stream:
+                nuspec = ET.parse(nuspec_stream)
+                licenses = nuspec.findall(".//{*}license[@type='expression']")
+                all_licenses.update([license.text for license in licenses])
+
+print("\n".join(sorted(all_licenses)))