Use standard apk PURL type for Alpine packages

CHANGELOG.rst

@@ -4,6 +4,11 @@ Changelog
 Next release
 --------------
 
+- Use the standard ``apk`` Package URL type for Alpine packages, their
+  dependencies, and source packages. Match Alpine package file references with
+  resource paths on Windows.
+  https://github.com/aboutcode-org/scancode-toolkit/issues/4964
+
 - Fix the optional ``licenses`` extra dependency typo to install
   ``licensedcode-data``.
   https://github.com/aboutcode-org/scancode-toolkit/pull/5056

src/packagedcode/alpine.py

@@ -15,7 +15,6 @@
 from functools import partial
 from datetime import datetime
 from os import path
-from pathlib import Path
 
 import attr
 from license_expression import LicenseSymbolLike
@@ -37,7 +36,7 @@ class AlpineApkArchiveHandler(models.DatafileHandler):
     datasource_id = 'alpine_apk_archive'
     path_patterns = ('*.apk',)
     filetypes = ('gzip compressed data',)
-    default_package_type = 'alpine'
+    default_package_type = 'apk'
     description = 'Alpine Linux .apk package archive'
     documentation_url = 'https://wiki.alpinelinux.org/wiki/Alpine_package_format'
 
@@ -61,7 +60,7 @@ class AlpineInstalledDatabaseHandler(models.DatafileHandler):
     datasource_id = 'alpine_installed_db'
     datasource_type = 'sys'
     path_patterns = ('*lib/apk/db/installed',)
-    default_package_type = 'alpine'
+    default_package_type = 'apk'
     description = 'Alpine Linux installed package database'
 
     @classmethod
@@ -91,10 +90,9 @@ def assemble(cls, package_data, resource, codebase, package_adder):
 
         cls.populate_license_fields(package)
 
-        root_path = Path(root_resource.path)
         # a file ref extends from the root of the filesystem
         file_references_by_path = {
-            str(root_path / ref.path): ref
+            posixpath.join(root_resource.path, ref.path): ref
             for ref in package.file_references
         }
 
@@ -132,7 +130,7 @@ def assemble(cls, package_data, resource, codebase, package_adder):
 class AlpineApkbuildHandler(models.DatafileHandler):
     datasource_id = 'alpine_apkbuild'
     path_patterns = ('*APKBUILD',)
-    default_package_type = 'alpine'
+    default_package_type = 'apk'
     description = 'Alpine Linux APKBUILD package script'
     documentation_url = 'https://wiki.alpinelinux.org/wiki/APKBUILD_Reference'
 
@@ -1033,7 +1031,7 @@ def D_dependencies_handler(value, dependencies=None, **kwargs):
 
             requirement = operator + ver
 
-        purl = PackageURL(type='alpine', name=name, version=version).to_string()
+        purl = PackageURL(type='apk', name=name, version=version).to_string()
 
         # that the only scope we have for now
         scope = 'depend'
@@ -1057,7 +1055,7 @@ def o_source_package_handler(value, version=None, **kwargs):
     Return a source_packages list of Package URLs
     """
     # the version value will be that of the current package
-    origin = PackageURL(type='alpine', name=value, version=version).to_string()
+    origin = PackageURL(type='apk', name=value, version=version).to_string()
     return {'source_packages': [origin]}