Read virtual packages from deb/RPM repositories

These virtual packages are supported by the rosdep tool, so should be
acceptable for use here as well.

ros_buildfarm/debian_repo.py

@@ -54,4 +54,17 @@ def get_debian_repo_index(debian_repository_baseurl, target, cache_dir):
 
         package_versions[debian_pkg_name] = PlatformPackageDescriptor(version, source_name)
 
+        prefix = 'Provides: '
+        provides = [line[len(prefix):] for line in lines if line.startswith(prefix)]
+        provides = [provide.strip() for line in provides for provide in line.split(',')]
+
+        for provide in provides:
+            provide_version = None
+            if ' ' in provide:
+                provide, provide_spec = provide.split(' ', 1)
+                if provide_spec.startswith('(=') and provide_spec.endswith(')'):
+                    provide_version = provide_spec[2:-1].strip()
+
+            package_versions[provide] = PlatformPackageDescriptor(provide_version, source_name)
+
     return package_versions

ros_buildfarm/rpm_repo.py

@@ -66,6 +66,18 @@ def get_rpm_repo_index(rpm_repository_baseurl, target, cache_dir):
             pkg_source_name = None
         package_versions[pkg_name] = PlatformPackageDescriptor(
             pkg_version + '-' + pkg_release, pkg_source_name)
+        pkg_provides = pkg_format.getElementsByTagName('rpm:provides')
+        for provide in pkg_provides:
+            for entry in provide.getElementsByTagName('rpm:entry'):
+                entry_name = entry.getAttribute('name')
+                if entry.getAttribute('flags') == 'EQ':
+                    entry_version = entry.getAttribute('ver')
+                    entry_release = entry.getAttribute('rel')
+                    desc_version = entry_version + '-' + entry_release
+                else:
+                    desc_version = None
+                package_versions[entry_name] = PlatformPackageDescriptor(
+                    desc_version, pkg_source_name)
 
     return package_versions
 

test/mock_rpm_index/9/x86_64/repodata/repomd.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<repomd xmlns="http://linux.duke.edu/metadata/repo" xmlns:rpm="http://linux.duke.edu/metadata/rpm">
+  <revision>0</revision>
+  <data type="primary">
+    <location href="repodata/primary.xml.gz"/>
+  </data>
+</repomd>

test/test_repo.py

@@ -0,0 +1,44 @@
+# Copyright 2024 Open Source Robotics Foundation, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import os
+
+import pytest
+
+from ros_buildfarm.common import PlatformPackageDescriptor
+from ros_buildfarm.common import Target
+from ros_buildfarm.package_repo import get_package_repo_data
+
+mock_deb_index_path = os.path.join(os.path.dirname(__file__), 'mock_deb_index')
+mock_rpm_index_path = os.path.join(os.path.dirname(__file__), 'mock_rpm_index')
+
+
+@pytest.mark.parametrize('target,mock_index_path', [
+    (Target('rhel', '9', 'x86_64'), mock_rpm_index_path),
+    (Target('ubuntu', 'noble', 'amd64'), mock_deb_index_path),
+])
+def test_get_repo_data(tmpdir, target, mock_index_path):
+    mock_index_url = 'file://' + mock_index_path
+    data = get_package_repo_data(mock_index_url, (target,), str(tmpdir))
+
+    assert target in data
+    target_data = data[target]
+
+    expected = PlatformPackageDescriptor('1.2.3-1', 'pkg-with-prov')
+    assert expected == target_data.get('pkg-with-prov')
+    assert expected == target_data.get('pkg-with-prov-a')
+    assert expected == target_data.get('pkg-with-prov-b')
+
+    expected = PlatformPackageDescriptor(None, 'pkg-with-prov')
+    assert expected == target_data.get('pkg-with-prov-no-ver')