package/python-libyang: new package

Python CFFI bindings for the libyang YANG library, providing the
'libyang' Python module for YANG data modeling operations.

This package is used by higher-level tooling such as python-sysrepo.

https://github.com/CESNET/libyang-python
Signed-off-by: Vincent Jardin <vjardin@free.fr>
Signed-off-by: Vincent Cruz <mooz@blockos.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

support/testing/tests/package/sample_python_libyang.py

@@ -0,0 +1,46 @@
+# test from https://github.com/CESNET/libyang-python/blob/master/README.rst
+
+import libyang
+from xml.etree import ElementTree
+
+ctx = libyang.Context()
+
+module = ctx.parse_module_str('''
+module example {
+  namespace "urn:example";
+  prefix "ex";
+  container data {
+    list interface {
+      key name;
+      leaf name {
+        type string;
+      }
+      leaf address {
+        type string;
+      }
+    }
+    leaf hostname {
+      type string;
+    }
+  }
+}
+''')
+
+node = module.parse_data_dict({
+    'data': {
+        'hostname': 'foobar',
+        'interface': [
+            {'name': 'eth0', 'address': '1.2.3.4/24'},
+            {'name': 'lo', 'address': '127.0.0.1'},
+        ],
+    },
+})
+
+xml = node.print_mem('xml', pretty=True)
+tree = ElementTree.fromstringlist(xml)
+assert tree.tag == '{urn:example}data'
+assert tree.find('.//{*}hostname').text == 'foobar'
+assert len(tree.find('.//{*}interface')) == 2
+
+node.free()
+ctx.destroy()

support/testing/tests/package/test_python_libyang.py

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+from tests.package.test_python import TestPythonPackageBase
+
+
+class TestPythonLibyang(TestPythonPackageBase):
+    __test__ = True
+    config = TestPythonPackageBase.config + \
+        """
+        BR2_PACKAGE_PYTHON3=y
+        BR2_PACKAGE_PYTHON3_PYEXPAT=y
+        BR2_PACKAGE_PYTHON_LIBYANG=y
+        """
+    sample_scripts = ["tests/package/sample_python_libyang.py"]