Brand Hydra OS image and add custom Fastfetch summary

tests/test_branding.py

@@ -0,0 +1,55 @@
+import shlex
+from pathlib import Path
+import tempfile
+import unittest
+
+from hydra import image
+
+
+class BrandingTests(unittest.TestCase):
+    def setUp(self):
+        self.tmp = tempfile.TemporaryDirectory()
+        self.addCleanup(self.tmp.cleanup)
+        self.root = Path(self.tmp.name) / 'rootfs'
+        self.root.mkdir()
+        version = '6.18.54-gentoo-dist-bin'
+        (self.root / 'lib/modules' / version).mkdir(parents=True)
+        (self.root / 'boot').mkdir()
+        (self.root / 'boot' / ('vmlinuz-' + version)).write_text('kernel')
+
+    def release(self):
+        return dict(line.split('=', 1)[0:1] + shlex.split(line.split('=', 1)[1])
+                    for line in (self.root / 'etc/os-release').read_text().splitlines()
+                    if line and not line.startswith('#'))
+
+    def test_export_brands_derivative_without_rewriting_packaged_gentoo_metadata(self):
+        vendor = self.root / 'usr/lib/os-release'
+        vendor.parent.mkdir(parents=True)
+        original = "NAME='Gentoo'\nID=gentoo\nPRETTY_NAME='Gentoo Linux'\nVERSION_ID=2.18\nHOME_URL='https://www.gentoo.org/'\n"
+        vendor.write_text(original)
+        (self.root / 'etc').mkdir()
+        (self.root / 'etc/os-release').symlink_to('../usr/lib/os-release')
+
+        image.configure_rootfs(self.root, Path(__file__).resolve().parents[1])
+
+        self.assertEqual(self.release(), {
+            'NAME': 'Hydra OS', 'PRETTY_NAME': 'Hydra OS', 'ID': 'hydra-os',
+            'ID_LIKE': 'gentoo', 'VERSION_ID': '2.18',
+            'HOME_URL': 'https://www.gentoo.org/',
+        })
+        self.assertFalse((self.root / 'etc/os-release').is_symlink())
+        self.assertEqual(vendor.read_text(), original)
+        self.assertEqual((self.root / 'etc/hostname').read_text(), 'hydra-os\n')
+
+    def test_export_can_brand_minimal_payload_without_os_release(self):
+        image.configure_rootfs(self.root, Path(__file__).resolve().parents[1])
+
+        self.assertTrue((self.root / 'etc/os-release').is_file())
+        self.assertEqual(self.release(), {
+            'NAME': 'Hydra OS', 'PRETTY_NAME': 'Hydra OS',
+            'ID': 'hydra-os', 'ID_LIKE': 'gentoo',
+        })
+
+
+if __name__ == '__main__':
+    unittest.main()