mount: Switch to using pycdio instead of pycdlib

Also add a root only test for IsoMountpoint.

(cherry picked from commit c4aba2e47f)

lorax.spec

@@ -51,7 +51,7 @@ Requires:       python3-mako
 Requires:       python3-kickstart >= 3.19
 Requires:       python3-dnf >= 3.2.0
 Requires:       python3-librepo
-Requires:       python3-pycdlib
+Requires:       python3-pycdio
 
 %if 0%{?fedora}
 # Fedora specific deps

src/pylorax/mount.py

@@ -21,8 +21,7 @@ import logging
 log = logging.getLogger("livemedia-creator")
 
 import os
-import pycdlib
-from pycdlib.pycdlibexception import PyCdlibException
+import iso9660
 
 from pylorax.imgutils import mount, umount
 
@@ -92,13 +91,18 @@ class IsoMountpoint(object):
 
     def get_iso_label(self):
         """
-        Get the iso's label using pycdlib
+        Get the iso's label using pycdio
 
         Sets self.label if one is found
         """
         try:
-            iso = pycdlib.PyCdlib()
-            iso.open(self.iso_path)
-            self.label = iso.pvd.volume_identifier.decode("UTF-8").strip()
-        except PyCdlibException as e:
+            iso = iso9660.ISO9660.IFS(source=self.iso_path)
+            if not iso.is_open():
+                raise RuntimeError("error opening file")
+
+            self.label = iso.get_volume_id()
+            if self.label is None:
+                self.label = ""
+                raise RuntimeError("error reading volume id")
+        except RuntimeError as e:
             log.error("Problem reading label from %s: %s", self.iso_path, e)

test-packages

@@ -13,7 +13,7 @@ python3-magic
 python3-mako
 python3-pocketlint
 python3-psutil
-python3-pycdlib
+python3-pycdio
 python3-pylint
 python3-pytest
 python3-pytest-cov

tests/pylorax/test_mount.py

@@ -0,0 +1,38 @@
+import os
+import subprocess
+import tempfile
+import unittest
+
+from pylorax.mount import IsoMountpoint
+from pylorax.sysutils import joinpaths
+
+
+def mktestiso(rootdir, volid):
+    # Make some fake files
+    for f in ("/images/pxeboot/vmlinuz", "/images/pxeboot/initrd.img", "/LiveOS/squashfs.img"):
+        p = joinpaths(rootdir, "sysroot", f)
+        os.makedirs(os.path.dirname(p), exist_ok=True)
+        with open(p, "w") as ff:
+            ff.write("I AM FAKE FILE %s" % f.upper())
+
+    # Make an iso of the files
+    make_iso = ["xorrisofs", "-o", joinpaths(rootdir, "test.iso"),
+                "-R", "-J", "-V", volid,
+                "-graft-points", "/=%s" % joinpaths(rootdir, "sysroot")]
+    subprocess.check_call(make_iso)
+
+@unittest.skipUnless(os.geteuid() == 0 and not os.path.exists("/.in-container"), "requires root privileges, and no containers")
+class IsoMountpointTest(unittest.TestCase):
+    def test_volid(self):
+        with tempfile.TemporaryDirectory(prefix="lorax.test.") as work_dir:
+            mktestiso(work_dir, "Fedora-test-iso-x86_64")
+            self.assertTrue(os.path.exists(joinpaths(work_dir, "test.iso")))
+
+            iso = IsoMountpoint(joinpaths(work_dir, "test.iso"))
+            self.addCleanup(iso.umount)
+            self.assertEqual(iso.iso_path, joinpaths(work_dir, "test.iso"))
+            self.assertIsNotNone(iso.mount_dir)
+            self.assertTrue(iso.stage2)
+            self.assertTrue(iso.kernel.endswith("vmlinuz"))
+            self.assertTrue(iso.initrd.endswith("initrd.img"))
+            self.assertEqual(iso.label, "Fedora-test-iso-x86_64")