tools/qvm-backup: allow to disable compression

Specify compression explicitly in the backup profile, not only when
requested with --compress or --compress-filter.
This will allow to disable compression with --no-compress option, as the
default if no compression is specified in the profile is to use gzip.

Fixes QubesOS/qubes-issues#4803

doc/manpages/qvm-backup.rst

@@ -53,7 +53,11 @@ Options
 
 .. option:: --compress, -z
 
-   Compress the backup
+   Compress the backup. This is default.
+
+.. option:: --no-compress,
+
+   Do not compress the backup.
 
 .. option:: --compress-filter, -Z
 

qubesadmin/tests/tools/qvm_backup.py

@@ -33,7 +33,8 @@ class TC_00_qvm_backup(qubesadmin.tests.QubesTestCase):
         profile = io.StringIO()
         qvm_backup.write_backup_profile(profile, args)
         expected_profile = (
-            '{destination_path: /var/tmp, destination_vm: dom0, include: null}\n'
+            '{compression: true, destination_path: /var/tmp, '
+            'destination_vm: dom0, include: null}\n'
         )
         self.assertEqual(profile.getvalue(), expected_profile)
 
@@ -48,6 +49,7 @@ class TC_00_qvm_backup(qubesadmin.tests.QubesTestCase):
         profile = io.StringIO()
         qvm_backup.write_backup_profile(profile, args)
         expected_profile = (
+            'compression: true\n'
             'destination_path: /var/tmp\n'
             'destination_vm: dom0\n'
             'include: [vm1, vm2]\n'
@@ -61,6 +63,7 @@ class TC_00_qvm_backup(qubesadmin.tests.QubesTestCase):
         profile = io.StringIO()
         qvm_backup.write_backup_profile(profile, args)
         expected_profile = (
+            'compression: true\n'
             'destination_path: /var/tmp\n'
             'destination_vm: dom0\n'
             'exclude: [vm1, vm2]\n'
@@ -73,7 +76,20 @@ class TC_00_qvm_backup(qubesadmin.tests.QubesTestCase):
         profile = io.StringIO()
         qvm_backup.write_backup_profile(profile, args, passphrase='test123')
         expected_profile = (
-            '{destination_path: /var/tmp, destination_vm: dom0, include: null, passphrase_text: test123}\n'
+            '{compression: true, destination_path: /var/tmp, '
+            'destination_vm: dom0, include: null,\n'
+            '  passphrase_text: test123}\n'
+        )
+        self.assertEqual(profile.getvalue(), expected_profile)
+
+    def test_004_write_backup_profile_no_compress(self):
+        args = qvm_backup.parser.parse_args(['--no-compress', '/var/tmp'],
+            app=self.app)
+        profile = io.StringIO()
+        qvm_backup.write_backup_profile(profile, args)
+        expected_profile = (
+            '{compression: false, destination_path: /var/tmp, '
+            'destination_vm: dom0, include: null}\n'
         )
         self.assertEqual(profile.getvalue(), expected_profile)
 
@@ -93,7 +109,8 @@ class TC_00_qvm_backup(qubesadmin.tests.QubesTestCase):
             qvm_backup.main(['--save-profile', 'test-profile', '/var/tmp'],
                 app=self.app)
             expected_profile = (
-                '{destination_path: /var/tmp, destination_vm: dom0, include: null}\n'
+                '{compression: true, destination_path: /var/tmp, '
+                'destination_vm: dom0, include: null}\n'
             )
             with open(profile_path) as f:
                 self.assertEqual(expected_profile, f.read())
@@ -119,8 +136,9 @@ class TC_00_qvm_backup(qubesadmin.tests.QubesTestCase):
             qvm_backup.main(['--save-profile', 'test-profile', '/var/tmp'],
                 app=self.app)
             expected_profile = (
-                '{destination_path: /var/tmp, destination_vm: dom0, include: null, passphrase_text: some\n'
-                '    password}\n'
+                '{compression: true, destination_path: /var/tmp, '
+                'destination_vm: dom0, include: null,\n'
+                '  passphrase_text: some password}\n'
             )
             with open(profile_path) as f:
                 self.assertEqual(expected_profile, f.read())
@@ -177,6 +195,7 @@ class TC_00_qvm_backup(qubesadmin.tests.QubesTestCase):
             'To perform the backup according to selected options, create '
             'backup profile (/tmp/profile_name.conf) in dom0 with following '
             'content:\n'
+            'compression: true\n'
             'destination_path: /var/tmp\n'
             'destination_vm: dom0\n'
             'exclude: [vm1]\n'
@@ -210,8 +229,9 @@ class TC_00_qvm_backup(qubesadmin.tests.QubesTestCase):
                     'test-profile', '/var/tmp'],
                     app=self.app)
             expected_profile = (
-                '{destination_path: /var/tmp, destination_vm: dom0, include: null, passphrase_text: other\n'
-                '    passphrase}\n'
+                '{compression: true, destination_path: /var/tmp, '
+                'destination_vm: dom0, include: null,\n'
+                '  passphrase_text: other passphrase}\n'
             )
             with open(profile_path) as f:
                 self.assertEqual(expected_profile, f.read())

qubesadmin/tools/qvm_backup.py

@@ -65,8 +65,11 @@ no_profile.add_argument("--passphrase-file", "-p", action="store",
     help="Read passphrase from a file, or use '-' to read "
          "from stdin")
 no_profile.add_argument("--compress", "-z", action="store_true",
-    dest="compression", default=False,
-    help="Compress the backup")
+    dest="compression", default=True,
+    help="Compress the backup (default)")
+no_profile.add_argument("--no-compress", action="store_false",
+    dest="compression",
+    help="Do not compress the backup")
 no_profile.add_argument("--compress-filter", "-Z", action="store",
     dest="compression",
     help="Specify a non-default compression filter program "
@@ -99,8 +102,7 @@ def write_backup_profile(output_stream, args, passphrase=None):
         profile_data['exclude'] = args.exclude_list
     if passphrase:
         profile_data['passphrase_text'] = passphrase
-    if args.compression:
-        profile_data['compression'] = args.compression
+    profile_data['compression'] = args.compression
     if args.appvm:
         profile_data['destination_vm'] = args.appvm
     else: