Add swap support

Adds swap as a valid "filesystem"

Closes-Bug: #1816136
Change-Id: Ie50834a9834815b1dfacafd283f505f3323d35c8
Co-Authored-By: luke.odom <luke.odom@dreamhost.com>
Signed-off-by: Maksim Malchuk <maksim.malchuk@gmail.com>

diskimage_builder/block_device/level2/mkfs.py

@@ -33,7 +33,8 @@ file_system_max_label_length = {
     "ext3": 16,
     "ext4": 16,
     "xfs": 12,
-    "vfat": 11
+    "vfat": 11,
+    "swap": 16
 }
 
 
@@ -102,8 +103,10 @@ class FilesystemNode(NodeBase):
         return (edge_from, edge_to)
 
     def create(self):
+        if self.type in ('swap'):
+            cmd = ["mkswap"]
+        else:
             cmd = ["mkfs"]
-
             cmd.extend(['-t', self.type])
             if self.opts:
                 cmd.extend(self.opts)
@@ -113,7 +116,7 @@ class FilesystemNode(NodeBase):
         else:
             cmd.extend(["-L", self.label])
 
-        if self.type in ('ext2', 'ext3', 'ext4'):
+        if self.type in ('ext2', 'ext3', 'ext4', 'swap'):
             cmd.extend(['-U', self.uuid])
         elif self.type == 'xfs':
             cmd.extend(['-m', "uuid=%s" % self.uuid])

diskimage_builder/block_device/level3/mount.py

@@ -72,6 +72,10 @@ class MountPointNode(NodeBase):
         return (edge_from, edge_to)
 
     def create(self):
+        if (self.state['filesys'][self.base]['fstype'] == 'swap'):
+            # No need to mount/activate swap during image build.
+            mount_point = self.mount_point = 'none'
+        else:
             logger.debug("mount called [%s]", self.mount_point)
             rel_mp = self.mount_point if self.mount_point[0] != '/' \
                 else self.mount_point[1:]
@@ -94,6 +98,9 @@ class MountPointNode(NodeBase):
         self.state['mount_order'].append(self.mount_point)
 
     def umount(self):
+        if (self.state['filesys'][self.base]['fstype'] == 'swap'):
+            # Swap not mounted/activated during image build.
+            return
         logger.info("Called for [%s]", self.name)
         # Before calling umount, call 'fstrim' on suitable mounted
         # file systems.  This discards unused blocks from the mounted

diskimage_builder/block_device/level4/fstab.py

@@ -40,12 +40,15 @@ class FstabNode(NodeBase):
         if 'fstab' not in self.state:
             self.state['fstab'] = {}
 
+        swap = 'none' in self.state['mount'] and \
+            self.state['mount']['none']['name'] == self.base
+
         self.state['fstab'][self.base] = {
             'name': self.name,
             'base': self.base,
-            'options': self.options,
+            'options': 'sw' if swap else self.options,
-            'dump-freq': self.dump_freq,
+            'dump-freq': 0 if swap else self.dump_freq,
-            'fsck-passno': self.fsck_passno
+            'fsck-passno': 0 if swap else self.fsck_passno
         }
 
 

diskimage_builder/block_device/tests/config/lvm_tree_partition_ordering.yaml

@@ -7,10 +7,10 @@
     label: mbr
     partitions:
       - name: boot
-        flags: [ boot,primary ]
+        flags: [boot, primary]
         size: 1G
       - name: root
-        flags: [ primary ]
+        flags: [primary]
         size: 3G
 
 - lvm:
@@ -27,12 +27,16 @@
     lvs:
       - name: lv_root
         base: vg
-        size: 2000M
+        size: 1900M
 
       - name: lv_var
         base: vg
         size: 500M
 
+      - name: lv_swap
+        base: vg
+        size: 100M
+
 - mkfs:
     base: boot
     type: ext3
@@ -62,3 +66,13 @@
       fstab:
         options: "noacl"
         fsck-passno: 2
+
+- mkfs:
+    name: mkfs_swap
+    base: lv_swap
+    type: "swap"
+    mount:
+      mount_point: none
+      fstab:
+        options: "sw"
+        fsck-passno: 0

diskimage_builder/block_device/tests/config/multiple_partitions_graph.yaml

@@ -8,14 +8,17 @@
     partitions:
       - name: root
         base: image0
-          flags: [ boot, primary ]
+        flags: [boot, primary]
-          size: 55%
+        size: 54%
       - name: var
         base: image0
         size: 40%
       - name: var_log
         base: image0
         size: 5%
+      - name: swap
+        base: image0
+        size: 1%
 
 - mkfs:
     base: root
@@ -67,3 +70,20 @@
     name: fstab_mount_mkfs_var_log
     fsck-passno: 1
     options: defaults
+
+- mkfs:
+    base: swap
+    name: mkfs_swap
+    type: swap
+    uuid: swap-uuid-1234
+
+- mount:
+    base: mkfs_swap
+    name: mount_mkfs_swap
+    mount_point: none
+
+- fstab:
+    base: mount_mkfs_swap
+    name: fstab_mount_mkfs_swap
+    fsck-passno: 0
+    options: sw

diskimage_builder/block_device/tests/config/multiple_partitions_tree.yaml

@@ -7,8 +7,8 @@
     label: mbr
     partitions:
       - name: root
-          flags: [ boot, primary ]
+        flags: [boot, primary]
-          size: 55%
+        size: 54%
         mkfs:
           type: xfs
           uuid: root-uuid-1234
@@ -37,4 +37,13 @@
             fstab:
               options: "defaults"
               fsck-passno: 1
-
+      - name: swap
+        size: 1%
+        mkfs:
+          type: swap
+          uuid: swap-uuid-1234
+          mount:
+            mount_point: none
+            fstab:
+              fsck-passno: 0
+              options: "sw"

diskimage_builder/block_device/tests/test_mount_order.py

@@ -80,6 +80,7 @@ class TestMountOrder(tc.TestGraphGeneration):
         state['blockdev']['root'] = {'device': '/dev/loopXp1/root'}
         state['blockdev']['var'] = {'device': '/dev/loopXp2/var'}
         state['blockdev']['var_log'] = {'device': '/dev/loopXp3/var_log'}
+        state['blockdev']['swap'] = {'device': '/dev/loopXp4/swap'}
 
         for node in call_order:
             if isinstance(node, (FilesystemNode, MountPointNode)):
@@ -89,7 +90,8 @@ class TestMountOrder(tc.TestGraphGeneration):
                 node.umount()
 
         # ensure that partitions were mounted in order root->var->var/log
-        self.assertListEqual(state['mount_order'], ['/', '/var', '/var/log'])
+        self.assertListEqual(state['mount_order'],
+                             ['/', '/var', '/var/log', 'none'])
 
         # fs creation sequence (note we don't care about order of this
         # as they're all independent)
@@ -101,7 +103,9 @@ class TestMountOrder(tc.TestGraphGeneration):
                        '-m', 'uuid=var-uuid-1234',
                        '-q', '/dev/loopXp2/var']),
             mock.call(['mkfs', '-t', 'vfat', '-n', 'VARLOG',
-                       '/dev/loopXp3/var_log'])
+                       '/dev/loopXp3/var_log']),
+            mock.call(['mkswap', '-L', 'mkfs_swap', '-U', 'swap-uuid-1234',
+                       '/dev/loopXp4/swap'])
         ]
         self.assertEqual(mock_exec_sudo_mkfs.call_count, len(cmd_sequence))
         mock_exec_sudo_mkfs.assert_has_calls(cmd_sequence, any_order=True)
@@ -154,6 +158,10 @@ class TestMountOrder(tc.TestGraphGeneration):
                 'device': '/dev/loopXp3',
                 'fstype': 'vfat',
             },
+            'mkfs_swap': {
+                'device': '/dev/loopXp4',
+                'fstype': 'swap',
+            },
         }
 
         for node in call_order:
@@ -164,7 +172,9 @@ class TestMountOrder(tc.TestGraphGeneration):
                 node.umount()
 
         # ensure that partitions are mounted in order / -> /boot -> /var
-        self.assertListEqual(state['mount_order'], ['/', '/boot', '/var'])
+        # swap not mounted in runtime, but should be in 'mount_order' list
+        self.assertListEqual(state['mount_order'],
+                             ['/', '/boot', '/var', 'none'])
 
         cmd_sequence = [
             # mount sequence

releasenotes/notes/swap_support-9ac267f56a0c0424.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - |
+    Adds swap as a valid "filesystem" for block devices