Ignore devices with size 0 when collecting inventory

delete_configuration still fetches all devices as it needs to clean
ones with broken RAID.

Story: #2007907
Task: #40307
Change-Id: I4b0be2b0755108490f9cd3c4f3b71a5e036761a1

ironic_python_agent/hardware.py

@@ -294,7 +294,8 @@ def _md_scan_and_assemble():
 
 def list_all_block_devices(block_type='disk',
                            ignore_raid=False,
-                           ignore_floppy=True):
+                           ignore_floppy=True,
+                           ignore_empty=True):
     """List all physical block devices
 
     The switches we use for lsblk: P for KEY="value" output, b for size output
@@ -310,6 +311,7 @@ def list_all_block_devices(block_type='disk',
                         devices and should be treated as such if encountered.
     :param ignore_floppy: Ignore floppy disk devices in the block device
                           list. By default, these devices are filtered out.
+    :param ignore_empty: Whether to ignore disks with size equal 0.
     :return: A list of BlockDevices
     """
 
@@ -403,6 +405,12 @@ def list_all_block_devices(block_type='disk',
             LOG.debug('Skipping RAM device %s', device)
             continue
 
+        # NOTE(dtantsur): some hardware represents virtual floppy devices as
+        # normal block devices with size 0. Filter them out.
+        if ignore_empty and not int(device['SIZE'] or 0):
+            LOG.debug('Skipping device %s with zero size', device)
+            continue
+
         name = os.path.join('/dev', device['KNAME'])
 
         try:
@@ -1780,7 +1788,8 @@ class GenericHardwareManager(HardwareManager):
             utils.execute('mdadm', '--assemble', '--scan',
                           check_exit_code=False)
             raid_devices = list_all_block_devices(block_type='raid',
-                                                  ignore_raid=False)
+                                                  ignore_raid=False,
+                                                  ignore_empty=False)
             return raid_devices
 
         raid_devices = _scan_raids()

ironic_python_agent/tests/unit/test_hardware.py

@@ -137,7 +137,8 @@ BLK_DEVICE_TEMPLATE = (
     'KNAME="ram1" MODEL="" SIZE="8388608" ROTA="0" TYPE="disk"\n'
     'KNAME="ram2" MODEL="" SIZE="8388608" ROTA="0" TYPE="disk"\n'
     'KNAME="ram3" MODEL="" SIZE="8388608" ROTA="0" TYPE="disk"\n'
-    'KNAME="fd1" MODEL="magic" SIZE="4096" ROTA="1" TYPE="disk"'
+    'KNAME="fd1" MODEL="magic" SIZE="4096" ROTA="1" TYPE="disk"\n'
+    'KNAME="sdf" MODEL="virtual floppy" SIZE="0" ROTA="1" TYPE="disk"'
 )
 
 # NOTE(pas-ha) largest device is 1 byte smaller than 4GiB
@@ -168,7 +169,8 @@ RAID_BLK_DEVICE_TEMPLATE = (
     'KNAME="md0" MODEL="RAID" SIZE="1765517033470" '
     'ROTA="0" TYPE="raid1"\n'
     'KNAME="md0" MODEL="RAID" SIZE="1765517033470" '
-    'ROTA="0" TYPE="raid1"'
+    'ROTA="0" TYPE="raid1"\n'
+    'KNAME="md1" MODEL="RAID" SIZE="" ROTA="0" TYPE="raid1"'
 )
 RAID_BLK_DEVICE_TEMPLATE_DEVICES = [
     hardware.BlockDevice(name='/dev/sda', model='DRIVE 0',
@@ -180,6 +182,9 @@ RAID_BLK_DEVICE_TEMPLATE_DEVICES = [
     hardware.BlockDevice(name='/dev/md0', model='RAID',
                          size=1765517033470, rotational=False,
                          vendor="FooTastic"),
+    hardware.BlockDevice(name='/dev/md1', model='RAID',
+                         size=0, rotational=False,
+                         vendor="FooTastic"),
 ]
 
 SHRED_OUTPUT_0_ITERATIONS_ZERO_FALSE = ()
@@ -4264,7 +4269,7 @@ class TestModuleFunctions(base.IronicAgentTest):
         mocked_readlink.return_value = '../../sda'
         mocked_fromdevfile.return_value = {}
         mocked_execute.return_value = (RAID_BLK_DEVICE_TEMPLATE, '')
-        result = hardware.list_all_block_devices()
+        result = hardware.list_all_block_devices(ignore_empty=False)
         mocked_execute.assert_called_once_with(
             'lsblk', '-Pbia', '-oKNAME,MODEL,SIZE,ROTA,TYPE',
             check_exit_code=[0])

releasenotes/notes/zero-size-78d3be2ac8fd59c2.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Devices with size 0 are now ignored when collecting inventory. Some
+    hardware represents virtual floppy devices this way, see e.g.
+    https://www.dell.com/community/Systems-Management-General/How-to-disable-iDRAC-Virtual-CD/td-p/4734424