Recognize uppercase vfat disk labels

New mkfs.vfat and fatlabel tools included in the dosfsutils package no
longer support creating vfat disks with lowercase labels. They silently
default to an all uppercase label eg CONFIG-2 instead of config-2. This
change makes cloud-init handle either upper or lower case.

LP: #1598783

4 files changed, 28 insertions, 3 deletions

diff --git a/cloudinit/sources/DataSourceConfigDrive.py b/cloudinit/sources/DataSourceConfigDrive.py
index 870b3688..b8db6267 100644
--- a/cloudinit/sources/DataSourceConfigDrive.py
+++ b/cloudinit/sources/DataSourceConfigDrive.py
@@ -25,7 +25,7 @@ DEFAULT_METADATA = {
     "instance-id": DEFAULT_IID,
 }
 FS_TYPES = ('vfat', 'iso9660')
-LABEL_TYPES = ('config-2',)
+LABEL_TYPES = ('config-2', 'CONFIG-2')
 POSSIBLE_MOUNTS = ('sr', 'cd')
 OPTICAL_DEVICES = tuple(('/dev/%s%s' % (z, i) for z in POSSIBLE_MOUNTS
                         for i in range(0, 2)))
@@ -224,7 +224,7 @@ def find_candidate_devs(probe_optical=True):
     config drive v2:
        Disk should be:
         * either vfat or iso9660 formated
-        * labeled with 'config-2'
+        * labeled with 'config-2' or 'CONFIG-2'
     """
     # query optical drive to get it in blkid cache for 2.6 kernels
     if probe_optical:
diff --git a/tests/unittests/test_datasource/test_configdrive.py b/tests/unittests/test_datasource/test_configdrive.py
index 6ef5a35c..68400f22 100644
--- a/tests/unittests/test_datasource/test_configdrive.py
+++ b/tests/unittests/test_datasource/test_configdrive.py
@@ -458,6 +458,12 @@ class TestConfigDriveDataSource(CiTestCase):
             self.assertEqual(["/dev/vdb3"],
                              ds.find_candidate_devs())
 
+            # Verify that uppercase labels are also found.
+            devs_with_answers = {"TYPE=vfat": [],
+                                 "TYPE=iso9660": ["/dev/vdb"],
+                                 "LABEL=CONFIG-2": ["/dev/vdb"]}
+            self.assertEqual(["/dev/vdb"], ds.find_candidate_devs())
+
         finally:
             util.find_devs_with = orig_find_devs_with
             util.is_partition = orig_is_partition
diff --git a/tests/unittests/test_ds_identify.py b/tests/unittests/test_ds_identify.py
index c9234edd..ad6c5cf4 100644
--- a/tests/unittests/test_ds_identify.py
+++ b/tests/unittests/test_ds_identify.py
@@ -232,6 +232,11 @@ class TestDsIdentify(CiTestCase):
         self._test_ds_found('ConfigDrive')
         return
 
+    def test_config_drive_upper(self):
+        """ConfigDrive datasource has a disk with LABEL=CONFIG-2."""
+        self._test_ds_found('ConfigDriveUpper')
+        return
+
     def test_policy_disabled(self):
         """A Builtin policy of 'disabled' should return not found.
 
@@ -503,6 +508,18 @@ VALID_CFG = {
              },
         ],
     },
+    'ConfigDriveUpper': {
+        'ds': 'ConfigDrive',
+        'mocks': [
+            {'name': 'blkid', 'ret': 0,
+             'out': blkid_out(
+                 [{'DEVNAME': 'vda1', 'TYPE': 'vfat', 'PARTUUID': uuid4()},
+                  {'DEVNAME': 'vda2', 'TYPE': 'ext4',
+                   'LABEL': 'cloudimg-rootfs', 'PARTUUID': uuid4()},
+                  {'DEVNAME': 'vdb', 'TYPE': 'vfat', 'LABEL': 'CONFIG-2'}])
+             },
+        ],
+    },
 }
 
 # vi: ts=4 expandtab
diff --git a/tools/ds-identify b/tools/ds-identify
index 5893a761..374c3ad1 100755
--- a/tools/ds-identify
+++ b/tools/ds-identify
@@ -579,6 +579,8 @@ dscheck_NoCloud() {
 check_configdrive_v2() {
     if has_fs_with_label "config-2"; then
         return ${DS_FOUND}
+    elif has_fs_with_label "CONFIG-2"; then
+        return ${DS_FOUND}
     fi
     # look in /config-drive <vlc>/seed/config_drive for a directory
     # openstack/YYYY-MM-DD format with a file meta_data.json
@@ -666,7 +668,7 @@ is_cdrom_ovf() {
 
     # explicitly skip known labels of other types. rd_rdfe is azure.
     case "$label" in
-        config-2|rd_rdfe_stable*|cidata) return 1;;
+        config-2|CONFIG-2|rd_rdfe_stable*|cidata) return 1;;
     esac
 
     local idstr="http://schemas.dmtf.org/ovf/environment/1"