Read GPT label using sgdisk rather than udev

The Ceph osd bootstrap/startup logic depends upon reading/writing
partition names.  Some older versions of udev have trouble reading these
(/dev/disk/by-label is missing).

To work around this, we shell out to sgdisk and scrape the partition
name data directly.

Co-authored-by: Paul Bourke <paul.bourke@oracle.com>
Closes-Bug: 1585185
Change-Id: I362b3f8e91de79687fc84e256996fbcaf303b6af

ansible/roles/ceph/tasks/bootstrap_osds.yml

@@ -1,6 +1,6 @@
 ---
 - name: Looking up disks to bootstrap for Ceph OSDs
-  command: docker exec -t kolla_toolbox /usr/bin/ansible localhost
+  command: docker exec -t kolla_toolbox sudo -E /usr/bin/ansible localhost
     -m find_disks
     -a "partition_name='KOLLA_CEPH_OSD_BOOTSTRAP' match_mode='prefix'"
   register: osd_lookup
@@ -12,7 +12,7 @@
     osds_bootstrap: "{{ (osd_lookup.stdout.split('localhost | SUCCESS => ')[1]|from_json).disks|from_json }}"
 
 - name: Looking up disks to bootstrap for Ceph Cache OSDs
-  command: docker exec -t kolla_toolbox /usr/bin/ansible localhost
+  command: docker exec -t kolla_toolbox sudo -E /usr/bin/ansible localhost
     -m find_disks
     -a "partition_name='KOLLA_CEPH_OSD_CACHE_BOOTSTRAP' match_mode='prefix'"
   register: osd_cache_lookup

ansible/roles/ceph/tasks/do_reconfigure.yml

@@ -10,7 +10,7 @@
     - { name: ceph_mon, group: ceph-mon }
 
 - name: Looking up OSDs for Ceph
-  command: docker exec -t kolla_toolbox /usr/bin/ansible localhost
+  command: docker exec -t kolla_toolbox sudo -E /usr/bin/ansible localhost
     -m find_disks
     -a "partition_name='KOLLA_CEPH_DATA' match_mode='prefix'"
   register: osd_lookup

ansible/roles/ceph/tasks/start_osds.yml

@@ -1,6 +1,6 @@
 ---
 - name: Looking up OSDs for Ceph
-  command: docker exec -t kolla_toolbox /usr/bin/ansible localhost
+  command: docker exec -t kolla_toolbox sudo -E /usr/bin/ansible localhost
     -m find_disks
     -a "partition_name='KOLLA_CEPH_DATA' match_mode='prefix'"
   register: osd_lookup

ansible/roles/swift/tasks/start.yml

@@ -1,6 +1,6 @@
 ---
 - name: Looking up disks for Swift
-  command: docker exec -t kolla_toolbox /usr/bin/ansible localhost
+  command: docker exec -t kolla_toolbox sudo -E /usr/bin/ansible localhost
     -m find_disks
     -a "name={{ swift_devices_name }}
         match_mode={{ swift_devices_match_mode }}"

docker/kolla-toolbox/Dockerfile.j2

@@ -7,6 +7,7 @@ MAINTAINER {{ maintainer }}
 
 RUN yum -y install \
         gcc \
+        gdisk \
         git \
         libffi-devel \
         libxml2-devel \
@@ -23,6 +24,7 @@ RUN yum -y install \
 RUN apt-get -y --no-install-recommends install \
         build-essential \
         ca-certificates \
+        gdisk \
         git \
         libffi-dev \
         libmariadbclient-dev \
@@ -56,6 +58,9 @@ RUN useradd -m --user-group ansible --groups kolla \
 COPY find_disks.py kolla_keystone_service.py kolla_keystone_user.py kolla_sanity.py kolla_zookeeper.py /usr/share/ansible/
 COPY ansible.cfg /home/ansible/.ansible.cfg
 
+COPY ansible_sudoers /etc/sudoers.d/ansible_sudoers
+RUN chmod 440 /etc/sudoers.d/ansible_sudoers
+
 CMD ["/bin/sleep", "infinity"]
 
 {{ include_footer }}

docker/kolla-toolbox/ansible_sudoers

@@ -0,0 +1 @@
+ansible ALL=(root) NOPASSWD: /usr/bin/ansible localhost -m find_disks -a *

docker/kolla-toolbox/find_disks.py

@@ -67,11 +67,36 @@ EXAMPLES = '''
 import json
 import pyudev
 import re
+import subprocess
+
+
+def get_id_part_entry_name(dev):
+    # NOTE(pbourke): Old versions of udev have trouble retrieving GPT partition
+    # labels. In this case shell out to sgdisk.
+    try:
+        udev_version = pyudev.udev_version()
+    except (ValueError, EnvironmentError, subprocess.CalledProcessError):
+        udev_version = -1
+
+    if udev_version >= 180:
+        dev_name = dev.get('ID_PART_ENTRY_NAME', '')
+    else:
+        part = re.sub(r'.*[^\d]', '', dev.device_node)
+        parent = dev.find_parent('block').device_node
+        # NOTE(Mech422): Need to use -i as -p truncates the partition name
+        out = subprocess.Popen(['/usr/sbin/sgdisk', '-i', part, parent],
+                               stdout=subprocess.PIPE).communicate()
+        match = re.search(r'Partition name: \'(\w+)\'', out[0])
+        if match:
+            dev_name = match.group(1)
+        else:
+            dev_name = ''
+    return dev_name
 
 
 def is_dev_matched_by_name(dev, name, mode):
     if dev.get('DEVTYPE', '') == 'partition':
-        dev_name = dev.get('ID_PART_ENTRY_NAME', '')
+        dev_name = get_id_part_entry_name(dev)
     else:
         dev_name = dev.get('ID_FS_LABEL', '')
 
@@ -107,7 +132,7 @@ def extract_disk_info(ct, dev, name):
             kwargs['journal_num'] = 2
         else:
             kwargs['external_journal'] = True
-            journal_name = dev.get('ID_PART_ENTRY_NAME', '') + '_J'
+            journal_name = get_id_part_entry_name(dev) + '_J'
             for journal in find_disk(ct, journal_name, 'strict'):
                 kwargs['journal'] = journal.device_node
                 kwargs['journal_device'] = \