Search for efi partition

This patch adds a function that will be responsible to identify
the efi partition on a give device, this is necessary on the Software
Raid scenario and when installing bootloader.

Conflicts:
        ironic_python_agent/tests/unit/test_utils.py
        ironic_python_agent/utils.py

Change-Id: I5f326db2d37b2a15090ec84e477e63f7d92e7447
Co-Authored-By: Raphael Glon <raphael.glon@corp.ovh.com>
(cherry picked from commit 966356e58c786fab1b176767615c481d449076a2)

1 files changed, 24 insertions, 0 deletions

diff --git a/ironic_python_agent/utils.py b/ironic_python_agent/utils.py
index f391b74d..8a804b16 100644
--- a/ironic_python_agent/utils.py
+++ b/ironic_python_agent/utils.py
@@ -17,6 +17,7 @@ import errno
 import glob
 import io
 import os
+import re
 import shutil
 import subprocess
 import tarfile
@@ -60,6 +61,9 @@ COLLECT_LOGS_COMMANDS = {
 }
 
 
+PARTED_ESP_PATTERN = re.compile(r'^\s*(\d+)\s.*\sfat\d*\s.*esp(,|\s|$).*$')
+
+
 def execute(*cmd, **kwargs):
     """Convenience wrapper around ironic_lib's execute() method.
 
@@ -437,3 +441,23 @@ def get_ssl_client_options(conf):
     else:
         cert = None
     return verify, cert
+
+
+def get_efi_part_on_device(device):
+    """Looks for the efi partition on a given device
+
+    :param device: lock device upon which to check for the efi partition
+    :return: the efi partition or None
+    """
+    efi_part = None
+    out, _u = execute('parted', '-s', device, '--', 'print')
+    for line in out.splitlines():
+        m = PARTED_ESP_PATTERN.match(line)
+        if m:
+            efi_part = m.group(1)
+
+            LOG.debug("Found efi partition %s on device %s.", efi_part, device)
+            break
+    else:
+        LOG.debug("No efi partition found on device %s", device)
+    return efi_part