Add support to get mdadm attribs on create

src/idmslinux_installer/util/mdadm.py

@@ -15,7 +15,7 @@
 
 """Support class for mdadm."""
 
-from typing import List
+from typing import Dict, List
 
 from idmslinux_installer.util.asyncsubprocess import (AsyncSubprocess,
                                                       OutputCallback)
@@ -28,8 +28,8 @@ class Mdadm:
     def __init__(self, load: bool = True):
         """Initialize our class and load system partition types."""
 
-    def create(self, md_device: str, level: int, devices: List[str], output_callback: OutputCallback = None):
-        """Create RAID device."""
+    def create(self, md_device: str, level: int, devices: List[str], output_callback: OutputCallback = None) -> Dict[str, str]:
+        """Create a RAID device and return the details in a dict."""
 
         # If we didn't get an output_callback, set it to our own class method
         if not output_callback:
@@ -47,6 +47,22 @@ class Mdadm:
         if proc.retcode != 0:
             raise OSError(f'Failed to create md device {md_device} return code {proc.retcode}')
 
+        # Grab the UUID
+        proc = AsyncSubprocess(['mdadm', '--detail', '--export', md_device])
+        result = proc.run()
+
+        # Raise an exception if we didn't get a positive response back
+        if proc.retcode != 0:
+            raise OSError(f'Failed to get mdadm attributes from device {md_device} return code {proc.retcode}')
+
+        # Strip value, then split on the =
+        attribs: Dict[str, str] = {}
+        for line in result:
+            key, value = line.rstrip().split('=', 1)
+            attribs[key] = value
+
+        return attribs
+
     def _default_output_callback(self, line: str):
         line.rstrip()
         print(f'mdadm: {line}')