tools/osbuild-mpp: mpp-define-image sfdisk attrs

Add the translation logic to handle the attrs field of sfdisk as
supported by org.osbuild.sfdisk and documented in its schema. With the
schema taking an int array, some translation is required to populate the
sfdisk command appropriately.

Amend the example schema to reflect the change.

Signed-off-by: Eric Chanudet <echanude@redhat.com>

tools/osbuild-mpp

@@ -245,6 +245,7 @@ Example:
           "type": "21686148-6449-6E6F-744E-656564454649",
           "bootable": true,
           "uuid": "FAC7F1FB-3E8D-4137-A512-961DE09A5549"
+          "attrs": [ 60 ]
         },
         ...
     }
@@ -315,7 +316,7 @@ import sys
 import tempfile
 import urllib.parse
 import urllib.request
-from typing import Dict, Optional
+from typing import Dict, List, Optional
 
 import dnf
 import hawkey
@@ -771,7 +772,8 @@ class Partition:
                  size: int = None,
                  bootable: bool = False,
                  name: str = None,
-                 uuid: str = None):
+                 uuid: str = None,
+                 attrs: List[int] = None):
         self.id = uid
         self.type = pttype
         self.start = start
@@ -779,6 +781,7 @@ class Partition:
         self.bootable = bootable
         self.name = name
         self.uuid = uuid
+        self.attrs = attrs
         self.index = None
 
     @property
@@ -797,7 +800,8 @@ class Partition:
                 size=js.get("size"),
                 bootable=js.get("bootable"),
                 name=js.get("name"),
-                uuid=js.get("uuid"))
+                uuid=js.get("uuid"),
+                attrs=js.get("attrs"))
         return p
 
     def to_dict(self):
@@ -815,6 +819,8 @@ class Partition:
             data["name"] = self.name
         if self.uuid:
             data["uuid"] = self.uuid
+        if self.attrs:
+            data["attrs"] = list(self.attrs)
 
         return data
 
@@ -840,10 +846,24 @@ class PartitionTable:
         command = f"label: {self.label}\nlabel-id: {self.uuid}"
         for partition in self.partitions:
             fields = []
-            for field in ["start", "size", "type", "name", "uuid"]:
+            for field in ["start", "size", "type", "name", "uuid", "attrs"]:
                 value = getattr(partition, field)
-                if value:
-                    fields += [f'{field}="{value}"']
+                if not value:
+                    continue
+                if field == "attrs":
+                    resv = {
+                        0: "RequiredPartition",
+                        1: "NoBlockIOProtocol",
+                        2: "LegacyBIOSBootable"
+                    }
+                    attrs = []
+                    for bit in value:
+                        if bit in resv:
+                            attrs.append(resv[bit])
+                        elif 48 <= bit <= 63:
+                            attrs.append(str(bit))
+                    value = ",".join(attrs)
+                fields += [f'{field}="{value}"']
             if partition.bootable:
                 fields += ["bootable"]
             command += "\n" + ", ".join(fields)