storage/v2: report min part size

subiquity/common/filesystem/labels.py

@@ -319,6 +319,7 @@ def _for_client_partition(partition, *, min_size=0):
         offset=partition.offset,
         resize=partition.resize,
         path=partition._path(),
+        estimated_min_size=partition.estimated_min_size,
         mount=partition.mount,
         format=partition.format)
 

subiquity/common/types.py

@@ -268,6 +268,7 @@ class Partition:
     boot: Optional[bool] = None
     os: Optional[OsProber] = None
     offset: Optional[int] = None
+    estimated_min_size: Optional[int] = -1
     resize: Optional[bool] = None
     path: Optional[str] = None
 

subiquity/models/filesystem.py

@@ -702,6 +702,16 @@ class Partition(_Formattable):
         from subiquity.common.filesystem import boot
         return boot.is_bootloader_partition(self)
 
+    @property
+    def estimated_min_size(self):
+        fs_data = self._m._probe_data.get('filesystem', {}).get(self._path())
+        if fs_data is None:
+            return -1
+        val = fs_data.get('ESTIMATED_MIN_SIZE')
+        if val == 0:
+            return self.device.alignment_data().part_align
+        return val
+
     @property
     def ok_for_raid(self):
         if self.boot: