Fat32Content: enforce fat32

mkfs.vfat can create fat 12, 16 and 32.
By default it uses whatever fits best.
Since the module is called Fat32, it should always create a fat32 filesystem

embdgen-core/src/embdgen/plugins/content/Fat32Content.py

@@ -40,6 +40,7 @@ def _prepare_result(self):
 
         subprocess.run([
                 "mkfs.vfat",
+                "-F", "32",
                 self.result_file
             ],
             check=True,

embdgen-core/tests/content/test_Fat32Content.py

@@ -16,11 +16,13 @@
 class MInfo(SimpleCommandParser):
     ATTRIBUTE_MAP =  {
         "sector size": ("sector_size", lambda x: int(x.split()[0])),
-        "big size": ("sectors", lambda x: int(x.split()[0]))
+        "big size": ("sectors", lambda x: int(x.split()[0])),
+        "disk type": ("disk_type", lambda x: x[1:-1].strip())
     }
 
     sectors: int = -1
     sector_size: int = -1
+    disk_type: str = ""
 
     def __init__(self, image: Path) -> None:
         super().__init__(["minfo", "-i", image])
@@ -50,12 +52,12 @@ def test_files(self, tmp_path: Path):
             obj.prepare()
         assert obj.size.is_undefined
 
-        obj.size = SizeType.parse("10MB")
+        obj.size = SizeType.parse("32MB")
         obj.prepare()
 
         with image.open("wb") as out_file:
             obj.write(out_file)
-        assert image.stat().st_size == SizeType.parse("10MB").bytes
+        assert image.stat().st_size == SizeType.parse("32MB").bytes
 
         res = subprocess.run([
             "mdir",
@@ -79,3 +81,17 @@ def test_empty(self, tmp_path: Path) -> None:
         minfo = MInfo(image)
         assert minfo.ok, minfo.error
 
+    def test_type_small(self, tmp_path: Path) -> None:
+        BuildLocation().set_path(tmp_path)
+        image = tmp_path / "image"
+
+        obj = Fat32Content()
+        obj.size = SizeType.parse("10 MB")
+        obj.prepare()
+
+        with image.open("wb") as out_file:
+            obj.write(out_file)
+
+        minfo = MInfo(image)
+        assert minfo.ok, minfo.error
+        assert minfo.disk_type == "FAT32"

embdgen-core/tests/test_utils/SimpleCommandParser.py

@@ -21,7 +21,7 @@ def __init__(self, command: Iterable[str]) -> None:
         self.ok = ret.returncode == 0
 
         for line in ret.stdout.splitlines():
-            splits = re.split(r":\s+", line.strip(), 1)
+            splits = re.split(r"[:=]", line.strip(), 1)
             if len(splits) != 2:
                 continue
             key, value = splits