wic: Add extra-space argument

This allows extra space to be added after the last partition and is
especially useful when free space is needed for ex: adding partitions on
first boot with ex: systemd-repart[1] and the image is tested in QEMU.

[1] https://www.freedesktop.org/software/systemd/man/systemd-repart.html

(From OE-Core rev: f81b188bcf5aa18746fd622eb7b5c0dcb0b5c93d)

Signed-off-by: Kristian Klausen <kristian@klausen.dk>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/lib/wic/plugins/imager/direct.py

@@ -77,7 +77,8 @@ class DirectPlugin(ImagerPlugin):
 
         image_path = self._full_path(self.workdir, self.parts[0].disk, "direct")
         self._image = PartitionedImage(image_path, self.ptable_format,
-                                       self.parts, self.native_sysroot)
+                                       self.parts, self.native_sysroot,
+                                       options.extra_space)
 
     def setup_workdir(self, workdir):
         if workdir:
@@ -293,7 +294,7 @@ class PartitionedImage():
     Partitioned image in a file.
     """
 
-    def __init__(self, path, ptable_format, partitions, native_sysroot=None):
+    def __init__(self, path, ptable_format, partitions, native_sysroot=None, extra_space=0):
         self.path = path  # Path to the image file
         self.numpart = 0  # Number of allocated partitions
         self.realpart = 0 # Number of partitions in the partition table
@@ -314,6 +315,7 @@ class PartitionedImage():
         self.sector_size = SECTOR_SIZE
         self.native_sysroot = native_sysroot
         num_real_partitions = len([p for p in self.partitions if not p.no_table])
+        self.extra_space = extra_space
 
         # calculate the real partition number, accounting for partitions not
         # in the partition table and logical partitions
@@ -483,6 +485,7 @@ class PartitionedImage():
             self.min_size += GPT_OVERHEAD
 
         self.min_size *= self.sector_size
+        self.min_size += self.extra_space
 
     def _create_partition(self, device, parttype, fstype, start, size):
         """ Create a partition on an image described by the 'device' object. """

scripts/wic

@@ -346,6 +346,8 @@ def wic_init_parser_create(subparser):
                       default=False, help="output debug information")
     subparser.add_argument("-i", "--imager", dest="imager",
                       default="direct", help="the wic imager plugin")
+    subparser.add_argument("--extra-space", type=int, dest="extra_space",
+                      default=0, help="additional free disk space to add to the image")
     return