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Commit 001c676b authored by Julius D'souza's avatar Julius D'souza
Browse files

Add the option to reserve headroom for partition images. 

This is useful for devices with low disk space with different
build variants.

Bug: 37469715
Test: Regular image builds successfully, errors occur when
the headroom size is greater than available partition space.

Change-Id: I526cdd0f84981bbd16e3afcfe1cd7fc43dce98ef
parent 4a3dc145

core/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -897,6 +897,7 @@ $(if $(BOARD_SYSTEMIMAGE_SQUASHFS_COMPRESSOR_OPT),$(hide) echo "system_squashfs_ 
$(if $(BOARD_SYSTEMIMAGE_SQUASHFS_BLOCK_SIZE),$(hide) echo "system_squashfs_block_size=$(BOARD_SYSTEMIMAGE_SQUASHFS_BLOCK_SIZE)" >> $(1))

$(if $(BOARD_SYSTEMIMAGE_SQUASHFS_DISABLE_4K_ALIGN),$(hide) echo "system_squashfs_disable_4k_align=$(BOARD_SYSTEMIMAGE_SQUASHFS_DISABLE_4K_ALIGN)" >> $(1))

$(if $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_SYSTEM_BASE_FS_PATH),$(hide) echo "system_base_fs_file=$(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_SYSTEM_BASE_FS_PATH)" >> $(1))

$(if $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_SYSTEM_HEADROOM),$(hide) echo "system_headroom=$(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_SYSTEM_HEADROOM)" >> $(1))

$(if $(BOARD_USERDATAIMAGE_FILE_SYSTEM_TYPE),$(hide) echo "userdata_fs_type=$(BOARD_USERDATAIMAGE_FILE_SYSTEM_TYPE)" >> $(1))

$(if $(BOARD_USERDATAIMAGE_PARTITION_SIZE),$(hide) echo "userdata_size=$(BOARD_USERDATAIMAGE_PARTITION_SIZE)" >> $(1))

$(if $(BOARD_FLASH_LOGICAL_BLOCK_SIZE), $(hide) echo "flash_logical_block_size=$(BOARD_FLASH_LOGICAL_BLOCK_SIZE)" >> $(1))

core/product.mk

+1 −0
Original line number Diff line number Diff line
@@ -131,6 +131,7 @@ _product_var_list := \ 
    VENDOR_EXCEPTION_PATHS \

    PRODUCT_ART_USE_READ_BARRIER \

    PRODUCT_IOT \

    PRODUCT_SYSTEM_HEADROOM \

core/product_config.mk

+4 −0
Original line number Diff line number Diff line
@@ -429,3 +429,7 @@ PRODUCT_IOT := \ 
# Package list to apply enforcing RRO.

PRODUCT_ENFORCE_RRO_TARGETS := \

    $(strip $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_ENFORCE_RRO_TARGETS))



# Add reserved headroom to a system image.

PRODUCT_SYSTEM_HEADROOM := \

    $(strip $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_SYSTEM_HEADROOM))

tools/releasetools/build_image.py

+18 −8
Original line number Diff line number Diff line
@@ -493,11 +493,11 @@ def BuildImage(in_dir, prop_dict, out_file, target_out=None): 
    shutil.rmtree(staging_system, ignore_errors=True)

    shutil.copytree(origin_in, staging_system, symlinks=True)



  reserved_blocks = prop_dict.get("has_ext4_reserved_blocks") == "true"

  has_reserved_blocks = prop_dict.get("has_ext4_reserved_blocks") == "true"

  ext4fs_output = None



  try:

    if reserved_blocks and fs_type.startswith("ext4"):

    if fs_type.startswith("ext4"):

      (ext4fs_output, exit_code) = RunCommand(build_command)

    else:

      (_, exit_code) = RunCommand(build_command)
@@ -518,7 +518,9 @@ def BuildImage(in_dir, prop_dict, out_file, target_out=None): 
  # not writable even with root privilege. It only affects devices using

  # file-based OTA and a kernel version of 3.10 or greater (currently just

  # sprout).

  if reserved_blocks and fs_type.startswith("ext4"):

  # Separately, check if there's enough headroom space available. This is useful for

  # devices with low disk space that have system image variation between builds.

  if (has_reserved_blocks or "partition_headroom" in prop_dict) and fs_type.startswith("ext4"):

    assert ext4fs_output is not None

    ext4fs_stats = re.compile(

        r'Created filesystem with .* (?P<used_blocks>[0-9]+)/'
@@ -526,14 +528,21 @@ def BuildImage(in_dir, prop_dict, out_file, target_out=None): 
    m = ext4fs_stats.match(ext4fs_output.strip().split('\n')[-1])

    used_blocks = int(m.groupdict().get('used_blocks'))

    total_blocks = int(m.groupdict().get('total_blocks'))

    reserved_blocks = 0

    headroom_blocks = 0

    adjusted_blocks = total_blocks

    if has_reserved_blocks:

      reserved_blocks = min(4096, int(total_blocks * 0.02))

    adjusted_blocks = total_blocks - reserved_blocks

      adjusted_blocks -= reserved_blocks

    if "partition_headroom" in prop_dict:

      headroom_blocks = int(prop_dict.get('partition_headroom')) / BLOCK_SIZE

      adjusted_blocks -= headroom_blocks

    if used_blocks > adjusted_blocks:

      mount_point = prop_dict.get("mount_point")

      print("Error: Not enough room on %s (total: %d blocks, used: %d blocks, "

            "reserved: %d blocks, available: %d blocks)" % (

            "reserved: %d blocks, headroom: %d blocks, available: %d blocks)" % (

                mount_point, total_blocks, used_blocks, reserved_blocks,

                adjusted_blocks))

                headroom_blocks, adjusted_blocks))

      return False



  if not fs_spans_partition:
@@ -614,9 +623,10 @@ def ImagePropFromGlobalDict(glob_dict, mount_point): 
  d["mount_point"] = mount_point

  if mount_point == "system":

    copy_prop("fs_type", "fs_type")

    # Copy the generic sysetem fs type first, override with specific one if

    # Copy the generic system fs type first, override with specific one if

    # available.

    copy_prop("system_fs_type", "fs_type")

    copy_prop("system_headroom", "partition_headroom")

    copy_prop("system_size", "partition_size")

    copy_prop("system_journal_size", "journal_size")

    copy_prop("system_verity_block_device", "verity_block_device")