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image_types_sparse: Pad source image to block size

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If the source image's size is not aligned to the sparse image's block
size, then conversion will fail with

img2simg: libsparse/sparse.cpp:133: int write_all_blocks(sparse_file*, output_file*): Assertion `pad >= 0' failed.

This is a bug in img2simg, but an easy way to work around it is to pad
the source image ourselves. The default block size of 4096 matches
img2simg's default block size.

Signed-off-by: Sean Anderson <sean.anderson@seco.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
This commit is contained in:
Sean Anderson 2022-08-12 15:44:03 -04:00 committed by Khem Raj
parent d2e903b5d6
commit fb331cb62e
1 changed files with 12 additions and 4 deletions
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16
meta-oe/classes/image_types_sparse.bbclass
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@ -1,8 +1,16 @@
inherit image_types
# This sets the granularity of the sparse image conversion. Chunk sizes will be
# specified in units of this value. Setting this value smaller than the
# underlying image's block size will not result in any further space saving.
# However, there is no loss in correctness if this value is larger or smaller
# than optimal. This value should be a power of two.
SPARSE_BLOCK_SIZE ??= "4096"
CONVERSIONTYPES += "sparse"
CONVERSION_CMD:sparse = " \
img2simg "${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.${type}" \
"${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.${type}.sparse" \
"
CONVERSION_CMD:sparse() {
INPUT="${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.${type}"
truncate --no-create --size=%${SPARSE_BLOCK_SIZE} "$INPUT"
img2simg "$INPUT" "$INPUT.sparse" ${SPARSE_BLOCK_SIZE}
}
CONVERSION_DEPENDS_sparse = "android-tools-native"