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image_types_sparse: backport fix 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.

This change corresponds to upstream fb331cb62e

Signed-off-by: Sean Anderson <sean.anderson@seco.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: AshishKumar Mishra <emailaddress.ashish@gmail.com>
Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>
This commit is contained in:
Sean Anderson
2025-09-25 22:59:29 +05:30
committed by Gyorgy Sarvari
parent 033f224986
commit b414502a08
1 changed files with 10 additions and 2 deletions
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meta-oe/classes/image_types_sparse.bbclass
+10 -2
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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" \
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"