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Allign disk images to 4k blocks

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Albrecht Lohofener
2025-09-09 13:48:00 +02:00
parent 09c940f00f
commit a260e37ed9
1 changed files with 19 additions and 0 deletions
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@@ -123,6 +123,25 @@ RUN echo "Building for platform '$TARGETPLATFORM'" \
&& wget $OPENWRT_IMAGE -O /var/vm/squashfs-combined-${OPENWRT_VERSION}.img.gz \
&& gzip -d /var/vm/squashfs-combined-${OPENWRT_VERSION}.img.gz \
\
# 4k align the OpenWrt image so qemu doesn't complain about resize errors \
# Get current size in bytes \
&& size=$(stat -c%s "/var/vm/squashfs-combined-${OPENWRT_VERSION}.img") \
# ceil to MB \
&& size_mb=$(( (size + 1024*1024 - 1) / (1024*1024) )) \
&& echo "Current size: ${size_mb} MiB " \
# Decide target size \
&& if [ "$size_mb" -le 128 ]; then \
target_mb=128; \
elif [ "$size_mb" -le 256 ]; then \
target_mb=256; \
elif [ "$size_mb" -le 512 ]; then \
target_mb=512; \
elif [ "$size_mb" -le 1024 ]; then \
target_mb=1024; \
fi \
&& echo "Extending /var/vm/squashfs-combined-${OPENWRT_VERSION}.img to ${target_mb} MiB..." \
&& dd if=/dev/zero of="/var/vm/squashfs-combined-${OPENWRT_VERSION}.img" seek="${target_mb}" obs=1M count=0 \
\
# Each CPU architecture needs a different SSH port to make a possible to make a parallel build \
&& SSH_PORT=1022 \
\