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sd-image: Pull less slack in the image by accounting for slack

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The slack, seemingly, accounted for more than the minimum required for
slack plus the two partitions.

This change makes the gap a somewhat abstracted amount, but is not
configurable within the derivation.
This commit is contained in:
Samuel Dionne-Riel 2019-06-04 21:33:09 -04:00
parent 1843e00146
commit c113c094cf
1 changed files with 7 additions and 4 deletions
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11
nixos/modules/installer/cd-dvd/sd-image.nix
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@ -125,10 +125,13 @@ in
echo "${pkgs.stdenv.buildPlatform.system}" > $out/nix-support/system
echo "file sd-image $img" >> $out/nix-support/hydra-build-products
# Create the image file sized to fit /boot/firmware and /, plus 20M of slack
# Gap in front of the first partition, in MiB
gap=8
# Create the image file sized to fit /boot/firmware and /, plus slack for the gap.
rootSizeBlocks=$(du -B 512 --apparent-size ${rootfsImage} | awk '{ print $1 }')
firmwareSizeBlocks=$((${toString config.sdImage.firmwareSize} * 1024 * 1024 / 512))
imageSize=$((rootSizeBlocks * 512 + firmwareSizeBlocks * 512 + 20 * 1024 * 1024))
imageSize=$((rootSizeBlocks * 512 + firmwareSizeBlocks * 512 + gap * 1024 * 1024))
truncate -s $imageSize $img
# type=b is 'W95 FAT32', type=83 is 'Linux'.
@ -138,8 +141,8 @@ in
label: dos
label-id: ${config.sdImage.firmwarePartitionID}
start=8M, size=$firmwareSizeBlocks, type=b
start=${toString (8 + config.sdImage.firmwareSize)}M, type=83, bootable
start=''${gap}M, size=$firmwareSizeBlocks, type=b
start=$((gap + ${toString config.sdImage.firmwareSize}))M, type=83, bootable
EOF
# Copy the rootfs into the SD image