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fix build: sdimage

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Increase extra space to 20% to accomodate file system overhead.
Align image size to 1 MiB.

Signed-off-by: Ganga Ram <Ganga.Ram@tii.ae>
This commit is contained in:
Ganga Ram 2024-08-28 11:32:36 +04:00
parent 331fb15627
commit 0c848e9ef0
1 changed files with 9 additions and 1 deletions
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10
nixos/lib/make-ext4-fs.nix
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@ -58,10 +58,18 @@ pkgs.stdenv.mkDerivation {
# Make a crude approximation of the size of the target image.
# If the script starts failing, increase the fudge factors here.
numInodes=$(find ./rootImage | wc -l)
numDataBlocks=$(du -s -c -B 4096 --apparent-size ./rootImage | tail -1 | awk '{ print int($1 * 1.10) }')
numDataBlocks=$(du -s -c -B 4096 --apparent-size ./rootImage | tail -1 | awk '{ print int($1 * 1.20) }')
bytes=$((2 * 4096 * $numInodes + 4096 * $numDataBlocks))
echo "Creating an EXT4 image of $bytes bytes (numInodes=$numInodes, numDataBlocks=$numDataBlocks)"
mebibyte=$(( 1024 * 1024 ))
# Round up to the nearest mebibyte.
# This ensures whole 512 bytes sector sizes in the disk image
# and helps towards aligning partitions optimally.
if (( bytes % mebibyte )); then
bytes=$(( ( bytes / mebibyte + 1) * mebibyte ))
fi
truncate -s $bytes $img
faketime -f "1970-01-01 00:00:01" fakeroot mkfs.ext4 -L ${volumeLabel} -U ${uuid} -d ./rootImage $img