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make-btrfs-fs: start with 4G and auto-shrink

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This commit is contained in:
Linus Heckemann 2021-01-06 23:27:02 +01:00
parent 361c658230
commit c2f8b5d71f
1 changed files with 2 additions and 6 deletions
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8
make-btrfs-fs.nix
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@ -58,13 +58,9 @@ 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($1 * 1.10) }')
bytes=$((2 * 4096 * $numInodes + 4096 * $numDataBlocks))
echo "Creating a btrfs image of $bytes bytes (numInodes=$numInodes, numDataBlocks=$numDataBlocks)"
truncate -s $bytes $img
faketime -f "1970-01-01 00:00:01" fakeroot mkfs.btrfs -L ${volumeLabel} -U ${uuid} -r ./rootImage $img
truncate -s 4G $img
faketime -f "1970-01-01 00:00:01" fakeroot mkfs.btrfs --shrink -L ${volumeLabel} -U ${uuid} -r ./rootImage $img
if [ ${builtins.toString compressImage} ]; then
echo "Compressing image"