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88 lines
2.2 KiB
Nix
88 lines
2.2 KiB
Nix
# Ensures we can fit stuff in an ext4 image.
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{ pkgs ? import <nixpkgs> {} }:
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let
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inherit (pkgs) imageBuilder;
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makeNull = size: let
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filename = "null.img";
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filesystemType = "FAT32"; # meh, good enough
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in
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''
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mkdir -p $out
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dd if=/dev/zero of=./${toString size}.img bs=${toString size} count=1
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'';
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in
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with imageBuilder;
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{
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eight = fileSystem.makeExt4 {
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name = "eight";
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partitionID = "44444444-4444-4444-0000-000000000008";
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populateCommands = ''
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${makeNull (imageBuilder.size.MiB 8)}
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'';
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};
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eleven = fileSystem.makeExt4 {
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name = "eleven";
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partitionID = "44444444-4444-4444-0000-000000000011";
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populateCommands = ''
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${makeNull (imageBuilder.size.MiB 11)}
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'';
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};
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sixteen = fileSystem.makeExt4 {
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name = "sixteen";
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partitionID = "44444444-4444-4444-0000-000000000016";
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populateCommands = ''
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${makeNull (imageBuilder.size.MiB 16)}
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'';
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};
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one_twenty_eight = fileSystem.makeExt4 {
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name = "one_twenty_eight";
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partitionID = "44444444-4444-4444-0000-000000000128";
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populateCommands = ''
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${makeNull (imageBuilder.size.MiB 128)}
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'';
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};
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two_fifty_six = fileSystem.makeExt4 {
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name = "two_fifty_six";
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partitionID = "44444444-4444-4444-0000-000000000256";
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populateCommands = ''
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${makeNull (imageBuilder.size.MiB 256)}
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'';
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};
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five_twelve = fileSystem.makeExt4 {
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name = "five_twelve";
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partitionID = "44444444-4444-4444-0000-000000000512";
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populateCommands = ''
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${makeNull (imageBuilder.size.MiB 512)}
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'';
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};
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with_space = fileSystem.makeExt4 {
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name = "with_space";
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partitionID = "44444444-4444-4444-0000-000000000005";
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populateCommands = ''
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${makeNull (imageBuilder.size.MiB 5)}
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'';
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extraPadding = size.MiB 10;
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};
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# Fills 512 MiB (the downard slump in the high fudge factor) with 512 1MiB
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# files so we ensure the filesystem overhead is accounted for.
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multiple-files = fileSystem.makeExt4 {
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name = "multiple-files";
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partitionID = "44444444-4444-4444-0000-000000000512";
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populateCommands = ''
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for i in {1..512}; do
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dd if=/dev/zero of=./$i.img bs=${toString (imageBuilder.size.MiB 1)} count=1
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done
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'';
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};
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}
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