84 lines
2.7 KiB
Nix
84 lines
2.7 KiB
Nix
# Builds an ext2 image containing a populated /nix/store with the closure
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# of store paths passed in the storePaths parameter, in addition to the
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# contents of a directory that can be populated with commands. The
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# generated image is sized to only fit its contents, with the expectation
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# that a script resizes the filesystem at boot time.
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{ pkgs
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, lib
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# List of derivations to be included
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, storePaths
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# Shell commands to populate the ./files directory.
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# All files in that directory are copied to the root of the FS.
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, populateImageCommands ? ""
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, volumeLabel
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, uuid ? "44444444-4444-4444-8888-888888888888"
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, e2fsprogs
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, libfaketime
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, perl
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, fakeroot
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, qemu
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}:
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let
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sdClosureInfo = pkgs.buildPackages.closureInfo { rootPaths = storePaths; };
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in
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pkgs.stdenv.mkDerivation {
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name = "ext2-fs.qcow2";
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nativeBuildInputs = [ e2fsprogs.bin libfaketime perl fakeroot qemu ];
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buildCommand =
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''
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img=temp.raw
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(
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mkdir -p ./files
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${populateImageCommands}
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)
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echo "Preparing store paths for image..."
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# Create nix/store before copying path
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mkdir -p ./rootImage/nix/store
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xargs -I % cp -a --reflink=auto % -t ./rootImage/nix/store/ < ${sdClosureInfo}/store-paths
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(
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GLOBIGNORE=".:.."
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shopt -u dotglob
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for f in ./files/*; do
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cp -a --reflink=auto -t ./rootImage/ "$f"
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done
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)
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# Also include a manifest of the closures in a format suitable for nix-store --load-db
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cp ${sdClosureInfo}/registration ./rootImage/nix-path-registration
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# Make a crude approximation of the size of the target image.
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# If the script starts failing, increase the fudge factors here.
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numInodes=$(find ./rootImage | wc -l)
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numDataBlocks=$(du -s -c -B 4096 --apparent-size ./rootImage | tail -1 | awk '{ print int($1 * 1.10) }')
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bytes=$((2 * 4096 * $numInodes + 4096 * $numDataBlocks))
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echo "Creating an EXT2 image of $bytes bytes (numInodes=$numInodes, numDataBlocks=$numDataBlocks)"
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truncate -s $bytes $img
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faketime -f "1970-01-01 00:00:01" fakeroot mkfs.ext2 -L ${volumeLabel} -U ${uuid} -d ./rootImage $img
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export EXT2FS_NO_MTAB_OK=yes
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# I have ended up with corrupted images sometimes, I suspect that happens when the build machine's disk gets full during the build.
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if ! fsck.ext2 -n -f $img; then
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echo "--- Fsck failed for EXT2 image of $bytes bytes (numInodes=$numInodes, numDataBlocks=$numDataBlocks) ---"
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cat errorlog
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return 1
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fi
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echo "Resizing to minimum allowed size"
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resize2fs -M $img
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# And a final fsck, because of the previous truncating.
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fsck.ext2 -n -f $img
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qemu-img convert $img $out
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'';
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}
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