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make-ext4-fs: Allows populating with custom files
This will allow adding /boot files to the rootfs.
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@ -1,9 +1,14 @@
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# Builds an ext4 image containing a populated /nix/store with the closure
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# of store paths passed in the storePaths parameter. The generated image
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# is sized to only fit its contents, with the expectation that a script
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# resizes the filesystem at boot time.
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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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# 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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@ -23,13 +28,17 @@ pkgs.stdenv.mkDerivation {
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buildCommand =
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''
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(
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mkdir -p ./files
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${populateImageCommands}
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)
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# Add the closures of the top-level store objects.
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storePaths=$(cat ${sdClosureInfo}/store-paths)
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# Make a crude approximation of the size of the target image.
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# If the script starts failing, increase the fudge factors here.
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numInodes=$(find $storePaths | wc -l)
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numDataBlocks=$(du -c -B 4096 --apparent-size $storePaths | awk '$2 == "total" { print int($1 * 1.03) }')
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numInodes=$(find $storePaths ./files | wc -l)
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numDataBlocks=$(du -s -c -B 4096 --apparent-size $storePaths ./files | tail -1 | awk '{ print int($1 * 1.03) }')
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bytes=$((2 * 4096 * $numInodes + 4096 * $numDataBlocks))
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echo "Creating an EXT4 image of $bytes bytes (numInodes=$numInodes, numDataBlocks=$numDataBlocks)"
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@ -47,6 +56,12 @@ pkgs.stdenv.mkDerivation {
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echo "copying store paths to image..."
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cptofs -t ext4 -i $out $storePaths /nix/store/
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(
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echo "copying files to image..."
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cd ./files
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cptofs -t ext4 -i $out ./* /
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)
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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.ext4 -n -f $out; then
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echo "--- Fsck failed for EXT4 image of $bytes bytes (numInodes=$numInodes, numDataBlocks=$numDataBlocks) ---"
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