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| | # SPDX-License-Identifier: MIT
# SPDX-FileCopyrightText: 2022 Alyssa Ross <hi@alyssa.is>
{ pkgs ? import <nixpkgs> {}
# Paths that are present in the base image that will start this VM's
# run script, and don't so need to be duplicated in the extension
# partition's store.
, basePaths ? builtins.toFile "null" ""
}:
pkgs.pkgsStatic.callPackage (
{ lib, runCommand, writeReferencesToFile, e2fsprogs, tar2ext4 }:
{ run, providers ? {} }:
let
inherit (lib)
any attrValues concatLists concatStrings hasInfix mapAttrsToList;
in
assert !(any (hasInfix "\n") (concatLists (attrValues providers)));
runCommand "spectrum-vm" {
nativeBuildInputs = [ e2fsprogs tar2ext4 ];
providerDirs = concatStrings (concatLists
(mapAttrsToList (kind: map (vm: "${kind}/${vm}\n")) providers));
passAsFile = [ "providerDirs" ];
} ''
mkdir -p "$out"/{blk,providers}
mkdir root
cd root
ln -s ${run} run
comm -23 <(sort ${writeReferencesToFile run}) \
<(sort ${writeReferencesToFile basePaths}) |
tar -cf ../run.tar --verbatim-files-from -T - run
tar2ext4 -i ../run.tar -o "$out/blk/run.img"
e2label "$out/blk/run.img" ext
pushd "$out/providers"
xargs -rd '\n' dirname -- < "$providerDirsPath" | xargs -rd '\n' mkdir -p --
xargs -rd '\n' touch -- < "$providerDirsPath"
popd
ln -s /usr/img/appvm/blk/root.img "$out/blk"
ln -s /usr/img/appvm/vmlinux "$out"
''
) {}
|