We usually don't want to bring the whole machine into emergency mode just because we couldn't mount envfs. It's usually not on the critical path.
61 lines
1.9 KiB
Nix
61 lines
1.9 KiB
Nix
{ pkgs, config, lib, ... }:
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let
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cfg = config.services.envfs;
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mounts = {
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"/usr/bin" = {
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device = "none";
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fsType = "envfs";
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options = [
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"fallback-path=${pkgs.runCommand "fallback-path" {} (''
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mkdir -p $out
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ln -s ${config.environment.usrbinenv} $out/env
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ln -s ${config.environment.binsh} $out/sh
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'' + cfg.extraFallbackPathCommands)}"
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"nofail"
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];
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};
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"/bin" = {
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device = "/usr/bin";
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fsType = "none";
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options = [ "bind" "nofail" ];
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};
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};
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in {
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options = {
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services.envfs = {
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enable = lib.mkEnableOption (lib.mdDoc "Envfs filesystem") // {
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description = lib.mdDoc ''
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Fuse filesystem that returns symlinks to executables based on the PATH
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of the requesting process. This is useful to execute shebangs on NixOS
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that assume hard coded locations in locations like /bin or /usr/bin
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etc.
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'';
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};
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package = lib.mkOption {
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type = lib.types.package;
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default = pkgs.envfs;
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defaultText = lib.literalExpression "pkgs.envfs";
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description = lib.mdDoc "Which package to use for the envfs.";
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};
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extraFallbackPathCommands = lib.mkOption {
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type = lib.types.lines;
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default = "";
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example = "ln -s $''{pkgs.bash}/bin/bash $out/bash";
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description = lib.mdDoc "Extra commands to run in the package that contains fallback executables in case not other executable is found";
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};
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};
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};
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config = lib.mkIf (cfg.enable) {
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environment.systemPackages = [ cfg.package ];
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# we also want these mounts in virtual machines.
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fileSystems = if config.virtualisation ? qemu then lib.mkVMOverride mounts else mounts;
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# We no longer need those when using envfs
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system.activationScripts.usrbinenv = lib.mkForce "";
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system.activationScripts.binsh = lib.mkForce "";
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};
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}
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