65 lines
2.1 KiB
Nix
65 lines
2.1 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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"bind-mount=/bin"
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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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# We need to bind-mount /bin to /usr/bin, because otherwise upgrading
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# from envfs < 1.0.5 will cause having the old envs with no /bin bind mount.
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# Systemd is smart enough to not mount /bin if it's already mounted.
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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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