Merge pull request #79 from nzbr/mount-fix

Fix Windows File Systems not being mounted on first start when using the Installer

Author: nzbr

modules/installer.nix

@@ -54,7 +54,10 @@ with builtins; with lib; {
 
         contents = [
           { source = config.environment.etc."wsl.conf".source; target = "/etc/wsl.conf"; }
+          { source = config.environment.etc."fstab".source; target = "/etc/fstab"; }
           { source = passwd; target = "/etc/passwd"; }
+          { source = "${pkgs.busybox}/bin/busybox"; target = "/bin/sh"; }
+          { source = "${pkgs.busybox}/bin/busybox"; target = "/bin/mount"; }
         ];
       };
 

modules/wsl-distro.nix

@@ -47,7 +47,7 @@ with builtins; with lib;
   config =
     let
       cfg = config.wsl;
-      syschdemd = import ../syschdemd.nix { inherit lib pkgs config; defaultUser = cfg.defaultUser; };
+      syschdemd = import ../syschdemd.nix { inherit lib pkgs config; defaultUser = cfg.defaultUser; defaultUserHome = config.users.users.${cfg.defaultUser}.home; };
     in
     mkIf cfg.enable {
 

syschdemd.nix

@@ -1,4 +1,10 @@
-{ lib, pkgs, config, defaultUser, ... }:
+{ lib
+, pkgs
+, config
+, defaultUser
+, defaultUserHome ? "/home/${defaultUser}"
+, ...
+}:
 
 pkgs.substituteAll {
   name = "syschdemd";
@@ -8,8 +14,8 @@ pkgs.substituteAll {
 
   buildInputs = with pkgs; [ daemonize ];
 
+  inherit defaultUser defaultUserHome;
   inherit (pkgs) daemonize;
-  inherit defaultUser;
   inherit (config.security) wrapperDir;
   fsPackagesPath = lib.makeBinPath config.system.fsPackages;
 

syschdemd.sh

@@ -56,7 +56,7 @@ fi
 # Pass external environment but filter variables specific to root user.
 exportCmd="$(export -p | $sw/grep -vE ' (HOME|LOGNAME|SHELL|USER)='); export WSLPATH=\"$PATH\"; export INSIDE_NAMESPACE=true"
 
-if [ -z "${INSIDE_NAMESPACE:-}" ]; then
+if [[ -z "${INSIDE_NAMESPACE:-}" ]]; then
 
     # Test whether systemd is still alive if it was started previously
     if ! [ -d "/proc/$(</run/systemd.pid)" ]; then
@@ -65,6 +65,12 @@ if [ -z "${INSIDE_NAMESPACE:-}" ]; then
         start_systemd
     fi
 
+    # If we are currently in /root, this is probably because the directory that WSL was started is inaccessible
+    # cd to the user's home to prevent a warning about permission being denied on /root
+    if [[ $PWD == "/root" ]]; then
+        cd @defaultUserHome@
+    fi
+
     exec $sw/nsenter -t $(</run/systemd.pid) -p -m -- $sw/machinectl -q \
         --uid=@defaultUser@ shell .host /bin/sh -c \
         "cd \"$PWD\"; $exportCmd; source /etc/set-environment; exec $cmd"