Fix syschdemd exit code (#140)

* use systemd-run instead of machinectl

* fix systemd user sessions by launching through runuser

* fix: add which to path

modules/wsl-distro.nix

@@ -117,6 +117,9 @@ with lib; {
             enableEmergencyMode = false;
           };
 
+          # Start a systemd user session when starting a command through runuser
+          security.pam.services.runuser.startSession = true;
+
           warnings = (optional (config.systemd.services.systemd-resolved.enable && config.wsl.wslConf.network.generateResolvConf)
             "systemd-resolved is enabled, but resolv.conf is managed by WSL"
           );

scripts/syschdemd.nix

@@ -7,6 +7,7 @@
 , gnugrep
 , systemd
 , util-linux
+, which
 , defaultUser
 , automountPath
 ,
@@ -44,10 +45,10 @@ mkWrappedScript {
     glibc # getent
     gnugrep
     systemd # machinectl
-    util-linux # nsenter
+    util-linux # nsenter, runuser
+    which
     wrapper
   ];
   username = defaultUser.name;
-  uid = defaultUser.uid;
   inherit automountPath;
 }

scripts/syschdemd.sh

@@ -106,7 +106,7 @@ main() {
     shift
     command="$*"
   else
-    command=$(get_shell @username@)
+    command="$(get_shell @username@)"
   fi
 
   # If we're executed from inside the container, e.g. sudo
@@ -124,13 +124,17 @@ main() {
   exportCmd="$(export -p | grep -vE ' (HOME|LOGNAME|SHELL|USER)=')"
 
   run_in_namespace \
-    machinectl \
+    systemd-run \
     --quiet \
-    --uid=@uid@ \
+    --collect \
+    --wait \
+    --pty \
+    --service-type=exec \
     --setenv=INSIDE_NAMESPACE=true \
     --setenv=WSLPATH="$(clean_wslpath)" \
-    shell .host \
-    /bin/sh -c "cd \"$PWD\"; $exportCmd; source /etc/set-environment; exec $command"
+    --working-directory="$PWD" \
+    --machine=.host \
+    "$(which runuser)" -u @username@ -- /bin/sh -c "$exportCmd; source /etc/set-environment; exec $command"
 }
 
 main "$@"