modules/steam: Add workarounds for OOBE

The steam updater will otherwise attempt to update even though there is
no network connection.

So we'll use approximately the vendor methods to decide what to do here.

modules/steam/steam.nix

@@ -18,6 +18,7 @@ let
     mangohud
     bubblewrap
     systemd
+    networkmanager
 
     jupiter-hw-support
     steamdeck-hw-theme
@@ -48,6 +49,7 @@ let
   sessionPath = makeBinPath [
     mangohud
     systemd
+    networkmanager
     steam
     steam.run
   ];
@@ -146,6 +148,34 @@ let
 
     set -e
 
+    # OOBE handling.
+    # (See steam-jupiter.sh in steam-jupiter-oobe and steam-jupiter-stable)
+    # On first boot, we need to start whatever steam we have packaged, to
+    # allow the user to connect to the internet. We don't have the luxury
+    # that Steam's OOBE has to be heavy-handed. So instead we'll see if it
+    # looks like the user has never started steam. If it looks that way,
+    # we'll init OOBE, and otherwise undo it.
+    (
+      STEAM_LINKS="$HOME"/.steam
+      STEAM_DIR="$HOME"/.local/share/Steam
+      REGISTRY="$STEAM_LINKS"/registry.vdf
+
+      echo ":: Checking if we're offline, or in OOBE..."
+      if ! test -f "$REGISTRY" || [[ "$(nmcli networking connectivity check)" != full ]]; then
+        echo "   We are!!"
+        echo "   Disabling the updater..."
+        mkdir -pv "$STEAM_DIR"
+        printf '# OOBE Inhibit\nBootStrapperInhibitAll = enable' \
+          > "$STEAM_DIR"/Steam.cfg
+      else
+        echo "   We are not"
+        if grep '^# OOBE Inhibit' "$STEAM_DIR"/Steam.cfg; then
+          echo "   Deleting our own OOBE config."
+          rm -v "$STEAM_DIR"/Steam.cfg
+        fi
+      fi
+    )
+
     steam -steamos3 -steampal -steamdeck -gamepadui "$@" &
     wait
   '';