sway: per-host overrides via host.conf and session-env

Adds a host_sway_dotfiles mechanism mirroring host_i3_dotfiles: hosts
drop a host.conf into ~/.config/sway/ to override sway settings, and
optionally a session-env file sourced by start-sway for per-host
environment variables. The base sway/config defines $terminal and
includes ~/.config/sway/host.conf; an empty placeholder ships with the
base profile so the include never warns on hosts without overrides.

nymph gets its own host.conf wrapping alacritty in prime-run (NVIDIA
PRIME offload), bumping gaps/corner_radius, and pinning workspaces to
eDP-1 / DP-1, plus a session-env exporting SWAY_UNSUPPORTED_GPU=1 and
WLR_DRM_DEVICES for the hybrid Intel+NVIDIA setup.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ansible/inventory/host_vars/nymph.yml

@@ -31,3 +31,11 @@ host_i3_dotfiles:
   - src: .config/wireplumber/wireplumber.conf.d/60-camera-priority.conf
     dest: .config/wireplumber/wireplumber.conf.d/60-camera-priority.conf
     mode: "0644"
+
+host_sway_dotfiles:
+  - src: .config/sway/host.conf
+    dest: .config/sway/host.conf
+    mode: "0644"
+  - src: .config/sway/session-env
+    dest: .config/sway/session-env
+    mode: "0644"

ansible/roles/profile_desktop_host/tasks/main.yml

@@ -19,3 +19,18 @@
     - "'i3' in (desktop_sessions_enabled | default([]))"
     - (host_i3_dotfiles | default([])) | length > 0
 
+- name: Copy host-specific sway dotfiles
+  tags: [dotfiles, dotfiles:desktop, dotfiles:host, sway]
+  ansible.builtin.copy:
+    src: "{{ playbook_dir }}/../dotfiles/{{ hostname }}/{{ item.src }}"
+    dest: "{{ user_home }}/{{ item.dest }}"
+    owner: "{{ username }}"
+    group: "{{ user_group }}"
+    mode: "{{ item.mode }}"
+  loop: "{{ host_sway_dotfiles | default([]) }}"
+  loop_control:
+    label: "{{ item.dest }}"
+  when:
+    - "'sway' in (desktop_sessions_enabled | default([]))"
+    - (host_sway_dotfiles | default([])) | length > 0
+

dotfiles/desktop/.config/sway/config

@@ -10,6 +10,9 @@ set $down j
 set $up k
 set $right l
 
+# Default terminal (hosts can override via host.conf — e.g. nymph wraps it in prime-run)
+set $terminal alacritty
+
 # Workspaces (waybar formatta i numeri in romani via format-icons)
 set $ws1  "1"
 set $ws2  "2"
@@ -62,6 +65,9 @@ gaps outer 4
 smart_gaps on
 smart_borders on
 
+# Per-host overrides (terminal wrapper, gaps tweaks, workspace→output bindings, …)
+include ~/.config/sway/host.conf
+
 # Window rules
 for_window [app_id="(?i)polkit"] floating enable
 for_window [class="(?i)polkit"] floating enable
@@ -108,7 +114,7 @@ exec swayidle -w \
     before-sleep '~/.config/sway/scripts/lockscreen'
 
 # Terminal
-bindsym $mod+Return exec alacritty
+bindsym $mod+Return exec $terminal
 
 # Emacs client
 bindsym $mod+Shift+e exec emacsclient -c -n

dotfiles/desktop/.config/sway/host.conf

@@ -0,0 +1,3 @@
+# Per-host sway overrides. Empty by default; hosts that need tuning
+# ship their own version via host_sway_dotfiles, which overwrites this
+# placeholder during deploy.

dotfiles/desktop/.local/bin/start-sway

@@ -15,6 +15,9 @@ export GDK_BACKEND='wayland,x11'
 
 export SSH_AUTH_SOCK="$HOME/.local/state/ssh-agent/socket"
 
+# Per-host session environment (GPU / Wayland tuning, etc.)
+[ -r "$HOME/.config/sway/session-env" ] && . "$HOME/.config/sway/session-env"
+
 exec dbus-run-session sh -eu -c '
   umask 077
   printf "%s\n" "$DBUS_SESSION_BUS_ADDRESS" > "$HOME/.dbus-session-bus-address"

dotfiles/nymph/.config/sway/host.conf

@@ -0,0 +1,16 @@
+set $terminal ~/.local/bin/prime-run /usr/bin/alacritty
+
+gaps inner 10
+gaps outer 5
+corner_radius 10
+
+workspace 1 output eDP-1
+workspace 2 output DP-1
+workspace 3 output DP-1
+workspace 4 output DP-1
+workspace 5 output DP-1
+workspace 6 output DP-1
+workspace 7 output DP-1
+workspace 8 output DP-1
+workspace 9 output DP-1
+workspace 10 output DP-1

dotfiles/nymph/.config/sway/session-env

@@ -0,0 +1,6 @@
+export LIBVA_DRIVER_NAME=iHD
+export QT_QPA_PLATFORM=wayland
+export QT_QPA_PLATFORMTHEME=qt6ct
+export SWAY_UNSUPPORTED_GPU=1
+export WLR_DRM_DEVICES=/dev/dri/card0:/dev/dri/card1
+export WLR_NO_HARDWARE_CURSORS=1