auto switch usb audio devices

playbook.yml

@@ -28,6 +28,7 @@
     - { role: development }
     - { role: backup }
     - { role: mapping }
+    - { role: sound }
   vars_prompt:
     - name: user_password
       prompt: "Enter desired user password"

roles/base/tasks/packages.yml

@@ -17,7 +17,6 @@
     - unrar
     - bc
     - ranger
-    - alsa-utils
 
 - name: Create AUR directory
   file: path=/home/{{ user.name }}/{{ aur.dir }}

roles/sound/files/udev.rules

@@ -0,0 +1,5 @@
+ Set USB device as default sound card when plugged in
+KERNEL=="pcmC[D0-9cp]*", ACTION=="add", PROGRAM="/bin/sh -c 'K=%k; K=$${K#pcmC}; K=$${K%%D*}; echo defaults.ctl.card $$K > /etc/asound.conf; echo defaults.pcm.card $$K >>/etc/asound.conf'"
+
+# Restore default sound card when USB device unplugged
+KERNEL=="pcmC[D0-9cp]*", ACTION=="remove", PROGRAM="/bin/sh -c 'echo defaults.ctl.card 0 > /etc/asound.conf; echo defaults.pcm.card 0 >>/etc/asound.conf'"

roles/sound/meta/main.yml

@@ -0,0 +1,3 @@
+---
+dependencies:
+  - { role: base }

roles/sound/tasks/main.yml

@@ -0,0 +1,6 @@
+---
+- name: Install alsa-utils
+  pacman: name=alsa-utils state=present
+
+- name: Copy udev rule for USB audio device switching
+  copy: src=udev.rules dest=/etc/udev/rules.d/00-local.rules