Update dht22 sensing code + sispmctl fixes

roles/pi-sispmctl/tasks/main.yml

@@ -1,15 +1,15 @@
 ---
-
+- name: Check if sispmctl already exists
+  stat: path=/usr/local/bin/sispmctl
+  register: sispmctl_file
 - name: Install dependencies
-  apt: name=libusb-dev cache_valid_time=7200 state=present
+  apt: name="libusb-dev" cache_valid_time=7200 state=present
 - name: Copy sispmctl sources
-  unarchive:
-    src: sispmctl-4.7.tar.gz
-    dest: /tmp
-  creates: /usr/local/bin/sispmctl    
+  unarchive: src=sispmctl-4.7.tar.gz dest=/tmp
+  when: sispmctl_file.stat.exists == false
 - name: Build and install
-  command: cd /tmp/sispmctl*/ && ./configure && make install
-  creates: /usr/local/bin/sispmctl
+  shell: cd /tmp/sispmctl*/ && ./configure --prefix=/usr && make install
+  when: sispmctl_file.stat.exists == false
 - name: Install systemd service file
   copy: src=sispmctl.service dest=/lib/systemd/system/
 - name: Add script to autostart and start now