gracefully check is already bootstrapped and pip is installed

tasks/main.yml

@@ -1,31 +1,38 @@
 - name: Check if bootstrap is needed
-  raw: stat $HOME/.bootstrapped
+  raw: test -e $HOME/.bootstrapped || echo -n need_bootstrap
   register: need_bootstrap
-  ignore_errors: True
+  changed_when: false
+
+- name: Booleanize need_bootstrap
+  set_fact:
+    need_bootstrap={{need_bootstrap.stdout == "need_bootstrap"}}
 
 - name: Run bootstrap.sh
   script: bootstrap.sh
-  when: need_bootstrap | failed
+  when: need_bootstrap
 
 - name: Check if we need to install pip
-  shell: "{{ansible_python_interpreter}} -m pip --version"
+  shell: "{{ansible_python_interpreter}} -c 'import pkgutil; print(pkgutil.find_loader(\"pip\") is None)'"
   register: need_pip
-  ignore_errors: True
   changed_when: false
-  when: need_bootstrap | failed
+  when: need_bootstrap
+
+- name: Booleanize need_pip
+  set_fact:
+    need_pip={{need_bootstrap and need_pip.stdout == "True"}}
 
 - name: Copy get-pip.py
   copy: src=get-pip.py dest=~/get-pip.py
-  when: need_pip | failed
+  when: need_pip
 
 - name: Install pip
   shell: "{{ansible_python_interpreter}} ~/get-pip.py"
-  when: need_pip | failed
+  when: need_pip
 
 - name: Remove get-pip.py
   file: path=~/get-pip.py state=absent
-  when: need_pip | failed
+  when: need_pip
 
 - name: Install pip launcher
   copy: src=runner dest=~/bin/pip mode=0755
-  when: need_pip | failed
+  when: need_pip