ADD: Check that restic has been installed (#16)

* ADD: Check that restic has been installed

* FIX: lint

* Update CHANGELOG.md

* FIX: multiline

CHANGELOG.md

@@ -4,6 +4,9 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 and [human-readable changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## Unreleased
+### Added
+* Sanity check for restic binary
+
 ## [0.2.7] 2020-08-05
 ### Added
 * Config option to exclude files

tasks/install.yml

@@ -21,6 +21,24 @@
     owner: '{{ restic_dir_owner }}'
     group: '{{ restic_dir_group }}'
 
+- name: Test the binary
+  shell: "{{ restic_bin_bath }} version"
+  ignore_errors: true
+  register: restic_test_result
+
+- name: Remove faulty binary
+  file:
+    path: '{{ restic_bin_bath }}'
+    state: absent
+  when: "'FAILED' in restic_test_result.stderr"
+
+- name: Fail if restic could not be installed
+  fail:
+    msg: >-
+      Restic binary has been faulty and has been removed.
+      Try to re-run the role and make sure you have bzip2 installed!
+  when: "'FAILED' in restic_test_result.stderr"
+
 - name: Create symbolic link to the correct version
   file:
     src: '{{ restic_download_path }}/bin/restic-{{ restic_version }}'