add karma role

roles/karma/defaults/main.yaml

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+---
+karma_go_arch_map:
+  i386: '386'
+  x86_64: 'amd64'
+
+karma_go_arch: "{{ karma_go_arch_map[ansible_architecture] | default('amd64') }}"
+
+karma_service_name: karma.service
+karma_service_enabled: true
+karma_service_state: started
+
+karma_version_regex: ^(.+)
+
+karma_github_project_url: https://github.com/prymitive/karma
+karma_release_file: "karma-{{ ansible_system | lower }}-{{ karma_go_arch }}.tar.gz"
+karma_release_url: "{{ karma_github_project_url }}/releases/download/v{{ karma_version }}/{{ karma_release_file }}"
+karma_checksum_url: "{{ karma_github_project_url }}/releases/download/v{{ karma_version }}/sha512sum.txt"
+karma_download_path: "/tmp/{{ karma_release_file }}"
+karma_unarchive_dest_path: /tmp
+karma_extracted_path: "{{ karma_download_path | replace('.tar.gz', '') }}"
+
+karma_user: karma
+karma_user_state: present
+karma_user_shell: /usr/sbin/nologin
+
+karma_group: karma
+karma_group_state: "{{ karma_user_state | default('present') }}"
+
+karma_etc_path: /etc/karma
+karma_etc_owner: root
+karma_etc_group: root
+karma_etc_mode: "0755"
+
+karma_config_path: "{{ karma_etc_path }}/karma.yml"
+
+karma_var_path: /var/lib/karma
+karma_var_owner: "{{ karma_user }}"
+karma_var_group: "{{ karma_group }}"
+karma_var_mode: "0755"
+
+karma_bin_path: /usr/local/bin
+
+karma_port: 8080
+
+karma_config: {}

roles/karma/handlers/main.yaml

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+---
+- name: restart karma
+  systemd:
+    name: karma.service
+    daemon_reload: true
+    state: restarted

roles/karma/tasks/configure.yaml

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+---
+- name: create group
+  group:
+    name: "{{ karma_group }}"
+    system: true
+    state: "{{ karma_group_state | default('present') }}"
+
+- name: create user
+  user:
+    name: "{{ karma_user }}"
+    system: true
+    shell: "{{ karma_user_shell }}"
+    group: "{{ karma_group }}"
+    createhome: false
+    home: "{{ karma_var_path }}"
+    state: "{{ karma_user_state | default('present') }}"
+
+- name: create etc path
+  file:
+    path: "{{ karma_etc_path }}"
+    state: directory
+    owner: "{{ karma_etc_owner }}"
+    group: "{{ karma_etc_group }}"
+    mode: "{{ karma_etc_mode }}"
+
+- name: create var path
+  file:
+    path: "{{ karma_var_path }}"
+    state: directory
+    owner: "{{ karma_var_owner }}"
+    group: "{{ karma_var_group }}"
+    mode: "{{ karma_var_mode }}"
+
+- name: configure
+  copy:
+    dest: "{{ karma_config_path }}"
+    content: "{{ (karma_config | default({})) | to_nice_yaml }}"
+    owner: root
+    group: root
+    mode: 0444
+  notify: restart karma
+
+- name: configure systemd template
+  template:
+    src: karma.service.j2
+    dest: /etc/systemd/system/karma.service
+    owner: root
+    group: root
+    mode: 0444
+  notify: restart karma
+
+- name: manage service
+  service:
+    name: "{{ karma_service_name }}"
+    enabled: "{{ karma_service_enabled }}"
+    state: "{{ karma_service_state }}"

roles/karma/tasks/install.yaml

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+---
+- block:
+  - name: download tar
+    get_url:
+      url: "{{ karma_release_url }}"
+      dest: "{{ karma_download_path }}"
+      checksum: "{{ karma_checksum }}"
+    register: dl
+    until: dl is success
+    retries: 5
+    delay: 10
+
+  - name: extract tar
+    unarchive:
+      src: "{{ karma_download_path }}"
+      dest: "{{ karma_unarchive_dest_path }}"
+      creates: "{{ karma_extracted_path }}"
+      remote_src: true
+
+  - name: install binaries
+    copy:
+      src: "{{ karma_extracted_path }}"
+      dest: "{{ karma_bin_path }}/karma"
+      owner: root
+      group: root
+      mode: 0755
+      remote_src: true
+    notify: restart karma
+  when: karma_version != karma_local_version

roles/karma/tasks/main.yaml

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+---
+- name: gather os specific variables
+  include_vars: "{{ lookup('first_found', possible_files) }}"
+  vars:
+    possible_files:
+      files:
+        - "{{ ansible_distribution }}-{{ ansible_distribution_version }}.yaml"
+        - "{{ ansible_distribution }}.yaml"
+        - "{{ ansible_os_family }}.yaml"
+        - "default.yaml"
+      paths:
+        - vars
+
+- name: include os specific tasks
+  include_tasks: "{{ lookup('first_found', possible_files) }}"
+  vars:
+    possible_files:
+      files:
+        - "{{ ansible_distribution }}-{{ ansible_distribution_version }}.yaml"
+        - "{{ ansible_distribution }}.yaml"
+        - "{{ ansible_os_family }}.yaml"
+        - "default.yaml"
+      paths:
+        - tasks
+
+- include: pre.yaml
+
+- include: install.yaml
+
+- include: configure.yaml

roles/karma/tasks/pre.yaml

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+---
+- name: determine if installed
+  stat:
+    path: "{{ karma_bin_path }}/karma"
+  register: st
+
+- name: set karma_installed
+  set_fact:
+    karma_installed: "{{ st.stat.exists | bool }}"
+
+- block:
+  - name: determine latest version
+    uri:
+      url: https://api.github.com/repos/prymitive/karma/releases/latest
+      return_content: true
+      body_format: json
+    register: _latest_version
+    until: _latest_version.status == 200
+    retries: 3
+
+  - name: set karma_version
+    set_fact:
+      karma_version: "{{ _latest_version.json['tag_name'] | regex_replace('^v', '') }}"
+
+- block:
+  - name: determine installed version
+    command: "{{ karma_bin_path }}/karma --version"
+    register: _installed_version_string
+    changed_when: false
+
+  - name: set karma_local_version
+    set_fact:
+      karma_local_version: "{{ _installed_version_string.stdout | regex_search(karma_version_regex, '\\1') | first }}"
+  when: karma_installed
+
+- name: set karma_local_version to 0
+  set_fact:
+    karma_local_version: "0"
+  when: not karma_installed
+
+- block:
+  - name: get checksums
+    set_fact:
+      _checksums: "{{ lookup('url', karma_checksum_url, wantlist=True) }}"
+
+  - name: set karma_checksum
+    set_fact:
+      karma_checksum: "sha512:{{ item.split(' ') | first }}"
+    loop: "{{ _checksums }}"
+    when: "karma_release_file in item"

roles/karma/templates/karma.service.j2

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+{{ ansible_managed | comment }}
+
+[Unit]
+Description=Karma Alertmanager dashboard
+Wants=network-online.target
+After=network-online.target
+After=alertmanager.service
+ 
+[Service]
+Type=simple
+User={{ karma_user }}
+Group={{ karma_group }}
+WorkingDirectory={{ karma_etc_path }}
+ExecStart={{ karma_bin_path }}/karma \
+    --config.file={{ karma_config_path }}
+ 
+[Install]
+WantedBy=multi-user.target