Fix failing on EPEL check in Fedora (#111)

* Fix failing on EPEL check in Fedora

Only applies when using the "package" install method.
Added a separate variable "borg_require_epel" to make it easy to disable
the check in any other situations (e.g. using a custom mirror instead of
the epel-release package).

* Explain default value of borg_require_epel

README.md

@@ -87,6 +87,7 @@ $ git clone https://github.com/borgbase/ansible-role-borgbackup.git roles/ansibl
 - `borg_exclude_from`: Read exclude patterns from one or more separate named files, one pattern per line.
 - `borg_exclude_patterns`: Paths or patterns to exclude from backup. See [official documentation](https://borgbackup.readthedocs.io/en/stable/usage/help.html#borg-help-patterns) for more.
 - `borg_install_method`: By default `pip` is used to install borgmatic. To install via your distributions package manager set this to `package` and (if needed) overwrite the `borg_distro_packages` variable to contain your distributions package names required to install borgmatic. Note that many distributions ship outdated versions of borgbackup and borgmatic; use at your own risk.
+- `borg_require_epel`: When using `borg_install_method: package` on RHEL-based distributions, the EPEL repo is required. To disable the check (e.g. when using a custom mirror instead of the `epel-release` package), set this to `false`. Defaults to `{{ ansible_os_family == 'RedHat' and ansible_distribution != 'Fedora' }}` (i.e. `true` on Enterprise Linux-based distros).
 - `borg_lock_wait_time`: Config maximum seconds to wait for acquiring a repository/cache lock. Defaults to 5 seconds.
 - `borg_one_file_system`: Don't cross file-system boundaries. Defaults to `true`
 - `borg_pip_packages`: Dependancy Packages (pip) to install `borg(backup)` and `borgmatic`.

defaults/main.yml

@@ -22,6 +22,7 @@ borgmatic_timer: cron
 borgmatic_timer_hour: "{{ range(0, 5) | random(seed=inventory_hostname) }}"
 borgmatic_timer_minute: "{{ range(0, 59) | random(seed=inventory_hostname) }}"
 borg_install_method: "pip"
+borg_require_epel: "{{ ansible_os_family == 'RedHat' and ansible_distribution != 'Fedora' }}"
 
 borgmatic_config_name: config.yaml
 borgmatic_hooks:

tasks/noauto_install_package.yml

@@ -2,7 +2,7 @@
 - name: Install borgbackup by distro
   block:
     - name: Check if EPEL repo is enabled, if installation from distro is requested
-      when: ansible_os_family == 'RedHat'
+      when: borg_require_epel
       block:
       - name: Get list of installed packages
         ansible.builtin.package_facts: