Make crontab command customizable (#677)

* Make crontab command customizable

* Add --crontab-command to README and update Changelog

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 * Modify wheneverize to allow for the creating of 'config' directory when not present
 
+* Add --crontab-command to whenever binary for overriding the crontab command. [Martin Grandrath]
+
 ### 0.9.7 / June 14, 2016
 
 * Restore compatibility with Capistrano v3; it has a bug which we have to work around [Ben Langfeld, Chris Gunther, Shohei Yamasaki]

README.md

@@ -34,9 +34,16 @@ This will simply show you your `schedule.rb` file converted to cron syntax. It d
 $ whenever --update-crontab
 ```
 
+Other commonly used options include:
+```sh
+$ whenever --user app # set a user as which to install the crontab
+$ whenever --load-file config/my_schedule.rb # set the schedule file
+$ whenever --crontab-command 'sudo crontab` # override the crontab command
+```
+
 You can list installed cron jobs using `crontab -l`.
 
-Run `whenever --help` for a complete list of options for selecting the schedule to use, setting variables in the schedule, selecting a user as which to install the crontab, etc.
+Run `whenever --help` for a complete list of options for selecting the schedule to use, setting variables in the schedule, etc.
 
 ### Example schedule.rb file
 

bin/whenever

@@ -35,6 +35,9 @@ OptionParser.new do |opts|
   opts.on('-r', '--roles [role1,role2]', 'Comma-separated list of server roles to generate cron jobs for') do |roles|
     options[:roles] = roles.split(',').map(&:to_sym) if roles
   end
+  opts.on('-x', '--crontab-command [command]', 'Default: crontab') do |crontab_command|
+    options[:crontab_command] = crontab_command if crontab_command
+  end
   opts.on('-v', '--version') { puts "Whenever v#{Whenever::VERSION}"; exit(0) }
 end.parse!
 

lib/whenever/command_line.rb

@@ -9,9 +9,10 @@ def self.execute(options={})
     def initialize(options={})
       @options = options
 
-      @options[:file]       ||= 'config/schedule.rb'
-      @options[:cut]        ||= 0
-      @options[:identifier] ||= default_identifier
+      @options[:crontab_command] ||= 'crontab'
+      @options[:file]            ||= 'config/schedule.rb'
+      @options[:cut]             ||= 0
+      @options[:identifier]      ||= default_identifier
 
       if !File.exist?(@options[:file]) && @options[:clear].nil?
         warn("[fail] Can't find file: #{@options[:file]}")
@@ -57,15 +58,16 @@ def whenever_cron
     def read_crontab
       return @current_crontab if @current_crontab
 
-      command = ['crontab -l']
+      command = [@options[:crontab_command]]
+      command << '-l'
       command << "-u #{@options[:user]}" if @options[:user]
 
       command_results  = %x[#{command.join(' ')} 2> /dev/null]
       @current_crontab = $?.exitstatus.zero? ? prepare(command_results) : ''
     end
 
     def write_crontab(contents)
-      command = ['crontab']
+      command = [@options[:crontab_command]]
       command << "-u #{@options[:user]}" if @options[:user]
       # Solaris/SmartOS cron does not support the - option to read from stdin.
       command << "-" unless OS.solaris?