When a file task depends on some non-file task indirectly,
Rake executes the file task even if its immediate prerequisite files have older timestamp.
It looks like the behavior changed at 12.1.0.
Example
require "rake/clean"
CLEAN.include("config.yml", "component")
task "setup" do
puts Rake::VERSION
touch "config.yml" unless File.exist?("config.yml")
end
file "config.yml" => "setup"
file "component" => "config.yml" do |t|
puts "[config.yml] #{File.mtime(t.prerequisites[0])}"
puts "[component] #{File.exist?(t.name) && File.mtime(t.name)}"
sleep 1
touch t.name
endBased on the above Rakefile, clean up and create the "component" first.
$ rake clean && rake component
The next rake component results in different behavior as follows.
On 12.0.0:
$ rake component --trace
(in /path/to/Rakefile-directory)
** Invoke component (first_time, not_needed)
** Invoke config.yml (first_time)
** Invoke setup (first_time)
** Execute setup
12.0.0
** Execute config.yml
On 12.1.0:
$ rake component --trace
(in /path/to/Rakefile-directory)
** Invoke component (first_time)
** Invoke config.yml (first_time)
** Invoke setup (first_time)
** Execute setup
12.1.0
** Execute config.yml
** Execute component
[config.yml] 2018-01-01 15:13:19 +0900
[component] 2018-01-01 15:13:20 +0900
touch component
When a file task depends on some non-file task indirectly,
Rake executes the file task even if its immediate prerequisite files have older timestamp.
It looks like the behavior changed at 12.1.0.
Example
Based on the above Rakefile, clean up and create the "component" first.
The next
rake componentresults in different behavior as follows.On 12.0.0:
On 12.1.0: