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Rake executes file task when prerequisites have older timestamp #246
Description
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
Activity
grzuy commentedon Feb 7, 2018
I can reproduce the same issue.
Working on a fix for this.
Revert "Merge pull request ruby#183 from aycabta/file-dryrun-bug-92"
grzuy commentedon Feb 21, 2018
There's an opened PR attempting to fix this #251
Don't run file tasks needlessly. Fixes ruby#246
grzuy commentedon Feb 22, 2018
Second attempt at fixing this one here #257
chrislo commentedon Jul 13, 2020
Was a fix for this bug ever merged? I've run into it today and it would be great if it could be fixed.
jgomo3 commentedon Jun 22, 2022
Maybe this is precisely the use case of Phony tasks: https://ruby.github.io/rake/doc/rakefile_rdoc.html#label-Phony+Task