Bug#1034147: ruby-regexp-parser: please make the build reproducible

[Chris Lamb]

Source: ruby-regexp-parser
Version: 2.6.1-1
Severity: wishlist
Tags: patch
User: reproducible-builds at lists.alioth.debian.org
Usertags: buildpath
X-Debbugs-Cc: reproducible-bugs at lists.alioth.debian.org

Hi,

Whilst working on the Reproducible Builds effort [0] we noticed that
ruby-regexp-parser could not be built reproducibly.

This is because it uses the ragel compiler that, by default, will add
line annotations that include the absolute build path:

  /usr/share/rubygems-integration/all/gems/regexp_parser-2.6.1/lib/regexp_parser/scanner.rb
  @@ -1,12 +1,12 @@
   # -*- warn-indent:false;  -*-

  -# line 1 "/build/1st/ruby-regexp-parser-2.6.1/tasks/../lib/regexp_parser/scanner/scanner.rl"
  +# line 1 "/build/2/ruby-regexp-parser-2.6.1/2nd/tasks/../lib/regexp_parser/scanner/scanner.rl"

(etc.)

A patch is attached that adjusts the call to ragel to include the -L
argument that suppresses these additions.

 [0] https://reproducible-builds.org/


Regards,

-- 
      ,''`.
     : :'  :     Chris Lamb
     `. `'`      lamby at debian.org / chris-lamb.co.uk
       `-
-------------- next part --------------
--- a/debian/patches/reproducible-build.patch	1970-01-01 01:00:00.000000000 +0100
--- b/debian/patches/reproducible-build.patch	2023-04-10 12:33:48.022769023 +0100
@@ -0,0 +1,15 @@
+Description: Make the build reproducible
+Author: Chris Lamb <lamby at debian.org>
+Last-Update: 2023-04-10
+
+--- ruby-regexp-parser-2.6.1.orig/tasks/ragel.rake
++++ ruby-regexp-parser-2.6.1/tasks/ragel.rake
+@@ -8,7 +8,7 @@ namespace :ragel do
+     RAGEL_SOURCE_FILES.each do |source_file|
+       output_file = "#{RAGEL_OUTPUT_DIR}/#{source_file}.rb"
+       # using faster flat table driven FSM, about 25% larger code, but about 30% faster
+-      sh "ragel -F1 -R #{RAGEL_SOURCE_DIR}/#{source_file}.rl -o #{output_file}"
++      sh "ragel -L -F1 -R #{RAGEL_SOURCE_DIR}/#{source_file}.rl -o #{output_file}"
+ 
+       contents = File.read(output_file)
+ 
--- a/debian/patches/series	1970-01-01 01:00:00.000000000 +0100
--- b/debian/patches/series	2023-04-10 12:33:46.366759334 +0100
@@ -0,0 +1 @@
+reproducible-build.patch