[tor-bugs] #27265 [Applications/rbm]: In some cases, rbm will download files in the wrong project directory

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#27265: In some cases, rbm will download files in the wrong project directory
---------------------------+-----------------------------------------------
     Reporter:  boklm      |      Owner:  boklm
         Type:  defect     |     Status:  new
     Priority:  Medium     |  Milestone:
    Component:             |    Version:
  Applications/rbm         |
     Severity:  Normal     |   Keywords:  boklm201808, TorBrowserTeam201808
Actual Points:             |  Parent ID:
       Points:             |   Reviewer:
      Sponsor:             |
---------------------------+-----------------------------------------------
 The patch for #27045 is causing an error when starting the build with an
 empty `out/` directory:
 https://trac.torproject.org/projects/tor/ticket/27045#comment:11

 We can see in the logs that binutils is being downloaded in the
 `out/firefox` directory instead of `out/binutils`:
 {{{
 Saving to: '/media/ssd/Code/Tor/tor-browser-
 build/out/firefox/binutils-2.26.1.tar.bz2'
 }}}

 The reason is that we override `output_dir` when calling `build_pkg` in
 `input_files`:
 {{{
             } elsif ($input_file->{project} && $t->('project')) {
                 my $p = $t->('project');
                 print "Building project $p - $name\n";
                 my $run_save = $config->{run};
                 $config->{run} = { target => $input_file->{target} };
                 $config->{run}{target} //= $run_save->{target};
                 build_pkg($p, {%$options, origin_project => $project,
 %$input_file,
                         output_dir => $proj_out_dir});
                 $config->{run} = $run_save;
                 print "Finished build of project $p - $name\n";
             } else {
 }}}

 The reason why we don't see this error in normal builds and only see it
 with #27045 is that in #27045 we are changing the `tor-browser` filename
 to remove `c("var/build_id")` from it, removing the need to download
 dependencies to compute the filename. In normal builds the binutils
 tarball is already downloaded (in the correct directory) when we start the
 firefox build, so we are not hitting this issue.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27265>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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