[Rake-devel] Tracking some discrepancies on Windows

Luis Lavena luislavena at gmail.com
Fri Oct 24 01:52:44 EDT 2008

On Fri, Oct 24, 2008 at 12:00 AM, Assaf Arkin <assaf at labnotes.org> wrote:
> On Thu, Oct 23, 2008 at 10:40 AM, Luis Lavena <luislavena at gmail.com> wrote:
>> Hello everybody.
>> I'm just investing a bit fixing some issues I found with latest 0.8.3
>> release and are hitting me hard to maintain One-Click installer.
>> One of those is related to rake_system call and the "call" added, and
>> others are related to ruby and sh commands.
>> I forked the project and added some fixed in windows branch:
>> http://github.com/luislavena/rake/tree/windows
>> So using that as base, I found the following discrepancy:
>> http://pastie.org/299068
>> Keep in mind that this version of ruby (patchlevel 114) has been
>> patched to solve the $? existstatus issues found in previous versions
>> of Ruby for Windows.
>> http://blog.mmediasys.com/2008/05/24/random-bits-and-experiments/
>> Looking more closer, I believe Kernel::system with mutliple arguments is
>> broken.
>> ruby 1.8.6 (2008-03-03 patchlevel 114) [i686-linux]
>> irb(main):001:0> ENV['FOO'] = "hello"
>> => "hello"
>> irb(main):002:0> system "echo", "$FOO"
>> $FOO
>> => true
>> irb(main):003:0> system "echo $FOO"
>> hello
>> => true
> If you call system with a single argument, that argument goes through shell
> expansion (env variables, glob patterns, escaping, etc).  If you call with
> multiple arguments, the first one is the executable name, the rest are
> passed as command line arguments without shell expansion.  In other words,
> call system with multiple arguments if you want to bypass shell expansion.
> Assaf

Thank you for the clarification Assaf, the lack of documentation from
Ruby C code on this function made me doubt about it.

Now I can work on a pending patch dealing with extensionless commands
that should be expanded properly.

Luis Lavena
Human beings, who are almost unique in having the ability to learn from
the experience of others, are also remarkable for their apparent
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