[X2Go-Dev] Bug#715: Bug#715: Proposed patch

[Mike Gabriel]

Hi Michael,

On  Mo 05 Jan 2015 14:29:18 CET, Michael DePaulo wrote:

> Hi Mike#1,
>
> On Mon, Jan 5, 2015 at 5:13 AM, Mike Gabriel
> <mike.gabriel at das-netzwerkteam.de> wrote:
>> Hi Michael,
>>
>>
>> On  Mo 05 Jan 2015 05:12:04 CET, Michael DePaulo wrote:
>>
>>> Tags: patch
>>>
>>> I would like someone who knows Perl better, such as theUser2, to
>>> review this patch.
>>>
>>> Although this is a very small patch, theUser2 advised me to be careful
>>> when creating full paths.
>>>
>>> I tested it successfully under CentOS 5 and CentOS 6.
>>>
>>> I intended to use "make_path" instead of "mkpath" if File::Path 2.06
>>> or later was detected. However, I could not figure out how to write a
>>> statement like "use File::Path( make_path)" if File::Path->VERSION is
>>> 2.06 or later. Specifically, it appears that "use" statements are
>>> executed at compile time in Perl, so they cannot be used within an if
>>> block. And I cannot just specify "use File::Path" for all versions of
>>> File::Path because "make_path" is not exported by default.
>>>
>>> EPEL 5:
>>> http://perldoc.perl.org/5.8.8/File/Path.html
>>>
>>> EPEL 6:
>>> http://perldoc.perl.org/5.10.1/File/Path.html
>>>
>>> Latest:
>>> http://perldoc.perl.org/File/Path.html
>>
>>
>> I recommend a more conditional approach testing the existence of the
>> make_path (and the mkpath) function during runtimed using the "defined"
>> command.
>>
>> See:
>> http://stackoverflow.com/questions/433752/how-can-i-determine-if-a-perl-function-exists-at-runtime
>>
>> Mike
> [...]
>
> I will follow that advice for runtime, but I still need to figure out
> what to do at compile time.
>
> http://perldoc.perl.org/functions/use.html
> "Because use takes effect at compile time, it doesn't respect the
> ordinary flow control of the code being compiled. In particular,
> putting a use inside the false branch of a conditional doesn't prevent
> it from being processed."

Ah, ok.

Simply import (use) the complete File::Path package (use File::Path)  
and reference the make_path and the mkpath function under its full  
package+function name (i.e. "File::Path::make_path", e.g.).

Mike



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