From: David Unric <lists@...>
Date: 2012-09-08T04:36:06+09:00
Subject: Re: How to patch ruby's gem before an install ?

Eric Hodel wrote in post #1075073:
> On Sep 7, 2012, at 10:21 AM, Bartosz Dziewoński <matma.rex@gmail.com>
> wrote:
>> 2012/9/7 David Unric <lists@ruby-forum.com>:
>>> 4. ??? how to rebuild a gem from modified sources ? I cann't find the
>>> original gemspec.
>>
>> Doesn't `gem build` work for you?
>
>   gem unpack --spec

I did missed this option. THAT's the answer. Thank you.

> Will retrieve the original gem spec from the gem.  If you've added new
> files you will need to update the gemspec.
>
> Move this file into the unpacked gem directory then run `gem build`
>
>>> 5. ??? install modified gem with gem install ./gosu-0.7.45.gem
>>
>> `gem install gosu --local`.
>>
>>
>> Also, .gem files are just ZIP archives, you can unpack them with any
>> archiver and modify the contents.
>
> .gem files are tar files which contain (at least) a gzipped YAML file
> (metadata.gz, the gem spec) and a data.tar.gz (A gzipped tar file).
> Tools that only handle zip will not unpack them.

Correct. In addition all files stored in gem (tar) archive and 
subarchive data.tar.gz have time set to 1.1.1970.

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