[Bug 676308] Review Request: rubygem-net-scp - A pure Ruby implementation of the SCP client protocol

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https://bugzilla.redhat.com/show_bug.cgi?id=676308

--- Comment #4 from Mamoru Tasaka <mtasaka@xxxxxxxxxxxxxxxxxxx> 2011-03-17 07:41:02 EDT ---
For just for the last comment (will check the whole thing later,
please wait for a moment...)

(In reply to comment #3)
> (In reply to comment #1)
> > ! Directly installing gem archive into %buildroot
> >   - I always recommend to install gem archive once under %_builddir
> >     to make it sure that no additional files are generated or files
> >     are not modified after installation is done.
> >     * For example, some testsuites generate additional executables
> >       or log files or modify files, which frequently confuses %files 
> >       entry or leads to rpmbuild failure.
> > 
> >     And because of the same reason, it is recommended that %buildroot
> >     is touched only in %install section (i.e. executing %check under
> >     %buildroot is discouraged).
> 
> I agree with you if the gem has binary extension, but this is not the case.

First of all, I have already seen some cases in which even 
noarch gem based srpm
- produced binary rpms containing unneeded files (such as test.log or some
  additional temp files generated during %check section)
  * This usually happens when %files entry just contain %geminstdir/
- or case to fail to build due to such addtional unneeded files
  (if you write %files entry rather verbosely as we recommend, this
   can happen)
- or even generates arch-dependent files during %check (although the package
  itself can be noarch)

test.log or so may be generated even with arch-independent gem-based rpms
(and you can find that this is not specific to rubygem based pkgs).
We have to make sure that %buildroot is not polluted during %check section.
So
- preparing everything before %install
- and generally %install is actually only for %install
- %check section uses %_builddir, not %buildroot
is the easiest way for ensuring this. 

> Unfortunately your statement is double-edged sword. You want to ensure that the
> test suite you are executing is testing the gem, you are going to install to
> our users. However, during install phase, there are typically done some changes
> in folder structure, some adjustments in path etc.
- So if some "large" structure change or so is needed on %install,
  it must be moved to %build, actually.

> If this is true, then
> executing of test suite in build folders is worthless, because it does not
> ensure anything. There might be bugs introduces by the install step.
- So see above. If such "large" change is needed on %install, it
  must be done in %build. Basically %install is for install (as the string
  says).


> On the other hand, you can done the restructuring also during build phase, but
> then, what is the purpose of the install section? Just copy the already
> prepared folder structure? There is no point.
- But this is not specific to rubygem based pkgs and we usually do so
  (i.e. %install is only for installation, i.e. install or cp commands). 
  Generally what is needed before installation should be done before
  %install. For autotools based pkgs,
  we
  - basically just unpack tarball on %prep (tar xf foo.tar.bz2)
  - do everything needed before installation at %build (configure -> make
    -> some other stuffs)
  - then in %install, basically just do "make install".
  - in %check, we usually actually do check under %_builddir

  So actually we want to follow this structure also when using rubygem, like
  - in %prep, just unpack gem
  - in %build, modify or create everything needed
  - then in %install, just install the needed files

  The problem is that we have no idea how to do this (gem install does
  what we usually do on %prep and %build). However anyway not installing
  files under %buildroot directly is preferred because of the reason I said
  above.

* Note that as you know, arch-dependent gem cannot be installed under
  %buildroot directly due to generating debuginfo rpm issue.

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