[DRE-maint] Bug#981173: gem2deb: FTBFS on ia64, can't find gem rake with executable rake

[Antonio Terceiro]

Control: tag -1 + wontfix

Hello Laurent,

On Wed, Jan 27, 2021 at 10:34:24AM +0100, Laurent Bigonville wrote:
> Source: gem2deb
> Version: 1.2.1
> Severity: important
> Tags: ftbfs
> Justification: fails to build from source (but built successfully in the past)
> 
> Hello,
> 
> It looks like that gem2deb FTBFS on ia64 since version 1.2.1:
> 
>    debian/rules override_dh_auto_build
> make[1]: Entering directory '/<<PKGBUILDDIR>>'
> # NO_PKG_MANGLE=1 only useful on Ubuntu buildds, to disable pkgbinarymangler
> NO_PKG_MANGLE=1 ruby2.5 -S rake test:unit TESTOPTS=-v
> /usr/lib/ruby/2.5.0/rubygems.rb:284:in `find_spec_for_exe': can't find gem rake (>= 0.a) with executable rake (Gem::GemNotFoundException)
>         from /usr/lib/ruby/2.5.0/rubygems.rb:303:in `activate_bin_path'
>         from /usr/bin/rake:23:in `<main>'
> make[1]: *** [debian/rules:22: ruby2.5] Error 1
> 
> Not sure what's happening here, the dependency seems installed

According to
https://buildd.debian.org/status/fetch.php?pkg=gem2deb&arch=ia64&ver=1.4&stamp=1611285462&raw=0
ia64 doesn't even have ruby2.7.

Then ruby-defaults was hacked (I see `ruby-all-dev ia64
1:2.7+3.is.2.5.7.1` in the logs) to still "work" with ruby2.5, while
Debian has moved on to ruby2.7 a long time ago.

The ia64 archive is stuck in a weird broken state which we cannot
support. If there really is someone who cares about ia64, then the first
step is fixing src:ruby2.7, then src:ruby-defaults.

There is nothing that can be done in gem2deb to fix this.
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