[ruby-core:92398] [Ruby trunk Bug#15787] rubygems.rb on read-only volume

Issue #15787 has been updated by wishdev (John Higgins).


There is no such requirement as rubygems.rb in that folder being written to=
. I run locked down lxc containers on a daily basis that have no such writi=
ng ability (read only roots) and ruby works just fine. That folder is also =
not generally writeable on my systems for a standard user either even if th=
e root is not read only.

I'm also generally unaware (and I could be very wrong) but there is no "lis=
t" of installed gems anywhere that I can find.

I don't believe you are barking up the correct tree here.

The file you mention is required to be readable because it is the core of t=
he rubygems module - but there is nothing written to that file at all.

----------------------------------------
Bug #15787: rubygems.rb on read-only volume
https://bugs.ruby-lang.org/issues/15787#change-77756

* Author: extrowerk (Zolt=E1n Mizsei)
* Status: Open
* Priority: Normal
* Assignee: =

* Target version: =

* ruby -v: ruby 2.6.3p62 (2019-04-16 revision 67580) [x86_64-haiku]
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
On Haiku the package management just virtually extracts/populates the files=
, and as it doesn't have write-overlay feature, the populated files are rea=
d-only.

Issue: Ruby has to maintain a list of installed gems in a single file, in r=
ubygems.rb. Ruby stats this file, and bails out if it is read-only:

```
~ =BB ruby --version
ruby 2.6.3p62 (2019-04-16 revision 67580) [x86_64-haiku]
~ =BB ruby
Traceback (most recent call last):
        1: from <internal:gem_prelude>:2:in `<internal:gem_prelude>'
<internal:gem_prelude>:2:in `require': Operation not supported -- /boot/sys=
tem/lib/ruby/2.6.0/rubygems.rb (LoadError)
~ =BB ls -la /boot/system/lib/ruby/2.6.0/rubygems.rb
-r--r--r-- 1 user root 36970 m=E1rc.  6 10:01 /boot/system/lib/ruby/2.6.0/r=
ubygems.rb
~ =BB uname -a
Haiku shredder 1 hrev53091 Apr 22 2019 22:17:21 x86_64 x86_64 Haiku
``` =


The 2.2.x branch was not affected, but since 2.3 every version have this pr=
oblem. Happens here: https://github.com/ruby/ruby/blob/trunk/ruby.c#L2098

Either it has to create this file somewhere in non-packaged (this is the wr=
iteable folderstructure) and hope it won't get out of sync when pkgman (pac=
kage updater software) updates Ruby packages, or it has to be fixed to enum=
erate them directly by examining the directories.
The fact that this file is located in a packaged tree also hints that Ruby =
will probably want to also use packaged location for manual gems installs, =
which obviously won't work either.

Question: is it possible to force/instrument ruby to use a user-specific "r=
ubygems.rb" if the system one read only?

Probably this problem exists on other platforms too, where the user doesn't=
 have write-right to this file. How is it handled?

Thank You!



-- =

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