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Friday, 07 January 2022

10:50 PM

Ingo Juergensmann: Moving my repositories from Github to Codeberg.org [Planet Debian] 10:50 PM, Friday, 07 January 2022 06:40 AM, Sunday, 09 January 2022

Some weeks ago I moved my repositories from Github (evil, Microsoft, blabla) to Codeberg. Codeberg is a non-profit organisation located in Germany. When you really dislike Microsoft products it is somewhat a natural reaction (at least for me) to move away from Github, which was bought by Microsoft, to some more independent service provider for hosting source code. Nice thing with Codeberg is as well that it offers a migration tool from Github to Codeberg. Additionally Codeberg is also on Mastodon. If you are looking for a good service hosting your git repositories and want to move away from Github as well, please give Codeberg a try.

So, please update your git settings to https://github.com/ingoj to https://codeberg.org/Windfluechter (or the specific repo).

05:16 AM

My Favorite Warnings: closure [blogs.perl.org] 05:16 AM, Friday, 07 January 2022 12:20 AM, Friday, 07 January 2022

In the context of Perl, a closure is a piece of code that captures a specific instance of a lexical variable. A blog entry a month or so ago explores this in greater detail. If you review this blog entry, though, note that it does not cover lexical subroutines, which act more like anonymous subroutines even though they are named.

This blog entry, though, covers the closure warnings category.

This category has been around since warnings were introduced in Perl 5.6. I find four diagnostics in this category as of Perl 5.34.0; two related to lexical variables and two related to lexical subroutines. The "Variable" and "Subroutine" versions of these have similar causes, so I will not distinguish them in my discussion.

All of these diagnostics seem to arise from the fact that named, non-lexical subroutines are created at compile time, whereas lexical and anonymous subroutines are created at run time.

Subroutine "&%s" is not available

Variable "%s" is not available

This diagnostic can be issued under two conditions:

  • A named, non-lexical subroutine refers to an entity (variable or subroutine) in a lexical or anonymous subroutine. This is a problem because the lexical or anonymous subroutine has not been created yet.

  • A lexical or anonymous subroutine contains a stringy eval referring to a lexical entity. Because Perl does not look inside strings unless and until they are eval-ed, it can not close over this entity.


Subroutine "%s" will not stay shared

Variable "%s" will not stay shared

This diagnostic will be issued if a named, non-lexical subroutine refers to an entity (variable or subroutine) that may be created more than once. It is warning you that the named subroutine will only see the first instance of the entity, no matter how many instances are created in the course of execution.

PS, and somewhat off-topic: above, I said "... anonymous subroutines are created at run time." I believe the word "created" appeared in the Perl documentation I consulted for this blog post. A thorough blog entry (either this post or the "Closures" post) would address the subject of what "created" actually means. Unfortunately, I can not think of any way to address this other than reading the Perl code (see joe code in esr's Jargon File), and I have not gotten the courage to do that. I hope it does not mean "compile", but something more like "create an object consisting of the compiled code and all the lexical instances it closes over." If we're lucky, someone with a lot more Perl-fu than I have will clarify this.

Previous entries in this series:

  1. A Belated Introduction
  2. once
  3. redundant and missing
  4. exiting
  5. uninitialized
  6. redefine
  7. Ex-Warnings
  8. deprecated
  9. experimental
  10. shadow
  11. syntax
  12. ambiguous

01:20 AM

Draft: Dancer2 Deprecation Policy [blogs.perl.org] 01:20 AM, Friday, 07 January 2022 11:40 PM, Thursday, 06 January 2022

Hello fellow Dancers!

I have posted a draft deprecation policy for the Dancer2 code base for public review.

The Dancer Core Team has done our best to look at this every which way and cover all potential issues and use cases, but we're sure to have missed something here or there. So take a look and let us know. Your feedback is welcome - please add comments, feedback, and suggestions on the issue.

Thanks in advance! :-)

12:00 AM

Reproducible Builds (diffoscope): diffoscope 199 released [Planet Debian] 12:00 AM, Friday, 07 January 2022 09:20 AM, Friday, 07 January 2022

The diffoscope maintainers are pleased to announce the release of diffoscope version 199. This version includes the following changes:

[ Chris Lamb ]
* Support both variants of "odt2txt", including the one provided by unoconv.
  (Closes: reproducible-builds/diffoscope#298)

[ Jelle van der Waa ]
* Add external tool reference on Arch Linux for xb-tool.

You find out more by visiting the project homepage.

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