TL 2024 cannot be installed on some Windows computers (again!)

[Zdenek Wagner]

pá 6. 12. 2024 v 16:40 odesílatel Denis Bitouzé
<denis.bitouze at univ-littoral.fr> napsal:
>
> Unfortunately, same punishment with:
>
> PS D:\> set TEXLIVE_PREFER_OWN=1
>
> BTW:
>
> PS D:\> echo %TEXLIVE_PREFER_OWN%
>
> just returns:
>
> %TEXLIVE_PREFER_OWN%
>
See the screenshot from my Windows 7 running in VirtualBox

Zdeněk Wagner
https://www.zdenek-wagner.eu/


> ----- Mail original -----
> > De: "Zdenek Wagner" <zdenek.wagner at gmail.com>
> > À: "Bruno Voisin" <bvoisin at icloud.com>
> > Cc: "Denis Bitouzé" <denis.bitouze at univ-littoral.fr>, "Bruno Voisin via tex-live" <tex-live at tug.org>
> > Envoyé: Dimanche 1 Décembre 2024 11:36:58
> > Objet: Re: TL 2024 cannot be installed on some Windows computers (again!)
>
> > ne 1. 12. 2024 v 1:31 odesílatel Bruno Voisin via tex-live
> > <tex-live at tug.org> napsal:
> >>
> >> ...
> >>
> >> In the TL doc, this is only mentioned about the changes for year 2019
> >>
> >>   https://tug.org/texlive/doc/texlive-en/texlive-en.html#x1-880009.1.16
> >>   https://www.tug.org/texlive/doc/texlive-fr/texlive-fr.html#x1-9400010.1.16
> >>
> >> So, on Unix-style systems (I'm on the Mac myself), this would be something like
> >>
> >>   TEXLIVE_PREFER_OWN=1 install-tl -gui
> >>
> >> I don't know how to achieve the same on Windows. I checked for a mention of that
> >> variable (or its effect) in the Advanced screen of the install GUI, there's
> >> none.
> >>
> > The environment setting in Windows persist, you just type
> > set TEXLIVE_PREFER_OWN=1
> >
> > It will be used for all subsequent commands in the same "black
> > window", you can verify it by
> > echo %TEXLIVE_PREFER_OWN%
> >
> > Or you can define it in user's environment in the system setting, it
> > will then be used forever until the user removes it. And it will be
> > used even in programs started from GUI. I am not sure whether it is
> > necessary to restart Windows after such change in the system setting,
> > I am not a Windows expert.
> >
> >> Actually I wasn't aware of the above at all, found it the hard way by looking at
> >> the code. Inside the install package, there's
> >> texmf-dist/scripts/texlive/tlmgr.pl which on lines 7155 ff. delegates the task
> >> of locating the executables to a setup_programs variable, writing
> >>
> >>   # setup the programs, for w32 we need the shipped wget/xz etc, so we
> >>   # pass the location of these files to setup_programs.
> >>
> >> setup_programs is set in tlpkg/TeXLive/TLUtils.pm on lines 2890 ff., telling the
> >> OS utilities are preferred save for tar on Windows (the tar-specific code is on
> >> lines 2930 ff.).
> >>
> >> That's where TEXLIVE_PREFER_OWN comes in. Say the comments there:
> >>
> >>   If the C<$tlfirst> argument or the C<TEXLIVE_PREFER_OWN> envvar is set,
> >>   prefer TL versions; else prefer system versions (except for Windows
> >>   C<tar.exe>, where we always use ours).
> >>
> >> I don't know why the same is not done for xz as for tar (ie ensuring that the TL
> >> version is used on Windows). Maybe simply the problem wasn't widely known.
> >>
> >> Bruno
> >>
> >>
> >
> > Zdeněk Wagner
> > https://www.zdenek-wagner.eu/
>
> --
> Denis
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