Re: No readline in scheme-sandbox

[David Wright]

On Sat 22 Oct 2016 at 11:27:41 (+0200), Thomas Morley wrote:
> 2016-10-22 11:13 GMT+02:00 David Kastrup <address@hidden>:
> > Thomas Morley <address@hidden> writes:
> >
> >> 2016-10-22 10:12 GMT+02:00 David Kastrup <address@hidden>:
> >>> Thomas Morley <address@hidden> writes:
> >>>
> >>>> The first hit reads in sourcefiles/guile.changelog:
> >>>>
> >>>> guile (1.8.1-2) unstable; urgency=low
> >>>>
> >>>>   * Add readline as build dependency, libreadline8 as dependency for
> >>>>     libguile17 (thanks Ted Anderson).
> >>>>   * Remove /etc/hints.
> >>>>   * Remove curr from hints.
> >>>>
> >>>>  -- Jan Nieuwenhuizen <address@hidden>  Tue, 31 Oct 2006 00:47:35 +0100
> >>>>
> >>>> No idea whether it's important, it's far beyond my depth.
> >>>
> >>> That would point to readline support being compiled in.  libreadline8
> >>> would likely be the current one.
> >>>
> >>> At any rate, David stated that calling the lilypond executable with full
> >>> path left him with working readline support.
> >>>
> >>> Does
> >>>
> >>>     which lilypond
> >>>
> >>> agree that the version called without explicit path is the same as with
> >>> path?  If so, something in command line processing would appear to make
> >>> use of the 0th argument for finding libraries.  That would warrant more
> >>> examination.
> >>>
> >>> --
> >>> David Kastrup
> >>
> >>     which lilypond
> >> returns in my case:
> >> /home/hermann/bin/lilypond
> >> which is the script for 2.18.2 I mentioned in my previous post.
> >
> > David stated:
> >
> >     I find the following:
> >
> >     1)
> >
> >     If I run 'lilypond scheme-sandbox' I get a message saying:
> >
> >     /usr/local/lilypond/usr/share/lilypond/current/ly/scheme-
> >     sandbox.ly:3:2: error: GUILE signaled an error for the expression
> >     beginning here
> >     #
> >      (load-user-init)
> >     readline is not provided in this Guile installation
> >
> >     In 'top' I can see that the actual running command is
> >     '/usr/local/lilypond/usr/bin/lilypond scheme-sandbox'.
> >
> >     2)
> >
> >     If I run '/usr/local/lilypond/usr/bin/lilypond scheme-sandbox' directly
> >     from the command line, I get guile complete with readline.
> >
> >
> > which sounds like he is _not_ running the wrapper script when stuff
> > works but rather the executable without the wrapper.  So it would appear
> > that what the wrapper does happens to interfere with finding the system
> > readline library while LilyPond presumably does not provide one of its
> > own.  Who is the main author of that wrapper?  Maybe he has an idea?
> >
> > --
> > David Kastrup
> 
> The entire (unchanged) wrapper script reads:
> 
> #!/bin/sh
> me=`basename $0`
> export LD_LIBRARY_PATH="/home/hermann/lilypond/usr/lib"
> exec "/home/hermann/lilypond/usr/bin/$me" "$@"
> 
> Commenting the line "export ..." works, though I can't imagine the 
> consequences.
> No idea who wrote the script, though.

Presumably whoever built /home/hermann/lilypond/usr/bin/* wanted them
to link to the particular set of libraries which they provided under
/home/hermann/lilypond/usr/lib which also came in the installation file.

If you export LD_LIBRARY_PATH="/home/hermann/lilypond/usr/bin"
instead, then you just prevent those libraries from being found
because they're not under /home/hermann/lilypond/usr/bin.

Not setting it will have the same effect (except in the pathological
case where someone has LD_LIBRARY_PATH set globally, a Bad Thing).

Cheers,
David.