Re: How to get better stack trace from a script executed via shebang?

[wolf <wolf@wolfsden.cz>]

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On 2023-02-02 17:39:50 +0100, Jean Abou Samra wrote:
> On 02/02/2023 17:11, Wolf wrote:
> > Hello,
> > 
> > I'm having a problem of getting borderline useless stack traces from a script
> > executed via a shebang. For example, let's consider following script:
> > 
> >     $ cat /tmp/x.scm 
> >     #!/bin/sh
> >     exec guile --no-auto-compile -e main -s "$0" "$@"
> >     !#
> >     
> >     (define (main args)
> >       (foo))
> >     
> >     (define (foo)
> >       (bar))
> >     
> >     (define (bar)
> >       (error "x"))
> > 
> > When I execute it directly, the error message is not great:
> > 
> >     $ /tmp/x.scm
> >     Backtrace:
> >     In ice-9/boot-9.scm:
> >       1752:10  4 (with-exception-handler _ _ #:unwind? _ #:unwind-for-type _)
> >     In unknown file:
> >                3 (apply-smob/0 #<thunk 7fdb1e7a2340>)
> >     In ice-9/boot-9.scm:
> >         724:2  2 (call-with-prompt ("prompt") #<procedure 7fdb1e7b2c80 at ice-9/eval.scm:330:13 ()> #<procedure default-prompt-handler (k proc)>)
> >     In ice-9/eval.scm:
> >         619:8  1 (_ #(#(#<directory (guile-user) 7fdb1e7a5c80>)))
> >     In ice-9/boot-9.scm:
> >        2007:7  0 (error _ . _)
> >     
> >     ice-9/boot-9.scm:2007:7: In procedure error:
> >     x
> > 
> > The /tmp/x.scm file is not even mentioned once in the output. Can this be
> > somehow (command line arguments, changing the exec line, ...) improved?
> > Currently it's not very useful when I need to find out what the problem was.
> 
> 
> 
> This is a known issue for code that is evaluated, as opposed
> to being compiled. Consider leaving out --no-auto-compile.

Oh, I was not aware of that. You suggestion does indeed make it better, thank
you.

    ;;; note: source file /mnt/shared/system/./run
    ;;;       newer than compiled /root/.cache/guile/ccache/3.0-LE-8-4.6/mnt/shared/system/run.go
    ;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0
    ;;;       or pass the --no-auto-compile argument to disable.
    ;;; compiling /mnt/shared/system/./run
    ;;; compiled /root/.cache/guile/ccache/3.0-LE-8-4.6/mnt/shared/system/run.go

Now there is this output that as far as I know cannot be suppressed (that was
the reason for --no-auto-compile), but that seems like lesser of two evils
here.

So, thanks :)

W.

-- 
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.

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