bug#64226: 30.0.50; emacs-lisp-native-compile-and-load permission error

[No Wayman]

Eli Zaretskii <eliz@gnu.org> writes:

> > From: No Wayman <iarchivedmywholelife@gmail.com>
> > Date: Wed, 21 Jun 2023 12:58:40 -0400
> >
> >
> > To reproduce:
> >
> > 1. Find an elisp file located in $DIR which user has permission 
> > to 
> > write to.
> > (in the following backtrace, the file being compiled was 
> > located 
> > at $HOME/.emacs.d/elpaca/builds/elpaca/elpaca.el)
> > 2. M-x emacs-lisp-native-compile-and-load 
> > 3. Observer the following error: 
> >
> > Error: permission-denied (\"Creating file with prefix\" 
> > \"Permission denied\" 
> > \"/usr/lib/emacs/30.0.50/native-lisp/30.0.50-58a66af6/elpaca-0646d6fc-1256ece5\")
> >   mapbacktrace(#f(compiled-function (evald func args flags) 
> >   #<bytecode 0x835cf36bbae8692>))
> >   debug-early-backtrace()
> >   debug-early(error (permission-denied \"Creating file with 
> >   prefix\" \"Permission denied\" 
> >   \"/usr/lib/emacs/30.0.50/native-lisp/30.0.50-58a66af6/elpaca-0646d6fc-1256ece5\"))
> >   
> > make-temp-file(\"/usr/lib/emacs/30.0.50/native-lisp/30.0.50-58a66af6/elpaca-0646d6fc-1256ece5\"
> >   nil \".eln.tmp\" nil)
> >   
> > comp--compile-ctxt-to-file(\"/usr/lib/emacs/30.0.50/native-lisp/30.0.50-58a66af6/elpaca-0646d6fc-1256ece5.eln\")
> >   
> > comp-compile-ctxt-to-file(\"/usr/lib/emacs/30.0.50/native-lisp/30.0.50-58a66af6/elpaca-0646d6fc-1256ece5.eln\")
> >   comp-final1()
> >   
> > load-with-code-conversion(\"/tmp/emacs-int-comp-elpaca-0646d6fc-1256ece5-73Dpd0.el\"
> >   \"/tmp/emacs-int-comp-elpaca-0646d6fc-1256ece5-73Dpd0.el\" 
> >   nil 
> >   t)
> >   command-line-1((\"-l\" 
> >   \"/tmp/emacs-int-comp-elpaca-0646d6fc-1256ece5-73Dpd0.el\"))
> >   command-line()
> >   normal-top-level()
> >
> > I would expect compiling this to not signal an error for a file 
> > I 
> > have permission to write.

> Is this in "emacs -Q"?  If not, please see if "emacs -Q" 
> reproduces
> the problem.

I have reproduced from emacs -Q as well. Same error as above:


Compiling /home/n/.emacs.d/elpaca/repos/elpaca/elpaca.el...done
comp--native-compile: Native compiler error: 
"/home/n/.emacs.d/elpaca/repos/elpaca/elpaca.el", "Compiling 
/usr/lib/emacs/30.0.50/native-lisp/30.0.50-58a66af6/elpaca-0646d6fc-1256ece5.eln...
Creating file with prefix: Permission denied, 
/usr/lib/emacs/30.0.50/native-lisp/30.0.50-58a66af6/elpaca-0646d6fc-1256ece5

Error: permission-denied (\"Creating file with prefix\" 
\"Permission denied\" 
\"/usr/lib/emacs/30.0.50/native-lisp/30.0.50-58a66af6/elpaca-0646d6fc-1256ece5\")
 mapbacktrace(#f(compiled-function (evald func args flags) 
 #<bytecode 0x70d6f07f3ae8645>))
 debug-early-backtrace()
 debug-early(error (permission-denied \"Creating file with 
 prefix\" \"Permission denied\" 
 \"/usr/lib/emacs/30.0.50/native-lisp/30.0.50-58a66af6/elpaca-0646d6fc-1256ece5\"))
 make-temp-file(\"/usr/lib/emacs/30.0.50/native-lisp/30.0.50-58a66af6/elpaca-0646d6fc-1256ece5\" 
 nil \".eln.tmp\" nil)
 
comp--compile-ctxt-to-file(\"/usr/lib/emacs/30.0.50/native-lisp/30.0.50-58a66af6/elpaca-0646d6fc-1256ece5.eln\")
 
comp-compile-ctxt-to-file(\"/usr/lib/emacs/30.0.50/native-lisp/30.0.50-58a66af6/elpaca-0646d6fc-1256ece5.eln\")
 comp-final1()
 load-with-code-conversion(\"/tmp/emacs-int-comp-elpaca-0646d6fc-1256ece5-oSdhiB.el\" 
 \"/tmp/emacs-int-comp-elpaca-0646d6fc-1256ece5-oSdhiB.el\" nil 
 t)
 command-line-1((\"-l\" 
 \"/tmp/emacs-int-comp-elpaca-0646d6fc-1256ece5-oSdhiB.el\"))
 command-line()
 normal-top-level()

> I also don't understand why the backtrace above seems to imply 
> that
> you invoked Emacs like this:
>
>   emacs -l 
>   /tmp/emacs-int-comp-elpaca-0646d6fc-1256ece5-73Dpd0.el

> IOW, the backtrace doesn't show invocation of
> emacs-lisp-native-compile-and-load, it shows the attempt to load 
> an
> already-compiled .eln file.  What am I missing?  I added Andrea 
> to
> this discussion.

The compilation takes place in a subprocess, no?
That's probably how the subprocess is invoked.