Re: hgsave weirdness

[John W. Eaton]

On 9/23/19 3:11 PM, Dmitri A. Sergatskov wrote:
> On Mon, Sep 23, 2019 at 2:00 PM Rik <address@hidden> wrote:
>
> > error: hgload: unable to locate file t2.ofig
> > error: called from
> >      hgload at line 60 column 7
> >      t2 at line 5 column 3
> >
> > the problem is in hgload at line 60.  If I look at that code, I see
> >
> > if (isempty (file_in_loadpath (filename)))
> >    error ("hgload: unable to locate file %s", filename);
> > endif
> >
> > So, I would start with the debugger and when you reach line 60 take a look at 
> > your path variable.  Maybe something is removing '.' from the search path 
> > (.octaverc configuration file?).
>
> I tried and "." is the very first in path.
> It works also if I run it it immediately the second time.
>
> Also:
>
> octave:1> t2
> fname = t2.ofig
> error: hgload: unable to locate file t2.ofig
> error: called from
>      hgload at line 60 column 7
>      t2 at line 6 column 3
> octave:2> file_in_loadpath ("t2.ofig")
> ans = /d2/home/dima/src/octave/clang/t2.ofig
>
> But it is something with loadpath. If I change fname to /tmp/t2.ofig it works.

Yes, the bug appears to be in file_in_loadpath.  If I make the following 
change in hgload.m, it will loop forever.  But stat shows that the file 
exists and I can see it with ls in a command window while Octave is looping.

diff --git a/scripts/plot/util/hgload.m b/scripts/plot/util/hgload.m
--- a/scripts/plot/util/hgload.m
+++ b/scripts/plot/util/hgload.m
@@ -56,9 +56,13 @@ function [h, old_prop] = hgload (filenam
       error ("hgload: unable to locate file %s", filename);
     endif
   else
-    if (isempty (file_in_loadpath (filename)))
-      error ("hgload: unable to locate file %s", filename);
-    endif
+    ii = 0;
+    while (isempty (file_in_loadpath (filename)))
+      stat (filename)
+      ii++
+      pause (1);
+    endwhile
+    ii
   endif

   ## Load the handle structure


I'm guessing a loadpath caching error for filenames that are not absolute?

Trying older versions, it looks like it first started failing in 4.2.x.

jwe