[bug #61892] [pdfpic] makes too much noise if .PDFPIC file argument nonexistent

[G. Branden Robinson]

URL:
  <https://savannah.gnu.org/bugs/?61892>

                 Summary: [pdfpic] makes too much noise if .PDFPIC file
argument nonexistent
                 Project: GNU troff
            Submitted by: gbranden
            Submitted on: Fri 21 Jan 2022 04:11:21 AM UTC
                Category: Macro - others/general
                Severity: 3 - Normal
              Item Group: Warning/Suspicious behaviour
                  Status: In Progress
                 Privacy: Public
             Assigned to: gbranden
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None

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Details:


$ ./build/test-groff -U -Tpdf EXPERIMENTS/gnu.groff >| EXPERIMENTS/gnu2.pdf 
I/O Error: Couldn't open file 'GNU.pdf': No such file or directory.
troff:EXPERIMENTS/gnu.groff:3: error: division by zero
Failed to open PDF 'GNU.pdf'


That's too much chatter, and might lead a high-strung user, nervous about
"unsafe mode", to assume they're suffering some sort of attack.

Make this more robust.  Since we're unsafe already, we can shell out to test
for the existence of the file argument, though there are of course the classic
TOCTTOU problems that arise from this, and there probably aren't portable
enough ways to acquire an actually-existing file with a lock.  Oh well, I
guess that's why they call it "unsafe mode".




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