gEDA-bug: [Bug 698565] Re: Save button doesn't respect permissions

[Eivind Kvedalen <698565@xxxxxxxxxxxxxxxxxx>]

Your suggestion is essentially what happens today, I think. But your
solution will also not handle the read-only case; step two/three will
effectively "overwrite" foo.sch if it is read-only. So we need to check
access somehow; rename will not fail when replacing read-only files. The
only atomic way I know of is to actually try to open the file and
replace the contents, but then of course you are not guaranteed that the
operation will finish successfully.

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https://bugs.launchpad.net/bugs/698565

Title:
  Save button doesn't respect permissions

Status in GPL Electronic Design Automation tools:
  Triaged

Bug description:
  File->Save _sometimes_ fails to respect file-permissions.

  For example, when modifying a file with permissions:
  -r--r--r-- 1 pcjc2 pcjc2 510 2008-12-27 10:23 /home/pcjc2/geda/share/gEDA/sym/analog/resistor-2.sym

  The log window often gets the following text:
  o_save: Could not open [/home/pcjc2/geda/share/gEDA/sym/analog/resistor-2.sym]
  Could NOT save page [/home/pcjc2/geda/share/gEDA/sym/analog/resistor-2.sym]
  (Arguably we just need one descriptive message with a reason).

  However; on some occasions, the file gets overritten, creating a new file with permissions:
  -rw-r--r-- 1 pcjc2 pcjc2 490 2008-12-27 10:29 /home/pcjc2/geda/share/gEDA/sym/analog/resistor-2.sym

  Obviously this is not good!

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