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

[Peter TB Brett <698565@xxxxxxxxxxxxxxxxxx>]

http://stackoverflow.com/questions/1812115/how-to-safely-write-to-a-file

So I think we need to:

1) Create foo.sch# and write new data to it with g_file_set_contents().  If that fails, not a problem.
2) Rename foo.sch to foo.sch~. If that fails, remove foo.sch# and flag an error.
3) Rename foo.sch# to foo.sch. If that fails, attempt to rename foo.sch~ back to foo.sch and remove foo.sch#. Either way, flag an error.
4) Success!

Does that sound plausible?

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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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