[Bug 336866] Re: When adding tag or updating description, lp_save() gives "HTTP Error 412: Precondition Failed"

[William Grant]

** Changed in: lazr.restful
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/336866

Title:
  When adding tag or updating description, lp_save() gives "HTTP Error
  412: Precondition Failed"

Status in lazr.restful:
  Fix Released
Status in “lazr.restfulclient” package in Ubuntu:
  Invalid
Status in “lazr.restfulclient” source package in Lucid:
  Invalid

Bug description:
  Getting this error consistently when attempting to add a tag using the
  following code (which worked last time I ran it a few weeks ago).

       if not tag in bug.tags:
             #bug.tags.append(tag)                                                                
              # Workaround bug #254901                                                                  
              tag_list = bug.tags
              tag_list.append(tag)
              bug.tags = tag_list

              print " ---> Tagged ",tag
              bug.lp_save()

  I also tested with the commented line instead of the workaround code;
  same error.

  Traceback (most recent call last):
    File "./process-new-bugs.py", line 175, in <module>
      bug.append_tag("needs-lspci-vvnn")
    File "/home/bryce/src/Arsenal/arsenal/contrib/arsenal_lib.py", line 125, in append_tag
      self.bug.lp_save()
    File "build/bdist.linux-x86_64/egg/launchpadlib/resource.py", line 489, in lp_save
    File "build/bdist.linux-x86_64/egg/launchpadlib/_browser.py", line 266, in patch
    File "build/bdist.linux-x86_64/egg/launchpadlib/_browser.py", line 212, in _request
  launchpadlib.errors.HTTPError: HTTP Error 412: Precondition Failed

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