syncing with google calendar, file changed on disk

[Tyler Smith <tyler.smith@mail.mcgill.ca>]

Hi,

Following the instructions from Worg (
http://orgmode.org/worg/org-tutorials/org-google-sync.html ), I've set
a cron job to download my google calendar, and use Eric Fraga's awk
script to convert it into google.org for inclusion in my agenda. This
works fine, and is currently my only syncing option as my access to
other web services (git, dropbox etc) is blocked at my workplace.

One small issue: the google calendar file changes regularly, even when
I haven't added or modified any appointments. As a consequence, I am
interrupted by Emacs reminding me that google.org has changed on disk,
and I need to respond before I can continue to browse my agenda. This
isn't a big deal, but maybe one of you know how to eliminate this
problem?

For the record, the sort of changes that I see are this:

~/.emacs.d/org$ diff google.org google.org-old
488c488
< ACTION:EMAIL
---
> ACTION:DISPLAY
490,491d489
< SUMMARY:Alarm notification
< ATTENDEE:mailto:xxx@gmail.com
495c493
< ACTION:DISPLAY
---
> ACTION:EMAIL
496a495,496
> SUMMARY:Alarm notification
> ATTENDEE:mailto:xxx@gmail.com


It seems the ACTION line switches back and forth between DISPLAY and
EMAIL. I don't understand the ics format to know what this means.

I have searched the mailing list and stackoverflow, but if this has
come up before I missed it. Thanks for your help,

Tyler