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How to restore /var/db/dyld cache?
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How to restore /var/db/dyld cache?


  • Subject: How to restore /var/db/dyld cache?
  • From: James Bucanek <email@hidden>
  • Date: Tue, 11 Jan 2011 20:03:15 -0700

Greetings,

I'm the author of a backup solution for OS X. An issue that's come up with a few customers running 10.6 is dynamic library cache errors following a complete system volume restore.

The problem can be resolved by running update_dyld_shared_cache -force, but it isn't practical for my utility to run this automatically (especially since the restored system volume may not be the startup volume).

In 10.5, the man page for update_dyld_shared_cache says that it's run automatically by launchd and should never have to invoked manually. In 10.6, however, the man page for update_dyld_shared_cache says that it's run by Apple's installer and system update software, and might need to be run "if for some reason you used another mechanism alter the OS dylib," which of course a full restore of the system volume would do.

So is there some clever means by which I can cause the dyld cache to be rebuilt automatically? For example, can I safely exclude the /var/db/dyld/dyld_shared_cache_* files from the backup? Will 10.6 automatically rebuild the missing cache files when the system is rebooted?

TIA
--
James Bucanek

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