Re: Tiger kextcache command
Re: Tiger kextcache command
- Subject: Re: Tiger kextcache command
- From: Kevin Van Vechten <email@hidden>
- Date: Thu, 12 May 2005 15:15:33 -0700
Hi Gilles,
I too ran into this issue while making the Darwin 8.0.1 CDs, where it
won't work to simply touch the Extensions directory, since while
booting from a CD, the mkext cannot be written back out =).
The issue is that kextcache puts a temporary file in /tmp and then
attempts to rename it (using rename(2)) to the destination. I assume
this is done so that the mkext will be replaced atomically. As you
found, this doesn't work so well when the destination is not the root
device. The workaround is to set the TMPDIR environment variable
prior to running kextcache. Make sure TMPDIR points to a path that
is on the same volume as the destination. Also, be sure to specify
the correct kernel to use (-K) when you're targetting another
volume. Using your example:
$ export TMPDIR=/Volumes/ExternalDisk/private/var/tmp
$ sudo kextcache -l -K /Volumes/ExternalDisk/mach_kernel -m /Volumes/
ExternalDisk/System/Library/Extensions.mkext /Volumes/ExternalDisk/
System/Library/Extensions
- Kevin
On May 12, 2005, at 9:08 AM, Garth Cummings wrote:
On May 12, 2005, at 1:23 AM, Gilles Vayssié (TRI-EDRE) wrote:
Hi,
i encounter a problem with the kextcache command under Tiger (8A428).
I would like to update cache on an external volume.
Why? Because on startup, the volume is read online, so the caches
can't be updated.
So i need to update the cache before booting on this volume, from
an "alive" system.
Here is how i did under Panther, and it worked well:
sudo kextcache -l -m /Volumes/ExternalDisk/System/Library/
Extensions.mkext /Volumes/ExternalDisk/System/Library/Extensions
The supported way to do this is:
sudo touch /Volumes/ExternalDisk/System/Library/Extensions
When the volume is next booted, the boot loader will notice that
the KEXT caches are out of date and rebuild them.
The problem with manually tweaking the caches is that each version
of Mac OS X implements a different set of caches, and how they work
is considered an implementation detail that developers shouldn't
care about. Touching the Extensions directory will assure that the
proper caches are rebuilt on all versions of Mac OS X.
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