Mike Meyer wrote:
In <[EMAIL PROTECTED]>, Andrey V. Elsukov <[EMAIL PROTECTED]> typed:
Hi, All!
I've ported NetBSD magic symlinks implementation to FreeBSD.
The description of magiclinks can been found here:
http://www.daemon-systems.org/man/symlink.7.html
This kind of thing has been showing up in Unix variants for a couple
of decades, but none have have ever caught on. Can you provide some
examples of what this is being used for?
An interesting use for this is found in an commercial embedded platform
where a system image is selected with a @sys variable symlink. This is
used for live upgrades (and fast backouts or test boots) of the platform
where a new image is extracted from a .tgz to /image/$new_version and
the @sys variable is likely updated by the boot loader for the next boot.
# ls -l /usr
lrwxr-xr-x 1 root wheel 8 Oct 3 13:32 /usr -> @sys/usr
# cd /usr
# pwd
/image/OS-VERSION-BUILD-ID/usr
Here a sysctl/kenv variable defines the @sys link target
kern:@sys = image/OS-VERSION-BUILD-ID
Regards
--
Pawel
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