linprocfs and linux_base port upgrade

[Boris Samorodov]

Hi!


Assume that one has a linux_base port installed and linprocfs is
mounted. The task is to upgrade the linux_base port. We do:
  - Un-mounting linprocfs;
  - deletting /compat/linux (along /compat/linux/proc);
  - ...

The problem: a short period of time (well, it may be not so short
accoring to various curcumstances) exists when there _is no_
/compat/linux/proc directory and linprocfs _is_ defined at
/etc/fstab. If something goes wrong when upgrading (system panic, port
upgrading errors, etc) one can get an unbootable machine.

I think that a linux_base port should:
  - comment the linprocfs definition right after removing
    /compat/linux/proc directory;
  - remove the comment after creating the needed directory.

The comment itself should be a readable and unique one (ie all
linux_base ports should use the same text). Ex.:
"#*linux_base autocomment*".


Do you have some other ideas?


Thanks.
-- 
Boris B. Samorodov, Research Engineer
InPharmTech Co,     http://www.ipt.ru
Telephone & Internet Service Provider