FreeBSD problems and preliminary ways to solve

[Maxim Ignatenko]

Hi,

pkgng looks great, but I suggest to add in-place upgrade feature. Now packages 
upgraded with just deleting and installing new version, which is not so fast 
and requires some "dirty" tricks with config files to correctly delete 
unmodified configs on pkg_delete and keep modified.

Instead, we can simply overwrite only those files, that differs with previous 
version and even keep any user-modified files without any special tricks in 
port's Makefile and package metadata. Also, in this case upgrading package 
between minor versions will generate much less write requests to FS.

But this requires to make some changes in ports infrastructure. Each port need 
to be installed to some temporary location first, and only then changed files 
should be moved in place. Using tmpfs as temporary location will slightly 
reduce "make upgrade" time, comparing to "make deinstall install". Another way 
is to create binary package directly and leave all upgrading logic in pkgng.