apt-cache dumpavail > /tmp/apt-chace; dpkg --update-avail /tmp/apt-chace;

[Shaul Karl <shaulk@israsrv.net.il>]

I want to avoid the need to run update from within dselect after apt-get 
dist-upgrade by writing the lines
	
	Post-Invoke {
		"apt-cache dumpavail > /tmp/apt-chace";
		"dpkg --update-avail /tmp/apt-cache";
		"rm -v /tmp/apt-chace";
	        "mount -o remount,ro /usr";
	};

in /etc/apt/apt.conf.

Is that reasonable? Are there any issues of file locking, breaking the regular 
backups of the available and status files or other things that needs special 
care?
How can I avoid the /tmp/apt-cache file?
Is there a better way to handle this?