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Protect directory/file ?

I'm sorry, my english is worse.

exists any way to protect directories and files against apt/dpkg changes ?

I'm using lot of modifications to make my Debian perfect for me (for example
modified init scripts, udev rules or my own /etc/apache2 layout). This is big
pain everytime when I update packages - all files meant as program parts (no
configuration files) are overwritten and changes I've made are lost. Then
I must move proper files from my backup to their directories.

Now I'm looking for a better hack/workaround to protect my modifications. I 
wonder if is it possible to redirect package files extraction to another 
directory (for example to put .protect file to /etc containing line 
REDIRECT="/tmp/etc-apt" and then all attempts to write file in /etc or
its subdirectories will be redirected to the /tmp/etc-apt/...)

I found something similar in tool dpkg-divert, but its oriented to single files
and maintaining long list of contents of all directories will be bigger pain
than rewriting parts of hdd with my "overlay".

Thank you,

Ondrej Balaz <ondra@blami.net>

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