[clug] config backups
Antti.Roppola at brs.gov.au
Antti.Roppola at brs.gov.au
Tue Jun 29 04:47:41 GMT 2004
Last month's CLUG had an interesting talk version control
systems, including discussion of how they can be used to
keep track of things like /etc and /home. A nice part of it
is that backups are only made when content is edited.
Antti
-----Original Message-----
From: Kim Holburn [mailto:kim.holburn at anu.edu.au]
Sent: Tuesday, 29 June 2004 2:18 PM
To: CLUG List
Subject: [clug] config backups
Hi,
I want to do what I thought was a simple thing to do. I have a number
of systems where I take a backup of the system configuration using tar
every so often.
I want to automate the process by using a script. What I would like to
do is check to see if changes have been made and only backup if changes
have been made (or every 10,000km whichever comes first).
I was testing the tar -d (--diff) option and I discovered it would do
everything I wanted except one thing. It doesn't check for new files
added into directories since the tar file was created. I guess it's
hard for tar to know if the archive was created by pointing to a
directory or a list of files.
Now to get what I want I have to make a list of all the files I think
should be there and compare it with the list tar gives me. Whew. So
here's my script.
Can anyone think of an easier way?
#!/bin/sh
# backup if changed
oldfile="/var/backup/etc.tgz"
save-it () {
cd etc
tar -czf "$oldfile" .
}
if tar --exclude-from /etc/tar.exclusions --wildcards -dzf "$oldfile"
; then
tar -tzf "$oldfile" |sed -e 's#/$##'| sort >/tmp/tar.list.$$
find /etc|cut -c6- | grep -v -x -F /etc/tar.exclusions | sort
>/tmp/find.list.$$
if [ "`diff -bBU0 /tmp/find.list.$$ /tmp/tar.list.$$ |grep '^-[^-]'|
wc -l`" -gt 0 ]; then
echo "New file(s) found: "
diff -bBU0 /tmp/find.list.$$ /tmp/tar.list.$$ |grep '^-[^-]'
save-it
fi
# rm /tmp/find.list.* /tmp/tar.list.*
else
save-it
fi
Kim
--
Kim Holburn
IT Manager, Canberra Research Laboratory
National Information and Communication Technology Australia
Ph: +61 2 61258620 M: +61 417820641
Email: kim.holburn at anu.edu.au - PGP Public Key on request
Aust. Spam Act: To stop receiving mail from me: reply and let me know.
Democracy imposed from without is the severest form of tyranny.
-- Lloyd Biggle, Jr. Analog, Apr 1961
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