Ok, I understand, now. I just leave multiple desktops in place and switch
between them as I want. But perhaps you have reasons to do it as you do. That is
one thing I really appreciate about Linux, the fact that there are many, many
ways to accomplish almost everything and that what is right and works for me may
not be what works best for you.
Your scripting style is irrelevant so long as it gets the job done for you. And
one tenet the Unix/Linux Philosophy is, "automate everything," which is what you
have done.
On 02/26/2015 09:21 AM, Niki Kovacs wrote:
Le 26/02/2015 15:00, David Both a écrit :
Perhaps I have not been following closely enough, but why go backwards?
Why not start with a "minimal" installation and then add only those
packages that are needed for your situation?
Here's why.
I'm currently experimenting with CentOS on my workstation, trying out
different desktop environments like GNOME3, KDE, MATE, Xfce. But at the same
time, I'm also working on that same workstation, for example developing
websites on a local LAMP stack, using multimedia apps like Audacity to edit
some audio tracks for my training courses, etc.
When switching from one desktop environment to another for the sake of trying
it out, there's always tons of cruft on the system, even after a yum
groupremove "Old Desktop Environment". And I don't want to do a fresh
reinstallation, because I have all my data and files in place, and this is a
RAID 1 installation, so it's not exactly trivial to reinstall and put
everything back in place.
Anyway, I spent a couple hours experimenting, and I found a satisfying
solution. It's not very elegant, but it works. Here goes.
1. First, make a list of the packages contained in a minimal installation.
This is easy, since I can do a minimal installation in a virtual guest, and
then run the following little script:
#!/bin/bash
#
# create_package_list.sh
#
# (c) Niki Kovacs, 2014
TMP=/tmp
RPMLIST=$TMP/rpmlist.txt
PKGLIST=$TMP/pkglist.txt
rm -f $RPMLIST $PKGLIST
rpm -qa | sort > $RPMLIST
sed 's/-[^-]*-[^-]*\.[^.]*\.[^.]*$//' $RPMLIST > $PKGLIST
2. I copy that package list to the 'core' file in my Git repo and run the
following script on the system I want to prune:
#!/bin/bash
#
# purge_system.sh
#
# (c) Niki Kovacs, 2014
CWD=$(pwd)
TMP=/tmp
RPMLIST=$TMP/rpmlist.txt
PKGLIST=$TMP/pkglist.txt
PKGINFO=$TMP/pkg_database
rpm -qa | sort > $RPMLIST
sed 's/-[^-]*-[^-]*\.[^.]*\.[^.]*$//' $RPMLIST > $PKGLIST
PACKAGES=$(egrep -v '(^\#)|(^\s+$)' $PKGLIST)
rm -rf $RPMLIST $PKGLIST $PKGINFO
mkdir $PKGINFO
# Create core package database
echo
echo "+=================================="
echo "| Creating core package database..."
echo "+=================================="
echo
sleep 3
CORE=$(egrep -v '(^\#)|(^\s+$)' $CWD/../pkglists/core)
for PACKAGE in $CORE; do
printf "."
touch $PKGINFO/$PACKAGE
done
unset CRUFT
# Check installed packages against core package database
echo
echo
echo "+========================================================"
echo "| Checking for packages to be removed from your system..."
echo "+========================================================"
echo
sleep 3
for PACKAGE in $PACKAGES; do
if [ -r $PKGINFO/$PACKAGE ]; then
continue
else
printf "."
CRUFT="$CRUFT $PACKAGE"
fi
done
echo
echo
# Remove all non-core packages
yum remove $CRUFT
I've tested this a few times, and it works as expected. I know my scripting
style is a bit hodge-podge. If you have a more elegant solution, I'm always
open for suggestions.
Cheers,
Niki
--
*********************************************************
David P. Both, RHCE
Millennium Technology Consulting LLC
Raleigh, NC, USA
919-389-8678
db...@millennium-technology.com
www.millennium-technology.com
www.databook.bz - Home of the DataBook for Linux
DataBook is a Registered Trademark of David Both
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