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
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