#!/bin/bash
#JustUpgrade - a tool for safe RPM upgrades
#Copyright 1998, William Stearns (wstearns@pobox.com)

if [ ! -d done ]; then mkdir done ; fi
if [ ! -d done ]; then echo Cannot create directory "done" - exiting ; exit ; fi
if [ ! -d notinst ]; then mkdir notinst ; fi
if [ ! -d notinst ]; then echo Cannot create directory "notinst" - exiting ; exit ; fi

if [ "${1}" = "" ]; then
	cat <<EOF
JustUpgrade - an RPM safe upgrader
Usage: ju new_rpm_file_to_upgrade.rpm
Suggested location: /usr/bin/ju
Copyright 1998, William Stearns (wstearns@pobox.com)
- If no previous version has been installed, this rpm will be moved into a 
"notinst" subdirectory.
- If a previous version is installed and the previous version has not been 
modified since installation, this rpm will replce it, then this rpm will 
be moved into a "done" subdirectory.
- If the previous version has been modified, this script will end.  You 
will need to figure out whether to upgrade it.  Try "rpm -V package_name"
to figure out whether this is an issue.
- If the upgrade fails (usually for some dependency issue), the rpm will 
also be left in the current directory.  Try "rpm -Uvh package_name...rpm" to 
see why the upgrade failed.
- If you want to upgrade all the files in a directory, try:
    for ONEPKG in *.rpm ; do ju \${ONEPKG} ; done
    for ONEPKG in *.rpm ; do ju \${ONEPKG} ; done
    for ONEPKG in *.rpm ; do ju \${ONEPKG} ; done
    for ONEPKG in *.rpm ; do ju \${ONEPKG} --replacepkgs ; done
The second and third passes allow rpms that depend on other (not yet installed)
rpms to be installed.  The last pass handles the case where you might have 
an identical version from a previous distribution installed.  
- The files left in the directory need manual attention.
EOF
	exit
fi

PNAME=`rpm -qpi $1 | grep '^Name\W*: ' | sed -e 's/Name\W*: //' | awk '{ print $1 }'`

if rpm -q ${PNAME} >/dev/null 2>/dev/null && [ `rpm -q ${PNAME} | wc -l` -eq 1 ]; then
	#echo ${PNAME} installed
	RPMV=`rpm -V ${PNAME}`
	if [ `echo -n ${RPMV} | wc -l` -eq 0 ]; then
		#echo `rpm -V ${PNAME} | wc -l`
		echo ${PNAME} verifies true - upgrading
		if rpm -Uvh $1 $2 ; then
			echo Upgrade succeeded
			#mv -f $1 done/
			cat /dev/null >${1}
		else
			echo Upgrade failed for $1
		fi
	else
		#echo `rpm -V ${PNAME} | wc -l`
		echo ${PNAME} verifies false - not upgrading
		#echo "${RPMV}" | less
	fi
elif [ `rpm -q ${PNAME} | wc -l` -gt 1 ]; then
	echo More than one ${PNAME} installed - please fix.
else
	echo ${PNAME} not installed - not installing new
	mv $1 notinst/
fi
sleep 2