#!/bin/sh
#
# Generate a new package list file using ../check-vm
#

_usage()
{
    echo "Usage: $0 [options]"
    echo "  -A arch      override platform arch"
    echo "  -D distro    override platform distro"
    echo "  -n           show me, change nothing"
    echo "  -v           verbose (debugging)"
    echo "  -V version   override platform version"
    exit 1
}

showme=false
verbose=false
very_verbose=false
Distro=''
Version=''
Arch=''
while getopts 'A:D:nvV:?' p
do
    case "$p"
    in
	A)	Arch="$OPTARG"
		;;

	D)	Distro="$OPTARG"
		;;

	n)	showme=true
		;;

	v)	if $verbose
		then
		    very_verbose=true
		else
		    verbose=true
		fi
		;;

	V)	Version="$OPTARG"
		;;

	?)	_usage
		# NOTREACHED
    esac
done
shift `expr $OPTIND - 1`
[ $# -eq 0 ] || _usage

status=1		# failure is the default
if $very_verbose
then
    tmp=tmp
else
    tmp=/var/tmp/$$
    trap "rm -f $tmp.*; exit \$status" 0 1 2 3 15
fi
rm -f $tmp.*

# Need directory where this script is located so we can find the other
# scripts and control files
#
home=`echo $0 | sed -e 's/\/*new$//'`
home=`cd $home/..; /bin/pwd`
if [ ! -f $home/whatami ]
then
    echo "Botch: \$0=$0 -> bad \$home=$home ?"
    exit 1
fi

# Use the same algorithm as ../check-vm and ../list-packages to identify the
# correct package list file
#
if [ ! -f $home/packages.rc ]
then
    echo "Botch: cannot find $home/packages.rc"
    exit
fi

. $home/packages.rc

_setversions
# $distro, $version and $arch now set

# optionally over-ridden from the comand line ...
#
[ -n "$Distro" ] && distro="$Distro"
[ -n "$Version" ] && version="$Version"
[ -n "$Arch" ] && arch="$Arch"

echo >&2 "Info: distro=$distro version=$version arch=$arch"

echo "# PCP required package list for $distro $version $arch" >$tmp.list
echo "# created by `id -un` on `hostname` `date`" >>$tmp.list
echo "#" >>$tmp.list

$home/check-vm -fap \
| tr ' ' '\012' \
| sed \
    -e 's/\(.*\)(\(.*\))/\2 \1/' \
| LC_COLLATE=POSIX sort \
| uniq >>$tmp.list

if [ -f "${distro}+${version}+$arch" ]
then
    grep -v '^# created' <$tmp.list >$tmp.new
    grep -v '^# created' <"${distro}+${version}+$arch" >$tmp.old
    if cmp $tmp.new $tmp.old >/dev/null
    then
	echo "${distro}+${version}+$arch: no change"
    else
	if $verbose
	then
	    echo "${distro}+${version}+$arch: exists, diffs"
	    diff -u "${distro}+${version}+$arch" $tmp.list
	fi
	if $showme
	then
	    echo "+ mv ${distro}+${version}+$arch ${distro}+${version}+$arch.old"
	    echo "+ install new ${distro}+${version}+$arch"
	else
	    mv "${distro}+${version}+$arch" "${distro}+${version}+$arch.old"
	    mv $tmp.list "${distro}+${version}+$arch"
	    echo "${distro}+${version}+$arch: updated"
	fi
    fi
else
    if $showme
    then
	echo "+ install new ${distro}+${version}+$arch"
	cat $tmp.list
    else
	mv $tmp.list "${distro}+${version}+$arch"
	echo "${distro}+${version}+$arch: created"
    fi
fi
