#!/bin/sh
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

set -e
vardir="$1"
method=$2
option=$3

cd "$vardir/methods/disk"

. ./shvar.$option

xit=1
trap '
	if [ -n "$umount" ]
	then
		umount "$umount" >/dev/null 2>&1
	fi
	exit $xit
' 0

if [ -n "$p_blockdev" ]
then
	umount="$p_mountpoint"
	mount -rt "$p_fstype" -o nosuid,nodev "$p_blockdev" "$p_mountpoint"
fi

if [ -n "$p_nfs" ]
then
	umount="$p_mountpoint"
	mount -rt nfs "$p_nfs" -o nosuid,nodev "$p_mountpoint"
fi

predep="$vardir/predep-package"
while true
do
	set +e
	dpkg --admindir "$vardir" --predep-package >"$predep"
	rc=$?
	set -e
	if test $rc = 1; then break; fi
	test $rc = 0

	perl -e '
		($binaryprefix,$predep) = @ARGV;
		$binaryprefix =~ s,/*$,/, if length($binaryprefix);
		open(P, "< $predep") or die "cannot open $predep: $!\n";
		while (<P>) {
			s/\s*\n$//;
			$package= $_ if s/^Package: //i;
			@filename= split(/ /,$_) if s/^Filename: //i;
			@msdosfilename= split(/ /,$_) if s/^MSDOS-Filename: //i;
		}
		die "internal error - no package" if length($package) == 0;
		die "internal error - no filename" if not @filename;
		die "internal error - mismatch >@filename< >@msdosfilename<"
			if @filename && @msdosfilename &&
			   @filename != @msdosfilename;
		@invoke=(); $|=1;
		for ($i=0; $i<=$#filename; $i++) {
			$ppart= $i+1;
			print "Looking for part $ppart of $package ... ";
			if (-f "$binaryprefix$filename[$i]") {
				$print= $filename[$i];
				$invoke= "$binaryprefix$filename[$i]";
			} elsif (-f "$binaryprefix$msdosfilename[$i]") {
				$print= $msdosfilename[$i];
				$invoke= "$binaryprefix$msdosfilename[$i]";
			} else {
				$base= $filename[$i]; $base =~ s,.*/,,;
				$msdosbase= $msdosfilename[$i]; $msdosbase =~ s,.*/,,;
				$c = open(X, "-|"));
				if (not defined $c) {
					die "failed to fork for find: $!\n";
				}
				if (!$c) {
					exec("find", "-L",
					     length($binaryprefix) ?
					     $binaryprefix : ".",
					     "-name",$base,"-o","-name",$msdosbase);
					die "failed to exec find: $!\n";
				}
				while (chop($invoke= <X>)) { last if -f $invoke; }
				$print= $invoke;
				if (substr($print,0,length($binaryprefix)+1) eq
				    "$binaryprefix/") {
					$print= substr($print,length($binaryprefix));
				}
			}
			if (!length($invoke)) {
				warn "

Oh dear, I need to install or upgrade $package, but I don'\''t see
the appropriate file(s) anywhere.  I'\''m expecting version $version or
later, as that is listed in the Packages file.

Perhaps you downloaded it with an unexpected name, or something.
In any case, you must find the file(s) and then either place it with
the correct filename(s) (as listed in the Packages file or in
$vardir/available) and rerun the installation, or upgrade the
package by using '\''dpkg --install --auto-deconfigure'\'' by hand.

";
				exit(1);
			}
			print "$print\n";
			push(@invoke,$invoke);
		}
		print "Running dpkg -iB for $package ...\n";
		exec("dpkg","--admindir",$vardir,"-iB","--",@invoke);
		die "failed to exec dpkg: $!\n";
	' -- "$p_mountpoint$p_main_binary" "$predep"
done

for f in main ctb nf lcl
do
	eval 'this_binary=$p_'$f'_binary'
	if [ -z "$this_binary" ]; then continue; fi
	echo Running dpkg --admindir $vardir -iGROEB "$p_mountpoint$this_binary"
	dpkg --admindir $vardir -iGROEB "$p_mountpoint$this_binary"
done

echo -n 'Installation OK.  Hit RETURN.  '
read response

xit=0