#!@PERL@ -w
# @configure_input@
#
# Automatic generation of BuildRequires dependencies for rpmbuild.
# Copyright (C) 2008 Red Hat Inc.
# Written by Richard W.M. Jones <rjones@redhat.com>
#
# 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, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

use strict;

use String::ShellQuote;
use File::Temp qw(tempfile);

if (@ARGV != 1) {
    die "auto-br-analyze: logfile parameter missing\n";
}

my %files;

my $homedir = $ENV{HOME};

open LOG, "<$ARGV[0]" or die ($ARGV[0], ": $!\n");

while (<LOG>) {
    if (/^(open|execve) (.+)/) {
	my $file = $2;

	# Ignore files which don't exist, and files located in some
	# places we ignore (eg. under $HOME).
	my ($dev, $ino, $mode) = stat $file;
	next unless defined $dev;
	next if $homedir && $file =~ /^$homedir/;

        # ./configure opens every file in /etc/ld.so.conf, pulling
        # in lots of false dependencies.
        next if $file =~ m{^/etc/ld\.so\.conf\.d/.*\.conf$};

	$files{$file} = 1;
    }
}

close LOG;

# Work out which RPM packages are used.  Note we don't care about
# which specific file is owned by which specific package, which allows
# us to do a lot of nice shell magic for the hard work here.
my @owners;

my ($fh, $filename) = tempfile ();

my $cmd =
    "export LANG=C; ".
    "xargs -0 ".
    "rpm -q --qf '%{name} %{epoch} %{version} %{release} %{arch}\n' -f ".
    "2>&1 | ".
    "grep -v '^file.*is not owned by any package\$' | ".
    "grep -v '^error:' | ".
    "sort -u > $filename";
open PIPE, "| $cmd" or die "$cmd: $!";
print PIPE "$_\0" foreach (sort keys %files);
close PIPE;

while (<$fh>) {
    if (/^(\S+) (\d+|\(none\)) (\S+) (\S+) (\S+)$/) {
	my ($rpm, $epoch, $version, $release, $arch) =
	    ($1, $2, $3, $4, $5);
	$epoch = "0" if $epoch eq "(none)";
	push @owners, {
	    rpm => $rpm,
	    epoch => $epoch, version => $version, release => $release,
	    arch => $arch
	}
    } else {
	die "rpm: $_"
    }
}

# Print the list of BuildRequires.

foreach (@owners) {
    my $rpm = $_->{rpm};
    my $epoch = $_->{epoch};
    my $version = $_->{version};
    my $release = $_->{release};
    my $arch = $_->{arch};

    # Ignore 'rpm', 'rpm-build' and a few others which are introduced
    # by the rpmbuild system itself.
    next if $rpm eq "rpm" || $rpm eq "rpm-build" || $rpm eq "python"
	|| $rpm eq "redhat-rpm-config";

    print "BuildRequires: $rpm = ";
    if ($epoch != 0) {
	print "$epoch:";
    }
    print "$version.$release.$arch\n";
}