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|
#!/usr/bin/perl
use strict;
my $SRC = shift;
my $LINUX = shift;
my $CONF = shift;
$SRC = "." if !defined($SRC);
$LINUX = "/usr/src/linux" if !defined($LINUX);
$CONF = "$SRC/.buildpatch" if !defined($CONF);
my ($VERSION,$CODE) = &kernel_version;
my $DEBUG = 0;
#################################################################
# helpers
sub readfile ($) {
my ($filename) = @_;
my $file;
open FILE, "<$filename" or
die "can't open file $filename: $!";
{ local $/; undef $/; $file = <FILE> }
close FILE;
return $file;
}
sub kernel_version() {
my $makefile = readfile("$LINUX/Makefile");
my (@ver,$ver,$code);
@ver = (); $code = 0;
foreach my $name ("VERSION", "PATCHLEVEL", "SUBLEVEL") {
$makefile =~ /$name = (\d+)/ or die;
$code = $code * 256 + $1;
push @ver,$1;
}
$ver = join(".",@ver);
$makefile =~ /EXTRAVERSION = (\S+)/ and $ver .= "$1";
return ($ver,$code);
}
#################################################################
# filter out version-specific code
sub filter_source ($$) {
my ($in,$out) = @_;
my ($line,$if,$state,$mmkernel);
if (-e $LINUX . "/.mm") {
$mmkernel = 1;
} else {
$mmkernel = 0;
}
open IN, "<$in";
open OUT, ">$out";
while ($line = <IN>) {
die "nested" if defined($state) && $line =~ /^#if/;
if ($line =~ m/^#include <linux\/version.h>/ &&
$in =~ m/.*\.c/) {
next;
}
if ($line =~ m/^#include \"compat.h\"/) {
next;
}
if ($line =~ m/[\$]Id:.*/) {
next;
}
if ($line =~ /^#ifdef MM_KERNEL/) {
chomp($line);
$state = "if";
$if = $mmkernel;
print OUT "/* BP #if $if ($line) */\n" if $DEBUG;
next;
}
if ($line =~ /^#if 0/) {
chomp($line);
$state = "if";
$if = 0;
print OUT "/* BP #if $if ($line) */\n" if $DEBUG;
next;
}
if ($line =~ /^#if 1 .*KEEP.*/) {
print OUT "#if 1\n";
next;
}
if ($line =~ /^#if 1/) {
chomp($line);
$state = "if";
$if = 1;
print OUT "/* BP #if $if ($line) */\n" if $DEBUG;
next;
}
if ($line =~ /^#if.*BTTV_VERSION_CODE/) {
chomp($line);
$state = "if";
$line =~ s@^#if\s*@@;
$line =~ s@BTTV_VERSION_CODE@\$CODE@;
$line =~ s@KERNEL_VERSION\((\d+),\s*(\d+),\s*(\d+)\)@
sprintf("%d",$1*65536 + $2*256 + $3) @e;
$if = eval $line;
print OUT "/* BP #if $if ($line) */\n" if $DEBUG;
next;
}
if ($line =~ /^#if.*LINUX_VERSION_CODE/) {
chomp($line);
$line =~ s@^#if\s*@@;
$line =~ s@LINUX_VERSION_CODE@\$CODE@;
$line =~ s@KERNEL_VERSION\((\d+),\s*(\d+),\s*(\d+)\)@
sprintf("%d",$1*65536 + $2*256 + $3) @e;
$if = eval $line;
$state = "if";
print OUT "/* BP #if $if ($line) */\n" if $DEBUG;
next;
}
if (defined($state) && $line =~ /^#else/) {
$state = "else";
print OUT "/* BP #else */\n" if $DEBUG;
next;
}
if (defined($state) && $line =~ /^#endif/) {
undef $state;
print OUT "/* BP #endif */\n" if $DEBUG;
next;
}
if (!defined($state) ||
$state eq "if" && $if ||
$state eq "else" && !$if) {
print OUT $line;
} else {
chomp($line);
print OUT "/* BP DEL $line */\n" if $DEBUG;
}
}
close IN;
close OUT;
}
sub filter_dest ($$) {
my ($in,$out) = @_;
my ($line,$if,$state,$mmkernel);
if (-e $LINUX . "/.mm") {
$mmkernel = 1;
} else {
$mmkernel = 0;
}
open IN, "<$in";
open OUT, ">$out";
while ($line = <IN>) {
if ($line =~ m/[\$]Id:.*/) {
next;
}
print OUT $line;
}
close IN;
close OUT;
}
#################################################################
# build diffs
sub makediff ($$) {
my ($here,$kernel) = @_;
my ($line1,$line2,$file1,$file2);
my $tmp = "/tmp/src.$$";
my $tmp2 = "/tmp/dst.$$";
filter_source("../linux/$here","$tmp");
if (-f "$LINUX/$kernel") {
filter_dest("$LINUX/$kernel","$tmp2");
open DIFF, "diff -up $tmp2 $tmp|";
} else {
# new file
open DIFF, "diff -up /dev/null $tmp|";
}
# header
$line1 = <DIFF>;
$line1 =~ s@$LINUX@linux-$VERSION@;
$line1 =~ s@/dev/null@linux-$VERSION/$kernel@;
$file1 = $1 if $line1 =~ m/^\-\-\- (\S+)/;
$line2 = <DIFF>;
$line2 =~ s@$tmp@linux/$kernel@;
$file2 = $1 if $line2 =~ m/^\+\+\+ (\S+)/;
print "diff -u $file1 $file2\n"
if defined($file1) && defined($file2);
print $line1;
print $line2;
# body
{ local $/; undef $/; my $diff = <DIFF>; print $diff; }
close DIFF;
unlink $tmp;
}
sub delfile ($) {
my ($kernel) = @_;
my ($line);
return unless -f "$LINUX/$kernel";
open DIFF, "diff -u $LINUX/$kernel /dev/null|";
# header
$line = <DIFF>;
$line =~ s@$LINUX@linux-$VERSION@;
print $line;
$line = <DIFF>;
$line =~ s@/dev/null@linux/$kernel@;
print $line;
# body
{ local $/; undef $/; $line = <DIFF>; print $line; }
close DIFF;
}
#################################################################
# main
my $patchtmploc = "/tmp/temp.patch";
open(PATCHTMP, ">", $patchtmploc) || die("can't open tempfile: $!");
select(PATCHTMP);
printf STDERR <<EOF,$CODE;
kernel in $LINUX is $VERSION (0x%x)
EOF
open CONFIG,"$CONF" or
die "can't open file $CONF: $!";
while (my $line = <CONFIG>) {
$line =~ s/#.*//; # kill comments
next if $line =~ /^\s*$/; # empty line
if ($line =~ /srcdiff\s+(\S+)\s+(\S+)/) {
print STDERR "srcdiff $2\n";
makediff($2,$2);
} elsif ($line =~ /delete\s+(\S+)/) {
print STDERR "delete $1\n";
delfile($1);
} else {
die "Huh?: $line";
}
}
close(PATCHTMP);
select(STDOUT);
if (-s "$patchtmploc") {
system "diffstat -p0 -w72 $patchtmploc";
print "\n",readfile($patchtmploc);
unlink $patchtmploc;
}
|
