#! @PERL@ -w## Written by Adam Byrtek <alpha@debian.org>, 2002## extfs to handle patches in context and unified diff formatuse bytes;use strict;use POSIX;# standard binariesmy $bzip = 'bzip2';my $gzip = 'gzip';my $file = 'file';# date parsing requires Date::Parse from TimeDate modulemy $parsedates = eval "require Date::Parse";# regular expressionsmy $unified_header=qr/^--- .*\n\+\+\+ .*\n@@ .* @@.*\n$/;my $unified_extract=qr/^--- ([^\s]+).*\n\+\+\+ ([^\s]+)\s*([^\t\n]*)/;my $unified_contents=qr/^([+\- \n]|@@ .* @@)/;my $context_header=qr/^\*\*\* .*\n--- .*\n\*{15}\n$/;my $context_extract=qr/^\*\*\* ([^\s]+).*\n--- ([^\s]+)\s*([^\t\n]*)/;my $context_contents=qr/^([!+\- \n]|-{3} .* -{4}|\*{3} .* \*{4}|\*{15})/;my $ls_extract_id=qr/^[^\s]+\s+[^\s]+\s+([^\s]+)\s+([^\s]+)/;my $basename=qr|^(.*/)*([^/]+)$|;# output unix date in a mc-readable formatsub timef{    my @time=localtime($_[0]);    return sprintf "%02d-%02d-%02d %02d:%02d", $time[4]+1, $time[3],		   $time[5]+1900, $time[2], $time[1];}# parse given string as a date and return unix timesub datetime{    # in case of problems fall back to 0 in unix time    # note: str2time interprets some wrong values (eg. " ") as 'today'    if ($parsedates && defined (my $t=str2time($_[0]))) {	return timef($t);    }    return timef(time);}# print message on stderr and exitsub error{    print STDERR $_[0], "\n";    exit 1;}# list files affected by patchsub list{    my ($archive)=(quotemeta $_[0]);    my ($state,$pos,$len,$time);    my ($f,$fsrc,$fdst,$prefix);    my ($unified,$context)=(0,0);    # use uid and gid from file    my ($uid,$gid)=(`ls -l $archive`=~/$ls_extract_id/);    import Date::Parse if ($parsedates);        # state==1 means diff contents, state==0 means comments    $state=0; $len=0; $f='';    while (<I>) {	# recognize diff type	if (!$unified && !$context) {	    $unified=1 if (/^--- /);	    $context=1 if (/^\*\*\* /);	    if (!$unified && !$context) {		$len+=length;		next;	    }	}	if (($unified && /^--- /) || ($context && /^\*\*\* [^\*]*$/)) {	    # start of new file	    if ($state==1) {		printf "-rw-r--r-- 1 %s %s %d %s %s%s\n", $uid, $gid, $len, datetime($time), $prefix, $f		  if $f;		$len=0;	    }	    $state=1;	    # parse diff header	    if ($unified) {		error "Can't parse unified diff header"		  unless ((($_.=<I>).=<I>)=~/$unified_header/);		($fsrc,$fdst,$time)=/$unified_extract/;	    } elsif ($context) {		error "Can't parse context diff header"		  unless ((($_.=<I>).=<I>)=~/$context_header/);		($fsrc,$fdst,$time)=/$context_extract/;	    }	    # select filename, conform with (diff.info)Multiple patches	    $prefix="";	    if (!$fdst && !$fsrc) {		error 'Index: not yet implemented';	    } elsif (!$fsrc || $fsrc eq '/dev/null') {		$f=$fdst; $prefix="PATCH-CREATE/";	    } elsif (!$fdst || $fdst eq '/dev/null') {		$f=$fsrc; $prefix="PATCH-REMOVE/";	    } elsif (($fdst eq "/dev/null") && ($fsrc eq "/dev/null")) {		error "Malformed diff";	    } else {		# fewest path name components		if ($fdst=~s|/|/|g < $fsrc=~s|/|/|g) {		    $f=$fdst;		} elsif ($fdst=~s|/|/|g > $fsrc=~s|/|/|g) {		    $f=$fsrc;		} else {		    # shorter base name		    if (($fdst=~/$basename/,length $2) < ($fsrc=~/$basename/,length $2)) {			$f=$fdst;		    } elsif (($fdst=~/$basename/,length $2) > ($fsrc=~/$basename/,length $2)) {			$f=$fsrc;		    } else {			# shortest names			if (length $fdst < length $fsrc) {			    $f=$fdst;			} else {			    $f=$fsrc;			}		    }		}	    }	    $f=$f.".diff";	} elsif ($state==1 && (($unified && !/$unified_contents/) || ($context && !/$context_contents/))) {	    # start of comments, end of diff contents	    printf "-rw-r--r-- 1 %s %s %d %s %s%s\n", $uid, $gid, $len, datetime($time), $prefix, $f	      if $f;	    $state=$len=0;	}	$len+=length;    }    printf "-rw-r--r-- 1 %s %s %d %s %s%s\n", $uid, $gid, $len, datetime($time), $prefix, $f      if $f;}# extract diff from patchsub copyout{    my ($file,$out)=@_;    my ($fsrc,$fdst,$found,$state,$buf);    my ($unified,$context)=(0,0);    $file=~s/^(PATCH-(CREATE|REMOVE)\/)?(.*)\.diff$/$3/;        # state==1 means diff contents, state==0 mens comments    $state=0; $found=0; $buf='';    while (<I>) {	# recognize diff type	if (!$unified && !$context) {	    $unified=1 if (/^--- /);	    $context=1 if (/^\*\*\* /);	    if (!$unified && !$context) {		$buf.=$_;		next;	    }	}	if (($unified && /^--- /) || ($context && /^\*\*\* [^\*]*$/)) {	    last if ($state==1 && $found);	    $state=1;	    # parse diff header	    if ($unified) {		error "Can't parse unified diff header"		  unless ((($_.=<I>).=<I>)=~/$unified_header/);		($fsrc,$fdst)=/$unified_extract/;	    } elsif ($context) {		error "Can't parse context diff header"		  unless ((($_.=<I>).=<I>)=~/$context_header/);		($fsrc,$fdst)=/$context_extract/;	    }	    $found=1 if (($fsrc eq $file) || ($fdst eq $file));	} elsif ($state==1 && (($unified && !/$unified_contents/) || ($context && !/$context_contents/))) {	    # start of comments, end of diff contents	    last if ($found);	    $state=0;	    $buf="";	}	$buf.=$_ if ($found || $state==0)    }    if ($found) {	open O, "> $out";	print O $buf;	close O;    }}# append diff to archivesub copyin{    my ($archive,$name,$f)=(quotemeta $_[0],$_[1],quotemeta $_[2]);    my ($cmd);    error "File must have .diff or .patch extension"      unless $name=~/\.(diff|patch)(\.(bz|bz2|gz|z|Z))?$/;    $_=`$file $f`;    if (/bzip/) {	$cmd="$bzip -dc $f";    } elsif (/gzip/) {	$cmd="$gzip -dc $f";    } else {	$cmd="cat $f";    }    $_=`$file $archive`;    if (/bzip/) {	system "$cmd | $bzip -c >> $archive";    } elsif (/gzip/) {	system "$cmd | $gzip -c >> $archive";    } else {	system "$cmd >> $archive";    }}# open (compressed) archive for readingsub openread{    my ($archive) = (quotemeta $_[0]);    $_=`$file $archive`;    if (/bzip/) {	open I, "$bzip -dc $archive |";    } elsif (/gzip/) {	open I, "$gzip -dc $archive |";    } else {	open I, "< $ARGV[1]";    }}if ($ARGV[0] eq 'list') {    openread $ARGV[1];    list $ARGV[1];    exit 0;} if ($ARGV[0] eq 'copyout') {    openread $ARGV[1];    copyout ($ARGV[2], $ARGV[3]);    exit 0;} if ($ARGV[0] eq 'copyin') {    copyin ($ARGV[1], $ARGV[2], $ARGV[3]);    exit 0;}exit 1;