1#!/usr/bin/perl -w
2
3
4# p4genpatch - Generate a perl patch from the repository
5
6# Usage: $0 -h
7
8# andreas.koenig@anima.de
9
10use strict;
11use File::Temp qw(tempdir);
12use File::Compare;
13use File::Spec;
14use File::Spec::Unix;
15use Time::Local;
16use Getopt::Long;
17use Cwd qw(cwd);
18
19sub correctmtime ($$$);
20sub Usage ();
21
22$0 =~ s|^.*[\\/]||;
23my $VERSION = '0.05';
24my $TOPDIR = cwd();
25my @P4opt;
26our %OPT = ( "d" => "u", b => "//depot/perl/", "D" => "diff" );
27Getopt::Long::Configure("no_ignore_case");
28GetOptions(\%OPT, "b=s", "p=s", "d=s", "D=s", "h", "v", "V") or die Usage;
29print Usage and exit if $OPT{h};
30print "$VERSION\n" and exit if $OPT{V};
31die Usage unless @ARGV == 1 && $ARGV[0] =~ /^\d+$/;
32my $CHANGE = shift;
33
34for my $p4opt (qw(p)) {
35  push @P4opt, "-$p4opt $OPT{$p4opt}" if $OPT{$p4opt};
36}
37
38my $system = "p4 @P4opt describe -s $CHANGE |";
39open my $p4, $system or die "Could not run $system";
40my @action;
41while (<$p4>) {
42  print;
43  next unless m|($OPT{b})|;
44  my($prefix) = $1;
45  $prefix =~ s|/$||;
46  $prefix =~ s|/[^/]+$||; # up to the last "/" in the match is to be stripped
47  if (my($file,$action) = m|^\.\.\. (//depot.*)\s(\w+)$|) {
48    next if $action eq "delete";
49    push @action, [$action, $file, $prefix];
50  }
51}
52close $p4;
53
54my $tempdir;
55my @unlink;
56print "Differences ...\n";
57for my $a (@action) {
58  $tempdir ||= tempdir( "tmp-XXXX", CLEANUP => 1, TMPDIR => 1 );
59  @unlink = ();
60  my($action,$file,$prefix) = @$a;
61  my($path,$basename,$number) = $file =~ m|\Q$prefix\E/(.+/)?([^/]+)#(\d+)|;
62
63  my @splitdir = File::Spec::Unix->splitdir($path);
64  $path = File::Spec->catdir(@splitdir);
65
66  my($depotfile) = $file =~ m|^(.+)#\d+\z|;
67  die "Panic: Could not parse file[$file]" unless $number;
68  $path = "" unless defined $path;
69  my($d1,$d2,$prev,$prevchange,$prevfile,$doadd,$t1,$t2);
70  $prev = $number-1;
71  $prevchange = $CHANGE-1;
72  # can't assume previous rev == $number-1 due to obliterated revisions
73  $prevfile = "$depotfile\@$prevchange";
74  if ($number == 1 or $action =~ /^(add|branch)$/) {
75    $d1 = $^O eq 'MacOS' ? File::Spec->devnull : "/dev/null";
76    $t1 = $d1;
77    ++$doadd;
78  } elsif ($action =~ /^(edit|integrate)$/) {
79    $d1 = File::Spec->catfile($path, "$basename-$prevchange");
80    $t1 = File::Spec->catfile($tempdir, $d1);
81    warn "==> $d1 <==\n" if $OPT{v};
82    my $system = qq[p4 @P4opt print -o "$t1" "$prevfile"];
83    my $status = `$system`;
84    if ($?) {
85      warn "$0: system[$system] failed, status[$?]\n";
86      next;
87    }
88    chmod 0644, $t1;
89    if ($status =~ /\#(\d+) \s - \s \w+ \s change \s (\d+) \s /x) {
90      ($prev,$prevchange) = ($1,$2);
91      $prevfile = "$depotfile#$prev";
92      my $oldd1 = $d1;
93      $d1 =~ s/-\d+$/#$prev~$prevchange~/;
94      my $oldt1 = $t1;
95      $t1 = File::Spec->catfile($tempdir, $d1);
96      rename $oldt1, $t1;
97    }
98    push @unlink, $t1;
99  } else {
100    die "Unknown action[$action]";
101  }
102  $d2 = File::Spec->catfile($path, $basename);
103  $t2 = File::Spec->catfile($tempdir, $d2);
104  push @unlink, $t2;
105  warn "==> $d2#$number <==\n" if $OPT{v};
106  my $system = qq[p4 @P4opt print -o "$t2" "$file"];
107  # warn "system[$system]";
108  my $type = `$system`;
109  if ($?) {
110    warn "$0: `$system` failed, status[$?]\n";
111    next;
112  }
113  chmod 0644, $t2;
114  $type =~ m|^//.*\((.+)\)$| or next;
115  $type = $1;
116  if ($doadd or File::Compare::compare($t1, $t2)) {
117    print "\n==== $file ($type) ====\n";
118    unless ($type =~ /text/) {
119      next;
120    }
121    unless ($^O eq 'MacOS') {
122      $d1 =~ s,\\,/,g;
123      $d2 =~ s,\\,/,g;
124    }
125    print "Index: $d2\n";
126    correctmtime($prevfile,$prev,$t1) unless $doadd;
127    correctmtime($file,$number,$t2);
128    chdir $tempdir or warn "Could not chdir '$tempdir': $!";
129    $system = qq[$OPT{D} -$OPT{d} "$d1" "$d2"];
130    system($system); # no return check because diff doesn't always return 0
131    chdir $TOPDIR or warn "Could not chdir '$TOPDIR': $!";
132  }
133}
134continue {
135  for (@unlink) {
136    unlink or warn "Could not unlink $_: $!" if -f;
137  }
138}
139print "End of Patch.\n";
140
141my($tz_offset);
142sub correctmtime ($$$) {
143  my($depotfile,$nr,$localfile) = @_;
144  my %fstat = map { /^\.\.\. (\w+) (.*)$/ } `p4 @P4opt fstat -s "$depotfile"`;
145  return unless exists($fstat{headRev}) and $fstat{headRev} == $nr;
146
147  if ($^O eq 'MacOS') {  # fix epoch ... still off by three hours (EDT->PDT)
148    require Time::Local;
149    $tz_offset ||= sprintf "%+0.4d\n", (
150      Time::Local::timelocal(localtime) - Time::Local::timelocal(gmtime)
151    );
152    $fstat{headTime} += 2082844801 + $tz_offset;
153  }
154
155  utime $fstat{headTime}, $fstat{headTime}, $localfile;
156}
157
158sub Usage () {
159    qq{Usage: $0 [OPTIONS] patchnumber
160
161      -p host:port    p4 port (e.g. myhost:1666)
162      -d diffopt      option to pass to diff(1)
163      -D diff         diff(1) to use
164      -b branch(es)   which branches to include (regex); the last
165                      directory within the matched part will be
166                      preserved on the local copy, so that patch -p1
167                      will work (default: "//depot/perl/")
168      -v              verbose
169      -h              print this help and exit
170      -V              print version number and exit
171
172Fetches all required files from the repository, puts them into a
173temporary directory with sensible names and sensible modification
174times and composes a patch to STDOUT using external diff command.
175Requires repository access.
176
177Examples:
178          perl $0 12345 | gzip -c > 12345.gz
179          perl $0 -dc 12345 > change-12345.patch
180          perl $0 -b //depot/maint-5.6/perl -v 8571 > 8571
181};
182}
183