support/patch-update

   1 #!/usr/bin/perl -w
   2 # This script is used to turn one or more of the "patch/*" branches
   3 # into one or more diffs in the "patches" directory.  Pass the option
   4 # --gen if you want generated files in the diffs.  Pass the name of
   5 # one or more diffs if you want to just update a subset of all the
   6 # diffs.
   7
   8 use strict;
   9 use Getopt::Long;
  10
  11 my $patches_dir = 'patches';
  12 my $tmp_dir = "patches.$$";
  13
  14 &Getopt::Long::Configure('bundling');
  15 &usage if !&GetOptions(
  16     'skip-check' => \( my $skip_branch_check ),
  17     'gen:s' => \( my $incl_generated_files ),
  18     'help|h' => \( my $help_opt ),
  19 );
  20 &usage if $help_opt;
  21
  22 if (defined $incl_generated_files) {
  23     $patches_dir = $incl_generated_files if $incl_generated_files ne '';
  24     $incl_generated_files = 1;
  25 }
  26
  27 die "No '$patches_dir' directory was found.\n" unless -d $patches_dir;
  28 die "No '.git' directory present in the current dir.\n" unless -d '.git';
  29
  30 open(IN, '-|', 'git status') or die $!;
  31 my $status = join('', <IN>);
  32 close IN;
  33 unless ($skip_branch_check) {
  34     die "The checkout is not clean:\n", $status unless $status =~ /\nnothing to commit \(working directory clean\)/;
  35 }
  36 my($starting_branch) = $status =~ /^# On branch (.+)\n/;
  37
  38 my @extra_files;
  39 open(IN, '<', 'Makefile.in') or die "Couldn't open Makefile.in: $!\n";
  40 while (<IN>) {
  41     if (s/^GENFILES=//) {
  42         while (s/\\$//) {
  43             $_ .= <IN>;
  44         }
  45         @extra_files = split(' ', $_);
  46         last;
  47     }
  48 }
  49 close IN;
  50
  51 if ($incl_generated_files) {
  52     die "'$tmp_dir' must not exist in the current directory.\n" if -e $tmp_dir;
  53     mkdir($tmp_dir, 0700) or die "Unable to mkdir($tmp_dir): $!\n";
  54     system "./config.status Makefile && make gen && rsync -a @extra_files $tmp_dir/master/" and exit 1;
  55 }
  56 my $last_touch = time;
  57
  58 my(@patches, %local_patch);
  59
  60 # Start by finding all patches so that we can load all possible parents.
  61 open(PIPE, '-|', 'git', 'branch', '-a') or die $!;
  62 while (<PIPE>) {
  63     if (m# origin/patch/(.*)#) {
  64         push(@patches, $1);
  65     } elsif (m# patch/(.*)#) {
  66         $local_patch{$1} = 1;
  67     }
  68 }
  69 close PIPE;
  70
  71 my(%parent, %description);
  72 foreach my $patch (@patches) {
  73     my $branch = ($local_patch{$patch} ? '' : 'origin/') . "patch/$patch";
  74     my $desc = '';
  75     open(PIPE, '-|', 'git', 'diff', '-U1000', "master...$branch", '--', "PATCH.$patch") or die $!;
  76     while (<PIPE>) {
  77         last if /^@@ /;
  78     }
  79     while (<PIPE>) {
  80         next unless s/^[ +]//;
  81         if (m#patch -p1 <patches/(\S+)\.diff# && $1 ne $patch) {
  82             $parent{$patch} = $1;
  83         }
  84         $desc .= $_;
  85     }
  86     $description{$patch} = $desc;
  87 }
  88
  89 if (@ARGV) {
  90     # Limit the list of patches to actually process based on @ARGV.
  91     @patches = ( );
  92     foreach (@ARGV) {
  93         s{^(patches|patch|origin/patch)/} {};
  94         s{\.diff$} {};
  95         push(@patches, $_);
  96     }
  97 }
  98
  99 my %completed;
 100 foreach my $patch (@patches) {
 101     next if $completed{$patch}++;
 102     update_patch($patch);
 103 }
 104
 105 if ($incl_generated_files) {
 106     system "rm -rf $tmp_dir";
 107 }
 108
 109 sleep 1 if $last_touch == time;
 110 system "git checkout $starting_branch" and exit 1;
 111
 112 exit;
 113
 114
 115 sub update_patch
 116 {
 117     my($patch) = @_;
 118
 119     my $parent = $parent{$patch};
 120     if (defined $parent) {
 121         unless ($completed{$parent}++) {
 122             update_patch($parent);
 123         }
 124         $parent = "patch/$parent";
 125     } else {
 126         $parent = 'master';
 127     }
 128
 129     print "======== $patch ========\n";
 130
 131     sleep 1 if $incl_generated_files && $last_touch == time;
 132     if ($local_patch{$patch}) {
 133         system "git checkout patch/$patch" and exit 1;
 134     } else {
 135         system "git checkout --track -b patch/$patch origin/patch/$patch" and exit 1;
 136     }
 137
 138     open(OUT, '>', "$patches_dir/$patch.diff") or die $!;
 139     print OUT $description{$patch}, "\n";
 140
 141     if (system("git merge $parent") != 0) {
 142         print qq|"git merge $parent" incomplete -- please fix.\n|;
 143         $ENV{PS1} = "[$parent] patch/$patch: ";
 144         system $ENV{SHELL} and exit 1;
 145     }
 146
 147     if ($incl_generated_files) {
 148         system "./config.status Makefile && make gen && rsync -a @extra_files $tmp_dir/$patch/" and exit 1;
 149     }
 150     $last_touch = time;
 151
 152     open(PIPE, '-|', 'git', 'diff', $parent) or die $!;
 153     DIFF: while (<PIPE>) {
 154         while (m{^diff --git a/PATCH}) {
 155             while (<PIPE>) {
 156                 last if m{^diff --git a/};
 157             }
 158             last DIFF if !defined $_;
 159         }
 160         next if /^index /;
 161         print OUT $_;
 162     }
 163     close PIPE;
 164
 165     if ($incl_generated_files) {
 166         $parent =~ s#.*/##;
 167         open(PIPE, '-|', 'diff', '-up', "$tmp_dir/$parent", "$tmp_dir/$patch") or die $!;
 168         while (<PIPE>) {
 169             s#^(diff -up) $tmp_dir/[^/]+/(.*?) $tmp_dir/[^/]+/(.*)#$1 a/$2 b/$3#o;
 170             s#^\Q---\E $tmp_dir/[^/]+/([^\t]+)\t.*#--- a/$1#o;
 171             s#^\Q+++\E $tmp_dir/[^/]+/([^\t]+)\t.*#+++ b/$1#o;
 172             print OUT $_;
 173         }
 174         close PIPE;
 175     }
 176
 177     close OUT;
 178 }
 179
 180 exit;
 181
 182 sub usage
 183 {
 184     die <<EOT;
 185 Usage: patch-update [OPTIONS]
 186
 187 --gen[=DIR]   Include generated files.  Optional dest DIR overrides "patches".
 188 --skip-check  Skip the check that ensures starting with a clean branch.
 189 EOT
 190 }