support/git-set-file-times

   1 #!/usr/bin/perl
   2 use strict;
   3 use warnings;
   4
   5 # Sets mtime and atime of files to the latest commit time in git.
   6 #
   7 # This is useful after the first clone of the rsync repository BEFORE you
   8 # do any building.  It is also safe if you have done a "make distclean".
   9
  10 my %ls;
  11 my $commit_time;
  12 my $prefix = @ARGV && $ARGV[0] =~ s/^--prefix=// ? shift : '';
  13
  14 $/ = "\0";
  15 open FH, 'git ls-files -z|' or die $!;
  16 while (<FH>) {
  17     chomp;
  18     $ls{$_} = $_;
  19 }
  20 close FH;
  21
  22 $/ = "\n";
  23 open FH, "git log -r --name-only --no-color --pretty=raw -z @ARGV |" or die $!;
  24 while (<FH>) {
  25     chomp;
  26     if (/^committer .*? (\d+) (?:[\-\+]\d+)$/) {
  27         $commit_time = $1;
  28     } elsif (s/\0\0commit [a-f0-9]{40}$// or s/\0$//) {
  29         my @files = delete @ls{split(/\0/, $_)};
  30         @files = grep { defined $_ } @files;
  31         next unless @files;
  32         map { s/^/$prefix/ } @files;
  33         utime $commit_time, $commit_time, @files;
  34     }
  35     last unless %ls;
  36 }
  37 close FH;