1#!/usr/bin/perl
2use strict;
3use 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
10my %ls;
11my $commit_time;
12my $prefix = @ARGV && $ARGV[0] =~ s/^--prefix=// ? shift : '';
13
14$/ = "\0";
15open FH, 'git ls-files -z|' or die $!;
16while (<FH>) {
17    chomp;
18    $ls{$_} = $_;
19}
20close FH;
21
22$/ = "\n";
23open FH, "git log -r --name-only --no-color --pretty=raw -z @ARGV |" or die $!;
24while (<FH>) {
25    chomp;
26    if (/^committer .*? (\d+) (?:[\-\+]\d+)$/) {
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}
37close FH;
38