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#!/usr/bin/perl -w
use strict;
# sets mtime and atime of files to the latest commit time in git
#
# This is useful for serving static content (managed by git)
# from a cluster of identically configured HTTP servers. HTTP
# clients and content delivery networks can get consistent
# Last-Modified headers no matter which HTTP server in the
# cluster they hit. This should improve caching behavior.
#
# This does not take into account merges, but if you're updating
# every machine in the cluster from the same commit (A) to the
# same commit (B), the mtimes will be _consistent_ across all
# machines if not necesarily accurate.
#
# THIS IS NOT INTENDED TO OPTIMIZE BUILD SYSTEMS SUCH AS 'make'
# YOU HAVE BEEN WARNED!
my %ls = ();
my $commit_time;
$/ = "\0";
open FH, 'git ls-files -z|' or die $!;
while (<FH>) {
chomp;
$ls{$_} = $_;
}
close FH;
$/ = "\n";
open FH, "git log -r --name-only --no-color --pretty=raw -z @ARGV |" or die $!;
while (<FH>) {
chomp;
if (/^committer .*? (\d+) (?:[\-\+]\d+)$/) {
$commit_time = $1;
} elsif (s/\0\0commit [a-f0-9]{40}$// or s/\0$//) {
my @files = delete @ls{split(/\0/, $_)};
@files = grep { defined $_ } @files;
next unless @files;
utime $commit_time, $commit_time, @files;
}
last unless %ls;
}
close FH;
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