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#!/usr/bin/perl -w
# diffstat-total-compare.plx -*- Perl -*-
# Copyright (C) 2013 Bradley M. Kuhn <>
# This software's license gives you freedom; you can copy, convey,
# propogate, redistribute and/or modify this program under the terms of
# the GNU General Public License (GPL) as published by the Free
# Software Foundation (FSF), either version 3 of the License, or (at your
# option) any later version of the GPL published by the FSF.
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program in a file in the toplevel directory called
# "GPLv3". If not, see <>.
# The problem this script is trying to solve:
# You have a source release separated from the a git repository.
# Non-hypothetical example: a CCS release from a GPL compliance source dump
# from a cmopany.
# You want to know the git revision it's closest to.
# Well, the only way I've found to solve this problem is this way:
# build a list of commit ids that are the candidates for the base revision
# for this sort release, and put them in commit-list, one per line, and run:
# for i in `cat commit-list `; do
# echo Doing $i
# git checkout -q $i; diff -wB -N -x .git -ru . /path/to/source/release > /path/to/diffs/${i}.log
# cat /path/to/diffs/${i}.log |diffstat > /path/to/diffs//${i}.diffstat
# rm /path/to/diffs/${i}.log
# echo Done $i
# done
# Then, this script is run across that directory.
my %commitTotals;
for my $file (<*.diffstat>) {
my $commitID = $file;
$commitID =~ s/\.diffstat$// or die "$file isn't ending in .diffstat, huh?";
my %commit;
open(DIFFSTAT, "<", $file) or die "unable to open $file for reading: $!";
while (my $line = <DIFFSTAT>) {
if ($line =~ /^\s*(\d+)\s*files\s+changed\s*,\s*(\d+)\s*insertion[^\d]+\s+(\d+)\s*deletion.*$/) {
($commit{files}, $commit{insertions}, $commit{deletions}) = ($1, $2, $3);
die "unable to find diffstat summary line in $file"
unless defined $commit{files} and defined $commit{insertions}
and defined $commit{deletions};
close DIFFSTAT; die "error reading $file: $!" unless ($? == 0);
$commit{totalLines} = $commit{insertions} + $commit{deletions};
$commitTotals{$commitID} = \%commit;
foreach my $type (qw/files insertions deletions totalLines/) {
print "Sorted by $type:\n";
foreach my $commitID (
sort { $commitTotals{$a}{$type} <=> $commitTotals{$b}{$type} }
keys %commitTotals) {
print " $commitID $commitTotals{$commitID}{$type}\n";
# Local variables:
# compile-command: "perl -c diffstat-total-compare.plx"
# End: