difftool: only copy back files modified during directory diff

When 'difftool --dir-diff' is used to compare working tree files,
it always copies files from the tmp dir back to the working tree
when the diff tool is closed, even if the files were not modified
by the diff tool.

This causes the file timestamp to change. Files should only be
copied from the tmp dir back to the working copy if they were
actually modified.

Signed-off-by: Tim Henigan <tim.henigan@gmail.com>
Signed-off-by: David Aguilar <davvid@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/git-difftool.perl b/git-difftool.perl
index ae1e0525d89181f8adbe288b62e107b8dadb8ca1..c0798540adee04cb7cfb6fd04ef3541a1fcbb762 100755 (executable)
--- a/git-difftool.perl
+++ b/git-difftool.perl
@@ -15,6 +15,7 @@
 use warnings;
 use File::Basename qw(dirname);
 use File::Copy;
+use File::Compare;
 use File::Find;
 use File::stat;
 use File::Path qw(mkpath);
@@ -336,8 +337,10 @@ sub write_to_file
        # files were modified during the diff, then the changes
        # should be copied back to the working tree
        for my $file (@working_tree) {
-               copy("$b/$file", "$workdir/$file") or die $!;
-               chmod(stat("$b/$file")->mode, "$workdir/$file") or die $!;
+               if (-e "$b/$file" && compare("$b/$file", "$workdir/$file")) {
+                       copy("$b/$file", "$workdir/$file") or die $!;
+                       chmod(stat("$b/$file")->mode, "$workdir/$file") or die $!;
+               }
        }
 } else {
        if (defined($prompt)) {