[PATCH 1/3] difftool: sanitize $workdir as early as possible

[David Aguilar <davvid@gmail.com>]

The double-slash fixup on the $workdir variable was being
performed just-in-time to avoid double-slashes in symlink
targets, but the rest of the code was silently using paths with
embedded "//" in them.

A recent user-reported error message contained double-slashes.
Eliminate the issue by sanitizing inputs as soon as they arrive.

Signed-off-by: David Aguilar <davvid@gmail.com>
---
 git-difftool.perl | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/git-difftool.perl b/git-difftool.perl
index 959822d5f3..17c336321f 100755
--- a/git-difftool.perl
+++ b/git-difftool.perl
@@ -224,9 +224,7 @@ EOF
 	delete($ENV{GIT_INDEX_FILE});
 
 	# Changes in the working tree need special treatment since they are
-	# not part of the index. Remove any trailing slash from $workdir
-	# before starting to avoid double slashes in symlink targets.
-	$workdir =~ s|/$||;
+	# not part of the index.
 	for my $file (@working_tree) {
 		my $dir = dirname($file);
 		unless (-d "$rdir/$dir") {
@@ -389,6 +387,7 @@ sub dir_diff
 	my $repo = Git->repository();
 	my $repo_path = $repo->repo_path();
 	my $workdir = $repo->wc_path();
+	$workdir =~ s|/$||; # Avoid double slashes in symlink targets
 	my ($a, $b, $tmpdir, @worktree) = setup_dir_diff($workdir, $symlinks);
 
 	if (defined($extcmd)) {
-- 
2.11.0.26.gb65c994