John Keeping <john@xxxxxxxxxxxxx> writes:
> Commit 02c5631 (difftool --dir-diff: symlink all files matching the
> working tree, 2013-03-14) does not handle the case where a file that is
> being compared does not exist in the working tree. Fix this by checking
> for existence explicitly before running git-hash-object.
>
> Reported-by: Kevin Bracey <kevin@xxxxxxxxx>
> Signed-off-by: John Keeping <john@xxxxxxxxxxxxx>
> ---
> This fixes a regression in 1.8.3-rc0.
>
> git-difftool.perl | 9 ++++++++-
> t/t7800-difftool.sh | 7 +++++++
> 2 files changed, 15 insertions(+), 1 deletion(-)
>
> diff --git a/git-difftool.perl b/git-difftool.perl
> index 6780292..0a1cb0a 100755
> --- a/git-difftool.perl
> +++ b/git-difftool.perl
> @@ -92,7 +92,14 @@ sub use_wt_file
> return 0;
> }
>
> - my $wt_sha1 = $repo->command_oneline('hash-object', "$workdir/$file");
> + my $wt_sha1;
> + if (-e "$workdir/$file") {
> + $wt_sha1 = $repo->command_oneline('hash-object', "$workdir/$file");
> + } else {
> + # If the file doesn't exist in the working tree, use something
> + # that cannot match a SHA-1.
> + $wt_sha1 = '';
Yuck.
"that cannot match" might be a good justification to say "this does
not break the next line to set $use and forces it to false", but
"when we return false in $use, the value of $wt_sha1 is not used"
needs to be said to convince why this is a safe change.
But if $sha1 is $null_sha1, we do end up setting $use to true and
the caller would stuff the empty $wt_sha1 to form:
$wtindex .= "$rmode \$dst_path\0";
Is that what we want to do here, or is it a "will never happen"
condition? If the latter, the reason need to be described in this
comment (and in the log).
Thanks.
> + };
> my $use = ($sha1 eq $null_sha1) || ($sha1 eq $wt_sha1);
> return ($use, $wt_sha1);
> }
> diff --git a/t/t7800-difftool.sh b/t/t7800-difftool.sh
> index a6bd99e..d46f041 100755
> --- a/t/t7800-difftool.sh
> +++ b/t/t7800-difftool.sh
> @@ -356,6 +356,13 @@ run_dir_diff_test 'difftool --dir-diff from subdirectory' '
> )
> '
>
> +run_dir_diff_test 'difftool --dir-diff when worktree file is missing' '
> + test_when_finished git reset --hard &&
> + rm file2 &&
> + git difftool --dir-diff $symlinks --extcmd ls branch master >output &&
> + grep file2 output
> +'
> +
> write_script .git/CHECK_SYMLINKS <<\EOF
> for f in file file2 sub/sub
> do
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