On Fri, Mar 22, 2013 at 08:13:46AM +0100, Johannes Sixt wrote:
> Am 3/21/2013 8:41, schrieb Johannes Sixt:
> > Am 3/20/2013 23:59, schrieb David Aguilar:
> >> I started digging in and the @worktree_files (aka @worktree above)
> >> is populated from the output of "git diff --raw ...".
> >>
> >> Seeing the "output" filename in "diff --raw" implies that one of the
> >> tests added "output" to the index somehow. I do not see that
> >> happening anywhere, though, so I do not know how it would end up in
> >> the @worktree array if it is not reported by "diff --raw".
> >>
> >>
> >> My current understanding of how it could possibly be open twice:
> >>
> >> 1. via the >output redirect
> >> 2. via the copy() perl code which is fed by @worktree
> >>
> >> So I'm confused. Why would we get different results on Windows?
> >
> > I tracked down the difference between Windows and Linux, and it is...
> >
> > for my $file (@worktree) {
> > next if $symlinks && -l "$b/$file";
> >
> > ... this line in sub dir_diff. On Linux, we take the short-cut, but on
> > Windows we proceed through the rest of the loop,
>
> And that is likely by design. From the docs:
>
> --symlinks
> --no-symlinks
>
> git difftool's default behavior is create symlinks to the working
> tree when run in --dir-diff mode.
>
> Specifying `--no-symlinks` instructs 'git difftool' to create
> copies instead. `--no-symlinks` is the default on Windows.
>
> And indeed, we have this initialization:
>
> my %opts = (
> ...
> symlinks => $^O ne 'cygwin' &&
> $^O ne 'MSWin32' && $^O ne 'msys',
> ...
> );
>
> Can the --dir-diff tests case pass on Cygwin when neither --symlinks nor
> --no-symlinks is passed?
>
> Perhaps the right solution is this:
We already have tests that explicitly pass '--symlinks'. I wonder if it
would be better to change "output" to ".git/output", which should avoid
the problem by moving the output file out of the working tree.
> diff --git a/t/t7800-difftool.sh b/t/t7800-difftool.sh
> index c6d6b1c..19238f6 100755
> --- a/t/t7800-difftool.sh
> +++ b/t/t7800-difftool.sh
> @@ -328,14 +328,16 @@ test_expect_success PERL 'setup change in subdirectory'
> '
> git commit -m "modified both"
> '
>
> -test_expect_success PERL 'difftool -d' '
> - git difftool -d --extcmd ls branch >output &&
> +# passing --symlinks helps Cygwin, which defaults to --no-symlinks
> +
> +test_expect_success PERL,SYMLINKS 'difftool -d' '
> + git difftool -d --symlinks --extcmd ls branch >output &&
> stdin_contains sub <output &&
> stdin_contains file <output
> '
>
> -test_expect_success PERL 'difftool --dir-diff' '
> - git difftool --dir-diff --extcmd ls branch >output &&
> +test_expect_success PERL,SYMLINKS 'difftool --dir-diff' '
> + git difftool --dir-diff --symlinks --extcmd ls branch >output &&
> stdin_contains sub <output &&
> stdin_contains file <output
> '
> @@ -362,16 +364,16 @@ test_expect_success PERL,SYMLINKS 'difftool --dir-diff
> --symlink without unstage
> test_cmp actual expect
> '
>
> -test_expect_success PERL 'difftool --dir-diff ignores --prompt' '
> - git difftool --dir-diff --prompt --extcmd ls branch >output &&
> +test_expect_success PERL,SYMLINKS 'difftool --dir-diff ignores --prompt' '
> + git difftool --dir-diff --symlinks --prompt --extcmd ls branch >output
> &&
> stdin_contains sub <output &&
> stdin_contains file <output
> '
>
> -test_expect_success PERL 'difftool --dir-diff from subdirectory' '
> +test_expect_success PERL,SYMLINKS 'difftool --dir-diff from subdirectory' '
> (
> cd sub &&
> - git difftool --dir-diff --extcmd ls branch >output &&
> + git difftool --dir-diff --symlinks --extcmd ls branch >output &&
> stdin_contains sub <output &&
> stdin_contains file <output
> )
>
> (Only tested on MinGW, which skips the tests.) I leave it to you
> to write --no-symlinks tests.
>
> -- Hannes
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