Re: [PATCH 10/10] t7800: work around the MSYS path conversion on Windows

> Git's test suite's relies on Unix shell scripting, which is
> understandable, of course, given Git's firm roots (and indeed, ongoing
> focus) on Linux.
>
> This fact, combined with Unix shell scripting's natural
> habitat -- which is, naturally... *drumroll*... Unix --
> often has unintended side effects, where developers expect the test
> suite to run in a Unix environment, which is an incorrect assumption.
>
> One instance of this problem can be observed in the 'difftool --dir-diff
> handles modified symlinks' test case in `t7800-difftool.sh`, which
> assumes that that all absolute paths start with a forward slash. That

> assumption is incorrect in general, e.g. on Windows, where absolute
> paths have many shapes and forms, none of which starts with a forward
> slash.
>
> The only saving grace is that this test case is currently not run on
> Windows because of the `SYMLINK` prerequisite. However, I am currently
> working towards upstreaming symbolic link support from Git for Windows
> to upstream Git, which will put a crack into that saving grace.
>
> Let's change that test case so that it does not rely on absolute paths
> (which are passed to the "external command" `ls` as parameters and are
> therefore part of its output, and which the test case wants to filter
> out before verifying that the output is as expected) starting with a
> forward slash. Let's instead rely on the much more reliable fact that
> `ls` will output the path in a line that ends in a colon, and simply
> filter out those lines by matching said colon instead.
>
> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>