Re: [PATCH v5 02/17] sparse-checkout: create 'init' subcommand

> On Mon, Oct 21, 2019 at 01:56:11PM +0000, Derrick Stolee via GitGitGadget wrote:
>> Getting started with a sparse-checkout file can be daunting. Help
>> users start their sparse enlistment using 'git sparse-checkout init'.
>> This will set 'core.sparseCheckout=true' in their config, write
>> an initial set of patterns to the sparse-checkout file, and update
>> their working directory.
> 
> Enabling sparse-checkout can remove modified files:
> 
>   $ mkdir dir
>   $ touch foo dir/bar
>   $ git add .
>   $ git commit -m Initial
>   [master (root-commit) ecc81bd] Initial
>    2 files changed, 0 insertions(+), 0 deletions(-)
>    create mode 100644 dir/bar
>    create mode 100644 foo
>   $ echo changes >dir/bar
>   $ ~/src/git/git sparse-checkout init
>   error: Entry 'dir/bar' not uptodate. Cannot update sparse checkout.
>   error: failed to update index with new sparse-checkout paths
>   $ cat dir/bar 
>   changes
> 
> So far so good, my changes are still there.  Unfortunately, however:
> 
>   $ git add -u
>   $ ~/src/git/git sparse-checkout init
>   $ echo $?
>   0
>   $ ls
>   foo
> 
> Uh-oh, my changes are gone.