On Wed, Sep 11, 2013 at 3:20 PM, John Keeping <j...@keeping.me.uk> wrote:
> On Wed, Sep 11, 2013 at 08:05:44AM +0200, Johannes Sixt wrote:
>> Am 10.09.2013 21:13, schrieb John Keeping:
>> > When using tab-completion, a directory path will often end with a
>> > trailing slash which currently confuses "git rm" when dealing with
>> > submodules.  Now that we have parse_pathspec we can easily handle this
>> > by simply adding the PATHSPEC_STRIP_SUBMODULE_SLASH_CHEAP flag.
>> >
>> > Signed-off-by: John Keeping <j...@keeping.me.uk>
>> > ---
>> >  builtin/reset.c            | 5 +++++
>> >  t/t7400-submodule-basic.sh | 6 ++++--
>> >  2 files changed, 9 insertions(+), 2 deletions(-)
>> >
>> > diff --git a/builtin/reset.c b/builtin/reset.c
>> > index 5e4c551..9efac0f 100644
>> > --- a/builtin/reset.c
>> > +++ b/builtin/reset.c
>> > @@ -220,8 +220,13 @@ static void parse_args(struct pathspec *pathspec,
>> >             }
>> >     }
>> >     *rev_ret = rev;
>> > +
>> > +   if (read_cache() < 0)
>> > +           die(_("index file corrupt"));
>>
>> When the index is now read here, I would have expected hunk in this
>> patch that removes a read_cache() invocation.
>
> I think that needs to look like this on top - there's also a
> read_cache_unmerged() around line 68 but I don't think we can remove
> that one.
>
> -- >8 --
> diff --git a/builtin/reset.c b/builtin/reset.c
> index 9efac0f..800117f 100644
> --- a/builtin/reset.c
> +++ b/builtin/reset.c
> @@ -143,7 +143,6 @@ static int read_from_tree(const struct pathspec *pathspec,
>         opt.output_format = DIFF_FORMAT_CALLBACK;
>         opt.format_callback = update_index_from_diff;
>
> -       read_cache();
>         if (do_diff_cache(tree_sha1, &opt))
>                 return 1;
>         diffcore_std(&opt);
> @@ -169,7 +168,7 @@ static void set_reflog_message(struct strbuf *sb, const 
> char *action,
>
>  static void die_if_unmerged_cache(int reset_type)
>  {
> -       if (is_merge() || read_cache() < 0 || unmerged_cache())
> +       if (is_merge() || unmerged_cache())
>                 die(_("Cannot do a %s reset in the middle of a merge."),
>                     _(reset_type_names[reset_type]));

reset --soft does not go through these code paths (i.e. it does not
need index at all). If we fail to load index index in "reset --soft" I
think it's ok to die(). Corrupt index is fatal anyway. But "reset
--soft" now has to pay the cost to load index, which could be slow
when the index is big. Assuming nobody does "reset --soft" that often
I think this is OK.

Alternatively we could load index lazily in _CHEAP code only when we
see trailing slashes, then replace these read_cache() with
read_cache_unless_its_already_loaded_earlier() or something.
-- 
Duy
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