[0/5] handling "-" as stdin/stdout in git bundle

Message

Jeff King March 4, 2023, 10:22 a.m. UTC

On Fri, Mar 03, 2023 at 08:46:24PM -0500, Jeff King wrote:

> > I wasn't thinking of changing the behavior for input, but just focusing
> > the docs in the right spot (the "create" option), like:
> 
> Oh, hmph. I didn't realize that both my patch and yours are touching a
> shared options-parser that affects both reading and writing. So the
> patch by itself is fixing "git bundle create -" but breaking "git bundle
> verify -". We either need to teach the reading side to handle "-", or we
> have to teach parse_options_cmd_bundle() to handle the two cases
> differently.

So here's a potential series. It does teach "-" to the reading side.
Which is technically a behavior change, but one that I hope people will
find pretty reasonable.

The patches are:

  [1/5]: bundle: let "-" mean stdin for reading operations

    Does what it says. I did it as a preparatory patch before yours, so
    that there's never a state where we are treating "-" as special for
    prefixing but it doesn't actually work yet. :-/

  [2/5]: bundle: document handling of "-" as stdin

    One half of the doc-fixes discussed earlier, but of course covering
    all operations now.

  [3/5]: bundle: don't blindly apply prefix_filename() to "-"

    Your patch, but rebased and with the comment above fix_filename()
    dropped (since it's handled below). I saw you prepared yours on
    "maint". I did this one on "master", because some of the
    leak-handling in the other patches needs it. Since this has been
    broken for ages, and since "master" is about to become "maint" when
    2.40 release in a few days, it seemed simpler to just wait. But if
    we really want to, I think we could reorder and split it into two
    topics.

  [4/5]: parse-options: consistently allocate memory in fix_filename()

    Leak-fixes that also get us ready for using your new helper. :)

  [5/5]: parse-options: use prefix_filename_except_for_dash() helper

    And using the new helper. This could arguably be squashed into 4,
    but I wasn't sure at the outset what order to do it in (another
    option is putting 4 earlier, and then just converting it over in
    your patch 3).

 Documentation/git-bundle.txt        |  8 +++++---
 abspath.c                           |  7 +++++++
 builtin/archive.c                   |  3 ++-
 builtin/bundle.c                    | 28 +++++++++++++++++++++++-----
 builtin/checkout.c                  |  3 ++-
 builtin/reset.c                     |  4 +++-
 builtin/tag.c                       |  4 +++-
 cache.h                             |  3 +++
 parse-options.c                     | 12 ++++++------
 t/helper/test-parse-pathspec-file.c |  3 ++-
 t/t6020-bundle-misc.sh              | 26 ++++++++++++++++++++++++++
 11 files changed, 82 insertions(+), 19 deletions(-)

-Peff