Re: [PATCH v2 05/18] maintenance: add commit-graph task

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Derrick Stolee <stolee@xxxxxxxxx> writes:

> But you are discussing here how the _behavior_ can change when
> --auto is specified. And specifically, "git gc --auto" really
> meant "This is running after a foreground command, so only do
> work if necessary and do it quickly to minimize blocking time."
>
> I'd be happy to replace "--auto" with "--quick" in the
> maintenance builtin.
>
> This opens up some extra design space for how the individual
> tasks perform depending on "--quick" being specified or not.
> My intention was to create tasks that are already in "quick"
> mode:
>
> * loose-objects have a maximum batch size.
> * incremental-repack is capped in size.
> * commit-graph uses the --split option.
>
> But this "quick" distinction might be important for some of
> the tasks we intend to extract from the gc builtin.

Yup.  To be honest, I came to this topic from a completely different
direction.  The field name "auto" alone (and no other field name)
had to have an extra cruft (i.e. "_flag") attached to it, which is
understandable but ugly.  Then I started thinking if 'auto(matic)'
is really the right word to describe what we want out of the option,
and came to the realization that there may be better words.

> Since the tasks are frequently running subcommands, returning
> 0 for success and non-zero for error matches the error codes
> returned by those subcommands.

As long as these will _never_ be called from other helper functions
but from the cmd_foo() top-level and their return values are only
used directly as the top-level's return value, I do not mind too
much.

But whenever I am writing such a code, I find myself not brave
enough to make such a bold promise (I saw other people call the
helpers I wrote in unintended ways and had to adjust the semantics
of them to accomodate the new callers too many times), so I'd rather
see the caller do "return !!helper_fn()" to allow helper_fn() to be
written more naturally (e.g. letting them return error(...)).

Thanks.



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