From: Junio C Hamano <gitster@pobox.com>
To: Jeff King <peff@peff.net>
Cc: "Michael Haggerty" <mhagger@alum.mit.edu>,
"Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>,
"Stefan Beller" <sbeller@google.com>,
"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>,
"David Turner" <novalis@novalis.org>,
"Brandon Williams" <bmwill@google.com>,
git@vger.kernel.org
Subject: Re: [PATCH v2 00/29] Create a reference backend for packed refs
Date: Fri, 23 Jun 2017 14:47:01 -0700 [thread overview]
Message-ID: <xmqqefuacr6y.fsf@gitster.mtv.corp.google.com> (raw)
In-Reply-To: <20170623200024.amgced62hue2iffj@sigill.intra.peff.net> (Jeff King's message of "Fri, 23 Jun 2017 16:00:24 -0400")
Jeff King <peff@peff.net> writes:
> On Fri, Jun 23, 2017 at 03:01:59PM -0400, Jeff King wrote:
>
>> On Fri, Jun 23, 2017 at 09:01:18AM +0200, Michael Haggerty wrote:
>>
>> > * Change patch 17 "packed_ref_store: support iteration" to always
>> > iterate over the packed refs using `DO_FOR_EACH_INCLUDE_BROKEN`.
>> > This switches off the check in the packed-ref iterator of whether a
>> > reference is broken. This is now checked only in
>> > `files_ref_iterator_advance()`, after the packed and loose
>> > references have been merged together. It also saves some work.
>>
>> I'm curious why you prefer this solution to just removing the code
>> entirely. Wouldn't it be an error to call the packed ref iterator
>> without INCLUDE_BROKEN? The "entries may not be valid" thing is a
>> property of the packed-refs concept itself, not a particular caller's
>> view of it.
>
> Speculating on my own question. I guess it would prepare us for a day
> when a possible ref store is to use a packed-refs _without_ loose refs.
> IOW, the property is defined on packed-refs today, but a possible future
> direction would be to use it by itself. But maybe I'm just making things
> up.
OK. In other words, it's not a packed-refs's characteristics that
cruft are allowed. It's that a ref storage that is implemented as
an overlay of one storage (which happens to be the loose one) on top
of another (which happens to be the packed refs file) allows the
latter one to have cruft if (and only if) that broken one is covered
by the former one.
> At any rate, I've read through the whole series and dropped a few
> comments in there. Overall it looks good. If I had one complaint, it's
> that the individual commits all look obviously correct but it is hard to
> judge whether the bigger steps they are taking are the right thing. I
> mostly have faith in you, as I know that your end goal is a good one,
> and that you're very familiar with this code. But just something I
> noticed while reviewing.
Thanks.
next prev parent reply other threads:[~2017-06-23 21:47 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-23 7:01 [PATCH v2 00/29] Create a reference backend for packed refs Michael Haggerty
2017-06-23 7:01 ` [PATCH v2 01/29] t1408: add a test of stale packed refs covered by loose refs Michael Haggerty
2017-06-23 18:59 ` Jeff King
2017-06-23 20:22 ` Junio C Hamano
2017-06-23 7:01 ` [PATCH v2 02/29] add_packed_ref(): teach function to overwrite existing refs Michael Haggerty
2017-06-23 7:01 ` [PATCH v2 03/29] packed_ref_store: new struct Michael Haggerty
2017-06-23 7:01 ` [PATCH v2 04/29] packed_ref_store: move `packed_refs_path` here Michael Haggerty
2017-06-23 7:01 ` [PATCH v2 05/29] packed_ref_store: move `packed_refs_lock` member here Michael Haggerty
2017-06-23 7:01 ` [PATCH v2 06/29] clear_packed_ref_cache(): take a `packed_ref_store *` parameter Michael Haggerty
2017-06-23 7:01 ` [PATCH v2 07/29] validate_packed_ref_cache(): " Michael Haggerty
2017-06-23 7:01 ` [PATCH v2 08/29] get_packed_ref_cache(): " Michael Haggerty
2017-06-23 7:01 ` [PATCH v2 09/29] get_packed_refs(): " Michael Haggerty
2017-06-23 7:01 ` [PATCH v2 10/29] add_packed_ref(): " Michael Haggerty
2017-06-23 7:01 ` [PATCH v2 11/29] lock_packed_refs(): " Michael Haggerty
2017-06-23 7:01 ` [PATCH v2 12/29] commit_packed_refs(): " Michael Haggerty
2017-06-23 7:01 ` [PATCH v2 13/29] rollback_packed_refs(): " Michael Haggerty
2017-06-23 7:01 ` [PATCH v2 14/29] get_packed_ref(): " Michael Haggerty
2017-06-23 7:01 ` [PATCH v2 15/29] repack_without_refs(): " Michael Haggerty
2017-06-23 7:01 ` [PATCH v2 16/29] packed_peel_ref(): new function, extracted from `files_peel_ref()` Michael Haggerty
2017-06-23 7:01 ` [PATCH v2 17/29] packed_ref_store: support iteration Michael Haggerty
2017-06-23 19:12 ` Jeff King
2017-06-23 7:01 ` [PATCH v2 18/29] packed_read_raw_ref(): new function, replacing `resolve_packed_ref()` Michael Haggerty
2017-06-23 7:01 ` [PATCH v2 19/29] packed-backend: new module for handling packed references Michael Haggerty
2017-06-23 19:35 ` Jeff King
2017-06-23 19:46 ` Stefan Beller
2017-06-23 21:20 ` Junio C Hamano
2017-06-23 7:01 ` [PATCH v2 20/29] packed_ref_store: make class into a subclass of `ref_store` Michael Haggerty
2017-06-23 19:40 ` Jeff King
2017-06-23 7:01 ` [PATCH v2 21/29] commit_packed_refs(): report errors rather than dying Michael Haggerty
2017-06-23 7:01 ` [PATCH v2 22/29] commit_packed_refs(): use a staging file separate from the lockfile Michael Haggerty
2017-06-23 19:46 ` Jeff King
2017-06-24 11:43 ` Michael Haggerty
2017-06-24 11:57 ` Jeff King
2017-06-23 7:01 ` [PATCH v2 23/29] packed_refs_lock(): function renamed from lock_packed_refs() Michael Haggerty
2017-06-23 7:01 ` [PATCH v2 24/29] packed_refs_lock(): report errors via a `struct strbuf *err` Michael Haggerty
2017-06-23 7:01 ` [PATCH v2 25/29] packed_refs_unlock(), packed_refs_is_locked(): new functions Michael Haggerty
2017-06-23 7:01 ` [PATCH v2 26/29] clear_packed_ref_cache(): don't protest if the lock is held Michael Haggerty
2017-06-23 19:49 ` Jeff King
2017-06-23 7:01 ` [PATCH v2 27/29] commit_packed_refs(): remove call to `packed_refs_unlock()` Michael Haggerty
2017-06-23 19:51 ` Jeff King
2017-06-23 7:01 ` [PATCH v2 28/29] repack_without_refs(): don't lock or unlock the packed refs Michael Haggerty
2017-06-23 19:56 ` Jeff King
2017-07-01 17:11 ` Michael Haggerty
2017-06-23 7:01 ` [PATCH v2 29/29] read_packed_refs(): die if `packed-refs` contains bogus data Michael Haggerty
2017-06-23 19:58 ` Jeff King
2017-07-01 18:15 ` Michael Haggerty
2017-06-23 19:01 ` [PATCH v2 00/29] Create a reference backend for packed refs Jeff King
2017-06-23 20:00 ` Jeff King
2017-06-23 21:47 ` Junio C Hamano [this message]
2017-06-24 1:11 ` Jeff King
2017-06-24 11:14 ` Michael Haggerty
2017-06-23 20:24 ` Junio C Hamano
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