From: Jeff King <peff@peff.net>
To: Taylor Blau <me@ttaylorr.com>
Cc: git@vger.kernel.org, dstolee@microsoft.com, gitster@pobox.com,
jrnieder@gmail.com
Subject: Re: [PATCH v3 10/10] t5325: check both on-disk and in-memory reverse index
Date: Thu, 28 Jan 2021 20:04:00 -0500 [thread overview]
Message-ID: <YBNfAEb+LYAIiPXB@coredump.intra.peff.net> (raw)
In-Reply-To: <38c8afabf25a7f5e144850938cf00b53e9cf25fd.1611617820.git.me@ttaylorr.com>
On Mon, Jan 25, 2021 at 06:37:51PM -0500, Taylor Blau wrote:
> Right now, the test suite can be run with 'GIT_TEST_WRITE_REV_INDEX=1'
> in the environment, which causes all operations which write a pack to
> also write a .rev file.
>
> To prepare for when that eventually becomes the default, we should
> continue to test the in-memory reverse index, too, in order to avoid
> losing existing coverage. Unfortuantely, explicit existing coverage is
> rather sparse, so only a basic test is added.
>
> The new test is parameterized over whether or not the .rev file should
> be written, and is run in both modes by t5325 (without having to touch
> GIT_TEST_WRITE_REV_INDEX).
Thanks, I think this is worth having.
> +revindex_tests () {
> + on_disk="$1"
> +
> + test_expect_success "setup revindex tests (on_disk=$on_disk)" "
> + test_oid_cache <<-EOF &&
> + disklen sha1:47
> + disklen sha256:59
> + EOF
These sizes aren't really guaranteed to be stable. I think you've
eliminated most variables by not having the opportunity for deltas,
though we're still subject to the whims of zlib, for example.
I think what we care about most is just that the on-disk and fallback
cases generate the same results. If they do, we can assume those results
are probably sane. If they're not, then a lot of _other_ stuff is going
to be broken (like, say, pack-objects, which is writing out N bytes
based on the sizes claimed by the revindex).
What do you think about just doing this:
...setup some commits... &&
git rev-list --objects --no-object-names --all >objects &&
git -c pack.writeReverseIndex=false repack -ad &&
test_path_is_missing .git/objects/pack/*.rev &&
git cat-file --batch-check="%(objectsize:disk) %(objectname)" \
<objects >in-core &&
git -c pack.writeReverseIndex=true repack -ad &&
test_path_is_file .git/objects/pack/*.rev &&
git cat-file --batch-check="%(objectsize:disk) %(objectname)" \
<objects >on-disk &&
test_cmp on-disk in-core
> + if test ztrue = \"z$on_disk\"
> + then
> + git config pack.writeReverseIndex true
> + fi &&
Are we autotools now? :) I think we can assume that on_disk contains
something sensible. Perhaps even:
git config pack.writeReverseIndex $on_disk
though if you take my advice above, all of this goes away.
-Peff
next prev parent reply other threads:[~2021-01-29 1:10 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-08 18:19 [PATCH 0/8] pack-revindex: introduce on-disk '.rev' format Taylor Blau
2021-01-08 18:19 ` [PATCH 1/8] packfile: prepare for the existence of '*.rev' files Taylor Blau
2021-01-08 18:20 ` [PATCH 2/8] pack-write.c: prepare to write 'pack-*.rev' files Taylor Blau
2021-01-08 18:20 ` [PATCH 3/8] builtin/index-pack.c: write reverse indexes Taylor Blau
2021-01-08 18:20 ` [PATCH 4/8] builtin/pack-objects.c: respect 'pack.writeReverseIndex' Taylor Blau
2021-01-08 18:20 ` [PATCH 5/8] Documentation/config/pack.txt: advertise 'pack.writeReverseIndex' Taylor Blau
2021-01-08 18:20 ` [PATCH 6/8] t: prepare for GIT_TEST_WRITE_REV_INDEX Taylor Blau
2021-01-12 17:11 ` Ævar Arnfjörð Bjarmason
2021-01-12 18:40 ` Taylor Blau
2021-01-08 18:20 ` [PATCH 7/8] t: support GIT_TEST_WRITE_REV_INDEX Taylor Blau
2021-01-12 16:49 ` Derrick Stolee
2021-01-12 17:34 ` Taylor Blau
2021-01-12 17:18 ` Ævar Arnfjörð Bjarmason
2021-01-12 17:39 ` Derrick Stolee
2021-01-12 18:17 ` Taylor Blau
2021-01-08 18:20 ` [PATCH 8/8] pack-revindex: ensure that on-disk reverse indexes are given precedence Taylor Blau
2021-01-13 22:28 ` [PATCH v2 0/8] pack-revindex: introduce on-disk '.rev' format Taylor Blau
2021-01-13 22:28 ` [PATCH v2 1/8] packfile: prepare for the existence of '*.rev' files Taylor Blau
2021-01-14 7:22 ` Junio C Hamano
2021-01-14 12:07 ` Derrick Stolee
2021-01-14 19:57 ` Jeff King
2021-01-14 18:28 ` Taylor Blau
2021-01-14 7:26 ` Junio C Hamano
2021-01-14 18:13 ` Taylor Blau
2021-01-14 20:57 ` Junio C Hamano
2021-01-22 22:54 ` Jeff King
2021-01-25 17:44 ` Taylor Blau
2021-01-25 18:27 ` Jeff King
2021-01-25 19:04 ` Junio C Hamano
2021-01-25 19:23 ` Taylor Blau
2021-01-13 22:28 ` [PATCH v2 2/8] pack-write.c: prepare to write 'pack-*.rev' files Taylor Blau
2021-01-22 23:24 ` Jeff King
2021-01-25 19:15 ` Taylor Blau
2021-01-26 21:43 ` Jeff King
2021-01-13 22:28 ` [PATCH v2 3/8] builtin/index-pack.c: write reverse indexes Taylor Blau
2021-01-22 23:53 ` Jeff King
2021-01-25 20:03 ` Taylor Blau
2021-01-13 22:28 ` [PATCH v2 4/8] builtin/pack-objects.c: respect 'pack.writeReverseIndex' Taylor Blau
2021-01-22 23:57 ` Jeff King
2021-01-23 0:08 ` Jeff King
2021-01-25 20:21 ` Taylor Blau
2021-01-25 20:50 ` Jeff King
2021-01-13 22:28 ` [PATCH v2 5/8] Documentation/config/pack.txt: advertise 'pack.writeReverseIndex' Taylor Blau
2021-01-13 22:28 ` [PATCH v2 6/8] t: prepare for GIT_TEST_WRITE_REV_INDEX Taylor Blau
2021-01-13 22:28 ` [PATCH v2 7/8] t: support GIT_TEST_WRITE_REV_INDEX Taylor Blau
2021-01-13 22:28 ` [PATCH v2 8/8] pack-revindex: ensure that on-disk reverse indexes are given precedence Taylor Blau
2021-01-25 23:37 ` [PATCH v3 00/10] pack-revindex: introduce on-disk '.rev' format Taylor Blau
2021-01-25 23:37 ` [PATCH v3 01/10] packfile: prepare for the existence of '*.rev' files Taylor Blau
2021-01-29 0:27 ` Jeff King
2021-01-29 1:14 ` Taylor Blau
2021-01-30 8:39 ` Jeff King
2021-01-25 23:37 ` [PATCH v3 02/10] pack-write.c: prepare to write 'pack-*.rev' files Taylor Blau
2021-01-25 23:37 ` [PATCH v3 03/10] builtin/index-pack.c: allow stripping arbitrary extensions Taylor Blau
2021-01-29 0:28 ` Jeff King
2021-01-29 1:15 ` Taylor Blau
2021-01-25 23:37 ` [PATCH v3 04/10] builtin/index-pack.c: write reverse indexes Taylor Blau
2021-01-25 23:37 ` [PATCH v3 05/10] builtin/pack-objects.c: respect 'pack.writeReverseIndex' Taylor Blau
2021-01-25 23:37 ` [PATCH v3 06/10] Documentation/config/pack.txt: advertise 'pack.writeReverseIndex' Taylor Blau
2021-01-29 0:30 ` Jeff King
2021-01-29 1:17 ` Taylor Blau
2021-01-30 8:41 ` Jeff King
2021-01-25 23:37 ` [PATCH v3 07/10] t: prepare for GIT_TEST_WRITE_REV_INDEX Taylor Blau
2021-01-29 0:45 ` Jeff King
2021-01-29 1:09 ` Eric Sunshine
2021-01-29 1:21 ` Taylor Blau
2021-01-30 8:43 ` Jeff King
2021-01-29 2:42 ` Junio C Hamano
2021-01-25 23:37 ` [PATCH v3 08/10] t: support GIT_TEST_WRITE_REV_INDEX Taylor Blau
2021-01-29 0:47 ` Jeff King
2021-01-25 23:37 ` [PATCH v3 09/10] pack-revindex: ensure that on-disk reverse indexes are given precedence Taylor Blau
2021-01-29 0:53 ` Jeff King
2021-01-29 1:25 ` Taylor Blau
2021-01-30 8:46 ` Jeff King
2021-01-25 23:37 ` [PATCH v3 10/10] t5325: check both on-disk and in-memory reverse index Taylor Blau
2021-01-29 1:04 ` Jeff King [this message]
2021-01-29 1:05 ` Jeff King
2021-01-29 1:32 ` Taylor Blau
2021-01-30 8:47 ` Jeff King
2021-01-26 2:36 ` [PATCH v3 00/10] pack-revindex: introduce on-disk '.rev' format Junio C Hamano
2021-01-26 2:49 ` Taylor Blau
2021-01-29 1:06 ` Jeff King
2021-01-29 1:34 ` Taylor Blau
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