From: Derrick Stolee <stolee@gmail.com>
To: Elijah Newren <newren@gmail.com>,
Derrick Stolee via GitGitGadget <gitgitgadget@gmail.com>
Cc: Git Mailing List <git@vger.kernel.org>,
Derrick Stolee <derrickstolee@github.com>,
Derrick Stolee <dstolee@microsoft.com>
Subject: Re: [PATCH 7/9] sparse-checkout: hold pattern list in index
Date: Wed, 20 Jan 2021 14:22:33 -0500 [thread overview]
Message-ID: <fb1800fb-474a-e20b-5596-6bb3bc22fe99@gmail.com> (raw)
In-Reply-To: <CABPp-BEeDj4v4t8w6giy-yo8ET0mnD3es95aGQJvw7g8_jkjzA@mail.gmail.com>
On 1/20/2021 1:03 PM, Elijah Newren wrote:
> On Wed, Jan 20, 2021 at 8:54 AM Derrick Stolee via GitGitGadget
> <gitgitgadget@gmail.com> wrote:
>>
>> From: Derrick Stolee <dstolee@microsoft.com>
>>
>> As we modify the sparse-checkout definition, we perform index operations
>> on a pattern_list that only exists in-memory. This allows easy backing
>> out in case the index update fails.
>>
>> However, if the index write itself cares about the sparse-checkout
>> pattern set, we need access to that in-memory copy. Place a pointer to
>> a 'struct pattern_list' in the index so we can access this on-demand.
>>
>> Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
>> ---
>> builtin/sparse-checkout.c | 17 ++++++++++-------
>> cache.h | 2 ++
>> 2 files changed, 12 insertions(+), 7 deletions(-)
>>
>> diff --git a/builtin/sparse-checkout.c b/builtin/sparse-checkout.c
>> index 2306a9ad98e..e00b82af727 100644
>> --- a/builtin/sparse-checkout.c
>> +++ b/builtin/sparse-checkout.c
>> @@ -110,6 +110,8 @@ static int update_working_directory(struct pattern_list *pl)
>> if (is_index_unborn(r->index))
>> return UPDATE_SPARSITY_SUCCESS;
>>
>> + r->index->sparse_checkout_patterns = pl;
>> +
>> memset(&o, 0, sizeof(o));
>> o.verbose_update = isatty(2);
>> o.update = 1;
>> @@ -138,6 +140,7 @@ static int update_working_directory(struct pattern_list *pl)
>> else
>> rollback_lock_file(&lock_file);
>>
>> + r->index->sparse_checkout_patterns = NULL;
>> return result;
>
> The setting back to NULL made me curious; we don't want this
> information to remain available later? Is it only going to be used
> for the updating of the working directory?
>
> I dug a bit into the callers, and didn't find the answer to my
> question...but I did notice that modify_pattern_list() will correctly
> free the patterns after write_patterns_and_update() via calling
> clear_pattern_list(&pl), but sparse_checkout_init() appears to leak
> the patterns it allocates. That's a separate issue from this patch,
> but do you want to fix that up while working in this area (so I avoid
> stepping on your toes with all your other patches)?
The thing that caught me here is that update_working_directory() uses
an in-memory pattern_list that hasn't been committed to the
sparse-checkout file yet. This means we need to (temporarily) point
to this pattern_list.
Perhaps this patch is premature, since nothing actually _uses_
sparse_checkout_patterns yet. When we do add such a use, it will
initialize a NULL value with the patterns in the sparse-checkout
file. In that case, we definitely want to inject our in-memory
patterns instead.
Thanks,
-Stolee
next prev parent reply other threads:[~2021-01-20 19:25 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-20 16:53 [PATCH 0/9] More index cleanups Derrick Stolee via GitGitGadget
2021-01-20 16:53 ` [PATCH 1/9] cache-tree: clean up cache_tree_update() Derrick Stolee via GitGitGadget
2021-01-20 17:21 ` Elijah Newren
2021-01-20 19:10 ` Derrick Stolee
2021-01-20 16:53 ` [PATCH 2/9] cache-tree: extract subtree_pos() Derrick Stolee via GitGitGadget
2021-01-20 17:23 ` Elijah Newren
2021-01-20 16:53 ` [PATCH 3/9] fsmonitor: de-duplicate BUG()s around dirty bits Derrick Stolee via GitGitGadget
2021-01-20 17:26 ` Elijah Newren
2021-01-21 12:53 ` Chris Torek
2021-01-21 15:56 ` Derrick Stolee
2021-01-20 16:53 ` [PATCH 4/9] repository: add repo reference to index_state Derrick Stolee via GitGitGadget
2021-01-20 17:46 ` Elijah Newren
2021-01-20 19:16 ` Derrick Stolee
2021-01-20 19:50 ` Elijah Newren
2021-01-20 16:53 ` [PATCH 5/9] name-hash: use trace2 regions for init Derrick Stolee via GitGitGadget
2021-01-20 17:47 ` Elijah Newren
2021-01-20 16:53 ` [PATCH 6/9] sparse-checkout: load sparse-checkout patterns Derrick Stolee via GitGitGadget
2021-01-20 17:54 ` Elijah Newren
2021-01-20 16:53 ` [PATCH 7/9] sparse-checkout: hold pattern list in index Derrick Stolee via GitGitGadget
2021-01-20 18:03 ` Elijah Newren
2021-01-20 19:22 ` Derrick Stolee [this message]
2021-01-20 16:53 ` [PATCH 8/9] test-lib: test_region looks for trace2 regions Derrick Stolee via GitGitGadget
2021-01-20 18:20 ` Elijah Newren
2021-01-20 19:24 ` Derrick Stolee
2021-01-20 16:53 ` [PATCH 9/9] t1092: test interesting sparse-checkout scenarios Derrick Stolee via GitGitGadget
2021-01-20 19:40 ` Elijah Newren
2021-01-21 11:59 ` Derrick Stolee
2021-01-22 13:03 ` [PATCH v2 0/8] More index cleanups Derrick Stolee via GitGitGadget
2021-01-22 13:03 ` [PATCH v2 1/8] cache-tree: clean up cache_tree_update() Derrick Stolee via GitGitGadget
2021-01-22 19:11 ` Junio C Hamano
2021-01-22 13:03 ` [PATCH v2 2/8] cache-tree: extract subtree_pos() Derrick Stolee via GitGitGadget
2021-01-22 13:03 ` [PATCH v2 3/8] fsmonitor: de-duplicate BUG()s around dirty bits Derrick Stolee via GitGitGadget
2021-01-22 19:18 ` Junio C Hamano
2021-01-22 13:03 ` [PATCH v2 4/8] repository: add repo reference to index_state Derrick Stolee via GitGitGadget
2021-01-22 19:23 ` Junio C Hamano
2021-01-22 13:03 ` [PATCH v2 5/8] name-hash: use trace2 regions for init Derrick Stolee via GitGitGadget
2021-01-22 13:03 ` [PATCH v2 6/8] sparse-checkout: load sparse-checkout patterns Derrick Stolee via GitGitGadget
2021-01-22 13:03 ` [PATCH v2 7/8] test-lib: test_region looks for trace2 regions Derrick Stolee via GitGitGadget
2021-01-22 19:42 ` Junio C Hamano
2021-01-23 18:36 ` Derrick Stolee
2021-01-23 18:50 ` Junio C Hamano
2021-01-22 13:03 ` [PATCH v2 8/8] t1092: test interesting sparse-checkout scenarios Derrick Stolee via GitGitGadget
2021-01-22 19:49 ` [PATCH v2 0/8] More index cleanups Elijah Newren
2021-01-23 18:47 ` Derrick Stolee
2021-01-23 19:58 ` [PATCH v3 0/9] " Derrick Stolee via GitGitGadget
2021-01-23 19:58 ` [PATCH v3 1/9] cache-tree: clean up cache_tree_update() Derrick Stolee via GitGitGadget
2021-01-23 19:58 ` [PATCH v3 2/9] cache-tree: simplify verify_cache() prototype Derrick Stolee via GitGitGadget
2021-01-23 20:24 ` Elijah Newren
2021-01-23 21:02 ` Derrick Stolee
2021-01-23 21:10 ` Elijah Newren
2021-01-23 21:41 ` Junio C Hamano
2021-01-23 21:10 ` Junio C Hamano
2021-01-23 21:14 ` Derrick Stolee
2021-01-23 19:58 ` [PATCH v3 3/9] cache-tree: extract subtree_pos() Derrick Stolee via GitGitGadget
2021-01-23 19:58 ` [PATCH v3 4/9] fsmonitor: de-duplicate BUG()s around dirty bits Derrick Stolee via GitGitGadget
2021-01-23 19:58 ` [PATCH v3 5/9] repository: add repo reference to index_state Derrick Stolee via GitGitGadget
2021-01-23 19:58 ` [PATCH v3 6/9] name-hash: use trace2 regions for init Derrick Stolee via GitGitGadget
2021-01-23 19:58 ` [PATCH v3 7/9] sparse-checkout: load sparse-checkout patterns Derrick Stolee via GitGitGadget
2021-01-23 19:58 ` [PATCH v3 8/9] test-lib: test_region looks for trace2 regions Derrick Stolee via GitGitGadget
2021-01-23 21:07 ` Derrick Stolee
2021-01-23 19:58 ` [PATCH v3 9/9] t1092: test interesting sparse-checkout scenarios Derrick Stolee via GitGitGadget
2021-01-25 18:45 ` Elijah Newren
2021-01-23 20:29 ` [PATCH v3 0/9] More index cleanups Elijah Newren
2021-01-23 21:05 ` Derrick Stolee
2021-01-23 21:42 ` Junio C Hamano
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: http://vger.kernel.org/majordomo-info.html
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=fb1800fb-474a-e20b-5596-6bb3bc22fe99@gmail.com \
--to=stolee@gmail.com \
--cc=derrickstolee@github.com \
--cc=dstolee@microsoft.com \
--cc=git@vger.kernel.org \
--cc=gitgitgadget@gmail.com \
--cc=newren@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://80x24.org/mirrors/git.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).