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From: "Victoria Dye via GitGitGadget" <gitgitgadget@gmail.com>
To: git@vger.kernel.org
Cc: derrickstolee@github.com, newren@gmail.com, gitster@pobox.com,
	Victoria Dye <vdye@github.com>, Victoria Dye <vdye@github.com>
Subject: [PATCH v3 4/6] read-cache: set sparsity when index is new
Date: Tue, 10 May 2022 23:32:30 +0000	[thread overview]
Message-ID: <bb092c075f499acd5aa86debee0a23fa66ac523d.1652225552.git.gitgitgadget@gmail.com> (raw)
In-Reply-To: <pull.1171.v3.git.1652225552.gitgitgadget@gmail.com>

From: Victoria Dye <vdye@github.com>

When the index read in 'do_read_index()' does not exist on-disk, mark the
index "sparse" if the executing command does not require a full index and
sparse index is otherwise enabled.

Some commands (such as 'git stash -u') implicitly create a new index (when
the 'GIT_INDEX_FILE' variable points to a non-existent file) and perform
some operation on it. However, when this index is created, it isn't created
with the same sparsity settings as the repo index. As a result, while these
indexes may be sparse during the operation, they are always expanded before
being written to disk. We can avoid that expansion by defaulting the index
to "sparse", in which case it will only be expanded if the full index is
needed.

Note that the function 'set_new_index_sparsity()' is created despite having
only a single caller because additional callers will be added in a
subsequent patch.

Signed-off-by: Victoria Dye <vdye@github.com>
---
 read-cache.c                             | 18 +++++++++++++++++-
 t/t1092-sparse-checkout-compatibility.sh |  2 +-
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/read-cache.c b/read-cache.c
index 4df97e185e9..60355f5ad6a 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -2260,6 +2260,20 @@ static unsigned long load_cache_entries_threaded(struct index_state *istate, con
 	return consumed;
 }
 
+static void set_new_index_sparsity(struct index_state *istate)
+{
+	/*
+	 * If the index's repo exists, mark it sparse according to
+	 * repo settings.
+	 */
+	if (istate->repo) {
+		prepare_repo_settings(istate->repo);
+		if (!istate->repo->settings.command_requires_full_index &&
+		    is_sparse_index_allowed(istate, 0))
+			istate->sparse_index = 1;
+	}
+}
+
 /* remember to discard_cache() before reading a different cache! */
 int do_read_index(struct index_state *istate, const char *path, int must_exist)
 {
@@ -2281,8 +2295,10 @@ int do_read_index(struct index_state *istate, const char *path, int must_exist)
 	istate->timestamp.nsec = 0;
 	fd = open(path, O_RDONLY);
 	if (fd < 0) {
-		if (!must_exist && errno == ENOENT)
+		if (!must_exist && errno == ENOENT) {
+			set_new_index_sparsity(istate);
 			return 0;
+		}
 		die_errno(_("%s: index file open failed"), path);
 	}
 
diff --git a/t/t1092-sparse-checkout-compatibility.sh b/t/t1092-sparse-checkout-compatibility.sh
index 75d844cd71d..85c6a56f1b7 100755
--- a/t/t1092-sparse-checkout-compatibility.sh
+++ b/t/t1092-sparse-checkout-compatibility.sh
@@ -1389,7 +1389,7 @@ test_expect_success 'sparse-index is not expanded: stash' '
 	ensure_not_expanded stash drop stash@{0} &&
 
 	echo >>sparse-index/deep/new &&
-	! ensure_not_expanded stash -u &&
+	ensure_not_expanded stash -u &&
 	(
 		WITHOUT_UNTRACKED_TXT=1 &&
 		! ensure_not_expanded stash pop
-- 
gitgitgadget


  parent reply	other threads:[~2022-05-10 23:32 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-25 17:49 [PATCH 0/7] Sparse index: integrate with 'git stash' Victoria Dye via GitGitGadget
2022-04-25 17:49 ` [PATCH 1/7] stash: expand sparse-checkout compatibility testing Victoria Dye via GitGitGadget
2022-04-25 17:49 ` [PATCH 2/7] stash: integrate with sparse index Victoria Dye via GitGitGadget
2022-04-25 21:34   ` Junio C Hamano
2022-04-26 12:53   ` Derrick Stolee
2022-04-26 15:26     ` Victoria Dye
2022-04-26 16:21     ` Junio C Hamano
2022-04-25 17:49 ` [PATCH 3/7] sparse-index: expose 'is_sparse_index_allowed()' Victoria Dye via GitGitGadget
2022-04-25 17:49 ` [PATCH 4/7] read-cache: set sparsity when index is new Victoria Dye via GitGitGadget
2022-04-25 21:35   ` Junio C Hamano
2022-04-25 17:49 ` [PATCH 5/7] merge-recursive: add merge function arg to 'merge_recursive_generic' Victoria Dye via GitGitGadget
2022-04-25 21:38   ` Junio C Hamano
2022-04-26 12:57     ` Derrick Stolee
2022-04-25 17:49 ` [PATCH 6/7] stash: merge applied stash with merge-ort Victoria Dye via GitGitGadget
2022-04-26 13:02   ` Derrick Stolee
2022-04-25 17:49 ` [PATCH 7/7] unpack-trees: preserve index sparsity Victoria Dye via GitGitGadget
2022-04-26 12:49 ` [PATCH 0/7] Sparse index: integrate with 'git stash' Derrick Stolee
2022-04-26 13:09   ` Derrick Stolee
2022-04-27 18:16 ` [PATCH v2 " Victoria Dye via GitGitGadget
2022-04-27 18:16   ` [PATCH v2 1/7] stash: expand sparse-checkout compatibility testing Victoria Dye via GitGitGadget
2022-04-27 18:16   ` [PATCH v2 2/7] stash: integrate with sparse index Victoria Dye via GitGitGadget
2022-04-27 18:16   ` [PATCH v2 3/7] sparse-index: expose 'is_sparse_index_allowed()' Victoria Dye via GitGitGadget
2022-04-27 18:16   ` [PATCH v2 4/7] read-cache: set sparsity when index is new Victoria Dye via GitGitGadget
2022-04-27 18:16   ` [PATCH v2 5/7] merge-recursive: add merge function arg to 'merge_recursive_generic' Victoria Dye via GitGitGadget
2022-05-06  7:23     ` Elijah Newren
2022-05-09 19:24       ` Victoria Dye
2022-05-10  7:06         ` Elijah Newren
2022-04-27 18:16   ` [PATCH v2 6/7] stash: merge applied stash with merge-ort Victoria Dye via GitGitGadget
2022-04-27 18:16   ` [PATCH v2 7/7] unpack-trees: preserve index sparsity Victoria Dye via GitGitGadget
2022-05-06  7:46   ` [PATCH v2 0/7] Sparse index: integrate with 'git stash' Elijah Newren
2022-05-10 23:32   ` [PATCH v3 0/6] " Victoria Dye via GitGitGadget
2022-05-10 23:32     ` [PATCH v3 1/6] stash: expand sparse-checkout compatibility testing Victoria Dye via GitGitGadget
2022-05-10 23:32     ` [PATCH v3 2/6] stash: integrate with sparse index Victoria Dye via GitGitGadget
2022-05-10 23:32     ` [PATCH v3 3/6] sparse-index: expose 'is_sparse_index_allowed()' Victoria Dye via GitGitGadget
2022-05-10 23:32     ` Victoria Dye via GitGitGadget [this message]
2022-05-10 23:32     ` [PATCH v3 5/6] stash: apply stash using 'merge_ort_nonrecursive()' Victoria Dye via GitGitGadget
2022-05-11  0:26       ` Junio C Hamano
2022-05-12  1:01       ` Jonathan Tan
2022-05-12 14:52         ` Elijah Newren
2022-05-12 16:55           ` Jonathan Tan
2022-05-12 14:51       ` Elijah Newren
2022-05-10 23:32     ` [PATCH v3 6/6] unpack-trees: preserve index sparsity Victoria Dye via GitGitGadget

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