[PATCH v6 1/3] reftable/stack: expose option to disable auto-compaction

["Justin Tobler via GitGitGadget" <gitgitgadget@gmail.com>]

From: Justin Tobler <jltobler@gmail.com>

The reftable stack already has a variable to configure whether or not to
run auto-compaction, but it is inaccessible to users of the library.
There exist use cases where a caller may want to have more control over
auto-compaction.

Move the `disable_auto_compact` option into `reftable_write_options` to
allow external callers to disable auto-compaction. This will be used in
a subsequent commit.

Signed-off-by: Justin Tobler <jltobler@gmail.com>
---
 reftable/reftable-writer.h |  3 +++
 reftable/stack.c           |  2 +-
 reftable/stack.h           |  1 -
 reftable/stack_test.c      | 11 ++++++-----
 4 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/reftable/reftable-writer.h b/reftable/reftable-writer.h
index 7c7cae5f99b..155bf0bbe2a 100644
--- a/reftable/reftable-writer.h
+++ b/reftable/reftable-writer.h
@@ -46,6 +46,9 @@ struct reftable_write_options {
 	 *   is a single line, and add '\n' if missing.
 	 */
 	unsigned exact_log_message : 1;
+
+	/* boolean: Prevent auto-compaction of tables. */
+	unsigned disable_auto_compact : 1;
 };
 
 /* reftable_block_stats holds statistics for a single block type */
diff --git a/reftable/stack.c b/reftable/stack.c
index dde50b61d69..1a7cdad12c9 100644
--- a/reftable/stack.c
+++ b/reftable/stack.c
@@ -680,7 +680,7 @@ int reftable_addition_commit(struct reftable_addition *add)
 	if (err)
 		goto done;
 
-	if (!add->stack->disable_auto_compact) {
+	if (!add->stack->config.disable_auto_compact) {
 		/*
 		 * Auto-compact the stack to keep the number of tables in
 		 * control. It is possible that a concurrent writer is already
diff --git a/reftable/stack.h b/reftable/stack.h
index d919455669e..c862053025f 100644
--- a/reftable/stack.h
+++ b/reftable/stack.h
@@ -19,7 +19,6 @@ struct reftable_stack {
 	int list_fd;
 
 	char *reftable_dir;
-	int disable_auto_compact;
 
 	struct reftable_write_options config;
 
diff --git a/reftable/stack_test.c b/reftable/stack_test.c
index 351e35bd86d..4fec823f14f 100644
--- a/reftable/stack_test.c
+++ b/reftable/stack_test.c
@@ -325,7 +325,7 @@ static void test_reftable_stack_transaction_api_performs_auto_compaction(void)
 		 * we can ensure that we indeed honor this setting and have
 		 * better control over when exactly auto compaction runs.
 		 */
-		st->disable_auto_compact = i != n;
+		st->config.disable_auto_compact = i != n;
 
 		err = reftable_stack_new_addition(&add, st);
 		EXPECT_ERR(err);
@@ -497,6 +497,7 @@ static void test_reftable_stack_add(void)
 	struct reftable_write_options cfg = {
 		.exact_log_message = 1,
 		.default_permissions = 0660,
+		.disable_auto_compact = 1,
 	};
 	struct reftable_stack *st = NULL;
 	char *dir = get_tmp_dir(__LINE__);
@@ -508,7 +509,6 @@ static void test_reftable_stack_add(void)
 
 	err = reftable_new_stack(&st, dir, cfg);
 	EXPECT_ERR(err);
-	st->disable_auto_compact = 1;
 
 	for (i = 0; i < N; i++) {
 		char buf[256];
@@ -935,7 +935,9 @@ static void test_empty_add(void)
 
 static void test_reftable_stack_auto_compaction(void)
 {
-	struct reftable_write_options cfg = { 0 };
+	struct reftable_write_options cfg = {
+		.disable_auto_compact = 1,
+	};
 	struct reftable_stack *st = NULL;
 	char *dir = get_tmp_dir(__LINE__);
 
@@ -945,7 +947,6 @@ static void test_reftable_stack_auto_compaction(void)
 	err = reftable_new_stack(&st, dir, cfg);
 	EXPECT_ERR(err);
 
-	st->disable_auto_compact = 1; /* call manually below for coverage. */
 	for (i = 0; i < N; i++) {
 		char name[100];
 		struct reftable_ref_record ref = {
@@ -994,7 +995,7 @@ static void test_reftable_stack_add_performs_auto_compaction(void)
 		 * we can ensure that we indeed honor this setting and have
 		 * better control over when exactly auto compaction runs.
 		 */
-		st->disable_auto_compact = i != n;
+		st->config.disable_auto_compact = i != n;
 
 		strbuf_reset(&refname);
 		strbuf_addf(&refname, "branch-%04d", i);
-- 
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