[PATCH v3 6/6] pack-objects: create GIT_TEST_PACK_SPARSE

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From: Derrick Stolee <dstolee@xxxxxxxxxxxxx>

Create a test variable GIT_TEST_PACK_SPARSE to enable the sparse
object walk algorithm by default during the test suite. Enabling
this variable ensures coverage in many interesting cases, such as
shallow clones, partial clones, and missing objects.

Signed-off-by: Derrick Stolee <dstolee@xxxxxxxxxxxxx>
---
 builtin/pack-objects.c         | 1 +
 t/README                       | 4 ++++
 t/t5322-pack-objects-sparse.sh | 6 +++---
 3 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
index 124b1bafc4..507d381153 100644
--- a/builtin/pack-objects.c
+++ b/builtin/pack-objects.c
@@ -3331,6 +3331,7 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix)
 
 	read_replace_refs = 0;
 
+	sparse = git_env_bool("GIT_TEST_PACK_SPARSE", 0);
 	reset_pack_idx_option(&pack_idx_opts);
 	git_config(git_pack_config, NULL);
 
diff --git a/t/README b/t/README
index 28711cc508..8b6dfe1864 100644
--- a/t/README
+++ b/t/README
@@ -342,6 +342,10 @@ GIT_TEST_INDEX_VERSION=<n> exercises the index read/write code path
 for the index version specified.  Can be set to any valid version
 (currently 2, 3, or 4).
 
+GIT_TEST_PACK_SPARSE=<boolean> if enabled will default the pack-objects
+builtin to use the sparse object walk. This can still be overridden by
+the --no-sparse command-line argument.
+
 GIT_TEST_PRELOAD_INDEX=<boolean> exercises the preload-index code path
 by overriding the minimum number of cache entries required per thread.
 
diff --git a/t/t5322-pack-objects-sparse.sh b/t/t5322-pack-objects-sparse.sh
index 8f5699bd91..e8cf41d1c6 100755
--- a/t/t5322-pack-objects-sparse.sh
+++ b/t/t5322-pack-objects-sparse.sh
@@ -36,7 +36,7 @@ test_expect_success 'setup repo' '
 '
 
 test_expect_success 'non-sparse pack-objects' '
-	git pack-objects --stdout --revs <packinput.txt >nonsparse.pack &&
+	git pack-objects --stdout --revs --no-sparse <packinput.txt >nonsparse.pack &&
 	git index-pack -o nonsparse.idx nonsparse.pack &&
 	git show-index <nonsparse.idx | awk "{print \$2}" >nonsparse_objects.txt &&
 	test_cmp expect_objects.txt nonsparse_objects.txt
@@ -70,7 +70,7 @@ test_expect_success 'duplicate a folder from f3 and commit to topic1' '
 '
 
 test_expect_success 'non-sparse pack-objects' '
-	git pack-objects --stdout --revs <packinput.txt >nonsparse.pack &&
+	git pack-objects --stdout --revs --no-sparse <packinput.txt >nonsparse.pack &&
 	git index-pack -o nonsparse.idx nonsparse.pack &&
 	git show-index <nonsparse.idx | awk "{print \$2}" >nonsparse_objects.txt &&
 	test_cmp expect_objects.txt nonsparse_objects.txt
@@ -102,7 +102,7 @@ test_expect_success 'non-sparse pack-objects' '
 		topic1			\
 		topic1^{tree}		\
 		topic1:f3 | sort >expect_objects.txt &&
-	git pack-objects --stdout --revs <packinput.txt >nonsparse.pack &&
+	git pack-objects --stdout --revs --no-sparse <packinput.txt >nonsparse.pack &&
 	git index-pack -o nonsparse.idx nonsparse.pack &&
 	git show-index <nonsparse.idx | awk "{print \$2}" >nonsparse_objects.txt &&
 	test_cmp expect_objects.txt nonsparse_objects.txt
-- 
gitgitgadget



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