[PATCH 7/7] t: invert `GIT_TEST_WRITE_REV_INDEX`

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Back in e8c58f894b (t: support GIT_TEST_WRITE_REV_INDEX, 2021-01-25), we
added a test knob to conditionally enable writing a ".rev" file when
indexing a pack. At the time, this was used to ensure that the test
suite worked even when ".rev" files were written, which served as a
stress-test for the on-disk reverse index implementation.

Now that reading from on-disk ".rev" files is enabled by default, the
test knob `GIT_TEST_WRITE_REV_INDEX` no longer has any meaning.

We could get rid of the option entirely, but there would be no
convenient way to test Git when ".rev" files *aren't* in place.

Instead of getting rid of the option, invert its meaning to instead
disable writing ".rev" files, thereby running the test suite in a mode
where the reverse index is generated from scratch.

This ensures that we are still running and exercising Git's behavior
when forced to generate reverse indexes from scratch.

Signed-off-by: Taylor Blau <me@xxxxxxxxxxxx>
---
 builtin/index-pack.c      | 4 ++--
 builtin/pack-objects.c    | 4 ++--
 ci/run-build-and-tests.sh | 1 -
 pack-revindex.h           | 2 +-
 t/README                  | 2 +-
 t/t5325-reverse-index.sh  | 2 +-
 6 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/builtin/index-pack.c b/builtin/index-pack.c
index 323c063f9d..9e36c985cf 100644
--- a/builtin/index-pack.c
+++ b/builtin/index-pack.c
@@ -1758,8 +1758,8 @@ int cmd_index_pack(int argc, const char **argv, const char *prefix)
 	if (prefix && chdir(prefix))
 		die(_("Cannot come back to cwd"));
 
-	if (git_env_bool(GIT_TEST_WRITE_REV_INDEX, 0))
-		rev_index = 1;
+	if (git_env_bool(GIT_TEST_NO_WRITE_REV_INDEX, 0))
+		rev_index = 0;
 	else
 		rev_index = !!(opts.flags & (WRITE_REV_VERIFY | WRITE_REV));
 
diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
index dbaa04482f..1797871ce9 100644
--- a/builtin/pack-objects.c
+++ b/builtin/pack-objects.c
@@ -4295,8 +4295,8 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix)
 	reset_pack_idx_option(&pack_idx_opts);
 	pack_idx_opts.flags |= WRITE_REV;
 	git_config(git_pack_config, NULL);
-	if (git_env_bool(GIT_TEST_WRITE_REV_INDEX, 0))
-		pack_idx_opts.flags |= WRITE_REV;
+	if (git_env_bool(GIT_TEST_NO_WRITE_REV_INDEX, 0))
+		pack_idx_opts.flags &= ~WRITE_REV;
 
 	progress = isatty(2);
 	argc = parse_options(argc, argv, prefix, pack_objects_options,
diff --git a/ci/run-build-and-tests.sh b/ci/run-build-and-tests.sh
index b098e10f52..e9fbfb6345 100755
--- a/ci/run-build-and-tests.sh
+++ b/ci/run-build-and-tests.sh
@@ -27,7 +27,6 @@ linux-TEST-vars)
 	export GIT_TEST_MULTI_PACK_INDEX=1
 	export GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP=1
 	export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
-	export GIT_TEST_WRITE_REV_INDEX=1
 	export GIT_TEST_CHECKOUT_WORKERS=2
 	;;
 linux-clang)
diff --git a/pack-revindex.h b/pack-revindex.h
index ef8afee88b..46e834064e 100644
--- a/pack-revindex.h
+++ b/pack-revindex.h
@@ -34,7 +34,7 @@
 #define RIDX_SIGNATURE 0x52494458 /* "RIDX" */
 #define RIDX_VERSION 1
 
-#define GIT_TEST_WRITE_REV_INDEX "GIT_TEST_WRITE_REV_INDEX"
+#define GIT_TEST_NO_WRITE_REV_INDEX "GIT_TEST_NO_WRITE_REV_INDEX"
 #define GIT_TEST_REV_INDEX_DIE_IN_MEMORY "GIT_TEST_REV_INDEX_DIE_IN_MEMORY"
 #define GIT_TEST_REV_INDEX_DIE_ON_DISK "GIT_TEST_REV_INDEX_DIE_ON_DISK"
 
diff --git a/t/README b/t/README
index 29576c3748..bdfac4cceb 100644
--- a/t/README
+++ b/t/README
@@ -475,7 +475,7 @@ GIT_TEST_DEFAULT_HASH=<hash-algo> specifies which hash algorithm to
 use in the test scripts. Recognized values for <hash-algo> are "sha1"
 and "sha256".
 
-GIT_TEST_WRITE_REV_INDEX=<boolean>, when true enables the
+GIT_TEST_NO_WRITE_REV_INDEX=<boolean>, when true disables the
 'pack.writeReverseIndex' setting.
 
 GIT_TEST_SPARSE_INDEX=<boolean>, when true enables index writes to use the
diff --git a/t/t5325-reverse-index.sh b/t/t5325-reverse-index.sh
index 149dcf5193..0548fce1aa 100755
--- a/t/t5325-reverse-index.sh
+++ b/t/t5325-reverse-index.sh
@@ -7,7 +7,7 @@ TEST_PASSES_SANITIZE_LEAK=true
 
 # The below tests want control over the 'pack.writeReverseIndex' setting
 # themselves to assert various combinations of it with other options.
-sane_unset GIT_TEST_WRITE_REV_INDEX
+sane_unset GIT_TEST_NO_WRITE_REV_INDEX
 
 packdir=.git/objects/pack
 
-- 
2.40.0.323.g9c80379958



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