[PATCH v2 13/13] reftable: "test-tool dump-reftable" command.

["Han-Wen Nienhuys via GitGitGadget" <gitgitgadget@gmail.com>]

From: Han-Wen Nienhuys <hanwen@google.com>

This command dumps individual tables or a stack of of tables.

Signed-off-by: Han-Wen Nienhuys <hanwen@google.com>
---
 Makefile                 |  2 ++
 reftable/iter.c          |  6 +++---
 reftable/reader.c        | 22 +++++++++++-----------
 t/helper/test-reftable.c |  5 +++++
 t/helper/test-tool.c     |  1 +
 t/helper/test-tool.h     |  1 +
 6 files changed, 23 insertions(+), 14 deletions(-)

diff --git a/Makefile b/Makefile
index 05021f79a1..5f92e5cfc2 100644
--- a/Makefile
+++ b/Makefile
@@ -2391,6 +2391,8 @@ REFTABLE_OBJS += reftable/writer.o
 REFTABLE_OBJS += reftable/zlib-compat.o
 
 REFTABLE_TEST_OBJS += reftable/block_test.o
+REFTABLE_TEST_OBJS += reftable/dump.o
+REFTABLE_TEST_OBJS += reftable/merged_test.o
 REFTABLE_TEST_OBJS += reftable/record_test.o
 REFTABLE_TEST_OBJS += reftable/refname_test.o
 REFTABLE_TEST_OBJS += reftable/reftable_test.o
diff --git a/reftable/iter.c b/reftable/iter.c
index 2cff447323..80bc65e07d 100644
--- a/reftable/iter.c
+++ b/reftable/iter.c
@@ -59,7 +59,7 @@ void reftable_iterator_destroy(struct reftable_iterator *it)
 int reftable_iterator_next_ref(struct reftable_iterator *it,
 			       struct reftable_ref_record *ref)
 {
-	struct reftable_record rec = { 0 };
+	struct reftable_record rec = { NULL };
 	reftable_record_from_ref(&rec, ref);
 	return iterator_next(it, &rec);
 }
@@ -67,7 +67,7 @@ int reftable_iterator_next_ref(struct reftable_iterator *it,
 int reftable_iterator_next_log(struct reftable_iterator *it,
 			       struct reftable_log_record *log)
 {
-	struct reftable_record rec = { 0 };
+	struct reftable_record rec = { NULL };
 	reftable_record_from_log(&rec, log);
 	return iterator_next(it, &rec);
 }
@@ -95,7 +95,7 @@ static int filtering_ref_iterator_next(void *iter_arg,
 		}
 
 		if (fri->double_check) {
-			struct reftable_iterator it = { 0 };
+			struct reftable_iterator it = { NULL };
 
 			err = reftable_table_seek_ref(&fri->tab, &it,
 						      ref->refname);
diff --git a/reftable/reader.c b/reftable/reader.c
index c7f56b5fdc..8d3f63b0d8 100644
--- a/reftable/reader.c
+++ b/reftable/reader.c
@@ -161,8 +161,8 @@ static int parse_footer(struct reftable_reader *r, uint8_t *footer,
 int init_reader(struct reftable_reader *r, struct reftable_block_source *source,
 		const char *name)
 {
-	struct reftable_block footer = { 0 };
-	struct reftable_block header = { 0 };
+	struct reftable_block footer = { NULL };
+	struct reftable_block header = { NULL };
 	int err = 0;
 
 	memset(r, 0, sizeof(struct reftable_reader));
@@ -270,7 +270,7 @@ int reader_init_block_reader(struct reftable_reader *r, struct block_reader *br,
 {
 	int32_t guess_block_size = r->block_size ? r->block_size :
 							 DEFAULT_BLOCK_SIZE;
-	struct reftable_block block = { 0 };
+	struct reftable_block block = { NULL };
 	uint8_t block_typ = 0;
 	int err = 0;
 	uint32_t header_off = next_off ? 0 : header_size(r->version);
@@ -477,9 +477,9 @@ static int reader_seek_indexed(struct reftable_reader *r,
 			       struct reftable_record *rec)
 {
 	struct reftable_index_record want_index = { .last_key = STRBUF_INIT };
-	struct reftable_record want_index_rec = { 0 };
+	struct reftable_record want_index_rec = { NULL };
 	struct reftable_index_record index_result = { .last_key = STRBUF_INIT };
-	struct reftable_record index_result_rec = { 0 };
+	struct reftable_record index_result_rec = { NULL };
 	struct table_iter index_iter = TABLE_ITER_INIT;
 	struct table_iter next = TABLE_ITER_INIT;
 	int err = 0;
@@ -584,7 +584,7 @@ int reftable_reader_seek_ref(struct reftable_reader *r,
 	struct reftable_ref_record ref = {
 		.refname = (char *)name,
 	};
-	struct reftable_record rec = { 0 };
+	struct reftable_record rec = { NULL };
 	reftable_record_from_ref(&rec, &ref);
 	return reader_seek(r, it, &rec);
 }
@@ -597,7 +597,7 @@ int reftable_reader_seek_log_at(struct reftable_reader *r,
 		.refname = (char *)name,
 		.update_index = update_index,
 	};
-	struct reftable_record rec = { 0 };
+	struct reftable_record rec = { NULL };
 	reftable_record_from_log(&rec, &log);
 	return reader_seek(r, it, &rec);
 }
@@ -644,10 +644,10 @@ static int reftable_reader_refs_for_indexed(struct reftable_reader *r,
 		.hash_prefix = oid,
 		.hash_prefix_len = r->object_id_len,
 	};
-	struct reftable_record want_rec = { 0 };
-	struct reftable_iterator oit = { 0 };
-	struct reftable_obj_record got = { 0 };
-	struct reftable_record got_rec = { 0 };
+	struct reftable_record want_rec = { NULL };
+	struct reftable_iterator oit = { NULL };
+	struct reftable_obj_record got = { NULL };
+	struct reftable_record got_rec = { NULL };
 	int err = 0;
 	struct indexed_table_ref_iter *itr = NULL;
 
diff --git a/t/helper/test-reftable.c b/t/helper/test-reftable.c
index def8883439..aff4fbccda 100644
--- a/t/helper/test-reftable.c
+++ b/t/helper/test-reftable.c
@@ -13,3 +13,8 @@ int cmd__reftable(int argc, const char **argv)
 	tree_test_main(argc, argv);
 	return 0;
 }
+
+int cmd__dump_reftable(int argc, const char **argv)
+{
+	return reftable_dump_main(argc, (char *const *)argv);
+}
diff --git a/t/helper/test-tool.c b/t/helper/test-tool.c
index c7ab5bc4a6..ce27041ab2 100644
--- a/t/helper/test-tool.c
+++ b/t/helper/test-tool.c
@@ -54,6 +54,7 @@ static struct test_cmd cmds[] = {
 	{ "read-midx", cmd__read_midx },
 	{ "ref-store", cmd__ref_store },
 	{ "reftable", cmd__reftable },
+	{ "dump-reftable", cmd__dump_reftable },
 	{ "regex", cmd__regex },
 	{ "repository", cmd__repository },
 	{ "revision-walking", cmd__revision_walking },
diff --git a/t/helper/test-tool.h b/t/helper/test-tool.h
index fa2b11ace6..8b5790d93f 100644
--- a/t/helper/test-tool.h
+++ b/t/helper/test-tool.h
@@ -17,6 +17,7 @@ int cmd__dump_cache_tree(int argc, const char **argv);
 int cmd__dump_fsmonitor(int argc, const char **argv);
 int cmd__dump_split_index(int argc, const char **argv);
 int cmd__dump_untracked_cache(int argc, const char **argv);
+int cmd__dump_reftable(int argc, const char **argv);
 int cmd__example_decorate(int argc, const char **argv);
 int cmd__genrandom(int argc, const char **argv);
 int cmd__genzeros(int argc, const char **argv);
-- 
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