From fcf341890ef583f519bc2746940c048bb8261d3d Mon Sep 17 00:00:00 2001 From: Patrick Steinhardt Date: Mon, 13 May 2024 10:18:13 +0200 Subject: reftable/dump: support dumping a table's block structure We're about to introduce new configs that will allow users to have more control over how exactly reftables are written. To verify that these configs are effective we will need to take a peak into the actual blocks written by the reftable backend. Introduce a new mode to the dumping logic that prints out the block structure. This logic can be invoked via `test-tool dump-reftables -b`. Signed-off-by: Patrick Steinhardt Signed-off-by: Junio C Hamano --- reftable/reader.c | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) (limited to 'reftable/reader.c') diff --git a/reftable/reader.c b/reftable/reader.c index 481dff10d4..f23c8523db 100644 --- a/reftable/reader.c +++ b/reftable/reader.c @@ -856,3 +856,66 @@ done: reftable_reader_free(r); return err; } + +int reftable_reader_print_blocks(const char *tablename) +{ + struct { + const char *name; + int type; + } sections[] = { + { + .name = "ref", + .type = BLOCK_TYPE_REF, + }, + { + .name = "obj", + .type = BLOCK_TYPE_OBJ, + }, + { + .name = "log", + .type = BLOCK_TYPE_LOG, + }, + }; + struct reftable_block_source src = { 0 }; + struct table_iter ti = TABLE_ITER_INIT; + struct reftable_reader *r = NULL; + size_t i; + int err; + + err = reftable_block_source_from_file(&src, tablename); + if (err < 0) + goto done; + + err = reftable_new_reader(&r, &src, tablename); + if (err < 0) + goto done; + + printf("header:\n"); + printf(" block_size: %d\n", r->block_size); + + for (i = 0; i < ARRAY_SIZE(sections); i++) { + err = reader_start(r, &ti, sections[i].type, 0); + if (err < 0) + goto done; + if (err > 0) + continue; + + printf("%s:\n", sections[i].name); + + while (1) { + printf(" - length: %u\n", ti.br.block_len); + printf(" restarts: %u\n", ti.br.restart_count); + + err = table_iter_next_block(&ti); + if (err < 0) + goto done; + if (err > 0) + break; + } + } + +done: + reftable_reader_free(r); + table_iter_close(&ti); + return err; +} -- cgit v1.3