Now that the scaffolding for reading the pseudo-merge extension has been
laid, teach the pack-bitmap machinery to read the pseudo-merge extension
when present.
Note that pseudo-merges themselves are not yet used during traversal,
this step will be taken by a future commit.
In the meantime, read the table and initialize the pseudo_merge_map
structure introduced by a previous commit. When the pseudo-merge
extension is present, `load_bitmap_header()` performs basic sanity
checks to make sure that the table is well-formed.
Signed-off-by: Taylor Blau <me@xxxxxxxxxxxx>
---
pack-bitmap.c | 39 +++++++++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/pack-bitmap.c b/pack-bitmap.c
index 3519edb896b..fc9c3e2fc43 100644
--- a/pack-bitmap.c
+++ b/pack-bitmap.c
@@ -20,6 +20,7 @@
#include "list-objects-filter-options.h"
#include "midx.h"
#include "config.h"
+#include "pseudo-merge.h"
/*
* An entry on the bitmap index, representing the bitmap for a given
@@ -86,6 +87,9 @@ struct bitmap_index {
*/
unsigned char *table_lookup;
+ /* This contains the pseudo-merge cache within 'map' (if found). */
+ struct pseudo_merge_map pseudo_merges;
+
/*
* Extended index.
*
@@ -205,6 +209,41 @@ static int load_bitmap_header(struct bitmap_index *index)
index->table_lookup = (void *)(index_end - table_size);
index_end -= table_size;
}
+
+ if (flags & BITMAP_OPT_PSEUDO_MERGES) {
+ unsigned char *pseudo_merge_ofs;
+ size_t table_size;
+ uint32_t i;
+
+ if (sizeof(table_size) > index_end - index->map - header_size)
+ return error(_("corrupted bitmap index file (too short to fit pseudo-merge table header)"));
+
+ table_size = get_be64(index_end - 8);
+ if (table_size > index_end - index->map - header_size)
+ return error(_("corrupted bitmap index file (too short to fit pseudo-merge table)"));
+
+ if (git_env_bool("GIT_TEST_USE_PSEUDO_MERGES", 1)) {
+ const unsigned char *ext = (index_end - table_size);
+
+ index->pseudo_merges.map = index->map;
+ index->pseudo_merges.map_size = index->map_size;
+ index->pseudo_merges.commits = ext + get_be64(index_end - 16);
+ index->pseudo_merges.commits_nr = get_be32(index_end - 20);
+ index->pseudo_merges.nr = get_be32(index_end - 24);
+
+ CALLOC_ARRAY(index->pseudo_merges.v,
+ index->pseudo_merges.nr);
+
+ pseudo_merge_ofs = index_end - 24 -
+ (index->pseudo_merges.nr * sizeof(uint64_t));
+ for (i = 0; i < index->pseudo_merges.nr; i++) {
+ index->pseudo_merges.v[i].at = get_be64(pseudo_merge_ofs);
+ pseudo_merge_ofs += sizeof(uint64_t);
+ }
+ }
+
+ index_end -= table_size;
+ }
}
index->entry_count = ntohl(header->entry_count);
--
2.45.0.23.gc6f94b99219
