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index 1e51865c52231e80cfdbbb19c8b6fa86ee8855d2..fecf0be7796f34fbb06a6bbbe61e9e3d042f6780 100644 (file)
--- a/builtin-unpack-objects.c
+++ b/builtin-unpack-objects.c
#include "commit.h"
#include "tag.h"
#include "tree.h"
+#include "tree-walk.h"
#include "progress.h"
+#include "decorate.h"
+#include "fsck.h"
-static int dry_run, quiet, recover, has_errors;
-static const char unpack_usage[] = "git-unpack-objects [-n] [-q] [-r] < pack-file";
+static int dry_run, quiet, recover, has_errors, strict;
+static const char unpack_usage[] = "git-unpack-objects [-n] [-q] [-r] [--strict] < pack-file";
/* We always read in 4kB chunks. */
static unsigned char buffer[4096];
static off_t consumed_bytes;
static SHA_CTX ctx;
+/*
+ * When running under --strict mode, objects whose reachability are
+ * suspect are kept in core without getting written in the object
+ * store.
+ */
+struct obj_buffer {
+ char *buffer;
+ unsigned long size;
+};
+
+static struct decoration obj_decorate;
+
+static struct obj_buffer *lookup_object_buffer(struct object *base)
+{
+ return lookup_decoration(&obj_decorate, base);
+}
+
+static void add_object_buffer(struct object *object, char *buffer, unsigned long size)
+{
+ struct obj_buffer *obj;
+ obj = xcalloc(1, sizeof(struct obj_buffer));
+ obj->buffer = buffer;
+ obj->size = size;
+ if (add_decoration(&obj_decorate, object, obj))
+ die("object %s tried to add buffer twice!", sha1_to_hex(object->sha1));
+}
+
/*
* Make sure at least "min" bytes are available in the buffer, and
* return the pointer to the buffer.
struct obj_info {
off_t offset;
unsigned char sha1[20];
+ struct object *obj;
};
+#define FLAG_OPEN (1u<<20)
+#define FLAG_WRITTEN (1u<<21)
+
static struct obj_info *obj_list;
+unsigned nr_objects;
+
+/*
+ * Called only from check_object() after it verified this object
+ * is Ok.
+ */
+static void write_cached_object(struct object *obj)
+{
+ unsigned char sha1[20];
+ struct obj_buffer *obj_buf = lookup_object_buffer(obj);
+ if (write_sha1_file(obj_buf->buffer, obj_buf->size, typename(obj->type), sha1) < 0)
+ die("failed to write object %s", sha1_to_hex(obj->sha1));
+ obj->flags |= FLAG_WRITTEN;
+}
+
+/*
+ * At the very end of the processing, write_rest() scans the objects
+ * that have reachability requirements and calls this function.
+ * Verify its reachability and validity recursively and write it out.
+ */
+static int check_object(struct object *obj, int type, void *data)
+{
+ if (!obj)
+ return 0;
+
+ if (obj->flags & FLAG_WRITTEN)
+ return 1;
+
+ if (type != OBJ_ANY && obj->type != type)
+ die("object type mismatch");
+
+ if (!(obj->flags & FLAG_OPEN)) {
+ unsigned long size;
+ int type = sha1_object_info(obj->sha1, &size);
+ if (type != obj->type || type <= 0)
+ die("object of unexpected type");
+ obj->flags |= FLAG_WRITTEN;
+ return 1;
+ }
+
+ if (fsck_object(obj, 1, fsck_error_function))
+ die("Error in object");
+ if (!fsck_walk(obj, check_object, 0))
+ die("Error on reachable objects of %s", sha1_to_hex(obj->sha1));
+ write_cached_object(obj);
+ return 1;
+}
+
+static void write_rest(void)
+{
+ unsigned i;
+ for (i = 0; i < nr_objects; i++)
+ check_object(obj_list[i].obj, OBJ_ANY, 0);
+}
static void added_object(unsigned nr, enum object_type type,
void *data, unsigned long size);
+/*
+ * Write out nr-th object from the list, now we know the contents
+ * of it. Under --strict, this buffers structured objects in-core,
+ * to be checked at the end.
+ */
static void write_object(unsigned nr, enum object_type type,
void *buf, unsigned long size)
{
- if (write_sha1_file(buf, size, typename(type), obj_list[nr].sha1) < 0)
- die("failed to write object");
- added_object(nr, type, buf, size);
+ if (!strict) {
+ if (write_sha1_file(buf, size, typename(type), obj_list[nr].sha1) < 0)
+ die("failed to write object");
+ added_object(nr, type, buf, size);
+ free(buf);
+ obj_list[nr].obj = NULL;
+ } else if (type == OBJ_BLOB) {
+ struct blob *blob;
+ if (write_sha1_file(buf, size, typename(type), obj_list[nr].sha1) < 0)
+ die("failed to write object");
+ added_object(nr, type, buf, size);
+ free(buf);
+
+ blob = lookup_blob(obj_list[nr].sha1);
+ if (blob)
+ blob->object.flags |= FLAG_WRITTEN;
+ else
+ die("invalid blob object");
+ obj_list[nr].obj = NULL;
+ } else {
+ struct object *obj;
+ int eaten;
+ hash_sha1_file(buf, size, typename(type), obj_list[nr].sha1);
+ added_object(nr, type, buf, size);
+ obj = parse_object_buffer(obj_list[nr].sha1, type, size, buf, &eaten);
+ if (!obj)
+ die("invalid %s", typename(type));
+ add_object_buffer(obj, buf, size);
+ obj->flags |= FLAG_OPEN;
+ obj_list[nr].obj = obj;
+ }
}
static void resolve_delta(unsigned nr, enum object_type type,
die("failed to apply delta");
free(delta);
write_object(nr, type, result, result_size);
- free(result);
}
+/*
+ * We now know the contents of an object (which is nr-th in the pack);
+ * resolve all the deltified objects that are based on it.
+ */
static void added_object(unsigned nr, enum object_type type,
void *data, unsigned long size)
{
if (!dry_run && buf)
write_object(nr, type, buf, size);
- free(buf);
+ else
+ free(buf);
+}
+
+static int resolve_against_held(unsigned nr, const unsigned char *base,
+ void *delta_data, unsigned long delta_size)
+{
+ struct object *obj;
+ struct obj_buffer *obj_buffer;
+ obj = lookup_object(base);
+ if (!obj)
+ return 0;
+ obj_buffer = lookup_object_buffer(obj);
+ if (!obj_buffer)
+ return 0;
+ resolve_delta(nr, obj->type, obj_buffer->buffer,
+ obj_buffer->size, delta_data, delta_size);
+ return 1;
}
static void unpack_delta_entry(enum object_type type, unsigned long delta_size,
@@ -198,7 +339,13 @@ static void unpack_delta_entry(enum object_type type, unsigned long delta_size,
free(delta_data);
return;
}
- if (!has_sha1_file(base_sha1)) {
+ if (has_sha1_file(base_sha1))
+ ; /* Ok we have this one */
+ else if (resolve_against_held(nr, base_sha1,
+ delta_data, delta_size))
+ return; /* we are done */
+ else {
+ /* cannot resolve yet --- queue it */
hashcpy(obj_list[nr].sha1, null_sha1);
add_delta_to_list(nr, base_sha1, 0, delta_data, delta_size);
return;
@@ -244,14 +391,19 @@ static void unpack_delta_entry(enum object_type type, unsigned long delta_size,
}
}
if (!base_found) {
- /* The delta base object is itself a delta that
- has not been resolved yet. */
+ /*
+ * The delta base object is itself a delta that
+ * has not been resolved yet.
+ */
hashcpy(obj_list[nr].sha1, null_sha1);
add_delta_to_list(nr, null_sha1, base_offset, delta_data, delta_size);
return;
}
}
+ if (resolve_against_held(nr, base_sha1, delta_data, delta_size))
+ return;
+
base = read_sha1_file(base_sha1, &type, &base_size);
if (!base) {
error("failed to read delta-pack base object %s",
int i;
struct progress *progress = NULL;
struct pack_header *hdr = fill(sizeof(struct pack_header));
- unsigned nr_objects = ntohl(hdr->hdr_entries);
+
+ nr_objects = ntohl(hdr->hdr_entries);
if (ntohl(hdr->hdr_signature) != PACK_SIGNATURE)
die("bad pack file");
if (!quiet)
progress = start_progress("Unpacking objects", nr_objects);
obj_list = xmalloc(nr_objects * sizeof(*obj_list));
+ memset(obj_list, 0, nr_objects * sizeof(*obj_list));
for (i = 0; i < nr_objects; i++) {
unpack_one(i);
display_progress(progress, i + 1);
recover = 1;
continue;
}
+ if (!strcmp(arg, "--strict")) {
+ strict = 1;
+ continue;
+ }
if (!prefixcmp(arg, "--pack_header=")) {
struct pack_header *hdr;
char *c;
unpack_all();
SHA1_Update(&ctx, buffer, offset);
SHA1_Final(sha1, &ctx);
+ if (strict)
+ write_rest();
if (hashcmp(fill(20), sha1))
die("final sha1 did not match");
use(20);