#include "fsck.h"
static int dry_run, quiet, recover, has_errors, strict;
-static const char unpack_usage[] = "git-unpack-objects [-n] [-q] [-r] [--strict] < pack-file";
+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 unsigned int offset, len;
static off_t consumed_bytes;
-static SHA_CTX ctx;
+static git_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;
if (min > sizeof(buffer))
die("cannot fill %d bytes", min);
if (offset) {
- SHA1_Update(&ctx, buffer, offset);
+ git_SHA1_Update(&ctx, buffer, offset);
memmove(buffer, buffer + offset, len);
offset = 0;
}
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];
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)
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)
{
- 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 = 0;
+ 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);
blob->object.flags |= FLAG_WRITTEN;
else
die("invalid blob object");
- obj_list[nr].obj = 0;
+ 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));
- /* buf is stored via add_object_buffer and in obj, if its a tree or commit */
add_object_buffer(obj, buf, size);
obj->flags |= FLAG_OPEN;
obj_list[nr].obj = obj;
write_object(nr, type, result, result_size);
}
+/*
+ * 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)
{
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,
unsigned nr)
{
void *delta_data, *base;
unsigned long base_size;
unsigned char base_sha1[20];
- struct object *obj;
if (type == OBJ_REF_DELTA) {
hashcpy(base_sha1, fill(20));
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;
base_offset = (base_offset << 7) + (c & 127);
}
base_offset = obj_list[nr].offset - base_offset;
+ if (base_offset <= 0 || base_offset >= obj_list[nr].offset)
+ die("offset value out of bound for delta base object");
delta_data = get_data(delta_size);
if (dry_run || !delta_data) {
}
}
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;
}
}
- obj = lookup_object(base_sha1);
- if (obj) {
- struct obj_buffer *obj_buf = lookup_object_buffer(obj);
- if (obj_buf) {
- resolve_delta(nr, obj->type, obj_buf->buffer, obj_buf->size, 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) {
if (ntohl(hdr->hdr_signature) != PACK_SIGNATURE)
die("bad pack file");
if (!pack_version_ok(hdr->hdr_version))
- die("unknown pack file version %d", ntohl(hdr->hdr_version));
+ die("unknown pack file version %"PRIu32,
+ ntohl(hdr->hdr_version));
use(sizeof(struct pack_header));
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));
+ obj_list = xcalloc(nr_objects, sizeof(*obj_list));
for (i = 0; i < nr_objects; i++) {
unpack_one(i);
display_progress(progress, i + 1);
int i;
unsigned char sha1[20];
- git_config(git_default_config);
+ git_config(git_default_config, NULL);
quiet = !isatty(2);
/* We don't take any non-flag arguments now.. Maybe some day */
usage(unpack_usage);
}
- SHA1_Init(&ctx);
+ git_SHA1_Init(&ctx);
unpack_all();
- SHA1_Update(&ctx, buffer, offset);
- SHA1_Final(sha1, &ctx);
+ git_SHA1_Update(&ctx, buffer, offset);
+ git_SHA1_Final(sha1, &ctx);
if (strict)
write_rest();
if (hashcmp(fill(20), sha1))
projects / git.git / blobdiff