return git_index_file;
}
+int safe_create_leading_directories(char *path)
+{
+ char *pos = path;
+
+ while (pos) {
+ pos = strchr(pos, '/');
+ if (!pos)
+ break;
+ *pos = 0;
+ if (mkdir(path, 0777) < 0)
+ if (errno != EEXIST) {
+ *pos = '/';
+ return -1;
+ }
+ *pos++ = '/';
+ }
+ return 0;
+}
+
int get_sha1(const char *str, unsigned char *sha1)
{
- static char pathname[PATH_MAX];
static const char *prefix[] = {
"",
"refs",
if (!get_sha1_hex(str, sha1))
return 0;
- if (!git_dir)
- setup_git_env();
for (p = prefix; *p; p++) {
- snprintf(pathname, sizeof(pathname), "%s/%s/%s",
- git_dir, *p, str);
+ char * pathname = git_path("%s/%s", *p, str);
if (!get_sha1_file(pathname, sha1))
return 0;
}
static unsigned long pack_mapped;
struct packed_git *packed_git;
-struct pack_entry {
- unsigned int offset;
- unsigned char sha1[20];
- struct packed_git *p;
-};
-
static int check_packed_git_idx(const char *path, unsigned long *idx_size_,
void **idx_map_)
{
return -1;
index = idx_map;
+ *idx_map_ = idx_map;
+ *idx_size_ = idx_size;
/* check index map */
- if (idx_size < 4*256 + 20)
+ if (idx_size < 4*256 + 20 + 20)
return error("index file too small");
nr = 0;
for (i = 0; i < 256; i++) {
if (idx_size != 4*256 + nr * 24 + 20 + 20)
return error("wrong index file size");
- *idx_map_ = idx_map;
- *idx_size_ = idx_size;
return 0;
}
-static void unuse_one_packed_git(void)
+static int unuse_one_packed_git(void)
{
- /* NOTYET */
+ struct packed_git *p, *lru = NULL;
+
+ for (p = packed_git; p; p = p->next) {
+ if (p->pack_use_cnt || !p->pack_base)
+ continue;
+ if (!lru || p->pack_last_used < lru->pack_last_used)
+ lru = p;
+ }
+ if (!lru)
+ return 0;
+ munmap(lru->pack_base, lru->pack_size);
+ lru->pack_base = NULL;
+ return 1;
}
-static int use_packed_git(struct packed_git *p)
+void unuse_packed_git(struct packed_git *p)
+{
+ p->pack_use_cnt--;
+}
+
+int use_packed_git(struct packed_git *p)
{
if (!p->pack_base) {
int fd;
void *map;
pack_mapped += p->pack_size;
- while (PACK_MAX_SZ < pack_mapped)
- unuse_one_packed_git();
+ while (PACK_MAX_SZ < pack_mapped && unuse_one_packed_git())
+ ; /* nothing */
fd = open(p->pack_name, O_RDONLY);
if (fd < 0)
- return -1;
+ die("packfile %s cannot be opened", p->pack_name);
if (fstat(fd, &st)) {
close(fd);
- return -1;
+ die("packfile %s cannot be opened", p->pack_name);
}
if (st.st_size != p->pack_size)
- return -1;
+ die("packfile %s size mismatch.", p->pack_name);
map = mmap(NULL, p->pack_size, PROT_READ, MAP_PRIVATE, fd, 0);
close(fd);
if (map == MAP_FAILED)
- return -1;
+ die("packfile %s cannot be mapped.", p->pack_name);
p->pack_base = map;
+
+ /* Check if the pack file matches with the index file.
+ * this is cheap.
+ */
+ if (memcmp((char*)(p->index_base) + p->index_size - 40,
+ p->pack_base + p->pack_size - 20, 20))
+ die("packfile %s does not match index.", p->pack_name);
}
p->pack_last_used = pack_used_ctr++;
+ p->pack_use_cnt++;
return 0;
}
-static struct packed_git *add_packed_git(char *path, int path_len)
+struct packed_git *add_packed_git(char *path, int path_len)
{
struct stat st;
struct packed_git *p;
p->next = NULL;
p->pack_base = NULL;
p->pack_last_used = 0;
+ p->pack_use_cnt = 0;
return p;
}
p->next = packed_git;
packed_git = p;
}
+ closedir(dir);
}
void prepare_packed_git(void)
}
static void *map_sha1_file_internal(const unsigned char *sha1,
- unsigned long *size,
- int say_error)
+ unsigned long *size)
{
struct stat st;
void *map;
char *filename = find_sha1_file(sha1, &st);
if (!filename) {
- if (say_error)
- error("cannot map sha1 file %s", sha1_to_hex(sha1));
return NULL;
}
break;
/* Fallthrough */
case 0:
- if (say_error)
- perror(filename);
return NULL;
}
return map;
}
-void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
-{
- return map_sha1_file_internal(sha1, size, 1);
-}
-
int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size)
{
/* Get the data stream */
return inflate(stream, 0);
}
-void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size)
+static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size)
{
int bytes = strlen(buffer) + 1;
unsigned char *buf = xmalloc(1+size);
return unpack_sha1_rest(&stream, hdr, *size);
}
+/* forward declaration for a mutually recursive function */
+static int packed_object_info(struct pack_entry *entry,
+ char *type, unsigned long *sizep);
+
static int packed_delta_info(unsigned char *base_sha1,
unsigned long delta_size,
unsigned long left,
char *type,
- unsigned long *sizep)
+ unsigned long *sizep,
+ struct packed_git *p)
{
- unsigned char *data;
- unsigned char delta_head[64];
- int i;
- unsigned char cmd;
- unsigned long data_size, result_size, base_size, verify_base_size;
- z_stream stream;
- int st;
+ struct pack_entry base_ent;
if (left < 20)
die("truncated pack file");
- if (sha1_object_info(base_sha1, type, &base_size))
- die("cannot get info for delta-pack base");
- data = base_sha1 + 20;
- data_size = left - 20;
-
- memset(&stream, 0, sizeof(stream));
+ /* The base entry _must_ be in the same pack */
+ if (!find_pack_entry_one(base_sha1, &base_ent, p))
+ die("failed to find delta-pack base object %s",
+ sha1_to_hex(base_sha1));
- stream.next_in = data;
- stream.avail_in = data_size;
- stream.next_out = delta_head;
- stream.avail_out = sizeof(delta_head);
+ /* We choose to only get the type of the base object and
+ * ignore potentially corrupt pack file that expects the delta
+ * based on a base with a wrong size. This saves tons of
+ * inflate() calls.
+ */
- inflateInit(&stream);
- st = inflate(&stream, Z_FINISH);
- inflateEnd(&stream);
- if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head))
- die("delta data unpack-initial failed");
+ if (packed_object_info(&base_ent, type, NULL))
+ die("cannot get info for delta-pack base");
- /* Examine the initial part of the delta to figure out
- * the result size. Verify the base size while we are at it.
- */
- data = delta_head;
- verify_base_size = i = 0;
- cmd = *data++;
- while (cmd) {
- if (cmd & 1)
- verify_base_size |= *data++ << i;
- i += 8;
- cmd >>= 1;
- }
+ if (sizep) {
+ const unsigned char *data;
+ unsigned char delta_head[64];
+ unsigned long result_size;
+ z_stream stream;
+ int st;
+
+ memset(&stream, 0, sizeof(stream));
+
+ data = stream.next_in = base_sha1 + 20;
+ stream.avail_in = left - 20;
+ stream.next_out = delta_head;
+ stream.avail_out = sizeof(delta_head);
+
+ inflateInit(&stream);
+ st = inflate(&stream, Z_FINISH);
+ inflateEnd(&stream);
+ if ((st != Z_STREAM_END) &&
+ stream.total_out != sizeof(delta_head))
+ die("delta data unpack-initial failed");
+
+ /* Examine the initial part of the delta to figure out
+ * the result size.
+ */
+ data = delta_head;
+ get_delta_hdr_size(&data); /* ignore base size */
- /* Read the result size */
- result_size = i = 0;
- cmd = *data++;
- while (cmd) {
- if (cmd & 1)
- result_size |= *data++ << i;
- i += 8;
- cmd >>= 1;
+ /* Read the result size */
+ result_size = get_delta_hdr_size(&data);
+ *sizep = result_size;
}
- if (verify_base_size != base_size)
- die("delta base size mismatch");
-
- *sizep = result_size;
return 0;
}
static unsigned long unpack_object_header(struct packed_git *p, unsigned long offset,
enum object_type *type, unsigned long *sizep)
{
+ unsigned shift;
unsigned char *pack, c;
unsigned long size;
offset++;
*type = (c >> 4) & 7;
size = c & 15;
+ shift = 4;
while (c & 0x80) {
if (offset >= p->pack_size)
die("object offset outside of pack file");
c = *pack++;
offset++;
- size = (size << 7) | (c & 0x7f);
+ size += (c & 0x7f) << shift;
+ shift += 7;
}
*sizep = size;
return offset;
}
+void packed_object_info_detail(struct pack_entry *e,
+ char *type,
+ unsigned long *size,
+ unsigned long *store_size,
+ int *delta_chain_length,
+ unsigned char *base_sha1)
+{
+ struct packed_git *p = e->p;
+ unsigned long offset, left;
+ unsigned char *pack;
+ enum object_type kind;
+
+ offset = unpack_object_header(p, e->offset, &kind, size);
+ pack = p->pack_base + offset;
+ left = p->pack_size - offset;
+ if (kind != OBJ_DELTA)
+ *delta_chain_length = 0;
+ else {
+ int chain_length = 0;
+ memcpy(base_sha1, pack, 20);
+ do {
+ struct pack_entry base_ent;
+ unsigned long junk;
+
+ find_pack_entry_one(pack, &base_ent, p);
+ offset = unpack_object_header(p, base_ent.offset,
+ &kind, &junk);
+ pack = p->pack_base + offset;
+ chain_length++;
+ } while (kind == OBJ_DELTA);
+ *delta_chain_length = chain_length;
+ }
+ switch (kind) {
+ case OBJ_COMMIT:
+ strcpy(type, "commit");
+ break;
+ case OBJ_TREE:
+ strcpy(type, "tree");
+ break;
+ case OBJ_BLOB:
+ strcpy(type, "blob");
+ break;
+ case OBJ_TAG:
+ strcpy(type, "tag");
+ break;
+ default:
+ die("corrupted pack file");
+ }
+ *store_size = 0; /* notyet */
+}
+
static int packed_object_info(struct pack_entry *entry,
char *type, unsigned long *sizep)
{
unsigned long offset, size, left;
unsigned char *pack;
enum object_type kind;
+ int retval;
if (use_packed_git(p))
die("cannot map packed file");
switch (kind) {
case OBJ_DELTA:
- return packed_delta_info(pack, size, left, type, sizep);
- break;
+ retval = packed_delta_info(pack, size, left, type, sizep, p);
+ unuse_packed_git(p);
+ return retval;
case OBJ_COMMIT:
strcpy(type, "commit");
break;
default:
die("corrupted pack file");
}
- *sizep = size;
+ if (sizep)
+ *sizep = size;
+ unuse_packed_git(p);
return 0;
}
unsigned long delta_size,
unsigned long left,
char *type,
- unsigned long *sizep)
+ unsigned long *sizep,
+ struct packed_git *p)
{
+ struct pack_entry base_ent;
void *data, *delta_data, *result, *base;
unsigned long data_size, result_size, base_size;
z_stream stream;
if ((st != Z_STREAM_END) || stream.total_out != delta_size)
die("delta data unpack failed");
- /* This may recursively unpack the base, which is what we want */
- base = read_sha1_file(base_sha1, type, &base_size);
+ /* The base entry _must_ be in the same pack */
+ if (!find_pack_entry_one(base_sha1, &base_ent, p))
+ die("failed to find delta-pack base object %s",
+ sha1_to_hex(base_sha1));
+ base = unpack_entry_gently(&base_ent, type, &base_size);
if (!base)
die("failed to read delta-pack base object %s",
sha1_to_hex(base_sha1));
{
int st;
z_stream stream;
- char *buffer;
+ unsigned char *buffer;
buffer = xmalloc(size + 1);
buffer[size] = 0;
char *type, unsigned long *sizep)
{
struct packed_git *p = entry->p;
- unsigned long offset, size, left;
- unsigned char *pack;
- enum object_type kind;
+ void *retval;
if (use_packed_git(p))
die("cannot map packed file");
+ retval = unpack_entry_gently(entry, type, sizep);
+ unuse_packed_git(p);
+ if (!retval)
+ die("corrupted pack file");
+ return retval;
+}
+
+/* The caller is responsible for use_packed_git()/unuse_packed_git() pair */
+void *unpack_entry_gently(struct pack_entry *entry,
+ char *type, unsigned long *sizep)
+{
+ struct packed_git *p = entry->p;
+ unsigned long offset, size, left;
+ unsigned char *pack;
+ enum object_type kind;
+ void *retval;
offset = unpack_object_header(p, entry->offset, &kind, &size);
pack = p->pack_base + offset;
left = p->pack_size - offset;
switch (kind) {
case OBJ_DELTA:
- return unpack_delta_entry(pack, size, left, type, sizep);
+ retval = unpack_delta_entry(pack, size, left, type, sizep, p);
+ return retval;
case OBJ_COMMIT:
strcpy(type, "commit");
break;
strcpy(type, "tag");
break;
default:
- die("corrupted pack file");
+ return NULL;
}
*sizep = size;
- return unpack_non_delta_entry(pack, size, left);
+ retval = unpack_non_delta_entry(pack, size, left);
+ return retval;
}
int num_packed_objects(const struct packed_git *p)
{
- /* See check_packed_git_idx and pack-objects.c */
+ /* See check_packed_git_idx() */
return (p->index_size - 20 - 20 - 4*256) / 24;
}
return 0;
}
-static int find_pack_entry_1(const unsigned char *sha1,
- struct pack_entry *e, struct packed_git *p)
+int find_pack_entry_one(const unsigned char *sha1,
+ struct pack_entry *e, struct packed_git *p)
{
- int *level1_ofs = p->index_base;
+ unsigned int *level1_ofs = p->index_base;
int hi = ntohl(level1_ofs[*sha1]);
int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1]));
void *index = p->index_base + 256;
prepare_packed_git();
for (p = packed_git; p; p = p->next) {
- if (find_pack_entry_1(sha1, e, p))
+ if (find_pack_entry_one(sha1, e, p))
return 1;
}
return 0;
z_stream stream;
char hdr[128];
- map = map_sha1_file_internal(sha1, &mapsize, 0);
+ map = map_sha1_file_internal(sha1, &mapsize);
if (!map) {
struct pack_entry e;
if (!find_pack_entry(sha1, &e))
return error("unable to find %s", sha1_to_hex(sha1));
- if (!packed_object_info(&e, type, sizep))
- return 0;
- /* sheesh */
- map = unpack_entry(&e, type, sizep);
- free(map);
- return (map == NULL) ? 0 : -1;
+ return packed_object_info(&e, type, sizep);
}
if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0)
status = error("unable to unpack %s header",
status = error("unable to parse %s header", sha1_to_hex(sha1));
else {
status = 0;
- *sizep = size;
+ if (sizep)
+ *sizep = size;
}
inflateEnd(&stream);
munmap(map, mapsize);
{
unsigned long mapsize;
void *map, *buf;
+ struct pack_entry e;
- map = map_sha1_file_internal(sha1, &mapsize, 0);
+ if (find_pack_entry(sha1, &e))
+ return read_packed_sha1(sha1, type, size);
+ map = map_sha1_file_internal(sha1, &mapsize);
if (map) {
buf = unpack_sha1_file(map, mapsize, type, size);
munmap(map, mapsize);
return buf;
}
- return read_packed_sha1(sha1, type, size);
+ return NULL;
}
void *read_object_with_reference(const unsigned char *sha1,
}
}
-static char *write_sha1_file_prepare(void *buf,
- unsigned long len,
- const char *type,
- unsigned char *sha1,
- unsigned char *hdr,
- int *hdrlen)
+char *write_sha1_file_prepare(void *buf,
+ unsigned long len,
+ const char *type,
+ unsigned char *sha1,
+ unsigned char *hdr,
+ int *hdrlen)
{
SHA_CTX c;
return 0;
}
+int write_sha1_to_fd(int fd, const unsigned char *sha1)
+{
+ ssize_t size;
+ unsigned long objsize;
+ int posn = 0;
+ void *buf = map_sha1_file_internal(sha1, &objsize);
+ z_stream stream;
+ if (!buf) {
+ unsigned char *unpacked;
+ unsigned long len;
+ char type[20];
+ char hdr[50];
+ int hdrlen;
+ // need to unpack and recompress it by itself
+ unpacked = read_packed_sha1(sha1, type, &len);
+
+ hdrlen = sprintf(hdr, "%s %lu", type, len) + 1;
+
+ /* Set it up */
+ memset(&stream, 0, sizeof(stream));
+ deflateInit(&stream, Z_BEST_COMPRESSION);
+ size = deflateBound(&stream, len + hdrlen);
+ buf = xmalloc(size);
+
+ /* Compress it */
+ stream.next_out = buf;
+ stream.avail_out = size;
+
+ /* First header.. */
+ stream.next_in = (void *)hdr;
+ stream.avail_in = hdrlen;
+ while (deflate(&stream, 0) == Z_OK)
+ /* nothing */;
+
+ /* Then the data itself.. */
+ stream.next_in = unpacked;
+ stream.avail_in = len;
+ while (deflate(&stream, Z_FINISH) == Z_OK)
+ /* nothing */;
+ deflateEnd(&stream);
+
+ objsize = stream.total_out;
+ }
+
+ do {
+ size = write(fd, buf + posn, objsize - posn);
+ if (size <= 0) {
+ if (!size) {
+ fprintf(stderr, "write closed");
+ } else {
+ perror("write ");
+ }
+ return -1;
+ }
+ posn += size;
+ } while (posn < objsize);
+ return 0;
+}
+
int write_sha1_from_fd(const unsigned char *sha1, int fd)
{
char *filename = sha1_file_name(sha1);
return 0;
}
+int has_sha1_pack(const unsigned char *sha1)
+{
+ struct pack_entry e;
+ return find_pack_entry(sha1, &e);
+}
+
int has_sha1_file(const unsigned char *sha1)
{
struct stat st;
struct pack_entry e;
- if (find_sha1_file(sha1, &st))
+ if (find_pack_entry(sha1, &e))
return 1;
- return find_pack_entry(sha1, &e);
+ return find_sha1_file(sha1, &st) ? 1 : 0;
}
-int index_fd(unsigned char *sha1, int fd, struct stat *st)
+int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type)
{
unsigned long size = st->st_size;
void *buf;
int ret;
+ unsigned char hdr[50];
+ int hdrlen;
buf = "";
if (size)
if ((int)(long)buf == -1)
return -1;
- ret = write_sha1_file(buf, size, "blob", sha1);
+ if (!type)
+ type = "blob";
+ if (write_object)
+ ret = write_sha1_file(buf, size, type, sha1);
+ else {
+ write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen);
+ ret = 0;
+ }
if (size)
munmap(buf, size);
return ret;
projects / git.git / blobdiff