#include <dirent.h>
#include "cache.h"
#include "delta.h"
+#include "pack.h"
#ifndef O_NOATIME
#if defined(__linux__) && (defined(__i386__) || defined(__PPC__))
return base;
}
-static struct alternate_object_database {
- char *base;
- char *name;
-} *alt_odb;
+struct alternate_object_database *alt_odb;
/*
* Prepare alternate object database registry.
* pointed by base fields of the array elements with one xmalloc();
* the string pool immediately follows the array.
*/
-static void prepare_alt_odb(void)
+void prepare_alt_odb(void)
{
int pass, totlen, i;
const char *cp, *last;
char *op = NULL;
const char *alt = gitenv(ALTERNATE_DB_ENVIRONMENT) ? : "";
+ if (alt_odb)
+ return;
/* The first pass counts how large an area to allocate to
* hold the entire alt_odb structure, including array of
* structs and path buffers for them. The second pass fills
if (!stat(name, st))
return name;
- if (!alt_odb)
- prepare_alt_odb();
+ prepare_alt_odb();
for (i = 0; (name = alt_odb[i].name) != NULL; i++) {
fill_sha1_path(name, sha1);
if (!stat(alt_odb[i].base, st))
#define PACK_MAX_SZ (1<<26)
static int pack_used_ctr;
static unsigned long pack_mapped;
-static struct packed_git {
- struct packed_git *next;
- unsigned long index_size;
- unsigned long pack_size;
- unsigned int *index_base;
- void *pack_base;
- unsigned int pack_last_used;
- char pack_name[0]; /* something like ".git/objects/pack/xxxxx.pack" */
-} *packed_git;
+struct packed_git *packed_git;
struct pack_entry {
unsigned int offset;
index = idx_map;
/* 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++) {
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->pack_size = st.st_size;
p->index_base = idx_map;
p->next = NULL;
+ p->pack_base = NULL;
p->pack_last_used = 0;
+ p->pack_use_cnt = 0;
return p;
}
}
}
-static void prepare_packed_git(void)
+void prepare_packed_git(void)
{
int i;
static int run_once = 0;
return;
prepare_packed_git_one(get_object_directory());
- if (!alt_odb)
- prepare_alt_odb();
+ prepare_alt_odb();
for (i = 0; alt_odb[i].base != NULL; i++) {
alt_odb[i].name[0] = 0;
prepare_packed_git_one(alt_odb[i].base);
return unpack_sha1_rest(&stream, hdr, *size);
}
-/* Returns 0 on fast-path success, returns 1 on deltified
- * and need to unpack to see info.
- */
+static int packed_delta_info(unsigned char *base_sha1,
+ unsigned long delta_size,
+ unsigned long left,
+ char *type,
+ unsigned long *sizep)
+{
+ const unsigned char *data;
+ unsigned char delta_head[64];
+ unsigned long result_size, base_size, verify_base_size;
+ z_stream stream;
+ int st;
+
+ if (left < 20)
+ die("truncated pack file");
+ if (sha1_object_info(base_sha1, type, &base_size))
+ die("cannot get info for delta-pack base");
+
+ 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. Verify the base size while we are at it.
+ */
+ data = delta_head;
+ verify_base_size = get_delta_hdr_size(&data);
+ if (verify_base_size != base_size)
+ die("delta base size mismatch");
+
+ /* Read the result size */
+ result_size = get_delta_hdr_size(&data);
+ *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;
+
+ if (offset >= p->pack_size)
+ die("object offset outside of pack file");
+
+ pack = p->pack_base + offset;
+ c = *pack++;
+ 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 += (c & 0x7f) << shift;
+ shift += 7;
+ }
+ *sizep = size;
+ return offset;
+}
+
static int packed_object_info(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;
+ int retval;
- offset = entry->offset;
- if (p->pack_size - 5 < offset)
- die("object offset outside of pack file");
+ if (use_packed_git(p))
+ die("cannot map packed file");
+
+ offset = unpack_object_header(p, entry->offset, &kind, &size);
pack = p->pack_base + offset;
- size = (pack[1] << 24) + (pack[2] << 16) + (pack[3] << 8) + pack[4];
- left = p->pack_size - offset - 5;
- switch (*pack) {
- case 'D':
- return 1;
- break;
- case 'C':
+ left = p->pack_size - offset;
+
+ switch (kind) {
+ case OBJ_DELTA:
+ retval = packed_delta_info(pack, size, left, type, sizep);
+ unuse_packed_git(p);
+ return retval;
+ case OBJ_COMMIT:
strcpy(type, "commit");
break;
- case 'T':
+ case OBJ_TREE:
strcpy(type, "tree");
break;
- case 'B':
+ case OBJ_BLOB:
strcpy(type, "blob");
break;
+ case OBJ_TAG:
+ strcpy(type, "tag");
+ break;
default:
die("corrupted pack file");
}
*sizep = size;
+ unuse_packed_git(p);
return 0;
}
struct packed_git *p = entry->p;
unsigned long offset, size, left;
unsigned char *pack;
-
- offset = entry->offset;
- if (p->pack_size - 5 < offset)
- die("object offset outside of pack file");
+ enum object_type kind;
+ void *retval;
if (use_packed_git(p))
die("cannot map packed file");
+ offset = unpack_object_header(p, entry->offset, &kind, &size);
pack = p->pack_base + offset;
- size = (pack[1] << 24) + (pack[2] << 16) + (pack[3] << 8) + pack[4];
- left = p->pack_size - offset - 5;
- switch (*pack) {
- case 'D':
- return unpack_delta_entry(pack+5, size, left, type, sizep);
- case 'C':
+ left = p->pack_size - offset;
+ switch (kind) {
+ case OBJ_DELTA:
+ retval = unpack_delta_entry(pack, size, left, type, sizep);
+ unuse_packed_git(p);
+ return retval;
+ case OBJ_COMMIT:
strcpy(type, "commit");
break;
- case 'T':
+ case OBJ_TREE:
strcpy(type, "tree");
break;
- case 'B':
+ case OBJ_BLOB:
strcpy(type, "blob");
break;
+ case OBJ_TAG:
+ strcpy(type, "tag");
+ break;
default:
die("corrupted pack file");
}
*sizep = size;
- return unpack_non_delta_entry(pack+5, size, left);
+ retval = unpack_non_delta_entry(pack, size, left);
+ unuse_packed_git(p);
+ return retval;
+}
+
+int num_packed_objects(const struct packed_git *p)
+{
+ /* See check_packed_git_idx() */
+ return (p->index_size - 20 - 20 - 4*256) / 24;
+}
+
+int nth_packed_object_sha1(const struct packed_git *p, int n,
+ unsigned char* sha1)
+{
+ void *index = p->index_base + 256;
+ if (n < 0 || num_packed_objects(p) <= n)
+ return -1;
+ memcpy(sha1, (index + 24 * n + 4), 20);
+ return 0;
}
static int find_pack_entry_1(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)
+{
+ SHA_CTX c;
+
+ /* Generate the header */
+ *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1;
+
+ /* Sha1.. */
+ SHA1_Init(&c);
+ SHA1_Update(&c, hdr, *hdrlen);
+ SHA1_Update(&c, buf, len);
+ SHA1_Final(sha1, &c);
+
+ return sha1_file_name(sha1);
+}
+
int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1)
{
int size;
unsigned char *compressed;
z_stream stream;
unsigned char sha1[20];
- SHA_CTX c;
char *filename;
static char tmpfile[PATH_MAX];
unsigned char hdr[50];
int fd, hdrlen, ret;
- /* Generate the header */
- hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1;
-
- /* Sha1.. */
- SHA1_Init(&c);
- SHA1_Update(&c, hdr, hdrlen);
- SHA1_Update(&c, buf, len);
- SHA1_Final(sha1, &c);
-
+ /* Normally if we have it in the pack then we do not bother writing
+ * it out into .git/objects/??/?{38} file.
+ */
+ filename = write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
if (returnsha1)
memcpy(returnsha1, sha1, 20);
-
- filename = sha1_file_name(sha1);
+ if (has_sha1_file(sha1))
+ return 0;
fd = open(filename, O_RDONLY);
if (fd >= 0) {
/*
projects / git.git / blobdiff