return NULL;
}
-#define PACK_MAX_SZ (1<<26)
static int pack_used_ctr;
static unsigned long pack_mapped;
struct packed_git *packed_git;
return 0;
}
-static int unuse_one_packed_git(void)
+static int unuse_one_window(void)
{
- struct packed_git *p, *lru = NULL;
+ struct packed_git *p, *lru_p = NULL;
+ struct pack_window *w, *w_l, *lru_w = NULL, *lru_l = 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;
+ for (w_l = NULL, w = p->windows; w; w = w->next) {
+ if (!w->inuse_cnt) {
+ if (!lru_w || w->last_used < lru_w->last_used) {
+ lru_p = p;
+ lru_w = w;
+ lru_l = w_l;
+ }
+ }
+ w_l = w;
+ }
}
- if (!lru)
- return 0;
- munmap(lru->pack_base, lru->pack_size);
- lru->pack_base = NULL;
- return 1;
+ if (lru_p) {
+ munmap(lru_w->base, lru_w->len);
+ pack_mapped -= lru_w->len;
+ if (lru_l)
+ lru_l->next = lru_w->next;
+ else {
+ lru_p->windows = lru_w->next;
+ if (!lru_p->windows) {
+ close(lru_p->pack_fd);
+ lru_p->pack_fd = -1;
+ }
+ }
+ free(lru_w);
+ return 1;
+ }
+ return 0;
}
-void unuse_packed_git(struct packed_git *p)
+void unuse_pack(struct pack_window **w_cursor)
{
- p->pack_use_cnt--;
+ struct pack_window *w = *w_cursor;
+ if (w) {
+ w->inuse_cnt--;
+ *w_cursor = NULL;
+ }
}
-int use_packed_git(struct packed_git *p)
+static void open_packed_git(struct packed_git *p)
{
+ struct stat st;
+ struct pack_header hdr;
+ unsigned char sha1[20];
+ unsigned char *idx_sha1;
+
+ p->pack_fd = open(p->pack_name, O_RDONLY);
+ if (p->pack_fd < 0 || fstat(p->pack_fd, &st))
+ die("packfile %s cannot be opened", p->pack_name);
+
+ /* If we created the struct before we had the pack we lack size. */
if (!p->pack_size) {
- struct stat st;
- /* We created the struct before we had the pack */
- stat(p->pack_name, &st);
if (!S_ISREG(st.st_mode))
die("packfile %s not a regular file", p->pack_name);
p->pack_size = st.st_size;
- }
- if (!p->pack_base) {
- int fd;
- struct stat st;
- void *map;
- struct pack_header *hdr;
-
+ } else if (p->pack_size != st.st_size)
+ die("packfile %s size changed", p->pack_name);
+
+ /* Verify we recognize this pack file format. */
+ read_or_die(p->pack_fd, &hdr, sizeof(hdr));
+ if (hdr.hdr_signature != htonl(PACK_SIGNATURE))
+ die("file %s is not a GIT packfile", p->pack_name);
+ if (!pack_version_ok(hdr.hdr_version))
+ die("packfile %s is version %u and not supported"
+ " (try upgrading GIT to a newer version)",
+ p->pack_name, ntohl(hdr.hdr_version));
+
+ /* Verify the pack matches its index. */
+ if (num_packed_objects(p) != ntohl(hdr.hdr_entries))
+ die("packfile %s claims to have %u objects"
+ " while index size indicates %u objects",
+ p->pack_name, ntohl(hdr.hdr_entries),
+ num_packed_objects(p));
+ if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1)
+ die("end of packfile %s is unavailable", p->pack_name);
+ read_or_die(p->pack_fd, sha1, sizeof(sha1));
+ idx_sha1 = ((unsigned char *)p->index_base) + p->index_size - 40;
+ if (hashcmp(sha1, idx_sha1))
+ die("packfile %s does not match index", p->pack_name);
+}
+
+unsigned char* use_pack(struct packed_git *p,
+ struct pack_window **w_cursor,
+ unsigned long offset,
+ unsigned int *left)
+{
+ struct pack_window *win = p->windows;
+
+ if (p->pack_fd == -1)
+ open_packed_git(p);
+ if (!win) {
pack_mapped += p->pack_size;
- while (PACK_MAX_SZ < pack_mapped && unuse_one_packed_git())
+ while (packed_git_limit < pack_mapped && unuse_one_window())
; /* nothing */
- fd = open(p->pack_name, O_RDONLY);
- if (fd < 0)
- die("packfile %s cannot be opened", p->pack_name);
- if (fstat(fd, &st)) {
- close(fd);
- die("packfile %s cannot be opened", p->pack_name);
- }
- if (st.st_size != p->pack_size)
- 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)
+ win = xcalloc(1, sizeof(*win));
+ win->len = p->pack_size;
+ win->base = mmap(NULL, p->pack_size, PROT_READ, MAP_PRIVATE, p->pack_fd, 0);
+ if (win->base == MAP_FAILED)
die("packfile %s cannot be mapped.", p->pack_name);
- p->pack_base = map;
-
- /* Check if we understand this pack file. If we don't we're
- * likely too old to handle it.
- */
- hdr = map;
- if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
- die("packfile %s isn't actually a pack.", p->pack_name);
- if (!pack_version_ok(hdr->hdr_version))
- die("packfile %s is version %i and not supported"
- " (try upgrading GIT to a newer version)",
- p->pack_name, ntohl(hdr->hdr_version));
-
- /* Check if the pack file matches with the index file.
- * this is cheap.
- */
- if (hashcmp((unsigned char *)(p->index_base) +
- p->index_size - 40,
- (unsigned char *)p->pack_base +
- p->pack_size - 20)) {
- die("packfile %s does not match index.", p->pack_name);
- }
+ p->windows = win;
}
- p->pack_last_used = pack_used_ctr++;
- p->pack_use_cnt++;
- return 0;
+ if (win != *w_cursor) {
+ win->last_used = pack_used_ctr++;
+ win->inuse_cnt++;
+ *w_cursor = win;
+ }
+ if (left)
+ *left = win->len - offset;
+ return win->base + offset;
}
struct packed_git *add_packed_git(char *path, int path_len, int local)
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;
+ p->windows = NULL;
+ p->pack_fd = -1;
p->pack_local = local;
if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1))
hashcpy(p->sha1, sha1);
p->pack_size = 0;
p->index_base = idx_map;
p->next = NULL;
- p->pack_base = NULL;
- p->pack_last_used = 0;
- p->pack_use_cnt = 0;
+ p->windows = NULL;
+ p->pack_fd = -1;
hashcpy(p->sha1, sha1);
return p;
}
prepare_packed_git_run_once = 1;
}
-static void reprepare_packed_git(void)
+void reprepare_packed_git(void)
{
prepare_packed_git_run_once = 0;
prepare_packed_git();
return unpack_sha1_rest(&stream, hdr, *size);
}
+static unsigned long get_delta_base(struct packed_git *p,
+ struct pack_window **w_curs,
+ unsigned long offset,
+ enum object_type kind,
+ unsigned long delta_obj_offset,
+ unsigned long *base_obj_offset)
+{
+ unsigned char *base_info = use_pack(p, w_curs, offset, NULL);
+ unsigned long base_offset;
+
+ /* use_pack() assured us we have [base_info, base_info + 20)
+ * as a range that we can look at without walking off the
+ * end of the mapped window. Its actually the hash size
+ * that is assured. An OFS_DELTA longer than the hash size
+ * is stupid, as then a REF_DELTA would be smaller to store.
+ */
+ if (kind == OBJ_OFS_DELTA) {
+ unsigned used = 0;
+ unsigned char c = base_info[used++];
+ base_offset = c & 127;
+ while (c & 128) {
+ base_offset += 1;
+ if (!base_offset || base_offset & ~(~0UL >> 7))
+ die("offset value overflow for delta base object");
+ c = base_info[used++];
+ base_offset = (base_offset << 7) + (c & 127);
+ }
+ base_offset = delta_obj_offset - base_offset;
+ if (base_offset >= delta_obj_offset)
+ die("delta base offset out of bound");
+ offset += used;
+ } else if (kind == OBJ_REF_DELTA) {
+ /* The base entry _must_ be in the same pack */
+ base_offset = find_pack_entry_one(base_info, p);
+ if (!base_offset)
+ die("failed to find delta-pack base object %s",
+ sha1_to_hex(base_info));
+ offset += 20;
+ } else
+ die("I am totally screwed");
+ *base_obj_offset = base_offset;
+ return offset;
+}
+
/* forward declaration for a mutually recursive function */
static int packed_object_info(struct packed_git *p, unsigned long offset,
char *type, unsigned long *sizep);
static int packed_delta_info(struct packed_git *p,
+ struct pack_window **w_curs,
unsigned long offset,
+ enum object_type kind,
+ unsigned long obj_offset,
char *type,
unsigned long *sizep)
{
unsigned long base_offset;
- unsigned char *base_sha1 = (unsigned char *) p->pack_base + offset;
- if (p->pack_size < offset + 20)
- die("truncated pack file");
- /* The base entry _must_ be in the same pack */
- base_offset = find_pack_entry_one(base_sha1, p);
- if (!base_offset)
- die("failed to find delta-pack base object %s",
- sha1_to_hex(base_sha1));
- offset += 20;
+ offset = get_delta_base(p, w_curs, offset, kind,
+ obj_offset, &base_offset);
/* We choose to only get the type of the base object and
* ignore potentially corrupt pack file that expects the delta
if (sizep) {
const unsigned char *data;
- unsigned char delta_head[64];
+ unsigned char delta_head[20], *in;
unsigned long result_size;
z_stream stream;
int st;
memset(&stream, 0, sizeof(stream));
-
- stream.next_in = (unsigned char *) p->pack_base + offset;
- stream.avail_in = p->pack_size - offset;
stream.next_out = delta_head;
stream.avail_out = sizeof(delta_head);
inflateInit(&stream);
- st = inflate(&stream, Z_FINISH);
+ do {
+ in = use_pack(p, w_curs, offset, &stream.avail_in);
+ stream.next_in = in;
+ st = inflate(&stream, Z_FINISH);
+ offset += stream.next_in - in;
+ } while ((st == Z_OK || st == Z_BUF_ERROR)
+ && stream.total_out < sizeof(delta_head));
inflateEnd(&stream);
if ((st != Z_STREAM_END) &&
stream.total_out != sizeof(delta_head))
return 0;
}
-static unsigned long unpack_object_header(struct packed_git *p, unsigned long offset,
- enum object_type *type, unsigned long *sizep)
+static unsigned long unpack_object_header(struct packed_git *p,
+ struct pack_window **w_curs,
+ unsigned long offset,
+ enum object_type *type,
+ unsigned long *sizep)
{
+ unsigned char *base;
+ unsigned int left;
unsigned long used;
- if (p->pack_size <= offset)
- die("object offset outside of pack file");
-
- used = unpack_object_header_gently((unsigned char *)p->pack_base +
- offset,
- p->pack_size - offset, type, sizep);
+ /* use_pack() assures us we have [base, base + 20) available
+ * as a range that we can look at at. (Its actually the hash
+ * size that is assurred.) With our object header encoding
+ * the maximum deflated object size is 2^137, which is just
+ * insane, so we know won't exceed what we have been given.
+ */
+ base = use_pack(p, w_curs, offset, &left);
+ used = unpack_object_header_gently(base, left, type, sizep);
if (!used)
die("object offset outside of pack file");
return offset + used;
}
-int check_reuse_pack_delta(struct packed_git *p, unsigned long offset,
- unsigned char *base, unsigned long *sizep,
- enum object_type *kindp)
-{
- unsigned long ptr;
- int status = -1;
-
- use_packed_git(p);
- ptr = offset;
- ptr = unpack_object_header(p, ptr, kindp, sizep);
- if (*kindp != OBJ_DELTA)
- goto done;
- hashcpy(base, (unsigned char *) p->pack_base + ptr);
- status = 0;
- done:
- unuse_packed_git(p);
- return status;
-}
-
void packed_object_info_detail(struct packed_git *p,
unsigned long offset,
char *type,
unsigned int *delta_chain_length,
unsigned char *base_sha1)
{
- unsigned long val;
+ struct pack_window *w_curs = NULL;
+ unsigned long obj_offset, val;
unsigned char *next_sha1;
enum object_type kind;
*delta_chain_length = 0;
- offset = unpack_object_header(p, offset, &kind, size);
+ obj_offset = offset;
+ offset = unpack_object_header(p, &w_curs, offset, &kind, size);
for (;;) {
switch (kind) {
default:
- die("corrupted pack file %s containing object of kind %d",
+ die("pack %s contains unknown object type %d",
p->pack_name, kind);
case OBJ_COMMIT:
case OBJ_TREE:
case OBJ_TAG:
strcpy(type, type_names[kind]);
*store_size = 0; /* notyet */
+ unuse_pack(&w_curs);
return;
- case OBJ_DELTA:
- if (p->pack_size <= offset + 20)
- die("pack file %s records an incomplete delta base",
- p->pack_name);
- next_sha1 = (unsigned char *) p->pack_base + offset;
+ case OBJ_OFS_DELTA:
+ get_delta_base(p, &w_curs, offset, kind,
+ obj_offset, &offset);
+ if (*delta_chain_length == 0) {
+ /* TODO: find base_sha1 as pointed by offset */
+ }
+ break;
+ case OBJ_REF_DELTA:
+ next_sha1 = use_pack(p, &w_curs, offset, NULL);
if (*delta_chain_length == 0)
hashcpy(base_sha1, next_sha1);
offset = find_pack_entry_one(next_sha1, p);
break;
}
- offset = unpack_object_header(p, offset, &kind, &val);
+ obj_offset = offset;
+ offset = unpack_object_header(p, &w_curs, offset, &kind, &val);
(*delta_chain_length)++;
}
}
static int packed_object_info(struct packed_git *p, unsigned long offset,
char *type, unsigned long *sizep)
{
- unsigned long size;
+ struct pack_window *w_curs = NULL;
+ unsigned long size, obj_offset = offset;
enum object_type kind;
+ int r;
- offset = unpack_object_header(p, offset, &kind, &size);
-
- if (kind == OBJ_DELTA)
- return packed_delta_info(p, offset, type, sizep);
+ offset = unpack_object_header(p, &w_curs, offset, &kind, &size);
switch (kind) {
+ case OBJ_OFS_DELTA:
+ case OBJ_REF_DELTA:
+ r = packed_delta_info(p, &w_curs, offset, kind,
+ obj_offset, type, sizep);
+ unuse_pack(&w_curs);
+ return r;
case OBJ_COMMIT:
case OBJ_TREE:
case OBJ_BLOB:
case OBJ_TAG:
strcpy(type, type_names[kind]);
+ unuse_pack(&w_curs);
break;
default:
- die("corrupted pack file %s containing object of kind %d",
+ die("pack %s contains unknown object type %d",
p->pack_name, kind);
}
if (sizep)
}
static void *unpack_compressed_entry(struct packed_git *p,
+ struct pack_window **w_curs,
unsigned long offset,
unsigned long size)
{
int st;
z_stream stream;
- unsigned char *buffer;
+ unsigned char *buffer, *in;
buffer = xmalloc(size + 1);
buffer[size] = 0;
memset(&stream, 0, sizeof(stream));
- stream.next_in = (unsigned char*)p->pack_base + offset;
- stream.avail_in = p->pack_size - offset;
stream.next_out = buffer;
stream.avail_out = size;
inflateInit(&stream);
- st = inflate(&stream, Z_FINISH);
+ do {
+ in = use_pack(p, w_curs, offset, &stream.avail_in);
+ stream.next_in = in;
+ st = inflate(&stream, Z_FINISH);
+ offset += stream.next_in - in;
+ } while (st == Z_OK || st == Z_BUF_ERROR);
inflateEnd(&stream);
if ((st != Z_STREAM_END) || stream.total_out != size) {
free(buffer);
}
static void *unpack_delta_entry(struct packed_git *p,
+ struct pack_window **w_curs,
unsigned long offset,
unsigned long delta_size,
+ enum object_type kind,
+ unsigned long obj_offset,
char *type,
unsigned long *sizep)
{
void *delta_data, *result, *base;
unsigned long result_size, base_size, base_offset;
- unsigned char *base_sha1;
-
- if (p->pack_size < offset + 20)
- die("truncated pack file");
- /* The base entry _must_ be in the same pack */
- base_sha1 = (unsigned char*)p->pack_base + offset;
- base_offset = find_pack_entry_one(base_sha1, p);
- if (!base_offset)
- die("failed to find delta-pack base object %s",
- sha1_to_hex(base_sha1));
- offset += 20;
-
- base = unpack_entry_gently(p, base_offset, type, &base_size);
+
+ offset = get_delta_base(p, w_curs, offset, kind,
+ obj_offset, &base_offset);
+ base = unpack_entry(p, base_offset, type, &base_size);
if (!base)
die("failed to read delta base object at %lu from %s",
base_offset, p->pack_name);
- delta_data = unpack_compressed_entry(p, offset, delta_size);
+ delta_data = unpack_compressed_entry(p, w_curs, offset, delta_size);
result = patch_delta(base, base_size,
delta_data, delta_size,
&result_size);
return result;
}
-static void *unpack_entry(struct pack_entry *entry,
- char *type, unsigned long *sizep)
-{
- struct packed_git *p = entry->p;
- void *retval;
-
- if (use_packed_git(p))
- die("cannot map packed file");
- retval = unpack_entry_gently(p, entry->offset, type, sizep);
- unuse_packed_git(p);
- if (!retval)
- die("corrupted pack file %s", p->pack_name);
- return retval;
-}
-
-/* The caller is responsible for use_packed_git()/unuse_packed_git() pair */
-void *unpack_entry_gently(struct packed_git *p, unsigned long offset,
+void *unpack_entry(struct packed_git *p, unsigned long offset,
char *type, unsigned long *sizep)
{
- unsigned long size;
+ struct pack_window *w_curs = NULL;
+ unsigned long size, obj_offset = offset;
enum object_type kind;
+ void *retval;
- offset = unpack_object_header(p, offset, &kind, &size);
+ offset = unpack_object_header(p, &w_curs, offset, &kind, &size);
switch (kind) {
- case OBJ_DELTA:
- return unpack_delta_entry(p, offset, size, type, sizep);
+ case OBJ_OFS_DELTA:
+ case OBJ_REF_DELTA:
+ retval = unpack_delta_entry(p, &w_curs, offset, size,
+ kind, obj_offset, type, sizep);
+ break;
case OBJ_COMMIT:
case OBJ_TREE:
case OBJ_BLOB:
case OBJ_TAG:
strcpy(type, type_names[kind]);
*sizep = size;
- return unpack_compressed_entry(p, offset, size);
+ retval = unpack_compressed_entry(p, &w_curs, offset, size);
+ break;
default:
- return NULL;
+ die("unknown object type %i in %s", kind, p->pack_name);
}
+ unuse_pack(&w_curs);
+ return retval;
}
int num_packed_objects(const struct packed_git *p)
return 0;
}
+static int matches_pack_name(struct packed_git *p, const char *ig)
+{
+ const char *last_c, *c;
+
+ if (!strcmp(p->pack_name, ig))
+ return 0;
+
+ for (c = p->pack_name, last_c = c; *c;)
+ if (*c == '/')
+ last_c = ++c;
+ else
+ ++c;
+ if (!strcmp(last_c, ig))
+ return 0;
+
+ return 1;
+}
+
static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e, const char **ignore_packed)
{
struct packed_git *p;
if (ignore_packed) {
const char **ig;
for (ig = ignore_packed; *ig; ig++)
- if (!strcmp(p->pack_name, *ig))
+ if (!matches_pack_name(p, *ig))
break;
if (*ig)
continue;
}
-int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep)
+static int sha1_loose_object_info(const unsigned char *sha1, char *type, unsigned long *sizep)
{
int status;
unsigned long mapsize, size;
char hdr[128];
map = map_sha1_file(sha1, &mapsize);
- if (!map) {
- struct pack_entry e;
-
- if (!find_pack_entry(sha1, &e, NULL)) {
- reprepare_packed_git();
- if (!find_pack_entry(sha1, &e, NULL))
- return error("unable to find %s", sha1_to_hex(sha1));
- }
- if (use_packed_git(e.p))
- die("cannot map packed file");
- status = packed_object_info(e.p, e.offset, type, sizep);
- unuse_packed_git(e.p);
- return status;
- }
+ if (!map)
+ return error("unable to find %s", sha1_to_hex(sha1));
if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0)
status = error("unable to unpack %s header",
sha1_to_hex(sha1));
return status;
}
+int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep)
+{
+ struct pack_entry e;
+
+ if (!find_pack_entry(sha1, &e, NULL)) {
+ reprepare_packed_git();
+ if (!find_pack_entry(sha1, &e, NULL))
+ return sha1_loose_object_info(sha1, type, sizep);
+ }
+ return packed_object_info(e.p, e.offset, type, sizep);
+}
+
static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size)
{
struct pack_entry e;
error("cannot read sha1_file for %s", sha1_to_hex(sha1));
return NULL;
}
- return unpack_entry(&e, type, size);
+ return unpack_entry(e.p, e.offset, type, size);
}
void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size)
dir = strrchr(filename, '/');
if (dir) {
*dir = 0;
- mkdir(filename, 0777);
- if (adjust_shared_perm(filename))
+ if (!mkdir(filename, 0777) && adjust_shared_perm(filename)) {
+ *dir = '/';
return -2;
+ }
*dir = '/';
if (!link(tmpfile, filename))
return 0;
unlink(tmpfile);
if (ret) {
if (ret != EEXIST) {
- fprintf(stderr, "unable to write sha1 filename %s: %s\n", filename, strerror(ret));
- return -1;
+ return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret));
}
/* FIXME!!! Collision check here ? */
}
}
if (errno != ENOENT) {
- fprintf(stderr, "sha1 file %s: %s\n", filename, strerror(errno));
- return -1;
+ return error("sha1 file %s: %s\n", filename, strerror(errno));
}
snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory());
fd = mkstemp(tmpfile);
if (fd < 0) {
- fprintf(stderr, "unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
- return -1;
+ if (errno == EPERM)
+ return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
+ else
+ return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
}
/* Set it up */
snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory());
local = mkstemp(tmpfile);
- if (local < 0)
- return error("Couldn't open %s for %s",
- tmpfile, sha1_to_hex(sha1));
+ if (local < 0) {
+ if (errno == EPERM)
+ return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
+ else
+ return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
+ }
memset(&stream, 0, sizeof(stream));
projects / thirdparty / git.git / blobdiff