#endif
#endif
+#ifdef NO_C99_FORMAT
+#define SZ_FMT "lu"
+#else
+#define SZ_FMT "zu"
+#endif
+
const unsigned char null_sha1[20];
static unsigned int sha1_file_open_flag = O_NOATIME;
-static unsigned hexval(char c)
-{
- if (c >= '0' && c <= '9')
- return c - '0';
- if (c >= 'a' && c <= 'f')
- return c - 'a' + 10;
- if (c >= 'A' && c <= 'F')
- return c - 'A' + 10;
- return ~0;
-}
+signed char hexval_table[256] = {
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 00-07 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 08-0f */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 10-17 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 18-1f */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 20-27 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 28-2f */
+ 0, 1, 2, 3, 4, 5, 6, 7, /* 30-37 */
+ 8, 9, -1, -1, -1, -1, -1, -1, /* 38-3f */
+ -1, 10, 11, 12, 13, 14, 15, -1, /* 40-47 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 48-4f */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 50-57 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 58-5f */
+ -1, 10, 11, 12, 13, 14, 15, -1, /* 60-67 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 68-67 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 70-77 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 78-7f */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 80-87 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 88-8f */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 90-97 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* 98-9f */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* a0-a7 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* a8-af */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* b0-b7 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* b8-bf */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* c0-c7 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* c8-cf */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* d0-d7 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* d8-df */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* e0-e7 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* e8-ef */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* f0-f7 */
+ -1, -1, -1, -1, -1, -1, -1, -1, /* f8-ff */
+};
int get_sha1_hex(const char *hex, unsigned char *sha1)
{
/*
* NOTE! This returns a statically allocated buffer, so you have to be
- * careful about using it. Do a "strdup()" if you need to save the
+ * careful about using it. Do a "xstrdup()" if you need to save the
* filename.
*
* Also note that this returns the location for creating. Reading
close(fd);
return;
}
- map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+ map = xmmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
close(fd);
- if (map == MAP_FAILED)
- return;
link_alt_odb_entries(map, map + st.st_size, '\n', relative_base, depth);
return NULL;
}
-#define PACK_MAX_SZ (1<<26)
-static int pack_used_ctr;
-static unsigned long pack_mapped;
+static unsigned int pack_used_ctr;
+static unsigned int pack_mmap_calls;
+static unsigned int peak_pack_open_windows;
+static unsigned int pack_open_windows;
+static size_t peak_pack_mapped;
+static size_t pack_mapped;
+static size_t page_size;
struct packed_git *packed_git;
+void pack_report()
+{
+ fprintf(stderr,
+ "pack_report: getpagesize() = %10" SZ_FMT "\n"
+ "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n"
+ "pack_report: core.packedGitLimit = %10" SZ_FMT "\n",
+ page_size,
+ packed_git_window_size,
+ packed_git_limit);
+ fprintf(stderr,
+ "pack_report: pack_used_ctr = %10u\n"
+ "pack_report: pack_mmap_calls = %10u\n"
+ "pack_report: pack_open_windows = %10u / %10u\n"
+ "pack_report: pack_mapped = "
+ "%10" SZ_FMT " / %10" SZ_FMT "\n",
+ pack_used_ctr,
+ pack_mmap_calls,
+ pack_open_windows, peak_pack_open_windows,
+ pack_mapped, peak_pack_mapped);
+}
+
static int check_packed_git_idx(const char *path, unsigned long *idx_size_,
void **idx_map_)
{
return -1;
}
idx_size = st.st_size;
- idx_map = mmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0);
+ idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0);
close(fd);
- if (idx_map == MAP_FAILED)
- return -1;
index = idx_map;
*idx_map_ = idx_map;
return 0;
}
-static int unuse_one_packed_git(void)
+static void scan_windows(struct packed_git *p,
+ struct packed_git **lru_p,
+ struct pack_window **lru_w,
+ struct pack_window **lru_l)
{
- struct packed_git *p, *lru = NULL;
+ struct pack_window *w, *w_l;
- 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;
}
-void unuse_packed_git(struct packed_git *p)
+static int unuse_one_window(struct packed_git *current)
+{
+ struct packed_git *p, *lru_p = NULL;
+ struct pack_window *lru_w = NULL, *lru_l = NULL;
+
+ if (current)
+ scan_windows(current, &lru_p, &lru_w, &lru_l);
+ for (p = packed_git; p; p = p->next)
+ scan_windows(p, &lru_p, &lru_w, &lru_l);
+ 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 && lru_p != current) {
+ close(lru_p->pack_fd);
+ lru_p->pack_fd = -1;
+ }
+ }
+ free(lru_w);
+ pack_open_windows--;
+ return 1;
+ }
+ return 0;
+}
+
+void release_pack_memory(size_t need)
{
- p->pack_use_cnt--;
+ size_t cur = pack_mapped;
+ while (need >= (cur - pack_mapped) && unuse_one_window(NULL))
+ ; /* nothing */
}
-int use_packed_git(struct packed_git *p)
+void unuse_pack(struct pack_window **w_cursor)
{
+ struct pack_window *w = *w_cursor;
+ if (w) {
+ w->inuse_cnt--;
+ *w_cursor = NULL;
+ }
+}
+
+static void open_packed_git(struct packed_git *p)
+{
+ struct stat st;
+ struct pack_header hdr;
+ unsigned char sha1[20];
+ unsigned char *idx_sha1;
+ long fd_flag;
+
+ 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;
-
- pack_mapped += p->pack_size;
- while (PACK_MAX_SZ < pack_mapped && unuse_one_packed_git())
- ; /* 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)
- die("packfile %s cannot be mapped.", p->pack_name);
- p->pack_base = map;
+ } else if (p->pack_size != st.st_size)
+ die("packfile %s size changed", p->pack_name);
- /* 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);
+ /* We leave these file descriptors open with sliding mmap;
+ * there is no point keeping them open across exec(), though.
+ */
+ fd_flag = fcntl(p->pack_fd, F_GETFD, 0);
+ if (fd_flag < 0)
+ die("cannot determine file descriptor flags");
+ fd_flag |= FD_CLOEXEC;
+ if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1)
+ die("cannot set FD_CLOEXEC");
+
+ /* 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);
+}
+
+static int in_window(struct pack_window *win, unsigned long offset)
+{
+ /* We must promise at least 20 bytes (one hash) after the
+ * offset is available from this window, otherwise the offset
+ * is not actually in this window and a different window (which
+ * has that one hash excess) must be used. This is to support
+ * the object header and delta base parsing routines below.
+ */
+ off_t win_off = win->offset;
+ return win_off <= offset
+ && (offset + 20) <= (win_off + win->len);
+}
+
+unsigned char* use_pack(struct packed_git *p,
+ struct pack_window **w_cursor,
+ unsigned long offset,
+ unsigned int *left)
+{
+ struct pack_window *win = *w_cursor;
+
+ if (p->pack_fd == -1)
+ open_packed_git(p);
+
+ /* Since packfiles end in a hash of their content and its
+ * pointless to ask for an offset into the middle of that
+ * hash, and the in_window function above wouldn't match
+ * don't allow an offset too close to the end of the file.
+ */
+ if (offset > (p->pack_size - 20))
+ die("offset beyond end of packfile (truncated pack?)");
+
+ if (!win || !in_window(win, offset)) {
+ if (win)
+ win->inuse_cnt--;
+ for (win = p->windows; win; win = win->next) {
+ if (in_window(win, offset))
+ break;
+ }
+ if (!win) {
+ if (!page_size)
+ page_size = getpagesize();
+ win = xcalloc(1, sizeof(*win));
+ win->offset = (offset / page_size) * page_size;
+ win->len = p->pack_size - win->offset;
+ if (win->len > packed_git_window_size)
+ win->len = packed_git_window_size;
+ pack_mapped += win->len;
+ while (packed_git_limit < pack_mapped
+ && unuse_one_window(p))
+ ; /* nothing */
+ win->base = xmmap(NULL, win->len,
+ PROT_READ, MAP_PRIVATE,
+ p->pack_fd, win->offset);
+ if (win->base == MAP_FAILED)
+ die("packfile %s cannot be mapped: %s",
+ p->pack_name,
+ strerror(errno));
+ pack_mmap_calls++;
+ pack_open_windows++;
+ if (pack_mapped > peak_pack_mapped)
+ peak_pack_mapped = pack_mapped;
+ if (pack_open_windows > peak_pack_open_windows)
+ peak_pack_open_windows = pack_open_windows;
+ win->next = p->windows;
+ 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;
+ }
+ offset -= win->offset;
+ 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();
int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type)
{
- char header[100];
unsigned char real_sha1[20];
- SHA_CTX c;
-
- SHA1_Init(&c);
- SHA1_Update(&c, header, 1+sprintf(header, "%s %lu", type, size));
- SHA1_Update(&c, map, size);
- SHA1_Final(real_sha1, &c);
+ hash_sha1_file(map, size, type, real_sha1);
return hashcmp(sha1, real_sha1) ? -1 : 0;
}
*/
sha1_file_open_flag = 0;
}
- map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+ map = xmmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
close(fd);
- if (map == MAP_FAILED)
- return NULL;
*size = st.st_size;
return map;
}
return 0;
}
-static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz)
+unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep)
{
+ unsigned shift;
unsigned char c;
- unsigned int bits;
unsigned long size;
- static const char *typename[8] = {
- NULL, /* OBJ_EXT */
- "commit", "tree", "blob", "tag",
- NULL, NULL, NULL
+ unsigned long used = 0;
+
+ c = buf[used++];
+ *type = (c >> 4) & 7;
+ size = c & 15;
+ shift = 4;
+ while (c & 0x80) {
+ if (len <= used)
+ return 0;
+ if (sizeof(long) * 8 <= shift)
+ return 0;
+ c = buf[used++];
+ size += (c & 0x7f) << shift;
+ shift += 7;
+ }
+ *sizep = size;
+ return used;
+}
+
+static int unpack_sha1_header(z_stream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz)
+{
+ unsigned long size, used;
+ static const char valid_loose_object_type[8] = {
+ 0, /* OBJ_EXT */
+ 1, 1, 1, 1, /* "commit", "tree", "blob", "tag" */
+ 0, /* "delta" and others are invalid in a loose object */
};
- const char *type;
+ enum object_type type;
/* Get the data stream */
memset(stream, 0, sizeof(*stream));
return inflate(stream, 0);
}
- c = *map++;
- mapsize--;
- type = typename[(c >> 4) & 7];
- if (!type)
+ used = unpack_object_header_gently(map, mapsize, &type, &size);
+ if (!used || !valid_loose_object_type[type])
return -1;
-
- bits = 4;
- size = c & 0xf;
- while ((c & 0x80)) {
- if (bits >= 8*sizeof(long))
- return -1;
- c = *map++;
- size += (c & 0x7f) << bits;
- bits += 7;
- mapsize--;
- }
+ map += used;
+ mapsize -= used;
/* Set up the stream for the rest.. */
stream->next_in = map;
inflateInit(stream);
/* And generate the fake traditional header */
- stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu", type, size);
+ stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu",
+ type_names[type], size);
return 0;
}
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 pack_entry *entry,
+static int packed_object_info(struct packed_git *p, unsigned long offset,
char *type, unsigned long *sizep);
-static int packed_delta_info(unsigned char *base_sha1,
- unsigned long delta_size,
- unsigned long left,
+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,
- struct packed_git *p)
+ unsigned long *sizep)
{
- struct pack_entry base_ent;
+ unsigned long base_offset;
- if (left < 20)
- die("truncated pack file");
-
- /* 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));
+ 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
* based on a base with a wrong size. This saves tons of
* inflate() calls.
*/
-
- if (packed_object_info(&base_ent, type, NULL))
+ if (packed_object_info(p, base_offset, type, NULL))
die("cannot get info for delta-pack base");
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));
-
- 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);
+ 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 shift;
- unsigned char *pack, c;
- unsigned long size;
+ unsigned char *base;
+ unsigned int left;
+ unsigned long used;
- if (offset >= p->pack_size)
+ /* 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");
- pack = (unsigned char *) 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;
+ 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 pack_entry *e,
+void packed_object_info_detail(struct packed_git *p,
+ unsigned long offset,
char *type,
unsigned long *size,
unsigned long *store_size,
unsigned int *delta_chain_length,
unsigned char *base_sha1)
{
- struct packed_git *p = e->p;
- unsigned long offset;
- unsigned char *pack;
+ struct pack_window *w_curs = NULL;
+ unsigned long obj_offset, val;
+ unsigned char *next_sha1;
enum object_type kind;
- offset = unpack_object_header(p, e->offset, &kind, size);
- pack = (unsigned char *) p->pack_base + offset;
- if (kind != OBJ_DELTA)
- *delta_chain_length = 0;
- else {
- unsigned int chain_length = 0;
- if (p->pack_size <= offset + 20)
- die("pack file %s records an incomplete delta base",
- p->pack_name);
- hashcpy(base_sha1, pack);
- 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 = (unsigned char *) p->pack_base + offset;
- chain_length++;
- } while (kind == OBJ_DELTA);
- *delta_chain_length = chain_length;
- }
- switch (kind) {
- case OBJ_COMMIT:
- strcpy(type, commit_type);
- break;
- case OBJ_TREE:
- strcpy(type, tree_type);
- break;
- case OBJ_BLOB:
- strcpy(type, blob_type);
- break;
- case OBJ_TAG:
- strcpy(type, tag_type);
- break;
- default:
- die("corrupted pack file %s containing object of kind %d",
- p->pack_name, kind);
+ *delta_chain_length = 0;
+ obj_offset = offset;
+ offset = unpack_object_header(p, &w_curs, offset, &kind, size);
+
+ for (;;) {
+ switch (kind) {
+ default:
+ die("pack %s contains unknown object type %d",
+ p->pack_name, kind);
+ case OBJ_COMMIT:
+ case OBJ_TREE:
+ case OBJ_BLOB:
+ case OBJ_TAG:
+ strcpy(type, type_names[kind]);
+ *store_size = 0; /* notyet */
+ unuse_pack(&w_curs);
+ return;
+ 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;
+ }
+ obj_offset = offset;
+ offset = unpack_object_header(p, &w_curs, offset, &kind, &val);
+ (*delta_chain_length)++;
}
- *store_size = 0; /* notyet */
}
-static int packed_object_info(struct pack_entry *entry,
+static int packed_object_info(struct packed_git *p, unsigned long offset,
char *type, unsigned long *sizep)
{
- struct packed_git *p = entry->p;
- unsigned long offset, size, left;
- unsigned char *pack;
+ struct pack_window *w_curs = NULL;
+ unsigned long size, obj_offset = offset;
enum object_type kind;
- int retval;
-
- if (use_packed_git(p))
- die("cannot map packed file");
+ int r;
- offset = unpack_object_header(p, entry->offset, &kind, &size);
- pack = (unsigned char *) p->pack_base + offset;
- left = p->pack_size - offset;
+ offset = unpack_object_header(p, &w_curs, offset, &kind, &size);
switch (kind) {
- case OBJ_DELTA:
- retval = packed_delta_info(pack, size, left, type, sizep, p);
- unuse_packed_git(p);
- return retval;
+ 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:
- strcpy(type, commit_type);
- break;
case OBJ_TREE:
- strcpy(type, tree_type);
- break;
case OBJ_BLOB:
- strcpy(type, blob_type);
- break;
case OBJ_TAG:
- strcpy(type, tag_type);
+ 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)
*sizep = size;
- unuse_packed_git(p);
return 0;
}
-static void *unpack_compressed_entry(unsigned char *data,
- unsigned long size,
- unsigned long left)
+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 = data;
- stream.avail_in = left;
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);
return buffer;
}
-static void *unpack_delta_entry(unsigned char *base_sha1,
+static void *unpack_delta_entry(struct packed_git *p,
+ struct pack_window **w_curs,
+ unsigned long offset,
unsigned long delta_size,
- unsigned long left,
+ enum object_type kind,
+ unsigned long obj_offset,
char *type,
- unsigned long *sizep,
- struct packed_git *p)
+ unsigned long *sizep)
{
- struct pack_entry base_ent;
void *delta_data, *result, *base;
- unsigned long result_size, base_size;
+ unsigned long result_size, base_size, base_offset;
- if (left < 20)
- die("truncated pack file");
-
- /* 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);
+ 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-pack base object %s",
- sha1_to_hex(base_sha1));
+ die("failed to read delta base object at %lu from %s",
+ base_offset, p->pack_name);
- delta_data = unpack_compressed_entry(base_sha1 + 20,
- delta_size, left - 20);
+ 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(entry, 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 pack_entry *entry,
+void *unpack_entry(struct packed_git *p, unsigned long offset,
char *type, unsigned long *sizep)
{
- struct packed_git *p = entry->p;
- unsigned long offset, size, left;
- unsigned char *pack;
+ struct pack_window *w_curs = NULL;
+ unsigned long size, obj_offset = offset;
enum object_type kind;
void *retval;
- offset = unpack_object_header(p, entry->offset, &kind, &size);
- pack = (unsigned char *) p->pack_base + offset;
- left = p->pack_size - offset;
+ offset = unpack_object_header(p, &w_curs, offset, &kind, &size);
switch (kind) {
- case OBJ_DELTA:
- retval = unpack_delta_entry(pack, size, left, type, sizep, p);
- return retval;
- case OBJ_COMMIT:
- strcpy(type, commit_type);
+ 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:
- strcpy(type, tree_type);
- break;
case OBJ_BLOB:
- strcpy(type, blob_type);
- break;
case OBJ_TAG:
- strcpy(type, tag_type);
+ strcpy(type, type_names[kind]);
+ *sizep = 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);
}
- *sizep = size;
- retval = unpack_compressed_entry(pack, size, left);
+ unuse_pack(&w_curs);
return retval;
}
return 0;
}
-int find_pack_entry_one(const unsigned char *sha1,
- struct pack_entry *e, struct packed_git *p)
+unsigned long find_pack_entry_one(const unsigned char *sha1,
+ struct packed_git *p)
{
unsigned int *level1_ofs = p->index_base;
int hi = ntohl(level1_ofs[*sha1]);
do {
int mi = (lo + hi) / 2;
int cmp = hashcmp((unsigned char *)index + (24 * mi) + 4, sha1);
- if (!cmp) {
- e->offset = ntohl(*((unsigned int *) ((char *) index + (24 * mi))));
- hashcpy(e->sha1, sha1);
- e->p = p;
- return 1;
- }
+ if (!cmp)
+ return ntohl(*((unsigned int *) ((char *) index + (24 * mi))));
if (cmp > 0)
hi = mi;
else
return 0;
}
-static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e)
+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;
+ unsigned long offset;
+
prepare_packed_git();
for (p = packed_git; p; p = p->next) {
- if (find_pack_entry_one(sha1, e, p))
+ if (ignore_packed) {
+ const char **ig;
+ for (ig = ignore_packed; *ig; ig++)
+ if (!matches_pack_name(p, *ig))
+ break;
+ if (*ig)
+ continue;
+ }
+ offset = find_pack_entry_one(sha1, p);
+ if (offset) {
+ e->offset = offset;
+ e->p = p;
+ hashcpy(e->sha1, sha1);
return 1;
+ }
}
return 0;
}
struct packed_git *packs)
{
struct packed_git *p;
- struct pack_entry e;
for (p = packs; p; p = p->next) {
- if (find_pack_entry_one(sha1, &e, p))
+ if (find_pack_entry_one(sha1, p))
return p;
}
return NULL;
}
-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))
- return packed_object_info(&e, type, sizep);
- reprepare_packed_git();
- if (find_pack_entry(sha1, &e))
- return packed_object_info(&e, type, sizep);
+ 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;
- if (!find_pack_entry(sha1, &e)) {
+ if (!find_pack_entry(sha1, &e, NULL)) {
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)
void *map, *buf;
struct pack_entry e;
- if (find_pack_entry(sha1, &e))
+ if (find_pack_entry(sha1, &e, NULL))
return read_packed_sha1(sha1, type, size);
map = map_sha1_file(sha1, &mapsize);
if (map) {
return buf;
}
reprepare_packed_git();
- if (find_pack_entry(sha1, &e))
+ if (find_pack_entry(sha1, &e, NULL))
return read_packed_sha1(sha1, type, size);
return NULL;
}
}
}
-char *write_sha1_file_prepare(void *buf,
- unsigned long len,
- const char *type,
- unsigned char *sha1,
- unsigned char *hdr,
- int *hdrlen)
+static void write_sha1_file_prepare(void *buf, unsigned long len,
+ const char *type, unsigned char *sha1,
+ unsigned char *hdr, int *hdrlen)
{
SHA_CTX c;
SHA1_Update(&c, hdr, *hdrlen);
SHA1_Update(&c, buf, len);
SHA1_Final(sha1, &c);
-
- return sha1_file_name(sha1);
}
/*
*
* Returns the errno on failure, 0 on success.
*/
-static int link_temp_to_file(const char *tmpfile, char *filename)
+static int link_temp_to_file(const char *tmpfile, const char *filename)
{
int ret;
char *dir;
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;
/*
* Move the just written object into its final resting place
*/
-int move_temp_to_file(const char *tmpfile, char *filename)
+int move_temp_to_file(const char *tmpfile, const char *filename)
{
int ret = link_temp_to_file(tmpfile, filename);
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 ? */
}
static int write_buffer(int fd, const void *buf, size_t len)
{
- while (len) {
- ssize_t size;
-
- size = write(fd, buf, len);
- if (!size)
- return error("file write: disk full");
- if (size < 0) {
- if (errno == EINTR || errno == EAGAIN)
- continue;
- return error("file write error (%s)", strerror(errno));
- }
- len -= size;
- buf = (char *) buf + size;
- }
+ if (write_in_full(fd, buf, len) < 0)
+ return error("file write error (%s)", strerror(errno));
return 0;
}
stream->avail_out -= hdr;
}
+int hash_sha1_file(void *buf, unsigned long len, const char *type,
+ unsigned char *sha1)
+{
+ unsigned char hdr[50];
+ int hdrlen;
+ write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
+ return 0;
+}
+
int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1)
{
int size;
/* 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);
+ write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
+ filename = sha1_file_name(sha1);
if (returnsha1)
hashcpy(returnsha1, sha1);
if (has_sha1_file(sha1))
}
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));
if (ret != Z_OK)
break;
}
- size = read(fd, buffer + *bufposn, bufsize - *bufposn);
+ size = xread(fd, buffer + *bufposn, bufsize - *bufposn);
if (size <= 0) {
close(local);
unlink(tmpfile);
return 1;
}
-int has_sha1_pack(const unsigned char *sha1)
+int has_sha1_pack(const unsigned char *sha1, const char **ignore_packed)
{
struct pack_entry e;
- return find_pack_entry(sha1, &e);
+ return find_pack_entry(sha1, &e, ignore_packed);
}
int has_sha1_file(const unsigned char *sha1)
struct stat st;
struct pack_entry e;
- if (find_pack_entry(sha1, &e))
+ if (find_pack_entry(sha1, &e, NULL))
return 1;
return find_sha1_file(sha1, &st) ? 1 : 0;
}
off += iret;
if (off == size) {
size *= 2;
- buf = realloc(buf, size);
+ buf = xrealloc(buf, size);
}
}
} while (iret > 0);
int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object)
{
unsigned long size = 4096;
- char *buf = malloc(size);
+ char *buf = xmalloc(size);
int ret;
- unsigned char hdr[50];
- int hdrlen;
if (read_pipe(fd, &buf, &size)) {
free(buf);
type = blob_type;
if (write_object)
ret = write_sha1_file(buf, size, type, sha1);
- else {
- write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen);
- ret = 0;
- }
+ else
+ ret = hash_sha1_file(buf, size, type, sha1);
free(buf);
return ret;
}
unsigned long size = st->st_size;
void *buf;
int ret;
- unsigned char hdr[50];
- int hdrlen;
buf = "";
if (size)
- buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
+ buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
close(fd);
- if (buf == MAP_FAILED)
- return -1;
if (!type)
type = blob_type;
if (write_object)
ret = write_sha1_file(buf, size, type, sha1);
- else {
- write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen);
- ret = 0;
- }
+ else
+ ret = hash_sha1_file(buf, size, type, sha1);
if (size)
munmap(buf, size);
return ret;
return error("readlink(\"%s\"): %s", path,
errstr);
}
- if (!write_object) {
- unsigned char hdr[50];
- int hdrlen;
- write_sha1_file_prepare(target, st->st_size, blob_type,
- sha1, hdr, &hdrlen);
- } else if (write_sha1_file(target, st->st_size, blob_type, sha1))
+ if (!write_object)
+ hash_sha1_file(target, st->st_size, blob_type, sha1);
+ else if (write_sha1_file(target, st->st_size, blob_type, sha1))
return error("%s: failed to insert into database",
path);
free(target);