return ret;
}
-void close_pack_windows(struct packed_git *p)
-{
- while (p->windows) {
- struct pack_window *w = p->windows;
-
- if (w->inuse_cnt)
- die("pack '%s' still has open windows to it",
- p->pack_name);
- munmap(w->base, w->len);
- pack_mapped -= w->len;
- pack_open_windows--;
- p->windows = w->next;
- free(w);
- }
-}
-
-static int close_pack_fd(struct packed_git *p)
-{
- if (p->pack_fd < 0)
- return 0;
-
- close(p->pack_fd);
- pack_open_fds--;
- p->pack_fd = -1;
-
- return 1;
-}
-
-static void close_pack(struct packed_git *p)
-{
- close_pack_windows(p);
- close_pack_fd(p);
- close_pack_index(p);
-}
-
-void close_all_packs(void)
-{
- struct packed_git *p;
-
- for (p = packed_git; p; p = p->next)
- if (p->do_not_close)
- die("BUG: want to close pack marked 'do-not-close'");
- else
- close_pack(p);
-}
-
-
-/*
- * The LRU pack is the one with the oldest MRU window, preferring packs
- * with no used windows, or the oldest mtime if it has no windows allocated.
- */
-static void find_lru_pack(struct packed_git *p, struct packed_git **lru_p, struct pack_window **mru_w, int *accept_windows_inuse)
-{
- struct pack_window *w, *this_mru_w;
- int has_windows_inuse = 0;
-
- /*
- * Reject this pack if it has windows and the previously selected
- * one does not. If this pack does not have windows, reject
- * it if the pack file is newer than the previously selected one.
- */
- if (*lru_p && !*mru_w && (p->windows || p->mtime > (*lru_p)->mtime))
- return;
-
- for (w = this_mru_w = p->windows; w; w = w->next) {
- /*
- * Reject this pack if any of its windows are in use,
- * but the previously selected pack did not have any
- * inuse windows. Otherwise, record that this pack
- * has windows in use.
- */
- if (w->inuse_cnt) {
- if (*accept_windows_inuse)
- has_windows_inuse = 1;
- else
- return;
- }
-
- if (w->last_used > this_mru_w->last_used)
- this_mru_w = w;
-
- /*
- * Reject this pack if it has windows that have been
- * used more recently than the previously selected pack.
- * If the previously selected pack had windows inuse and
- * we have not encountered a window in this pack that is
- * inuse, skip this check since we prefer a pack with no
- * inuse windows to one that has inuse windows.
- */
- if (*mru_w && *accept_windows_inuse == has_windows_inuse &&
- this_mru_w->last_used > (*mru_w)->last_used)
- return;
- }
-
- /*
- * Select this pack.
- */
- *mru_w = this_mru_w;
- *lru_p = p;
- *accept_windows_inuse = has_windows_inuse;
-}
-
-static int close_one_pack(void)
-{
- struct packed_git *p, *lru_p = NULL;
- struct pack_window *mru_w = NULL;
- int accept_windows_inuse = 1;
-
- for (p = packed_git; p; p = p->next) {
- if (p->pack_fd == -1)
- continue;
- find_lru_pack(p, &lru_p, &mru_w, &accept_windows_inuse);
- }
-
- if (lru_p)
- return close_pack_fd(lru_p);
-
- return 0;
-}
-
-void unuse_pack(struct pack_window **w_cursor)
-{
- struct pack_window *w = *w_cursor;
- if (w) {
- w->inuse_cnt--;
- *w_cursor = NULL;
- }
-}
-
-void close_pack_index(struct packed_git *p)
-{
- if (p->index_data) {
- munmap((void *)p->index_data, p->index_size);
- p->index_data = NULL;
- }
-}
-
-static unsigned int get_max_fd_limit(void)
-{
-#ifdef RLIMIT_NOFILE
- {
- struct rlimit lim;
-
- if (!getrlimit(RLIMIT_NOFILE, &lim))
- return lim.rlim_cur;
- }
-#endif
-
-#ifdef _SC_OPEN_MAX
- {
- long open_max = sysconf(_SC_OPEN_MAX);
- if (0 < open_max)
- return open_max;
- /*
- * Otherwise, we got -1 for one of the two
- * reasons:
- *
- * (1) sysconf() did not understand _SC_OPEN_MAX
- * and signaled an error with -1; or
- * (2) sysconf() said there is no limit.
- *
- * We _could_ clear errno before calling sysconf() to
- * tell these two cases apart and return a huge number
- * in the latter case to let the caller cap it to a
- * value that is not so selfish, but letting the
- * fallback OPEN_MAX codepath take care of these cases
- * is a lot simpler.
- */
- }
-#endif
-
-#ifdef OPEN_MAX
- return OPEN_MAX;
-#else
- return 1; /* see the caller ;-) */
-#endif
-}
-
-/*
- * Do not call this directly as this leaks p->pack_fd on error return;
- * call open_packed_git() instead.
- */
-static int open_packed_git_1(struct packed_git *p)
-{
- struct stat st;
- struct pack_header hdr;
- unsigned char sha1[20];
- unsigned char *idx_sha1;
- long fd_flag;
-
- if (!p->index_data && open_pack_index(p))
- return error("packfile %s index unavailable", p->pack_name);
-
- if (!pack_max_fds) {
- unsigned int max_fds = get_max_fd_limit();
-
- /* Save 3 for stdin/stdout/stderr, 22 for work */
- if (25 < max_fds)
- pack_max_fds = max_fds - 25;
- else
- pack_max_fds = 1;
- }
-
- while (pack_max_fds <= pack_open_fds && close_one_pack())
- ; /* nothing */
-
- p->pack_fd = git_open(p->pack_name);
- if (p->pack_fd < 0 || fstat(p->pack_fd, &st))
- return -1;
- pack_open_fds++;
-
- /* If we created the struct before we had the pack we lack size. */
- if (!p->pack_size) {
- if (!S_ISREG(st.st_mode))
- return error("packfile %s not a regular file", p->pack_name);
- p->pack_size = st.st_size;
- } else if (p->pack_size != st.st_size)
- return error("packfile %s size changed", 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)
- return error("cannot determine file descriptor flags");
- fd_flag |= FD_CLOEXEC;
- if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1)
- return error("cannot set FD_CLOEXEC");
-
- /* Verify we recognize this pack file format. */
- if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr))
- return error("file %s is far too short to be a packfile", p->pack_name);
- if (hdr.hdr_signature != htonl(PACK_SIGNATURE))
- return error("file %s is not a GIT packfile", p->pack_name);
- if (!pack_version_ok(hdr.hdr_version))
- return error("packfile %s is version %"PRIu32" and not"
- " supported (try upgrading GIT to a newer version)",
- p->pack_name, ntohl(hdr.hdr_version));
-
- /* Verify the pack matches its index. */
- if (p->num_objects != ntohl(hdr.hdr_entries))
- return error("packfile %s claims to have %"PRIu32" objects"
- " while index indicates %"PRIu32" objects",
- p->pack_name, ntohl(hdr.hdr_entries),
- p->num_objects);
- if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1)
- return error("end of packfile %s is unavailable", p->pack_name);
- if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1))
- return error("packfile %s signature is unavailable", p->pack_name);
- idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40;
- if (hashcmp(sha1, idx_sha1))
- return error("packfile %s does not match index", p->pack_name);
- return 0;
-}
-
-static int open_packed_git(struct packed_git *p)
-{
- if (!open_packed_git_1(p))
- return 0;
- close_pack_fd(p);
- return -1;
-}
-
-static int in_window(struct pack_window *win, off_t 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,
- off_t offset,
- unsigned long *left)
-{
- struct pack_window *win = *w_cursor;
-
- /* Since packfiles end in a hash of their content and it's
- * 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 (!p->pack_size && p->pack_fd == -1 && open_packed_git(p))
- die("packfile %s cannot be accessed", p->pack_name);
- if (offset > (p->pack_size - 20))
- die("offset beyond end of packfile (truncated pack?)");
- if (offset < 0)
- die(_("offset before end of packfile (broken .idx?)"));
-
- 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) {
- size_t window_align = packed_git_window_size / 2;
- off_t len;
-
- if (p->pack_fd == -1 && open_packed_git(p))
- die("packfile %s cannot be accessed", p->pack_name);
-
- win = xcalloc(1, sizeof(*win));
- win->offset = (offset / window_align) * window_align;
- len = p->pack_size - win->offset;
- if (len > packed_git_window_size)
- len = packed_git_window_size;
- win->len = (size_t)len;
- 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_errno("packfile %s cannot be mapped",
- p->pack_name);
- if (!win->offset && win->len == p->pack_size
- && !p->do_not_close)
- close_pack_fd(p);
- 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;
- }
- }
- if (win != *w_cursor) {
- win->last_used = pack_used_ctr++;
- win->inuse_cnt++;
- *w_cursor = win;
- }
- offset -= win->offset;
- if (left)
- *left = win->len - xsize_t(offset);
- return win->base + offset;
-}
-
-static struct packed_git *alloc_packed_git(int extra)
-{
- struct packed_git *p = xmalloc(st_add(sizeof(*p), extra));
- memset(p, 0, sizeof(*p));
- p->pack_fd = -1;
- return p;
-}
-
-static void try_to_free_pack_memory(size_t size)
-{
- release_pack_memory(size);
-}
-
-struct packed_git *add_packed_git(const char *path, size_t path_len, int local)
-{
- static int have_set_try_to_free_routine;
- struct stat st;
- size_t alloc;
- struct packed_git *p;
-
- if (!have_set_try_to_free_routine) {
- have_set_try_to_free_routine = 1;
- set_try_to_free_routine(try_to_free_pack_memory);
- }
-
- /*
- * Make sure a corresponding .pack file exists and that
- * the index looks sane.
- */
- if (!strip_suffix_mem(path, &path_len, ".idx"))
- return NULL;
-
- /*
- * ".pack" is long enough to hold any suffix we're adding (and
- * the use xsnprintf double-checks that)
- */
- alloc = st_add3(path_len, strlen(".pack"), 1);
- p = alloc_packed_git(alloc);
- memcpy(p->pack_name, path, path_len);
-
- xsnprintf(p->pack_name + path_len, alloc - path_len, ".keep");
- if (!access(p->pack_name, F_OK))
- p->pack_keep = 1;
-
- xsnprintf(p->pack_name + path_len, alloc - path_len, ".pack");
- if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) {
- free(p);
- return NULL;
- }
-
- /* ok, it looks sane as far as we can check without
- * actually mapping the pack file.
- */
- p->pack_size = st.st_size;
- p->pack_local = local;
- p->mtime = st.st_mtime;
- if (path_len < 40 || get_sha1_hex(path + path_len - 40, p->sha1))
- hashclr(p->sha1);
- return p;
-}
-
-void install_packed_git(struct packed_git *pack)
-{
- if (pack->pack_fd != -1)
- pack_open_fds++;
-
- pack->next = packed_git;
- packed_git = pack;
-}
-
-void (*report_garbage)(unsigned seen_bits, const char *path);
-
-static void report_helper(const struct string_list *list,
- int seen_bits, int first, int last)
-{
- if (seen_bits == (PACKDIR_FILE_PACK|PACKDIR_FILE_IDX))
- return;
-
- for (; first < last; first++)
- report_garbage(seen_bits, list->items[first].string);
-}
-
-static void report_pack_garbage(struct string_list *list)
-{
- int i, baselen = -1, first = 0, seen_bits = 0;
-
- if (!report_garbage)
- return;
-
- string_list_sort(list);
-
- for (i = 0; i < list->nr; i++) {
- const char *path = list->items[i].string;
- if (baselen != -1 &&
- strncmp(path, list->items[first].string, baselen)) {
- report_helper(list, seen_bits, first, i);
- baselen = -1;
- seen_bits = 0;
- }
- if (baselen == -1) {
- const char *dot = strrchr(path, '.');
- if (!dot) {
- report_garbage(PACKDIR_FILE_GARBAGE, path);
- continue;
- }
- baselen = dot - path + 1;
- first = i;
- }
- if (!strcmp(path + baselen, "pack"))
- seen_bits |= 1;
- else if (!strcmp(path + baselen, "idx"))
- seen_bits |= 2;
- }
- report_helper(list, seen_bits, first, list->nr);
-}
-
-static void prepare_packed_git_one(char *objdir, int local)
-{
- struct strbuf path = STRBUF_INIT;
- size_t dirnamelen;
- DIR *dir;
- struct dirent *de;
- struct string_list garbage = STRING_LIST_INIT_DUP;
-
- strbuf_addstr(&path, objdir);
- strbuf_addstr(&path, "/pack");
- dir = opendir(path.buf);
- if (!dir) {
- if (errno != ENOENT)
- error_errno("unable to open object pack directory: %s",
- path.buf);
- strbuf_release(&path);
- return;
- }
- strbuf_addch(&path, '/');
- dirnamelen = path.len;
- while ((de = readdir(dir)) != NULL) {
- struct packed_git *p;
- size_t base_len;
-
- if (is_dot_or_dotdot(de->d_name))
- continue;
-
- strbuf_setlen(&path, dirnamelen);
- strbuf_addstr(&path, de->d_name);
-
- base_len = path.len;
- if (strip_suffix_mem(path.buf, &base_len, ".idx")) {
- /* Don't reopen a pack we already have. */
- for (p = packed_git; p; p = p->next) {
- size_t len;
- if (strip_suffix(p->pack_name, ".pack", &len) &&
- len == base_len &&
- !memcmp(p->pack_name, path.buf, len))
- break;
- }
- if (p == NULL &&
- /*
- * See if it really is a valid .idx file with
- * corresponding .pack file that we can map.
- */
- (p = add_packed_git(path.buf, path.len, local)) != NULL)
- install_packed_git(p);
- }
-
- if (!report_garbage)
- continue;
-
- if (ends_with(de->d_name, ".idx") ||
- ends_with(de->d_name, ".pack") ||
- ends_with(de->d_name, ".bitmap") ||
- ends_with(de->d_name, ".keep"))
- string_list_append(&garbage, path.buf);
- else
- report_garbage(PACKDIR_FILE_GARBAGE, path.buf);
- }
- closedir(dir);
- report_pack_garbage(&garbage);
- string_list_clear(&garbage, 0);
- strbuf_release(&path);
-}
-
-static int approximate_object_count_valid;
-
-/*
- * Give a fast, rough count of the number of objects in the repository. This
- * ignores loose objects completely. If you have a lot of them, then either
- * you should repack because your performance will be awful, or they are
- * all unreachable objects about to be pruned, in which case they're not really
- * interesting as a measure of repo size in the first place.
- */
-unsigned long approximate_object_count(void)
-{
- static unsigned long count;
- if (!approximate_object_count_valid) {
- struct packed_git *p;
-
- prepare_packed_git();
- count = 0;
- for (p = packed_git; p; p = p->next) {
- if (open_pack_index(p))
- continue;
- count += p->num_objects;
- }
- }
- return count;
-}
-
-static void *get_next_packed_git(const void *p)
-{
- return ((const struct packed_git *)p)->next;
-}
-
-static void set_next_packed_git(void *p, void *next)
-{
- ((struct packed_git *)p)->next = next;
-}
-
-static int sort_pack(const void *a_, const void *b_)
-{
- const struct packed_git *a = a_;
- const struct packed_git *b = b_;
- int st;
-
- /*
- * Local packs tend to contain objects specific to our
- * variant of the project than remote ones. In addition,
- * remote ones could be on a network mounted filesystem.
- * Favor local ones for these reasons.
- */
- st = a->pack_local - b->pack_local;
- if (st)
- return -st;
-
- /*
- * Younger packs tend to contain more recent objects,
- * and more recent objects tend to get accessed more
- * often.
- */
- if (a->mtime < b->mtime)
- return 1;
- else if (a->mtime == b->mtime)
- return 0;
- return -1;
-}
-
-static void rearrange_packed_git(void)
-{
- packed_git = llist_mergesort(packed_git, get_next_packed_git,
- set_next_packed_git, sort_pack);
-}
-
-static void prepare_packed_git_mru(void)
-{
- struct packed_git *p;
-
- mru_clear(packed_git_mru);
- for (p = packed_git; p; p = p->next)
- mru_append(packed_git_mru, p);
-}
-
-static int prepare_packed_git_run_once = 0;
-void prepare_packed_git(void)
-{
- struct alternate_object_database *alt;
-
- if (prepare_packed_git_run_once)
- return;
- prepare_packed_git_one(get_object_directory(), 1);
- prepare_alt_odb();
- for (alt = alt_odb_list; alt; alt = alt->next)
- prepare_packed_git_one(alt->path, 0);
- rearrange_packed_git();
- prepare_packed_git_mru();
- prepare_packed_git_run_once = 1;
-}
-
-void reprepare_packed_git(void)
-{
- approximate_object_count_valid = 0;
- prepare_packed_git_run_once = 0;
- prepare_packed_git();
-}
-
static void mark_bad_packed_object(struct packed_git *p,
const unsigned char *sha1)
{
return map_sha1_file_1(NULL, sha1, size);
}
-unsigned long unpack_object_header_buffer(const unsigned char *buf,
- unsigned long len, enum object_type *type, unsigned long *sizep)
-{
- unsigned shift;
- unsigned long size, c;
- unsigned long used = 0;
-
- c = buf[used++];
- *type = (c >> 4) & 7;
- size = c & 15;
- shift = 4;
- while (c & 0x80) {
- if (len <= used || bitsizeof(long) <= shift) {
- error("bad object header");
- size = used = 0;
- break;
- }
- c = buf[used++];
- size += (c & 0x7f) << shift;
- shift += 7;
- }
- *sizep = size;
- return used;
-}
-
static int unpack_sha1_short_header(git_zstream *stream,
unsigned char *map, unsigned long mapsize,
void *buffer, unsigned long bufsiz)
return parse_sha1_header_extended(hdr, &oi, 0);
}
-unsigned long get_size_from_delta(struct packed_git *p,
- struct pack_window **w_curs,
- off_t curpos)
-{
- const unsigned char *data;
- unsigned char delta_head[20], *in;
- git_zstream stream;
- int st;
-
- memset(&stream, 0, sizeof(stream));
- stream.next_out = delta_head;
- stream.avail_out = sizeof(delta_head);
-
- git_inflate_init(&stream);
- do {
- in = use_pack(p, w_curs, curpos, &stream.avail_in);
- stream.next_in = in;
- st = git_inflate(&stream, Z_FINISH);
- curpos += stream.next_in - in;
- } while ((st == Z_OK || st == Z_BUF_ERROR) &&
- stream.total_out < sizeof(delta_head));
- git_inflate_end(&stream);
- if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) {
- error("delta data unpack-initial failed");
- return 0;
- }
-
- /* Examine the initial part of the delta to figure out
- * the result size.
- */
- data = delta_head;
-
- /* ignore base size */
- get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
-
- /* Read the result size */
- return get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
-}
-
static off_t get_delta_base(struct packed_git *p,
struct pack_window **w_curs,
off_t *curpos,