* creation etc.
*/
#include "cache.h"
+#include "config.h"
#include "string-list.h"
#include "lockfile.h"
#include "delta.h"
#include "mru.h"
#include "list.h"
#include "mergesort.h"
-
-#ifndef O_NOATIME
-#if defined(__linux__) && (defined(__i386__) || defined(__PPC__))
-#define O_NOATIME 01000000
-#else
-#define O_NOATIME 0
-#endif
-#endif
-
-#define SZ_FMT PRIuMAX
-static inline uintmax_t sz_fmt(size_t s) { return s; }
+#include "quote.h"
+#include "packfile.h"
const unsigned char null_sha1[20];
const struct object_id null_oid;
*slash = '\0';
if (!stat(path, &st)) {
/* path exists */
- if (!S_ISDIR(st.st_mode))
+ if (!S_ISDIR(st.st_mode)) {
+ errno = ENOTDIR;
ret = SCLD_EXISTS;
+ }
} else if (mkdir(path, 0777)) {
if (errno == EEXIST &&
!stat(path, &st) && S_ISDIR(st.st_mode))
enum scld_error safe_create_leading_directories_const(const char *path)
{
+ int save_errno;
/* path points to cache entries, so xstrdup before messing with it */
char *buf = xstrdup(path);
enum scld_error result = safe_create_leading_directories(buf);
+
+ save_errno = errno;
free(buf);
+ errno = save_errno;
return result;
}
-static void fill_sha1_path(char *pathbuf, const unsigned char *sha1)
+int raceproof_create_file(const char *path, create_file_fn fn, void *cb)
+{
+ /*
+ * The number of times we will try to remove empty directories
+ * in the way of path. This is only 1 because if another
+ * process is racily creating directories that conflict with
+ * us, we don't want to fight against them.
+ */
+ int remove_directories_remaining = 1;
+
+ /*
+ * The number of times that we will try to create the
+ * directories containing path. We are willing to attempt this
+ * more than once, because another process could be trying to
+ * clean up empty directories at the same time as we are
+ * trying to create them.
+ */
+ int create_directories_remaining = 3;
+
+ /* A scratch copy of path, filled lazily if we need it: */
+ struct strbuf path_copy = STRBUF_INIT;
+
+ int ret, save_errno;
+
+ /* Sanity check: */
+ assert(*path);
+
+retry_fn:
+ ret = fn(path, cb);
+ save_errno = errno;
+ if (!ret)
+ goto out;
+
+ if (errno == EISDIR && remove_directories_remaining-- > 0) {
+ /*
+ * A directory is in the way. Maybe it is empty; try
+ * to remove it:
+ */
+ if (!path_copy.len)
+ strbuf_addstr(&path_copy, path);
+
+ if (!remove_dir_recursively(&path_copy, REMOVE_DIR_EMPTY_ONLY))
+ goto retry_fn;
+ } else if (errno == ENOENT && create_directories_remaining-- > 0) {
+ /*
+ * Maybe the containing directory didn't exist, or
+ * maybe it was just deleted by a process that is
+ * racing with us to clean up empty directories. Try
+ * to create it:
+ */
+ enum scld_error scld_result;
+
+ if (!path_copy.len)
+ strbuf_addstr(&path_copy, path);
+
+ do {
+ scld_result = safe_create_leading_directories(path_copy.buf);
+ if (scld_result == SCLD_OK)
+ goto retry_fn;
+ } while (scld_result == SCLD_VANISHED && create_directories_remaining-- > 0);
+ }
+
+out:
+ strbuf_release(&path_copy);
+ errno = save_errno;
+ return ret;
+}
+
+static void fill_sha1_path(struct strbuf *buf, const unsigned char *sha1)
{
int i;
for (i = 0; i < 20; i++) {
static char hex[] = "0123456789abcdef";
unsigned int val = sha1[i];
- char *pos = pathbuf + i*2 + (i > 0);
- *pos++ = hex[val >> 4];
- *pos = hex[val & 0xf];
+ strbuf_addch(buf, hex[val >> 4]);
+ strbuf_addch(buf, hex[val & 0xf]);
+ if (!i)
+ strbuf_addch(buf, '/');
}
}
const char *sha1_file_name(const unsigned char *sha1)
{
- static char buf[PATH_MAX];
- const char *objdir;
- int len;
-
- objdir = get_object_directory();
- len = strlen(objdir);
+ static struct strbuf buf = STRBUF_INIT;
- /* '/' + sha1(2) + '/' + sha1(38) + '\0' */
- if (len + 43 > PATH_MAX)
- die("insanely long object directory %s", objdir);
- memcpy(buf, objdir, len);
- buf[len] = '/';
- buf[len+3] = '/';
- buf[len+42] = '\0';
- fill_sha1_path(buf + len + 1, sha1);
- return buf;
-}
+ strbuf_reset(&buf);
+ strbuf_addf(&buf, "%s/", get_object_directory());
-/*
- * Return the name of the pack or index file with the specified sha1
- * in its filename. *base and *name are scratch space that must be
- * provided by the caller. which should be "pack" or "idx".
- */
-static char *sha1_get_pack_name(const unsigned char *sha1,
- struct strbuf *buf,
- const char *which)
-{
- strbuf_reset(buf);
- strbuf_addf(buf, "%s/pack/pack-%s.%s", get_object_directory(),
- sha1_to_hex(sha1), which);
- return buf->buf;
+ fill_sha1_path(&buf, sha1);
+ return buf.buf;
}
-char *sha1_pack_name(const unsigned char *sha1)
+struct strbuf *alt_scratch_buf(struct alternate_object_database *alt)
{
- static struct strbuf buf = STRBUF_INIT;
- return sha1_get_pack_name(sha1, &buf, "pack");
+ strbuf_setlen(&alt->scratch, alt->base_len);
+ return &alt->scratch;
}
-char *sha1_pack_index_name(const unsigned char *sha1)
+static const char *alt_sha1_path(struct alternate_object_database *alt,
+ const unsigned char *sha1)
{
- static struct strbuf buf = STRBUF_INIT;
- return sha1_get_pack_name(sha1, &buf, "idx");
+ struct strbuf *buf = alt_scratch_buf(alt);
+ fill_sha1_path(buf, sha1);
+ return buf->buf;
}
struct alternate_object_database *alt_odb_list;
* thing twice, or object directory itself.
*/
for (alt = alt_odb_list; alt; alt = alt->next) {
- if (path->len == alt->name - alt->base - 1 &&
- !memcmp(path->buf, alt->base, path->len))
+ if (!fspathcmp(path->buf, alt->path))
return 0;
}
if (!fspathcmp(path->buf, normalized_objdir))
int depth, const char *normalized_objdir)
{
struct alternate_object_database *ent;
- size_t entlen;
struct strbuf pathbuf = STRBUF_INIT;
if (!is_absolute_path(entry) && relative_base) {
- strbuf_addstr(&pathbuf, real_path(relative_base));
+ strbuf_realpath(&pathbuf, relative_base, 1);
strbuf_addch(&pathbuf, '/');
}
strbuf_addstr(&pathbuf, entry);
- if (strbuf_normalize_path(&pathbuf) < 0) {
+ if (strbuf_normalize_path(&pathbuf) < 0 && relative_base) {
error("unable to normalize alternate object path: %s",
pathbuf.buf);
strbuf_release(&pathbuf);
return -1;
}
- entlen = st_add(pathbuf.len, 43); /* '/' + 2 hex + '/' + 38 hex + NUL */
- ent = xmalloc(st_add(sizeof(*ent), entlen));
- memcpy(ent->base, pathbuf.buf, pathbuf.len);
-
- ent->name = ent->base + pathbuf.len + 1;
- ent->base[pathbuf.len] = '/';
- ent->base[pathbuf.len + 3] = '/';
- ent->base[entlen-1] = 0;
+ ent = alloc_alt_odb(pathbuf.buf);
/* add the alternate entry */
*alt_odb_tail = ent;
return 0;
}
+static const char *parse_alt_odb_entry(const char *string,
+ int sep,
+ struct strbuf *out)
+{
+ const char *end;
+
+ strbuf_reset(out);
+
+ if (*string == '#') {
+ /* comment; consume up to next separator */
+ end = strchrnul(string, sep);
+ } else if (*string == '"' && !unquote_c_style(out, string, &end)) {
+ /*
+ * quoted path; unquote_c_style has copied the
+ * data for us and set "end". Broken quoting (e.g.,
+ * an entry that doesn't end with a quote) falls
+ * back to the unquoted case below.
+ */
+ } else {
+ /* normal, unquoted path */
+ end = strchrnul(string, sep);
+ strbuf_add(out, string, end - string);
+ }
+
+ if (*end)
+ end++;
+ return end;
+}
+
static void link_alt_odb_entries(const char *alt, int len, int sep,
const char *relative_base, int depth)
{
- struct string_list entries = STRING_LIST_INIT_NODUP;
- char *alt_copy;
- int i;
struct strbuf objdirbuf = STRBUF_INIT;
+ struct strbuf entry = STRBUF_INIT;
if (depth > 5) {
error("%s: ignoring alternate object stores, nesting too deep.",
die("unable to normalize object directory: %s",
objdirbuf.buf);
- alt_copy = xmemdupz(alt, len);
- string_list_split_in_place(&entries, alt_copy, sep, -1);
- for (i = 0; i < entries.nr; i++) {
- const char *entry = entries.items[i].string;
- if (entry[0] == '\0' || entry[0] == '#')
+ while (*alt) {
+ alt = parse_alt_odb_entry(alt, sep, &entry);
+ if (!entry.len)
continue;
- if (!is_absolute_path(entry) && depth) {
- error("%s: ignoring relative alternate object store %s",
- relative_base, entry);
- } else {
- link_alt_odb_entry(entry, relative_base, depth, objdirbuf.buf);
- }
+ link_alt_odb_entry(entry.buf, relative_base, depth, objdirbuf.buf);
}
- string_list_clear(&entries, 0);
- free(alt_copy);
+ strbuf_release(&entry);
strbuf_release(&objdirbuf);
}
int fd;
path = xstrfmt("%s/info/alternates", relative_base);
- fd = git_open_noatime(path);
+ fd = git_open(path);
free(path);
if (fd < 0)
return;
munmap(map, mapsz);
}
+struct alternate_object_database *alloc_alt_odb(const char *dir)
+{
+ struct alternate_object_database *ent;
+
+ FLEX_ALLOC_STR(ent, path, dir);
+ strbuf_init(&ent->scratch, 0);
+ strbuf_addf(&ent->scratch, "%s/", dir);
+ ent->base_len = ent->scratch.len;
+
+ return ent;
+}
+
void add_to_alternates_file(const char *reference)
{
struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
out:
if (seen_error) {
- free(ref_git);
- ref_git = NULL;
+ FREE_AND_NULL(ref_git);
}
return ref_git;
* either does not exist on disk, or has a stale mtime and may be subject to
* pruning).
*/
-static int check_and_freshen_file(const char *fn, int freshen)
+int check_and_freshen_file(const char *fn, int freshen)
{
if (access(fn, F_OK))
return 0;
struct alternate_object_database *alt;
prepare_alt_odb();
for (alt = alt_odb_list; alt; alt = alt->next) {
- fill_sha1_path(alt->name, sha1);
- if (check_and_freshen_file(alt->base, freshen))
+ const char *path = alt_sha1_path(alt, sha1);
+ if (check_and_freshen_file(path, freshen))
return 1;
}
return 0;
return check_and_freshen(sha1, 0);
}
-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 unsigned int pack_open_fds;
-static unsigned int pack_max_fds;
-static size_t peak_pack_mapped;
-static size_t pack_mapped;
-struct packed_git *packed_git;
-
-static struct mru packed_git_mru_storage;
-struct mru *packed_git_mru = &packed_git_mru_storage;
-
-void pack_report(void)
-{
- 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",
- sz_fmt(getpagesize()),
- sz_fmt(packed_git_window_size),
- sz_fmt(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,
- sz_fmt(pack_mapped), sz_fmt(peak_pack_mapped));
-}
-
-/*
- * Open and mmap the index file at path, perform a couple of
- * consistency checks, then record its information to p. Return 0 on
- * success.
- */
-static int check_packed_git_idx(const char *path, struct packed_git *p)
-{
- void *idx_map;
- struct pack_idx_header *hdr;
- size_t idx_size;
- uint32_t version, nr, i, *index;
- int fd = git_open_noatime(path);
- struct stat st;
-
- if (fd < 0)
- return -1;
- if (fstat(fd, &st)) {
- close(fd);
- return -1;
- }
- idx_size = xsize_t(st.st_size);
- if (idx_size < 4 * 256 + 20 + 20) {
- close(fd);
- return error("index file %s is too small", path);
- }
- idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0);
- close(fd);
-
- hdr = idx_map;
- if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) {
- version = ntohl(hdr->idx_version);
- if (version < 2 || version > 2) {
- munmap(idx_map, idx_size);
- return error("index file %s is version %"PRIu32
- " and is not supported by this binary"
- " (try upgrading GIT to a newer version)",
- path, version);
- }
- } else
- version = 1;
-
- nr = 0;
- index = idx_map;
- if (version > 1)
- index += 2; /* skip index header */
- for (i = 0; i < 256; i++) {
- uint32_t n = ntohl(index[i]);
- if (n < nr) {
- munmap(idx_map, idx_size);
- return error("non-monotonic index %s", path);
- }
- nr = n;
- }
-
- if (version == 1) {
- /*
- * Total size:
- * - 256 index entries 4 bytes each
- * - 24-byte entries * nr (20-byte sha1 + 4-byte offset)
- * - 20-byte SHA1 of the packfile
- * - 20-byte SHA1 file checksum
- */
- if (idx_size != 4*256 + nr * 24 + 20 + 20) {
- munmap(idx_map, idx_size);
- return error("wrong index v1 file size in %s", path);
- }
- } else if (version == 2) {
- /*
- * Minimum size:
- * - 8 bytes of header
- * - 256 index entries 4 bytes each
- * - 20-byte sha1 entry * nr
- * - 4-byte crc entry * nr
- * - 4-byte offset entry * nr
- * - 20-byte SHA1 of the packfile
- * - 20-byte SHA1 file checksum
- * And after the 4-byte offset table might be a
- * variable sized table containing 8-byte entries
- * for offsets larger than 2^31.
- */
- unsigned long min_size = 8 + 4*256 + nr*(20 + 4 + 4) + 20 + 20;
- unsigned long max_size = min_size;
- if (nr)
- max_size += (nr - 1)*8;
- if (idx_size < min_size || idx_size > max_size) {
- munmap(idx_map, idx_size);
- return error("wrong index v2 file size in %s", path);
- }
- if (idx_size != min_size &&
- /*
- * make sure we can deal with large pack offsets.
- * 31-bit signed offset won't be enough, neither
- * 32-bit unsigned one will be.
- */
- (sizeof(off_t) <= 4)) {
- munmap(idx_map, idx_size);
- return error("pack too large for current definition of off_t in %s", path);
- }
- }
-
- p->index_version = version;
- p->index_data = idx_map;
- p->index_size = idx_size;
- p->num_objects = nr;
- return 0;
-}
-
-int open_pack_index(struct packed_git *p)
-{
- char *idx_name;
- size_t len;
- int ret;
-
- if (p->index_data)
- return 0;
-
- if (!strip_suffix(p->pack_name, ".pack", &len))
- die("BUG: pack_name does not end in .pack");
- idx_name = xstrfmt("%.*s.idx", (int)len, p->pack_name);
- ret = check_packed_git_idx(idx_name, p);
- free(idx_name);
- return ret;
-}
-
-static void scan_windows(struct packed_git *p,
- struct packed_git **lru_p,
- struct pack_window **lru_w,
- struct pack_window **lru_l)
-{
- struct pack_window *w, *w_l;
-
- 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;
- }
-}
-
-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;
- free(lru_w);
- pack_open_windows--;
- return 1;
- }
- return 0;
-}
-
-void release_pack_memory(size_t need)
-{
- size_t cur = pack_mapped;
- while (need >= (cur - pack_mapped) && unuse_one_window(NULL))
- ; /* nothing */
-}
-
static void mmap_limit_check(size_t length)
{
static size_t limit = 0;
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)
+static void mark_bad_packed_object(struct packed_git *p,
+ const unsigned char *sha1)
{
- close_pack_windows(p);
- close_pack_fd(p);
- close_pack_index(p);
+ unsigned i;
+ for (i = 0; i < p->num_bad_objects; i++)
+ if (!hashcmp(sha1, p->bad_object_sha1 + GIT_SHA1_RAWSZ * i))
+ return;
+ p->bad_object_sha1 = xrealloc(p->bad_object_sha1,
+ st_mult(GIT_MAX_RAWSZ,
+ st_add(p->num_bad_objects, 1)));
+ hashcpy(p->bad_object_sha1 + GIT_SHA1_RAWSZ * p->num_bad_objects, sha1);
+ p->num_bad_objects++;
}
-void close_all_packs(void)
+static const struct packed_git *has_packed_and_bad(const unsigned char *sha1)
{
struct packed_git *p;
+ unsigned i;
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);
+ for (i = 0; i < p->num_bad_objects; i++)
+ if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i))
+ return p;
+ return NULL;
}
-
/*
- * 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.
+ * With an in-core object data in "map", rehash it to make sure the
+ * object name actually matches "sha1" to detect object corruption.
+ * With "map" == NULL, try reading the object named with "sha1" using
+ * the streaming interface and rehash it to do the same.
*/
-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)
+int check_sha1_signature(const unsigned char *sha1, void *map,
+ unsigned long size, const char *type)
{
- struct packed_git *p, *lru_p = NULL;
- struct pack_window *mru_w = NULL;
- int accept_windows_inuse = 1;
+ unsigned char real_sha1[20];
+ enum object_type obj_type;
+ struct git_istream *st;
+ git_SHA_CTX c;
+ char hdr[32];
+ int hdrlen;
- 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 (map) {
+ hash_sha1_file(map, size, type, real_sha1);
+ return hashcmp(sha1, real_sha1) ? -1 : 0;
}
- if (lru_p)
- return close_pack_fd(lru_p);
+ st = open_istream(sha1, &obj_type, &size, NULL);
+ if (!st)
+ return -1;
- return 0;
-}
+ /* Generate the header */
+ hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(obj_type), size) + 1;
-void unuse_pack(struct pack_window **w_cursor)
-{
- struct pack_window *w = *w_cursor;
- if (w) {
- w->inuse_cnt--;
- *w_cursor = NULL;
- }
-}
+ /* Sha1.. */
+ git_SHA1_Init(&c);
+ git_SHA1_Update(&c, hdr, hdrlen);
+ for (;;) {
+ char buf[1024 * 16];
+ ssize_t readlen = read_istream(st, buf, sizeof(buf));
-void close_pack_index(struct packed_git *p)
-{
- if (p->index_data) {
- munmap((void *)p->index_data, p->index_size);
- p->index_data = NULL;
+ if (readlen < 0) {
+ close_istream(st);
+ return -1;
+ }
+ if (!readlen)
+ break;
+ git_SHA1_Update(&c, buf, readlen);
}
+ git_SHA1_Final(real_sha1, &c);
+ close_istream(st);
+ return hashcmp(sha1, real_sha1) ? -1 : 0;
}
-static unsigned int get_max_fd_limit(void)
+int git_open_cloexec(const char *name, int flags)
{
-#ifdef RLIMIT_NOFILE
- {
- struct rlimit lim;
+ int fd;
+ static int o_cloexec = O_CLOEXEC;
- if (!getrlimit(RLIMIT_NOFILE, &lim))
- return lim.rlim_cur;
+ fd = open(name, flags | o_cloexec);
+ if ((o_cloexec & O_CLOEXEC) && fd < 0 && errno == EINVAL) {
+ /* Try again w/o O_CLOEXEC: the kernel might not support it */
+ o_cloexec &= ~O_CLOEXEC;
+ fd = open(name, flags | o_cloexec);
}
-#endif
-#ifdef _SC_OPEN_MAX
+#if defined(F_GETFD) && defined(F_SETFD) && defined(FD_CLOEXEC)
{
- 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
+ static int fd_cloexec = FD_CLOEXEC;
-#ifdef OPEN_MAX
- return OPEN_MAX;
-#else
- return 1; /* see the caller ;-) */
+ if (!o_cloexec && 0 <= fd && fd_cloexec) {
+ /* Opened w/o O_CLOEXEC? try with fcntl(2) to add it */
+ int flags = fcntl(fd, F_GETFD);
+ if (fcntl(fd, F_SETFD, flags | fd_cloexec))
+ fd_cloexec = 0;
+ }
+ }
#endif
+ return fd;
}
/*
- * Do not call this directly as this leaks p->pack_fd on error return;
- * call open_packed_git() instead.
+ * Find "sha1" as a loose object in the local repository or in an alternate.
+ * Returns 0 on success, negative on failure.
+ *
+ * The "path" out-parameter will give the path of the object we found (if any).
+ * Note that it may point to static storage and is only valid until another
+ * call to sha1_file_name(), etc.
*/
-static int open_packed_git_1(struct packed_git *p)
+static int stat_sha1_file(const unsigned char *sha1, struct stat *st,
+ const char **path)
{
- 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);
+ struct alternate_object_database *alt;
- if (!pack_max_fds) {
- unsigned int max_fds = get_max_fd_limit();
+ *path = sha1_file_name(sha1);
+ if (!lstat(*path, st))
+ return 0;
- /* Save 3 for stdin/stdout/stderr, 22 for work */
- if (25 < max_fds)
- pack_max_fds = max_fds - 25;
- else
- pack_max_fds = 1;
+ prepare_alt_odb();
+ errno = ENOENT;
+ for (alt = alt_odb_list; alt; alt = alt->next) {
+ *path = alt_sha1_path(alt, sha1);
+ if (!lstat(*path, st))
+ return 0;
}
- while (pack_max_fds <= pack_open_fds && close_one_pack())
- ; /* nothing */
-
- p->pack_fd = git_open_noatime(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;
-}
-
-struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path)
-{
- const char *path = sha1_pack_name(sha1);
- size_t alloc = st_add(strlen(path), 1);
- struct packed_git *p = alloc_packed_git(alloc);
-
- memcpy(p->pack_name, path, alloc); /* includes NUL */
- hashcpy(p->sha1, sha1);
- if (check_packed_git_idx(idx_path, p)) {
- free(p);
- return NULL;
- }
-
- 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 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) {
- alt->name[-1] = 0;
- prepare_packed_git_one(alt->base, 0);
- alt->name[-1] = '/';
- }
- rearrange_packed_git();
- prepare_packed_git_mru();
- prepare_packed_git_run_once = 1;
-}
-
-void reprepare_packed_git(void)
-{
- prepare_packed_git_run_once = 0;
- prepare_packed_git();
-}
-
-static void mark_bad_packed_object(struct packed_git *p,
- const unsigned char *sha1)
-{
- unsigned i;
- for (i = 0; i < p->num_bad_objects; i++)
- if (!hashcmp(sha1, p->bad_object_sha1 + GIT_SHA1_RAWSZ * i))
- return;
- p->bad_object_sha1 = xrealloc(p->bad_object_sha1,
- st_mult(GIT_SHA1_RAWSZ,
- st_add(p->num_bad_objects, 1)));
- hashcpy(p->bad_object_sha1 + GIT_SHA1_RAWSZ * p->num_bad_objects, sha1);
- p->num_bad_objects++;
-}
-
-static const struct packed_git *has_packed_and_bad(const unsigned char *sha1)
-{
- struct packed_git *p;
- unsigned i;
-
- for (p = packed_git; p; p = p->next)
- for (i = 0; i < p->num_bad_objects; i++)
- if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i))
- return p;
- return NULL;
-}
-
-/*
- * With an in-core object data in "map", rehash it to make sure the
- * object name actually matches "sha1" to detect object corruption.
- * With "map" == NULL, try reading the object named with "sha1" using
- * the streaming interface and rehash it to do the same.
- */
-int check_sha1_signature(const unsigned char *sha1, void *map,
- unsigned long size, const char *type)
-{
- unsigned char real_sha1[20];
- enum object_type obj_type;
- struct git_istream *st;
- git_SHA_CTX c;
- char hdr[32];
- int hdrlen;
-
- if (map) {
- hash_sha1_file(map, size, type, real_sha1);
- return hashcmp(sha1, real_sha1) ? -1 : 0;
- }
-
- st = open_istream(sha1, &obj_type, &size, NULL);
- if (!st)
- return -1;
-
- /* Generate the header */
- hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(obj_type), size) + 1;
-
- /* Sha1.. */
- git_SHA1_Init(&c);
- git_SHA1_Update(&c, hdr, hdrlen);
- for (;;) {
- char buf[1024 * 16];
- ssize_t readlen = read_istream(st, buf, sizeof(buf));
-
- if (readlen < 0) {
- close_istream(st);
- return -1;
- }
- if (!readlen)
- break;
- git_SHA1_Update(&c, buf, readlen);
- }
- git_SHA1_Final(real_sha1, &c);
- close_istream(st);
- return hashcmp(sha1, real_sha1) ? -1 : 0;
-}
-
-int git_open_noatime(const char *name)
-{
- static int sha1_file_open_flag = O_NOATIME;
-
- for (;;) {
- int fd;
-
- errno = 0;
- fd = open(name, O_RDONLY | sha1_file_open_flag);
- if (fd >= 0)
- return fd;
-
- /* Might the failure be due to O_NOATIME? */
- if (errno != ENOENT && sha1_file_open_flag) {
- sha1_file_open_flag = 0;
- continue;
- }
-
- return -1;
- }
-}
-
-static int stat_sha1_file(const unsigned char *sha1, struct stat *st)
-{
- struct alternate_object_database *alt;
-
- if (!lstat(sha1_file_name(sha1), st))
- return 0;
-
- prepare_alt_odb();
- errno = ENOENT;
- for (alt = alt_odb_list; alt; alt = alt->next) {
- fill_sha1_path(alt->name, sha1);
- if (!lstat(alt->base, st))
- return 0;
- }
-
- return -1;
-}
-
-static int open_sha1_file(const unsigned char *sha1)
+/*
+ * Like stat_sha1_file(), but actually open the object and return the
+ * descriptor. See the caveats on the "path" parameter above.
+ */
+static int open_sha1_file(const unsigned char *sha1, const char **path)
{
int fd;
struct alternate_object_database *alt;
int most_interesting_errno;
- fd = git_open_noatime(sha1_file_name(sha1));
+ *path = sha1_file_name(sha1);
+ fd = git_open(*path);
if (fd >= 0)
return fd;
most_interesting_errno = errno;
prepare_alt_odb();
for (alt = alt_odb_list; alt; alt = alt->next) {
- fill_sha1_path(alt->name, sha1);
- fd = git_open_noatime(alt->base);
+ *path = alt_sha1_path(alt, sha1);
+ fd = git_open(*path);
if (fd >= 0)
return fd;
if (most_interesting_errno == ENOENT)
return -1;
}
-void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
+/*
+ * Map the loose object at "path" if it is not NULL, or the path found by
+ * searching for a loose object named "sha1".
+ */
+static void *map_sha1_file_1(const char *path,
+ const unsigned char *sha1,
+ unsigned long *size)
{
void *map;
int fd;
- fd = open_sha1_file(sha1);
+ if (path)
+ fd = git_open(path);
+ else
+ fd = open_sha1_file(sha1, &path);
map = NULL;
if (fd >= 0) {
struct stat st;
*size = xsize_t(st.st_size);
if (!*size) {
/* mmap() is forbidden on empty files */
- error("object file %s is empty", sha1_file_name(sha1));
+ error("object file %s is empty", path);
return NULL;
}
map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0);
return map;
}
-unsigned long unpack_object_header_buffer(const unsigned char *buf,
- unsigned long len, enum object_type *type, unsigned long *sizep)
+void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
{
- 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;
+ return map_sha1_file_1(NULL, sha1, size);
}
static int unpack_sha1_short_header(git_zstream *stream,
* we're obtaining the type using '--allow-unknown-type'
* option.
*/
- if ((flags & LOOKUP_UNKNOWN_OBJECT) && (type < 0))
+ if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE) && (type < 0))
type = 0;
else if (type < 0)
die("invalid object type");
int parse_sha1_header(const char *hdr, unsigned long *sizep)
{
- struct object_info oi;
+ struct object_info oi = OBJECT_INFO_INIT;
oi.sizep = sizep;
- oi.typename = NULL;
- oi.typep = NULL;
- return parse_sha1_header_extended(hdr, &oi, LOOKUP_REPLACE_OBJECT);
-}
-
-static void *unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size, const unsigned char *sha1)
-{
- int ret;
- git_zstream stream;
- char hdr[8192];
-
- ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr));
- if (ret < Z_OK || (*type = parse_sha1_header(hdr, size)) < 0)
- return NULL;
-
- return unpack_sha1_rest(&stream, hdr, *size, sha1);
-}
-
-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));
+ return parse_sha1_header_extended(hdr, &oi, 0);
}
static off_t get_delta_base(struct packed_git *p,
case OBJ_BLOB:
case OBJ_TAG:
break;
- default:
- error("unknown object type %i at offset %"PRIuMAX" in %s",
- type, (uintmax_t)obj_offset, p->pack_name);
- type = OBJ_BAD;
- }
-
-out:
- if (poi_stack != small_poi_stack)
- free(poi_stack);
- return type;
-
-unwind:
- while (poi_stack_nr) {
- obj_offset = poi_stack[--poi_stack_nr];
- type = retry_bad_packed_offset(p, obj_offset);
- if (type > OBJ_NONE)
- goto out;
- }
- type = OBJ_BAD;
- goto out;
-}
-
-static int packed_object_info(struct packed_git *p, off_t obj_offset,
- struct object_info *oi)
-{
- struct pack_window *w_curs = NULL;
- unsigned long size;
- off_t curpos = obj_offset;
- enum object_type type;
-
- /*
- * We always get the representation type, but only convert it to
- * a "real" type later if the caller is interested.
- */
- type = unpack_object_header(p, &w_curs, &curpos, &size);
-
- if (oi->sizep) {
- if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) {
- off_t tmp_pos = curpos;
- off_t base_offset = get_delta_base(p, &w_curs, &tmp_pos,
- type, obj_offset);
- if (!base_offset) {
- type = OBJ_BAD;
- goto out;
- }
- *oi->sizep = get_size_from_delta(p, &w_curs, tmp_pos);
- if (*oi->sizep == 0) {
- type = OBJ_BAD;
- goto out;
- }
- } else {
- *oi->sizep = size;
- }
- }
-
- if (oi->disk_sizep) {
- struct revindex_entry *revidx = find_pack_revindex(p, obj_offset);
- *oi->disk_sizep = revidx[1].offset - obj_offset;
- }
-
- if (oi->typep) {
- *oi->typep = packed_to_object_type(p, obj_offset, type, &w_curs, curpos);
- if (*oi->typep < 0) {
- type = OBJ_BAD;
- goto out;
- }
- }
-
- if (oi->delta_base_sha1) {
- if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) {
- const unsigned char *base;
-
- base = get_delta_base_sha1(p, &w_curs, curpos,
- type, obj_offset);
- if (!base) {
- type = OBJ_BAD;
- goto out;
- }
-
- hashcpy(oi->delta_base_sha1, base);
- } else
- hashclr(oi->delta_base_sha1);
- }
-
-out:
- unuse_pack(&w_curs);
- return type;
-}
-
-static void *unpack_compressed_entry(struct packed_git *p,
- struct pack_window **w_curs,
- off_t curpos,
- unsigned long size)
-{
- int st;
- git_zstream stream;
- unsigned char *buffer, *in;
-
- buffer = xmallocz_gently(size);
- if (!buffer)
- return NULL;
- memset(&stream, 0, sizeof(stream));
- stream.next_out = buffer;
- stream.avail_out = size + 1;
-
- 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);
- if (!stream.avail_out)
- break; /* the payload is larger than it should be */
- curpos += stream.next_in - in;
- } while (st == Z_OK || st == Z_BUF_ERROR);
- git_inflate_end(&stream);
- if ((st != Z_STREAM_END) || stream.total_out != size) {
- free(buffer);
- return NULL;
+ default:
+ error("unknown object type %i at offset %"PRIuMAX" in %s",
+ type, (uintmax_t)obj_offset, p->pack_name);
+ type = OBJ_BAD;
}
- return buffer;
+out:
+ if (poi_stack != small_poi_stack)
+ free(poi_stack);
+ return type;
+
+unwind:
+ while (poi_stack_nr) {
+ obj_offset = poi_stack[--poi_stack_nr];
+ type = retry_bad_packed_offset(p, obj_offset);
+ if (type > OBJ_NONE)
+ goto out;
+ }
+ type = OBJ_BAD;
+ goto out;
}
static struct hashmap delta_base_cache;
return a->p == b->p && a->base_offset == b->base_offset;
}
-static int delta_base_cache_hash_cmp(const void *va, const void *vb,
+static int delta_base_cache_hash_cmp(const void *unused_cmp_data,
+ const void *va, const void *vb,
const void *vkey)
{
const struct delta_base_cache_entry *a = va, *b = vb;
if (!ent)
return unpack_entry(p, base_offset, type, base_size);
- *type = ent->type;
- *base_size = ent->size;
+ if (type)
+ *type = ent->type;
+ if (base_size)
+ *base_size = ent->size;
return xmemdupz(ent->data, ent->size);
}
void clear_delta_base_cache(void)
{
- struct hashmap_iter iter;
- struct delta_base_cache_entry *entry;
- for (entry = hashmap_iter_first(&delta_base_cache, &iter);
- entry;
- entry = hashmap_iter_next(&iter)) {
+ struct list_head *lru, *tmp;
+ list_for_each_safe(lru, tmp, &delta_base_cache_lru) {
+ struct delta_base_cache_entry *entry =
+ list_entry(lru, struct delta_base_cache_entry, lru);
release_delta_base_cache(entry);
}
}
list_add_tail(&ent->lru, &delta_base_cache_lru);
if (!delta_base_cache.cmpfn)
- hashmap_init(&delta_base_cache, delta_base_cache_hash_cmp, 0);
+ hashmap_init(&delta_base_cache, delta_base_cache_hash_cmp, NULL, 0);
hashmap_entry_init(ent, pack_entry_hash(p, base_offset));
hashmap_add(&delta_base_cache, ent);
}
+int packed_object_info(struct packed_git *p, off_t obj_offset,
+ struct object_info *oi)
+{
+ struct pack_window *w_curs = NULL;
+ unsigned long size;
+ off_t curpos = obj_offset;
+ enum object_type type;
+
+ /*
+ * We always get the representation type, but only convert it to
+ * a "real" type later if the caller is interested.
+ */
+ if (oi->contentp) {
+ *oi->contentp = cache_or_unpack_entry(p, obj_offset, oi->sizep,
+ &type);
+ if (!*oi->contentp)
+ type = OBJ_BAD;
+ } else {
+ type = unpack_object_header(p, &w_curs, &curpos, &size);
+ }
+
+ if (!oi->contentp && oi->sizep) {
+ if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) {
+ off_t tmp_pos = curpos;
+ off_t base_offset = get_delta_base(p, &w_curs, &tmp_pos,
+ type, obj_offset);
+ if (!base_offset) {
+ type = OBJ_BAD;
+ goto out;
+ }
+ *oi->sizep = get_size_from_delta(p, &w_curs, tmp_pos);
+ if (*oi->sizep == 0) {
+ type = OBJ_BAD;
+ goto out;
+ }
+ } else {
+ *oi->sizep = size;
+ }
+ }
+
+ if (oi->disk_sizep) {
+ struct revindex_entry *revidx = find_pack_revindex(p, obj_offset);
+ *oi->disk_sizep = revidx[1].offset - obj_offset;
+ }
+
+ if (oi->typep || oi->typename) {
+ enum object_type ptot;
+ ptot = packed_to_object_type(p, obj_offset, type, &w_curs,
+ curpos);
+ if (oi->typep)
+ *oi->typep = ptot;
+ if (oi->typename) {
+ const char *tn = typename(ptot);
+ if (tn)
+ strbuf_addstr(oi->typename, tn);
+ }
+ if (ptot < 0) {
+ type = OBJ_BAD;
+ goto out;
+ }
+ }
+
+ if (oi->delta_base_sha1) {
+ if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) {
+ const unsigned char *base;
+
+ base = get_delta_base_sha1(p, &w_curs, curpos,
+ type, obj_offset);
+ if (!base) {
+ type = OBJ_BAD;
+ goto out;
+ }
+
+ hashcpy(oi->delta_base_sha1, base);
+ } else
+ hashclr(oi->delta_base_sha1);
+ }
+
+ oi->whence = in_delta_base_cache(p, obj_offset) ? OI_DBCACHED :
+ OI_PACKED;
+
+out:
+ unuse_pack(&w_curs);
+ return type;
+}
+
+static void *unpack_compressed_entry(struct packed_git *p,
+ struct pack_window **w_curs,
+ off_t curpos,
+ unsigned long size)
+{
+ int st;
+ git_zstream stream;
+ unsigned char *buffer, *in;
+
+ buffer = xmallocz_gently(size);
+ if (!buffer)
+ return NULL;
+ memset(&stream, 0, sizeof(stream));
+ stream.next_out = buffer;
+ stream.avail_out = size + 1;
+
+ 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);
+ if (!stream.avail_out)
+ break; /* the payload is larger than it should be */
+ curpos += stream.next_in - in;
+ } while (st == Z_OK || st == Z_BUF_ERROR);
+ git_inflate_end(&stream);
+ if ((st != Z_STREAM_END) || stream.total_out != size) {
+ free(buffer);
+ return NULL;
+ }
+
+ return buffer;
+}
+
static void *read_object(const unsigned char *sha1, enum object_type *type,
unsigned long *size);
error("bad packed object CRC for %s",
sha1_to_hex(sha1));
mark_bad_packed_object(p, sha1);
- unuse_pack(&w_curs);
- return NULL;
+ data = NULL;
+ goto out;
}
}
while (delta_stack_nr) {
void *delta_data;
void *base = data;
+ void *external_base = NULL;
unsigned long delta_size, base_size = size;
int i;
p->pack_name);
mark_bad_packed_object(p, base_sha1);
base = read_object(base_sha1, &type, &base_size);
+ external_base = base;
}
}
"at offset %"PRIuMAX" from %s",
(uintmax_t)curpos, p->pack_name);
data = NULL;
+ free(external_base);
continue;
}
error("failed to apply delta");
free(delta_data);
+ free(external_base);
}
- *final_type = type;
- *final_size = size;
+ if (final_type)
+ *final_type = type;
+ if (final_size)
+ *final_size = size;
+out:
unuse_pack(&w_curs);
if (delta_stack != small_delta_stack)
}
}
+const struct object_id *nth_packed_object_oid(struct object_id *oid,
+ struct packed_git *p,
+ uint32_t n)
+{
+ const unsigned char *hash = nth_packed_object_sha1(p, n);
+ if (!hash)
+ return NULL;
+ hashcpy(oid->hash, hash);
+ return oid;
+}
+
void check_pack_index_ptr(const struct packed_git *p, const void *vptr)
{
const unsigned char *ptr = vptr;
const uint32_t *level1_ofs = p->index_data;
const unsigned char *index = p->index_data;
unsigned hi, lo, stride;
- static int use_lookup = -1;
static int debug_lookup = -1;
if (debug_lookup < 0)
printf("%02x%02x%02x... lo %u hi %u nr %"PRIu32"\n",
sha1[0], sha1[1], sha1[2], lo, hi, p->num_objects);
- if (use_lookup < 0)
- use_lookup = !!getenv("GIT_USE_LOOKUP");
- if (use_lookup) {
- int pos = sha1_entry_pos(index, stride, 0,
- lo, hi, p->num_objects, sha1);
- if (pos < 0)
- return 0;
- return nth_packed_object_offset(p, pos);
- }
-
- do {
+ while (lo < hi) {
unsigned mi = (lo + hi) / 2;
int cmp = hashcmp(index + mi * stride, sha1);
hi = mi;
else
lo = mi+1;
- } while (lo < hi);
+ }
return 0;
}
git_zstream stream;
char hdr[32];
struct strbuf hdrbuf = STRBUF_INIT;
+ unsigned long size_scratch;
if (oi->delta_base_sha1)
hashclr(oi->delta_base_sha1);
* return value implicitly indicates whether the
* object even exists.
*/
- if (!oi->typep && !oi->typename && !oi->sizep) {
+ if (!oi->typep && !oi->typename && !oi->sizep && !oi->contentp) {
+ const char *path;
struct stat st;
- if (stat_sha1_file(sha1, &st) < 0)
+ if (stat_sha1_file(sha1, &st, &path) < 0)
return -1;
if (oi->disk_sizep)
*oi->disk_sizep = st.st_size;
map = map_sha1_file(sha1, &mapsize);
if (!map)
return -1;
+
+ if (!oi->sizep)
+ oi->sizep = &size_scratch;
+
if (oi->disk_sizep)
*oi->disk_sizep = mapsize;
- if ((flags & LOOKUP_UNKNOWN_OBJECT)) {
+ if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE)) {
if (unpack_sha1_header_to_strbuf(&stream, map, mapsize, hdr, sizeof(hdr), &hdrbuf) < 0)
status = error("unable to unpack %s header with --allow-unknown-type",
sha1_to_hex(sha1));
sha1_to_hex(sha1));
} else if ((status = parse_sha1_header_extended(hdr, oi, flags)) < 0)
status = error("unable to parse %s header", sha1_to_hex(sha1));
- git_inflate_end(&stream);
+
+ if (status >= 0 && oi->contentp)
+ *oi->contentp = unpack_sha1_rest(&stream, hdr,
+ *oi->sizep, sha1);
+ else
+ git_inflate_end(&stream);
+
munmap(map, mapsize);
if (status && oi->typep)
*oi->typep = status;
+ if (oi->sizep == &size_scratch)
+ oi->sizep = NULL;
strbuf_release(&hdrbuf);
- return 0;
+ oi->whence = OI_LOOSE;
+ return (status < 0) ? status : 0;
}
int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi, unsigned flags)
{
- struct cached_object *co;
+ static struct object_info blank_oi = OBJECT_INFO_INIT;
struct pack_entry e;
int rtype;
- enum object_type real_type;
- const unsigned char *real = lookup_replace_object_extended(sha1, flags);
-
- co = find_cached_object(real);
- if (co) {
- if (oi->typep)
- *(oi->typep) = co->type;
- if (oi->sizep)
- *(oi->sizep) = co->size;
- if (oi->disk_sizep)
- *(oi->disk_sizep) = 0;
- if (oi->delta_base_sha1)
- hashclr(oi->delta_base_sha1);
- if (oi->typename)
- strbuf_addstr(oi->typename, typename(co->type));
- oi->whence = OI_CACHED;
- return 0;
+ const unsigned char *real = (flags & OBJECT_INFO_LOOKUP_REPLACE) ?
+ lookup_replace_object(sha1) :
+ sha1;
+
+ if (!oi)
+ oi = &blank_oi;
+
+ if (!(flags & OBJECT_INFO_SKIP_CACHED)) {
+ struct cached_object *co = find_cached_object(real);
+ if (co) {
+ if (oi->typep)
+ *(oi->typep) = co->type;
+ if (oi->sizep)
+ *(oi->sizep) = co->size;
+ if (oi->disk_sizep)
+ *(oi->disk_sizep) = 0;
+ if (oi->delta_base_sha1)
+ hashclr(oi->delta_base_sha1);
+ if (oi->typename)
+ strbuf_addstr(oi->typename, typename(co->type));
+ if (oi->contentp)
+ *oi->contentp = xmemdupz(co->buf, co->size);
+ oi->whence = OI_CACHED;
+ return 0;
+ }
}
if (!find_pack_entry(real, &e)) {
/* Most likely it's a loose object. */
- if (!sha1_loose_object_info(real, oi, flags)) {
- oi->whence = OI_LOOSE;
+ if (!sha1_loose_object_info(real, oi, flags))
return 0;
- }
/* Not a loose object; someone else may have just packed it. */
- reprepare_packed_git();
- if (!find_pack_entry(real, &e))
+ if (flags & OBJECT_INFO_QUICK) {
return -1;
+ } else {
+ reprepare_packed_git();
+ if (!find_pack_entry(real, &e))
+ return -1;
+ }
}
- /*
- * packed_object_info() does not follow the delta chain to
- * find out the real type, unless it is given oi->typep.
- */
- if (oi->typename && !oi->typep)
- oi->typep = &real_type;
+ if (oi == &blank_oi)
+ /*
+ * We know that the caller doesn't actually need the
+ * information below, so return early.
+ */
+ return 0;
rtype = packed_object_info(e.p, e.offset, oi);
if (rtype < 0) {
mark_bad_packed_object(e.p, real);
- if (oi->typep == &real_type)
- oi->typep = NULL;
return sha1_object_info_extended(real, oi, 0);
- } else if (in_delta_base_cache(e.p, e.offset)) {
- oi->whence = OI_DBCACHED;
- } else {
- oi->whence = OI_PACKED;
+ } else if (oi->whence == OI_PACKED) {
oi->u.packed.offset = e.offset;
oi->u.packed.pack = e.p;
oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA ||
rtype == OBJ_OFS_DELTA);
}
- if (oi->typename)
- strbuf_addstr(oi->typename, typename(*oi->typep));
- if (oi->typep == &real_type)
- oi->typep = NULL;
return 0;
}
int sha1_object_info(const unsigned char *sha1, unsigned long *sizep)
{
enum object_type type;
- struct object_info oi = {NULL};
+ struct object_info oi = OBJECT_INFO_INIT;
oi.typep = &type;
oi.sizep = sizep;
- if (sha1_object_info_extended(sha1, &oi, LOOKUP_REPLACE_OBJECT) < 0)
+ if (sha1_object_info_extended(sha1, &oi,
+ OBJECT_INFO_LOOKUP_REPLACE) < 0)
return -1;
return type;
}
-static void *read_packed_sha1(const unsigned char *sha1,
- enum object_type *type, unsigned long *size)
-{
- struct pack_entry e;
- void *data;
-
- if (!find_pack_entry(sha1, &e))
- return NULL;
- data = cache_or_unpack_entry(e.p, e.offset, size, type);
- if (!data) {
- /*
- * We're probably in deep shit, but let's try to fetch
- * the required object anyway from another pack or loose.
- * This should happen only in the presence of a corrupted
- * pack, and is better than failing outright.
- */
- error("failed to read object %s at offset %"PRIuMAX" from %s",
- sha1_to_hex(sha1), (uintmax_t)e.offset, e.p->pack_name);
- mark_bad_packed_object(e.p, sha1);
- data = read_object(sha1, type, size);
- }
- return data;
-}
-
int pretend_sha1_file(void *buf, unsigned long len, enum object_type type,
unsigned char *sha1)
{
static void *read_object(const unsigned char *sha1, enum object_type *type,
unsigned long *size)
{
- unsigned long mapsize;
- void *map, *buf;
- struct cached_object *co;
-
- co = find_cached_object(sha1);
- if (co) {
- *type = co->type;
- *size = co->size;
- return xmemdupz(co->buf, co->size);
- }
+ struct object_info oi = OBJECT_INFO_INIT;
+ void *content;
+ oi.typep = type;
+ oi.sizep = size;
+ oi.contentp = &content;
- buf = read_packed_sha1(sha1, type, size);
- if (buf)
- return buf;
- map = map_sha1_file(sha1, &mapsize);
- if (map) {
- buf = unpack_sha1_file(map, mapsize, type, size, sha1);
- munmap(map, mapsize);
- return buf;
- }
- reprepare_packed_git();
- return read_packed_sha1(sha1, type, size);
+ if (sha1_object_info_extended(sha1, &oi, 0) < 0)
+ return NULL;
+ return content;
}
/*
void *read_sha1_file_extended(const unsigned char *sha1,
enum object_type *type,
unsigned long *size,
- unsigned flag)
+ int lookup_replace)
{
void *data;
const struct packed_git *p;
- const unsigned char *repl = lookup_replace_object_extended(sha1, flag);
+ const char *path;
+ struct stat st;
+ const unsigned char *repl = lookup_replace ? lookup_replace_object(sha1)
+ : sha1;
errno = 0;
data = read_object(repl, type, size);
die("replacement %s not found for %s",
sha1_to_hex(repl), sha1_to_hex(sha1));
- if (has_loose_object(repl)) {
- const char *path = sha1_file_name(sha1);
-
+ if (!stat_sha1_file(repl, &st, &path))
die("loose object %s (stored in %s) is corrupt",
sha1_to_hex(repl), path);
- }
if ((p = has_packed_and_bad(repl)) != NULL)
die("packed object %s (stored in %s) is corrupt",
if (has_loose_object(sha1))
return 0;
- buf = read_packed_sha1(sha1, &type, &len);
+ buf = read_object(sha1, &type, &len);
if (!buf)
return error("cannot read sha1_file for %s", sha1_to_hex(sha1));
hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(type), len) + 1;
int has_sha1_file_with_flags(const unsigned char *sha1, int flags)
{
- struct pack_entry e;
-
- if (find_pack_entry(sha1, &e))
- return 1;
- if (has_loose_object(sha1))
- return 1;
- if (flags & HAS_SHA1_QUICK)
+ if (!startup_info->have_repository)
return 0;
- reprepare_packed_git();
- return find_pack_entry(sha1, &e);
+ return sha1_object_info_extended(sha1, NULL,
+ flags | OBJECT_INFO_SKIP_CACHED) >= 0;
}
int has_object_file(const struct object_id *oid)
return has_sha1_file(oid->hash);
}
+int has_object_file_with_flags(const struct object_id *oid, int flags)
+{
+ return has_sha1_file_with_flags(oid->hash, flags);
+}
+
static void check_tree(const void *buf, size_t size)
{
struct tree_desc desc;
*/
if ((type == OBJ_BLOB) && path) {
struct strbuf nbuf = STRBUF_INIT;
- if (convert_to_git(path, buf, size, &nbuf,
+ if (convert_to_git(&the_index, path, buf, size, &nbuf,
write_object ? safe_crlf : SAFE_CRLF_FALSE)) {
buf = strbuf_detach(&nbuf, &size);
re_allocated = 1;
assert(path);
assert(would_convert_to_git_filter_fd(path));
- convert_to_git_filter_fd(path, fd, &sbuf,
+ convert_to_git_filter_fd(&the_index, path, fd, &sbuf,
write_object ? safe_crlf : SAFE_CRLF_FALSE);
if (write_object)
else if (!S_ISREG(st->st_mode))
ret = index_pipe(sha1, fd, type, path, flags);
else if (st->st_size <= big_file_threshold || type != OBJ_BLOB ||
- (path && would_convert_to_git(path)))
+ (path && would_convert_to_git(&the_index, path)))
ret = index_core(sha1, fd, xsize_t(st->st_size), type, path,
flags);
else
typename(expect));
}
-static int for_each_file_in_obj_subdir(int subdir_nr,
- struct strbuf *path,
- each_loose_object_fn obj_cb,
- each_loose_cruft_fn cruft_cb,
- each_loose_subdir_fn subdir_cb,
- void *data)
+int for_each_file_in_obj_subdir(unsigned int subdir_nr,
+ struct strbuf *path,
+ each_loose_object_fn obj_cb,
+ each_loose_cruft_fn cruft_cb,
+ each_loose_subdir_fn subdir_cb,
+ void *data)
{
- size_t baselen = path->len;
- DIR *dir = opendir(path->buf);
+ size_t origlen, baselen;
+ DIR *dir;
struct dirent *de;
int r = 0;
+ if (subdir_nr > 0xff)
+ BUG("invalid loose object subdirectory: %x", subdir_nr);
+
+ origlen = path->len;
+ strbuf_complete(path, '/');
+ strbuf_addf(path, "%02x", subdir_nr);
+ baselen = path->len;
+
+ dir = opendir(path->buf);
if (!dir) {
- if (errno == ENOENT)
- return 0;
- return error_errno("unable to open %s", path->buf);
+ if (errno != ENOENT)
+ r = error_errno("unable to open %s", path->buf);
+ strbuf_setlen(path, origlen);
+ return r;
}
while ((de = readdir(dir))) {
strbuf_setlen(path, baselen);
strbuf_addf(path, "/%s", de->d_name);
- if (strlen(de->d_name) == 38) {
- char hex[41];
- unsigned char sha1[20];
+ if (strlen(de->d_name) == GIT_SHA1_HEXSZ - 2) {
+ char hex[GIT_MAX_HEXSZ+1];
+ struct object_id oid;
- snprintf(hex, sizeof(hex), "%02x%s",
- subdir_nr, de->d_name);
- if (!get_sha1_hex(hex, sha1)) {
+ xsnprintf(hex, sizeof(hex), "%02x%s",
+ subdir_nr, de->d_name);
+ if (!get_oid_hex(hex, &oid)) {
if (obj_cb) {
- r = obj_cb(sha1, path->buf, data);
+ r = obj_cb(&oid, path->buf, data);
if (r)
break;
}
if (!r && subdir_cb)
r = subdir_cb(subdir_nr, path->buf, data);
+ strbuf_setlen(path, origlen);
+
return r;
}
each_loose_subdir_fn subdir_cb,
void *data)
{
- size_t baselen = path->len;
int r = 0;
int i;
for (i = 0; i < 256; i++) {
- strbuf_addf(path, "/%02x", i);
r = for_each_file_in_obj_subdir(i, path, obj_cb, cruft_cb,
subdir_cb, data);
- strbuf_setlen(path, baselen);
if (r)
break;
}
struct strbuf buf = STRBUF_INIT;
int r;
- /* copy base not including trailing '/' */
- strbuf_add(&buf, alt->base, alt->name - alt->base - 1);
+ strbuf_addstr(&buf, alt->path);
r = for_each_loose_file_in_objdir_buf(&buf,
data->cb, NULL, NULL,
data->data);
int r = 0;
for (i = 0; i < p->num_objects; i++) {
- const unsigned char *sha1 = nth_packed_object_sha1(p, i);
+ struct object_id oid;
- if (!sha1)
+ if (!nth_packed_object_oid(&oid, p, i))
return error("unable to get sha1 of object %u in %s",
i, p->pack_name);
- r = cb(sha1, p, i, data);
+ r = cb(&oid, p, i, data);
if (r)
break;
}
}
return r ? r : pack_errors;
}
+
+static int check_stream_sha1(git_zstream *stream,
+ const char *hdr,
+ unsigned long size,
+ const char *path,
+ const unsigned char *expected_sha1)
+{
+ git_SHA_CTX c;
+ unsigned char real_sha1[GIT_MAX_RAWSZ];
+ unsigned char buf[4096];
+ unsigned long total_read;
+ int status = Z_OK;
+
+ git_SHA1_Init(&c);
+ git_SHA1_Update(&c, hdr, stream->total_out);
+
+ /*
+ * We already read some bytes into hdr, but the ones up to the NUL
+ * do not count against the object's content size.
+ */
+ total_read = stream->total_out - strlen(hdr) - 1;
+
+ /*
+ * This size comparison must be "<=" to read the final zlib packets;
+ * see the comment in unpack_sha1_rest for details.
+ */
+ while (total_read <= size &&
+ (status == Z_OK || status == Z_BUF_ERROR)) {
+ stream->next_out = buf;
+ stream->avail_out = sizeof(buf);
+ if (size - total_read < stream->avail_out)
+ stream->avail_out = size - total_read;
+ status = git_inflate(stream, Z_FINISH);
+ git_SHA1_Update(&c, buf, stream->next_out - buf);
+ total_read += stream->next_out - buf;
+ }
+ git_inflate_end(stream);
+
+ if (status != Z_STREAM_END) {
+ error("corrupt loose object '%s'", sha1_to_hex(expected_sha1));
+ return -1;
+ }
+ if (stream->avail_in) {
+ error("garbage at end of loose object '%s'",
+ sha1_to_hex(expected_sha1));
+ return -1;
+ }
+
+ git_SHA1_Final(real_sha1, &c);
+ if (hashcmp(expected_sha1, real_sha1)) {
+ error("sha1 mismatch for %s (expected %s)", path,
+ sha1_to_hex(expected_sha1));
+ return -1;
+ }
+
+ return 0;
+}
+
+int read_loose_object(const char *path,
+ const unsigned char *expected_sha1,
+ enum object_type *type,
+ unsigned long *size,
+ void **contents)
+{
+ int ret = -1;
+ void *map = NULL;
+ unsigned long mapsize;
+ git_zstream stream;
+ char hdr[32];
+
+ *contents = NULL;
+
+ map = map_sha1_file_1(path, NULL, &mapsize);
+ if (!map) {
+ error_errno("unable to mmap %s", path);
+ goto out;
+ }
+
+ if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0) {
+ error("unable to unpack header of %s", path);
+ goto out;
+ }
+
+ *type = parse_sha1_header(hdr, size);
+ if (*type < 0) {
+ error("unable to parse header of %s", path);
+ git_inflate_end(&stream);
+ goto out;
+ }
+
+ if (*type == OBJ_BLOB) {
+ if (check_stream_sha1(&stream, hdr, *size, path, expected_sha1) < 0)
+ goto out;
+ } else {
+ *contents = unpack_sha1_rest(&stream, hdr, *size, expected_sha1);
+ if (!*contents) {
+ error("unable to unpack contents of %s", path);
+ git_inflate_end(&stream);
+ goto out;
+ }
+ if (check_sha1_signature(expected_sha1, *contents,
+ *size, typename(*type))) {
+ error("sha1 mismatch for %s (expected %s)", path,
+ sha1_to_hex(expected_sha1));
+ free(*contents);
+ goto out;
+ }
+ }
+
+ ret = 0; /* everything checks out */
+
+out:
+ if (map)
+ munmap(map, mapsize);
+ return ret;
+}