#endif
#endif
-const unsigned char null_sha1[20] = { 0, };
+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)
{
return 0;
}
-int adjust_shared_perm(const char *path)
-{
- struct stat st;
- int mode;
-
- if (!shared_repository)
- return 0;
- if (lstat(path, &st) < 0)
- return -1;
- mode = st.st_mode;
- if (mode & S_IRUSR)
- mode |= S_IRGRP;
- if (mode & S_IWUSR)
- mode |= S_IWGRP;
- if (mode & S_IXUSR)
- mode |= S_IXGRP;
- if (S_ISDIR(mode))
- mode |= S_ISGID;
- if (chmod(path, mode) < 0)
- return -2;
- return 0;
-}
-
int safe_create_leading_directories(char *path)
{
char *pos = path;
/*
* 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
struct alternate_object_database *alt_odb_list;
static struct alternate_object_database **alt_odb_tail;
+static void read_info_alternates(const char * alternates, int depth);
+
/*
* Prepare alternate object database registry.
*
* SHA1, an extra slash for the first level indirection, and the
* terminating NUL.
*/
-static void link_alt_odb_entries(const char *alt, const char *ep, int sep,
- const char *relative_base)
+static int link_alt_odb_entry(const char * entry, int len, const char * relative_base, int depth)
{
- const char *cp, *last;
- struct alternate_object_database *ent;
+ struct stat st;
const char *objdir = get_object_directory();
+ struct alternate_object_database *ent;
+ struct alternate_object_database *alt;
+ /* 43 = 40-byte + 2 '/' + terminating NUL */
+ int pfxlen = len;
+ int entlen = pfxlen + 43;
int base_len = -1;
+ if (*entry != '/' && relative_base) {
+ /* Relative alt-odb */
+ if (base_len < 0)
+ base_len = strlen(relative_base) + 1;
+ entlen += base_len;
+ pfxlen += base_len;
+ }
+ ent = xmalloc(sizeof(*ent) + entlen);
+
+ if (*entry != '/' && relative_base) {
+ memcpy(ent->base, relative_base, base_len - 1);
+ ent->base[base_len - 1] = '/';
+ memcpy(ent->base + base_len, entry, len);
+ }
+ else
+ memcpy(ent->base, entry, pfxlen);
+
+ ent->name = ent->base + pfxlen + 1;
+ ent->base[pfxlen + 3] = '/';
+ ent->base[pfxlen] = ent->base[entlen-1] = 0;
+
+ /* Detect cases where alternate disappeared */
+ if (stat(ent->base, &st) || !S_ISDIR(st.st_mode)) {
+ error("object directory %s does not exist; "
+ "check .git/objects/info/alternates.",
+ ent->base);
+ free(ent);
+ return -1;
+ }
+
+ /* Prevent the common mistake of listing the same
+ * thing twice, or object directory itself.
+ */
+ for (alt = alt_odb_list; alt; alt = alt->next) {
+ if (!memcmp(ent->base, alt->base, pfxlen)) {
+ free(ent);
+ return -1;
+ }
+ }
+ if (!memcmp(ent->base, objdir, pfxlen)) {
+ free(ent);
+ return -1;
+ }
+
+ /* add the alternate entry */
+ *alt_odb_tail = ent;
+ alt_odb_tail = &(ent->next);
+ ent->next = NULL;
+
+ /* recursively add alternates */
+ read_info_alternates(ent->base, depth + 1);
+
+ ent->base[pfxlen] = '/';
+
+ return 0;
+}
+
+static void link_alt_odb_entries(const char *alt, const char *ep, int sep,
+ const char *relative_base, int depth)
+{
+ const char *cp, *last;
+
+ if (depth > 5) {
+ error("%s: ignoring alternate object stores, nesting too deep.",
+ relative_base);
+ return;
+ }
+
last = alt;
while (last < ep) {
cp = last;
last = cp + 1;
continue;
}
- for ( ; cp < ep && *cp != sep; cp++)
- ;
+ while (cp < ep && *cp != sep)
+ cp++;
if (last != cp) {
- struct stat st;
- struct alternate_object_database *alt;
- /* 43 = 40-byte + 2 '/' + terminating NUL */
- int pfxlen = cp - last;
- int entlen = pfxlen + 43;
-
- if (*last != '/' && relative_base) {
- /* Relative alt-odb */
- if (base_len < 0)
- base_len = strlen(relative_base) + 1;
- entlen += base_len;
- pfxlen += base_len;
- }
- ent = xmalloc(sizeof(*ent) + entlen);
-
- if (*last != '/' && relative_base) {
- memcpy(ent->base, relative_base, base_len - 1);
- ent->base[base_len - 1] = '/';
- memcpy(ent->base + base_len,
- last, cp - last);
- }
- else
- memcpy(ent->base, last, pfxlen);
-
- ent->name = ent->base + pfxlen + 1;
- ent->base[pfxlen + 3] = '/';
- ent->base[pfxlen] = ent->base[entlen-1] = 0;
-
- /* Detect cases where alternate disappeared */
- if (stat(ent->base, &st) || !S_ISDIR(st.st_mode)) {
- error("object directory %s does not exist; "
- "check .git/objects/info/alternates.",
- ent->base);
- goto bad;
- }
- ent->base[pfxlen] = '/';
-
- /* Prevent the common mistake of listing the same
- * thing twice, or object directory itself.
- */
- for (alt = alt_odb_list; alt; alt = alt->next)
- if (!memcmp(ent->base, alt->base, pfxlen))
- goto bad;
- if (!memcmp(ent->base, objdir, pfxlen)) {
- bad:
- free(ent);
- }
- else {
- *alt_odb_tail = ent;
- alt_odb_tail = &(ent->next);
- ent->next = NULL;
+ if ((*last != '/') && depth) {
+ error("%s: ignoring relative alternate object store %s",
+ relative_base, last);
+ } else {
+ link_alt_odb_entry(last, cp - last,
+ relative_base, depth);
}
}
while (cp < ep && *cp == sep)
}
}
-void prepare_alt_odb(void)
+static void read_info_alternates(const char * relative_base, int depth)
{
- char path[PATH_MAX];
char *map;
- int fd;
struct stat st;
- char *alt;
-
- alt = getenv(ALTERNATE_DB_ENVIRONMENT);
- if (!alt) alt = "";
-
- if (alt_odb_tail)
- return;
- alt_odb_tail = &alt_odb_list;
- link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL);
+ char path[PATH_MAX];
+ int fd;
- sprintf(path, "%s/info/alternates", get_object_directory());
+ sprintf(path, "%s/info/alternates", relative_base);
fd = open(path, O_RDONLY);
if (fd < 0)
return;
if (map == MAP_FAILED)
return;
- link_alt_odb_entries(map, map + st.st_size, '\n',
- get_object_directory());
+ link_alt_odb_entries(map, map + st.st_size, '\n', relative_base, depth);
+
munmap(map, st.st_size);
}
+void prepare_alt_odb(void)
+{
+ const char *alt;
+
+ alt = getenv(ALTERNATE_DB_ENVIRONMENT);
+ if (!alt) alt = "";
+
+ if (alt_odb_tail)
+ return;
+ alt_odb_tail = &alt_odb_list;
+ link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL, 0);
+
+ read_info_alternates(get_object_directory(), 0);
+}
+
static char *find_sha1_file(const unsigned char *sha1, struct stat *st)
{
char *name = sha1_file_name(sha1);
{
if (!p->pack_size) {
struct stat st;
- // We created the struct before we had the pack
+ /* 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);
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())
die("packfile %s cannot be mapped.", p->pack_name);
p->pack_base = map;
+ /* Check if we understand this pack file. If we don't we're
+ * likely too old to handle it.
+ */
+ hdr = map;
+ if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
+ die("packfile %s isn't actually a pack.", p->pack_name);
+ if (!pack_version_ok(hdr->hdr_version))
+ die("packfile %s is version %i and not supported"
+ " (try upgrading GIT to a newer version)",
+ p->pack_name, ntohl(hdr->hdr_version));
+
/* Check if the pack file matches with the index file.
* this is cheap.
*/
- if (memcmp((char*)(p->index_base) + p->index_size - 40,
- p->pack_base + p->pack_size - 20, 20)) {
-
+ if (hashcmp((unsigned char *)(p->index_base) +
+ p->index_size - 40,
+ (unsigned char *)p->pack_base +
+ p->pack_size - 20)) {
die("packfile %s does not match index.", p->pack_name);
}
}
p->pack_use_cnt = 0;
p->pack_local = local;
if ((path_len > 44) && !get_sha1_hex(path + path_len - 44, sha1))
- memcpy(p->sha1, sha1, 20);
+ hashcpy(p->sha1, sha1);
return p;
}
p->pack_base = NULL;
p->pack_last_used = 0;
p->pack_use_cnt = 0;
- memcpy(p->sha1, sha1, 20);
+ hashcpy(p->sha1, sha1);
return p;
}
int namelen = strlen(de->d_name);
struct packed_git *p;
- if (strcmp(de->d_name + namelen - 4, ".idx"))
+ if (!has_extension(de->d_name, ".idx"))
continue;
/* we have .idx. Is it a file we can map? */
strcpy(path + len, de->d_name);
+ for (p = packed_git; p; p = p->next) {
+ if (!memcmp(path, p->pack_name, len + namelen - 4))
+ break;
+ }
+ if (p)
+ continue;
p = add_packed_git(path, len + namelen, local);
if (!p)
continue;
closedir(dir);
}
+static int prepare_packed_git_run_once = 0;
void prepare_packed_git(void)
{
- static int run_once = 0;
struct alternate_object_database *alt;
- if (run_once)
+ if (prepare_packed_git_run_once)
return;
prepare_packed_git_one(get_object_directory(), 1);
prepare_alt_odb();
prepare_packed_git_one(alt->base, 0);
alt->name[-1] = '/';
}
- run_once = 1;
+ prepare_packed_git_run_once = 1;
+}
+
+static 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)
SHA1_Update(&c, header, 1+sprintf(header, "%s %lu", type, size));
SHA1_Update(&c, map, size);
SHA1_Final(real_sha1, &c);
- return memcmp(sha1, real_sha1, 20) ? -1 : 0;
+ return hashcmp(sha1, real_sha1) ? -1 : 0;
}
-static void *map_sha1_file_internal(const unsigned char *sha1,
- unsigned long *size)
+void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
{
struct stat st;
void *map;
return map;
}
-int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size)
+int legacy_loose_object(unsigned char *map)
+{
+ unsigned int word;
+
+ /*
+ * Is it a zlib-compressed buffer? If so, the first byte
+ * must be 0x78 (15-bit window size, deflated), and the
+ * first 16-bit word is evenly divisible by 31
+ */
+ word = (map[0] << 8) + map[1];
+ if (map[0] == 0x78 && !(word % 31))
+ return 1;
+ else
+ return 0;
+}
+
+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 long size;
+ 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 */
+ };
+ enum object_type type;
+
/* Get the data stream */
memset(stream, 0, sizeof(*stream));
stream->next_in = map;
stream->avail_in = mapsize;
stream->next_out = buffer;
- stream->avail_out = size;
+ stream->avail_out = bufsiz;
+ if (legacy_loose_object(map)) {
+ inflateInit(stream);
+ return inflate(stream, 0);
+ }
+
+ used = unpack_object_header_gently(map, mapsize, &type, &size);
+ if (!used || !valid_loose_object_type[type])
+ return -1;
+ map += used;
+ mapsize -= used;
+
+ /* Set up the stream for the rest.. */
+ stream->next_in = map;
+ stream->avail_in = mapsize;
inflateInit(stream);
- return inflate(stream, 0);
+
+ /* And generate the fake traditional header */
+ stream->total_out = 1 + snprintf(buffer, bufsiz, "%s %lu",
+ type_names[type], size);
+ return 0;
}
static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size)
{
int bytes = strlen(buffer) + 1;
unsigned char *buf = xmalloc(1+size);
+ unsigned long n;
- memcpy(buf, buffer + bytes, stream->total_out - bytes);
- bytes = stream->total_out - bytes;
+ n = stream->total_out - bytes;
+ if (n > size)
+ n = size;
+ memcpy(buf, (char *) buffer + bytes, n);
+ bytes = n;
if (bytes < size) {
stream->next_out = buf + bytes;
stream->avail_out = size - bytes;
* too permissive for what we want to check. So do an anal
* object header parse by hand.
*/
-int parse_sha1_header(char *hdr, char *type, unsigned long *sizep)
+static int parse_sha1_header(char *hdr, char *type, unsigned long *sizep)
{
int i;
unsigned long size;
}
/* 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,
+ unsigned long offset,
char *type,
- unsigned long *sizep,
- struct packed_git *p)
+ unsigned long *sizep)
{
- struct pack_entry base_ent;
+ unsigned long base_offset;
+ unsigned char *base_sha1 = (unsigned char *) p->pack_base + offset;
- if (left < 20)
+ if (p->pack_size < offset + 20)
die("truncated pack file");
-
/* The base entry _must_ be in the same pack */
- if (!find_pack_entry_one(base_sha1, &base_ent, p))
+ base_offset = find_pack_entry_one(base_sha1, p);
+ if (!base_offset)
die("failed to find delta-pack base object %s",
sha1_to_hex(base_sha1));
+ offset += 20;
/* 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) {
memset(&stream, 0, sizeof(stream));
- data = stream.next_in = base_sha1 + 20;
- stream.avail_in = left - 20;
+ stream.next_in = (unsigned char *) p->pack_base + offset;
+ stream.avail_in = p->pack_size - offset;
stream.next_out = delta_head;
stream.avail_out = sizeof(delta_head);
static unsigned long unpack_object_header(struct packed_git *p, unsigned long offset,
enum object_type *type, unsigned long *sizep)
{
- unsigned shift;
- unsigned char *pack, c;
- unsigned long size;
+ unsigned long used;
- if (offset >= p->pack_size)
+ if (p->pack_size <= offset)
die("object offset outside of pack file");
- pack = p->pack_base + offset;
- c = *pack++;
- offset++;
- *type = (c >> 4) & 7;
- size = c & 15;
- shift = 4;
- while (c & 0x80) {
- if (offset >= p->pack_size)
- die("object offset outside of pack file");
- c = *pack++;
- offset++;
- size += (c & 0x7f) << shift;
- shift += 7;
- }
- *sizep = size;
- return offset;
+ used = unpack_object_header_gently((unsigned char *)p->pack_base +
+ offset,
+ p->pack_size - offset, type, sizep);
+ if (!used)
+ die("object offset outside of pack file");
+
+ return offset + used;
}
int check_reuse_pack_delta(struct packed_git *p, unsigned long offset,
ptr = unpack_object_header(p, ptr, kindp, sizep);
if (*kindp != OBJ_DELTA)
goto done;
- memcpy(base, p->pack_base + ptr, 20);
+ 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;
+ unsigned long val;
+ unsigned char *next_sha1;
enum object_type kind;
- offset = unpack_object_header(p, e->offset, &kind, size);
- pack = 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);
- memcpy(base_sha1, pack, 20);
- 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 = 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;
+ offset = unpack_object_header(p, offset, &kind, size);
+
+ for (;;) {
+ switch (kind) {
+ default:
+ die("corrupted pack file %s containing object of kind %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 */
+ return;
+ case OBJ_DELTA:
+ if (p->pack_size <= offset + 20)
+ die("pack file %s records an incomplete delta base",
+ p->pack_name);
+ next_sha1 = (unsigned char *) p->pack_base + offset;
+ if (*delta_chain_length == 0)
+ hashcpy(base_sha1, next_sha1);
+ offset = find_pack_entry_one(next_sha1, p);
+ break;
+ }
+ offset = unpack_object_header(p, offset, &kind, &val);
+ (*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;
+ unsigned long size;
enum object_type kind;
- int retval;
- if (use_packed_git(p))
- die("cannot map packed file");
+ offset = unpack_object_header(p, offset, &kind, &size);
- offset = unpack_object_header(p, entry->offset, &kind, &size);
- pack = p->pack_base + offset;
- left = p->pack_size - offset;
+ if (kind == OBJ_DELTA)
+ return packed_delta_info(p, offset, type, sizep);
switch (kind) {
- case OBJ_DELTA:
- retval = packed_delta_info(pack, size, left, type, sizep, p);
- unuse_packed_git(p);
- return retval;
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]);
break;
default:
die("corrupted pack file %s containing object of kind %d",
}
if (sizep)
*sizep = size;
- unuse_packed_git(p);
return 0;
}
-/* forward declaration for a mutually recursive function */
-static void *unpack_entry(struct pack_entry *, char *, unsigned long *);
-
-static void *unpack_delta_entry(unsigned char *base_sha1,
- unsigned long delta_size,
- unsigned long left,
- char *type,
- unsigned long *sizep,
- struct packed_git *p)
-{
- struct pack_entry base_ent;
- void *data, *delta_data, *result, *base;
- unsigned long data_size, result_size, base_size;
- z_stream stream;
- int st;
-
- 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);
- if (!base)
- die("failed to read delta-pack base object %s",
- sha1_to_hex(base_sha1));
-
- data = base_sha1 + 20;
- data_size = left - 20;
- delta_data = xmalloc(delta_size);
-
- memset(&stream, 0, sizeof(stream));
-
- stream.next_in = data;
- stream.avail_in = data_size;
- stream.next_out = delta_data;
- stream.avail_out = delta_size;
-
- inflateInit(&stream);
- st = inflate(&stream, Z_FINISH);
- inflateEnd(&stream);
- if ((st != Z_STREAM_END) || stream.total_out != delta_size)
- die("delta data unpack failed");
-
- result = patch_delta(base, base_size,
- delta_data, delta_size,
- &result_size);
- if (!result)
- die("failed to apply delta");
- free(delta_data);
- free(base);
- *sizep = result_size;
- return result;
-}
-
-static void *unpack_non_delta_entry(unsigned char *data,
- unsigned long size,
- unsigned long left)
+static void *unpack_compressed_entry(struct packed_git *p,
+ unsigned long offset,
+ unsigned long size)
{
int st;
z_stream stream;
buffer = xmalloc(size + 1);
buffer[size] = 0;
memset(&stream, 0, sizeof(stream));
- stream.next_in = data;
- stream.avail_in = left;
+ stream.next_in = (unsigned char*)p->pack_base + offset;
+ stream.avail_in = p->pack_size - offset;
stream.next_out = buffer;
stream.avail_out = size;
return buffer;
}
+static void *unpack_delta_entry(struct packed_git *p,
+ unsigned long offset,
+ unsigned long delta_size,
+ char *type,
+ unsigned long *sizep)
+{
+ void *delta_data, *result, *base;
+ unsigned long result_size, base_size, base_offset;
+ unsigned char *base_sha1;
+
+ if (p->pack_size < offset + 20)
+ die("truncated pack file");
+ /* The base entry _must_ be in the same pack */
+ base_sha1 = (unsigned char*)p->pack_base + offset;
+ base_offset = find_pack_entry_one(base_sha1, p);
+ if (!base_offset)
+ die("failed to find delta-pack base object %s",
+ sha1_to_hex(base_sha1));
+ offset += 20;
+
+ base = unpack_entry_gently(p, base_offset, type, &base_size);
+ if (!base)
+ die("failed to read delta base object at %lu from %s",
+ base_offset, p->pack_name);
+
+ delta_data = unpack_compressed_entry(p, offset, delta_size);
+ result = patch_delta(base, base_size,
+ delta_data, delta_size,
+ &result_size);
+ if (!result)
+ die("failed to apply delta");
+ free(delta_data);
+ free(base);
+ *sizep = result_size;
+ return result;
+}
+
static void *unpack_entry(struct pack_entry *entry,
char *type, unsigned long *sizep)
{
if (use_packed_git(p))
die("cannot map packed file");
- retval = unpack_entry_gently(entry, type, sizep);
+ retval = unpack_entry_gently(p, entry->offset, type, sizep);
unuse_packed_git(p);
if (!retval)
die("corrupted pack file %s", p->pack_name);
}
/* The caller is responsible for use_packed_git()/unuse_packed_git() pair */
-void *unpack_entry_gently(struct pack_entry *entry,
+void *unpack_entry_gently(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;
+ unsigned long size;
enum object_type kind;
- void *retval;
- offset = unpack_object_header(p, entry->offset, &kind, &size);
- pack = p->pack_base + offset;
- left = p->pack_size - offset;
+ offset = unpack_object_header(p, offset, &kind, &size);
switch (kind) {
case OBJ_DELTA:
- retval = unpack_delta_entry(pack, size, left, type, sizep, p);
- return retval;
+ return unpack_delta_entry(p, offset, size, type, sizep);
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;
+ strcpy(type, type_names[kind]);
+ *sizep = size;
+ return unpack_compressed_entry(p, offset, size);
default:
return NULL;
}
- *sizep = size;
- retval = unpack_non_delta_entry(pack, size, left);
- return retval;
}
int num_packed_objects(const struct packed_git *p)
void *index = p->index_base + 256;
if (n < 0 || num_packed_objects(p) <= n)
return -1;
- memcpy(sha1, (index + 24 * n + 4), 20);
+ hashcpy(sha1, (unsigned char *) index + (24 * n) + 4);
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 = memcmp(index + 24 * mi + 4, sha1, 20);
- if (!cmp) {
- e->offset = ntohl(*((int*)(index + 24 * mi)));
- memcpy(e->sha1, sha1, 20);
- e->p = p;
- return 1;
- }
+ int cmp = hashcmp((unsigned char *)index + (24 * mi) + 4, sha1);
+ 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 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 (!strcmp(p->pack_name, *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;
z_stream stream;
char hdr[128];
- map = map_sha1_file_internal(sha1, &mapsize);
+ map = map_sha1_file(sha1, &mapsize);
if (!map) {
struct pack_entry e;
- if (!find_pack_entry(sha1, &e))
- return error("unable to find %s", sha1_to_hex(sha1));
- return packed_object_info(&e, type, sizep);
+ if (!find_pack_entry(sha1, &e, NULL)) {
+ reprepare_packed_git();
+ if (!find_pack_entry(sha1, &e, NULL))
+ return error("unable to find %s", sha1_to_hex(sha1));
+ }
+ if (use_packed_git(e.p))
+ die("cannot map packed file");
+ status = packed_object_info(e.p, e.offset, type, sizep);
+ unuse_packed_git(e.p);
+ return status;
}
if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0)
status = error("unable to unpack %s header",
{
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;
}
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_internal(sha1, &mapsize);
+ map = map_sha1_file(sha1, &mapsize);
if (map) {
buf = unpack_sha1_file(map, mapsize, type, size);
munmap(map, mapsize);
return buf;
}
+ reprepare_packed_git();
+ if (find_pack_entry(sha1, &e, NULL))
+ return read_packed_sha1(sha1, type, size);
return NULL;
}
unsigned long isize;
unsigned char actual_sha1[20];
- memcpy(actual_sha1, sha1, 20);
+ hashcpy(actual_sha1, sha1);
while (1) {
int ref_length = -1;
const char *ref_type = NULL;
if (!strcmp(type, required_type)) {
*size = isize;
if (actual_sha1_return)
- memcpy(actual_sha1_return, actual_sha1, 20);
+ hashcpy(actual_sha1_return, actual_sha1);
return buffer;
}
/* Handle references */
ref_length = strlen(ref_type);
if (memcmp(buffer, ref_type, ref_length) ||
- get_sha1_hex(buffer + ref_length, actual_sha1)) {
+ get_sha1_hex((char *) buffer + ref_length, actual_sha1)) {
free(buffer);
return NULL;
}
*
* 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;
if (!link(tmpfile, filename))
return 0;
/*
- * Try to mkdir the last path component if that failed
- * with an ENOENT.
+ * Try to mkdir the last path component if that failed.
*
* Re-try the "link()" regardless of whether the mkdir
* succeeds, since a race might mean that somebody
* else succeeded.
*/
ret = errno;
- if (ret == ENOENT) {
- char *dir = strrchr(filename, '/');
- if (dir) {
- *dir = 0;
- mkdir(filename, 0777);
- if (adjust_shared_perm(filename))
- return -2;
- *dir = '/';
- if (!link(tmpfile, filename))
- return 0;
- ret = errno;
- }
+ dir = strrchr(filename, '/');
+ if (dir) {
+ *dir = 0;
+ mkdir(filename, 0777);
+ if (adjust_shared_perm(filename))
+ return -2;
+ *dir = '/';
+ if (!link(tmpfile, filename))
+ return 0;
+ ret = errno;
}
return ret;
}
/*
* 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);
return 0;
}
+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;
+ }
+ return 0;
+}
+
+static int write_binary_header(unsigned char *hdr, enum object_type type, unsigned long len)
+{
+ int hdr_len;
+ unsigned char c;
+
+ c = (type << 4) | (len & 15);
+ len >>= 4;
+ hdr_len = 1;
+ while (len) {
+ *hdr++ = c | 0x80;
+ hdr_len++;
+ c = (len & 0x7f);
+ len >>= 7;
+ }
+ *hdr = c;
+ return hdr_len;
+}
+
+static void setup_object_header(z_stream *stream, const char *type, unsigned long len)
+{
+ int obj_type, hdr;
+
+ if (use_legacy_headers) {
+ while (deflate(stream, 0) == Z_OK)
+ /* nothing */;
+ return;
+ }
+ if (!strcmp(type, blob_type))
+ obj_type = OBJ_BLOB;
+ else if (!strcmp(type, tree_type))
+ obj_type = OBJ_TREE;
+ else if (!strcmp(type, commit_type))
+ obj_type = OBJ_COMMIT;
+ else if (!strcmp(type, tag_type))
+ obj_type = OBJ_TAG;
+ else
+ die("trying to generate bogus object of type '%s'", type);
+ hdr = write_binary_header(stream->next_out, obj_type, len);
+ stream->total_out = hdr;
+ stream->next_out += hdr;
+ stream->avail_out -= hdr;
+}
+
int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1)
{
int size;
*/
filename = write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
if (returnsha1)
- memcpy(returnsha1, sha1, 20);
+ hashcpy(returnsha1, sha1);
if (has_sha1_file(sha1))
return 0;
fd = open(filename, O_RDONLY);
/* Set it up */
memset(&stream, 0, sizeof(stream));
- deflateInit(&stream, Z_BEST_COMPRESSION);
- size = deflateBound(&stream, len+hdrlen);
+ deflateInit(&stream, zlib_compression_level);
+ size = 8 + deflateBound(&stream, len+hdrlen);
compressed = xmalloc(size);
/* Compress it */
/* First header.. */
stream.next_in = hdr;
stream.avail_in = hdrlen;
- while (deflate(&stream, 0) == Z_OK)
- /* nothing */;
+ setup_object_header(&stream, type, len);
/* Then the data itself.. */
stream.next_in = buf;
deflateEnd(&stream);
size = stream.total_out;
- if (write(fd, compressed, size) != size)
- die("unable to write file");
+ if (write_buffer(fd, compressed, size) < 0)
+ die("unable to write sha1 file");
fchmod(fd, 0444);
close(fd);
free(compressed);
return move_temp_to_file(tmpfile, filename);
}
-int write_sha1_to_fd(int fd, const unsigned char *sha1)
+/*
+ * We need to unpack and recompress the object for writing
+ * it out to a different file.
+ */
+static void *repack_object(const unsigned char *sha1, unsigned long *objsize)
{
- ssize_t size;
- unsigned long objsize;
- int posn = 0;
- void *map = map_sha1_file_internal(sha1, &objsize);
- void *buf = map;
- void *temp_obj = NULL;
+ size_t size;
z_stream stream;
+ unsigned char *unpacked;
+ unsigned long len;
+ char type[20];
+ char hdr[50];
+ int hdrlen;
+ void *buf;
- if (!buf) {
- unsigned char *unpacked;
- unsigned long len;
- char type[20];
- char hdr[50];
- int hdrlen;
- // need to unpack and recompress it by itself
- unpacked = read_packed_sha1(sha1, type, &len);
+ /* need to unpack and recompress it by itself */
+ unpacked = read_packed_sha1(sha1, type, &len);
- hdrlen = sprintf(hdr, "%s %lu", type, len) + 1;
+ hdrlen = sprintf(hdr, "%s %lu", type, len) + 1;
- /* Set it up */
- memset(&stream, 0, sizeof(stream));
- deflateInit(&stream, Z_BEST_COMPRESSION);
- size = deflateBound(&stream, len + hdrlen);
- temp_obj = buf = xmalloc(size);
-
- /* Compress it */
- stream.next_out = buf;
- stream.avail_out = size;
-
- /* First header.. */
- stream.next_in = (void *)hdr;
- stream.avail_in = hdrlen;
- while (deflate(&stream, 0) == Z_OK)
- /* nothing */;
+ /* Set it up */
+ memset(&stream, 0, sizeof(stream));
+ deflateInit(&stream, zlib_compression_level);
+ size = deflateBound(&stream, len + hdrlen);
+ buf = xmalloc(size);
- /* Then the data itself.. */
- stream.next_in = unpacked;
- stream.avail_in = len;
- while (deflate(&stream, Z_FINISH) == Z_OK)
- /* nothing */;
- deflateEnd(&stream);
- free(unpacked);
-
- objsize = stream.total_out;
- }
+ /* Compress it */
+ stream.next_out = buf;
+ stream.avail_out = size;
- do {
- size = write(fd, buf + posn, objsize - posn);
- if (size <= 0) {
- if (!size) {
- fprintf(stderr, "write closed\n");
- } else {
- perror("write ");
- }
- return -1;
- }
- posn += size;
- } while (posn < objsize);
+ /* First header.. */
+ stream.next_in = (void *)hdr;
+ stream.avail_in = hdrlen;
+ while (deflate(&stream, 0) == Z_OK)
+ /* nothing */;
+
+ /* Then the data itself.. */
+ stream.next_in = unpacked;
+ stream.avail_in = len;
+ while (deflate(&stream, Z_FINISH) == Z_OK)
+ /* nothing */;
+ deflateEnd(&stream);
+ free(unpacked);
- if (map)
- munmap(map, objsize);
- if (temp_obj)
- free(temp_obj);
+ *objsize = stream.total_out;
+ return buf;
+}
- return 0;
+int write_sha1_to_fd(int fd, const unsigned char *sha1)
+{
+ int retval;
+ unsigned long objsize;
+ void *buf = map_sha1_file(sha1, &objsize);
+
+ if (buf) {
+ retval = write_buffer(fd, buf, objsize);
+ munmap(buf, objsize);
+ return retval;
+ }
+
+ buf = repack_object(sha1, &objsize);
+ retval = write_buffer(fd, buf, objsize);
+ free(buf);
+ return retval;
}
int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
SHA1_Update(&c, discard, sizeof(discard) -
stream.avail_out);
} while (stream.avail_in && ret == Z_OK);
- write(local, buffer, *bufposn - stream.avail_in);
+ if (write_buffer(local, buffer, *bufposn - stream.avail_in) < 0)
+ die("unable to write sha1 file");
memmove(buffer, buffer + *bufposn - stream.avail_in,
stream.avail_in);
*bufposn = stream.avail_in;
unlink(tmpfile);
return error("File %s corrupted", sha1_to_hex(sha1));
}
- if (memcmp(sha1, real_sha1, 20)) {
+ if (hashcmp(sha1, real_sha1)) {
unlink(tmpfile);
return error("File %s has bad hash", sha1_to_hex(sha1));
}
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;
}
-int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object)
+/*
+ * reads from fd as long as possible into a supplied buffer of size bytes.
+ * If necessary the buffer's size is increased using realloc()
+ *
+ * returns 0 if anything went fine and -1 otherwise
+ *
+ * NOTE: both buf and size may change, but even when -1 is returned
+ * you still have to free() it yourself.
+ */
+int read_pipe(int fd, char** return_buf, unsigned long* return_size)
{
- unsigned long size = 4096;
- char *buf = malloc(size);
- int iret, ret;
+ char* buf = *return_buf;
+ unsigned long size = *return_size;
+ int iret;
unsigned long off = 0;
- unsigned char hdr[50];
- int hdrlen;
+
do {
- iret = read(fd, buf + off, size - off);
+ iret = xread(fd, buf + off, size - off);
if (iret > 0) {
off += iret;
if (off == size) {
size *= 2;
- buf = realloc(buf, size);
+ buf = xrealloc(buf, size);
}
}
} while (iret > 0);
- if (iret < 0) {
+
+ *return_buf = buf;
+ *return_size = off;
+
+ if (iret < 0)
+ return -1;
+ return 0;
+}
+
+int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object)
+{
+ unsigned long size = 4096;
+ char *buf = xmalloc(size);
+ int ret;
+ unsigned char hdr[50];
+ int hdrlen;
+
+ if (read_pipe(fd, &buf, &size)) {
free(buf);
return -1;
}
+
if (!type)
type = blob_type;
if (write_object)
- ret = write_sha1_file(buf, off, type, sha1);
+ ret = write_sha1_file(buf, size, type, sha1);
else {
- write_sha1_file_prepare(buf, off, type, sha1, hdr, &hdrlen);
+ write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen);
ret = 0;
}
free(buf);