char * sha1_to_hex(const unsigned char *sha1)
{
- static char buffer[50];
+ static int bufno;
+ static char hexbuffer[4][50];
static const char hex[] = "0123456789abcdef";
- char *buf = buffer;
+ char *buffer = hexbuffer[3 & ++bufno], *buf = buffer;
int i;
for (i = 0; i < 20; i++) {
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)
+{
+ 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);
* the result size.
*/
data = delta_head;
- get_delta_hdr_size(&data); /* ignore base size */
+
+ /* ignore base size */
+ get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
/* Read the result size */
- result_size = get_delta_hdr_size(&data);
+ result_size = get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
*sizep = result_size;
}
return 0;
unsigned char *base_sha1)
{
struct packed_git *p = e->p;
- unsigned long offset, left;
+ unsigned long offset;
unsigned char *pack;
enum object_type kind;
offset = unpack_object_header(p, e->offset, &kind, size);
pack = p->pack_base + offset;
- left = p->pack_size - 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;
int mi = (lo + hi) / 2;
int cmp = memcmp(index + 24 * mi + 4, sha1, 20);
if (!cmp) {
- e->offset = ntohl(*((int*)(index + 24 * mi)));
+ e->offset = ntohl(*((unsigned int *)(index + 24 * mi)));
memcpy(e->sha1, sha1, 20);
e->p = p;
return 1;
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 += size;
+ }
+ return 0;
+}
+
int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1)
{
int size;
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, Z_BEST_COMPRESSION);
+ 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 */;
- if (map)
- munmap(map, objsize);
- if (temp_obj)
- free(temp_obj);
+ /* Then the data itself.. */
+ stream.next_in = unpacked;
+ stream.avail_in = len;
+ while (deflate(&stream, Z_FINISH) == Z_OK)
+ /* nothing */;
+ deflateEnd(&stream);
+ free(unpacked);
- return 0;
+ *objsize = stream.total_out;
+ return buf;
+}
+
+int write_sha1_to_fd(int fd, const unsigned char *sha1)
+{
+ int retval;
+ unsigned long objsize;
+ void *buf = map_sha1_file_internal(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;
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 neccessary 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) {
}
}
} 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 = malloc(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);