#endif
#endif
+const unsigned char null_sha1[20] = { 0, };
+
static unsigned int sha1_file_open_flag = O_NOATIME;
static unsigned hexval(char c)
return 0;
}
-static int get_sha1_file(const char *path, unsigned char *result)
-{
- char buffer[60];
- int fd = open(path, O_RDONLY);
- int len;
-
- if (fd < 0)
- return -1;
- len = read(fd, buffer, sizeof(buffer));
- close(fd);
- if (len < 40)
- return -1;
- return get_sha1_hex(buffer, result);
-}
-
-static char *git_dir, *git_object_dir, *git_index_file, *git_refs_dir;
+static char *git_dir, *git_object_dir, *git_index_file, *git_refs_dir,
+ *git_graft_file;
static void setup_git_env(void)
{
- git_dir = gitenv(GIT_DIR_ENVIRONMENT);
+ git_dir = getenv(GIT_DIR_ENVIRONMENT);
if (!git_dir)
git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
- git_object_dir = gitenv(DB_ENVIRONMENT);
+ git_object_dir = getenv(DB_ENVIRONMENT);
if (!git_object_dir) {
git_object_dir = xmalloc(strlen(git_dir) + 9);
sprintf(git_object_dir, "%s/objects", git_dir);
}
git_refs_dir = xmalloc(strlen(git_dir) + 6);
sprintf(git_refs_dir, "%s/refs", git_dir);
- git_index_file = gitenv(INDEX_ENVIRONMENT);
+ git_index_file = getenv(INDEX_ENVIRONMENT);
if (!git_index_file) {
git_index_file = xmalloc(strlen(git_dir) + 7);
sprintf(git_index_file, "%s/index", git_dir);
}
+ git_graft_file = getenv(GRAFT_ENVIRONMENT);
+ if (!git_graft_file)
+ git_graft_file = strdup(git_path("info/grafts"));
+}
+
+char *get_git_dir(void)
+{
+ if (!git_dir)
+ setup_git_env();
+ return git_dir;
}
char *get_object_directory(void)
return git_index_file;
}
+char *get_graft_file(void)
+{
+ if (!git_graft_file)
+ setup_git_env();
+ return git_graft_file;
+}
+
int safe_create_leading_directories(char *path)
{
char *pos = path;
return 0;
}
-int get_sha1(const char *str, unsigned char *sha1)
-{
- static const char *prefix[] = {
- "",
- "refs",
- "refs/tags",
- "refs/heads",
- "refs/snap",
- NULL
- };
- const char **p;
-
- if (!get_sha1_hex(str, sha1))
- return 0;
-
- for (p = prefix; *p; p++) {
- char * pathname = git_path("%s/%s", *p, str);
- if (!get_sha1_file(pathname, sha1))
- return 0;
- }
-
- return -1;
-}
-
char * sha1_to_hex(const unsigned char *sha1)
{
static char buffer[50];
return base;
}
-struct alternate_object_database *alt_odb;
+char *sha1_pack_name(const unsigned char *sha1)
+{
+ static const char hex[] = "0123456789abcdef";
+ static char *name, *base, *buf;
+ int i;
+
+ if (!base) {
+ const char *sha1_file_directory = get_object_directory();
+ int len = strlen(sha1_file_directory);
+ base = xmalloc(len + 60);
+ sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.pack", sha1_file_directory);
+ name = base + len + 11;
+ }
+
+ buf = name;
+
+ for (i = 0; i < 20; i++) {
+ unsigned int val = *sha1++;
+ *buf++ = hex[val >> 4];
+ *buf++ = hex[val & 0xf];
+ }
+
+ return base;
+}
+
+char *sha1_pack_index_name(const unsigned char *sha1)
+{
+ static const char hex[] = "0123456789abcdef";
+ static char *name, *base, *buf;
+ int i;
+
+ if (!base) {
+ const char *sha1_file_directory = get_object_directory();
+ int len = strlen(sha1_file_directory);
+ base = xmalloc(len + 60);
+ sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.idx", sha1_file_directory);
+ name = base + len + 11;
+ }
+
+ buf = name;
+
+ for (i = 0; i < 20; i++) {
+ unsigned int val = *sha1++;
+ *buf++ = hex[val >> 4];
+ *buf++ = hex[val & 0xf];
+ }
+
+ return base;
+}
+
+struct alternate_object_database *alt_odb_list;
+static struct alternate_object_database **alt_odb_tail;
/*
* Prepare alternate object database registry.
- * alt_odb points at an array of struct alternate_object_database.
- * This array is terminated with an element that has both its base
- * and name set to NULL. alt_odb[n] comes from n'th non-empty
- * element from colon separated ALTERNATE_DB_ENVIRONMENT environment
- * variable, and its base points at a statically allocated buffer
- * that contains "/the/directory/corresponding/to/.git/objects/...",
- * while its name points just after the slash at the end of
- * ".git/objects/" in the example above, and has enough space to hold
- * 40-byte hex SHA1, an extra slash for the first level indirection,
- * and the terminating NUL.
- * This function allocates the alt_odb array and all the strings
- * pointed by base fields of the array elements with one xmalloc();
- * the string pool immediately follows the array.
+ *
+ * The variable alt_odb_list points at the list of struct
+ * alternate_object_database. The elements on this list come from
+ * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
+ * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
+ * whose contents is exactly in the same format as that environment
+ * variable. Its base points at a statically allocated buffer that
+ * contains "/the/directory/corresponding/to/.git/objects/...", while
+ * its name points just after the slash at the end of ".git/objects/"
+ * in the example above, and has enough space to hold 40-byte hex
+ * SHA1, an extra slash for the first level indirection, and the
+ * terminating NUL.
*/
-void prepare_alt_odb(void)
+static void link_alt_odb_entries(const char *alt, const char *ep, int sep,
+ const char *relative_base)
{
- int pass, totlen, i;
const char *cp, *last;
- char *op = NULL;
- const char *alt = gitenv(ALTERNATE_DB_ENVIRONMENT) ? : "";
+ struct alternate_object_database *ent;
+ int base_len = -1;
+
+ last = alt;
+ while (last < ep) {
+ cp = last;
+ if (cp < ep && *cp == '#') {
+ while (cp < ep && *cp != sep)
+ cp++;
+ last = cp + 1;
+ continue;
+ }
+ for ( ; cp < ep && *cp != sep; cp++)
+ ;
+ if (last != cp) {
+ /* 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);
+ *alt_odb_tail = ent;
+ alt_odb_tail = &(ent->next);
+ ent->next = NULL;
+ 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] = ent->base[pfxlen + 3] = '/';
+ ent->base[entlen-1] = 0;
+ }
+ while (cp < ep && *cp == sep)
+ cp++;
+ last = cp;
+ }
+}
- if (alt_odb)
+void prepare_alt_odb(void)
+{
+ 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);
+
+ sprintf(path, "%s/info/alternates", get_object_directory());
+ fd = open(path, O_RDONLY);
+ if (fd < 0)
+ return;
+ if (fstat(fd, &st) || (st.st_size == 0)) {
+ close(fd);
return;
- /* The first pass counts how large an area to allocate to
- * hold the entire alt_odb structure, including array of
- * structs and path buffers for them. The second pass fills
- * the structure and prepares the path buffers for use by
- * fill_sha1_path().
- */
- for (totlen = pass = 0; pass < 2; pass++) {
- last = alt;
- i = 0;
- do {
- cp = strchr(last, ':') ? : last + strlen(last);
- if (last != cp) {
- /* 43 = 40-byte + 2 '/' + terminating NUL */
- int pfxlen = cp - last;
- int entlen = pfxlen + 43;
- if (pass == 0)
- totlen += entlen;
- else {
- alt_odb[i].base = op;
- alt_odb[i].name = op + pfxlen + 1;
- memcpy(op, last, pfxlen);
- op[pfxlen] = op[pfxlen + 3] = '/';
- op[entlen-1] = 0;
- op += entlen;
- }
- i++;
- }
- while (*cp && *cp == ':')
- cp++;
- last = cp;
- } while (*cp);
- if (pass)
- break;
- alt_odb = xmalloc(sizeof(*alt_odb) * (i + 1) + totlen);
- alt_odb[i].base = alt_odb[i].name = NULL;
- op = (char*)(&alt_odb[i+1]);
}
+ map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+ close(fd);
+ if (map == MAP_FAILED)
+ return;
+
+ link_alt_odb_entries(map, map + st.st_size, '\n',
+ get_object_directory());
+ munmap(map, st.st_size);
}
static char *find_sha1_file(const unsigned char *sha1, struct stat *st)
{
- int i;
char *name = sha1_file_name(sha1);
+ struct alternate_object_database *alt;
if (!stat(name, st))
return name;
prepare_alt_odb();
- for (i = 0; (name = alt_odb[i].name) != NULL; i++) {
+ for (alt = alt_odb_list; alt; alt = alt->next) {
+ name = alt->name;
fill_sha1_path(name, sha1);
- if (!stat(alt_odb[i].base, st))
- return alt_odb[i].base;
+ if (!stat(alt->base, st))
+ return alt->base;
}
return NULL;
}
int use_packed_git(struct packed_git *p)
{
+ if (!p->pack_size) {
+ struct stat st;
+ // We created the struct before we had the pack
+ stat(p->pack_name, &st);
+ if (!S_ISREG(st.st_mode))
+ die("packfile %s not a regular file", p->pack_name);
+ p->pack_size = st.st_size;
+ }
if (!p->pack_base) {
int fd;
struct stat st;
* this is cheap.
*/
if (memcmp((char*)(p->index_base) + p->index_size - 40,
- p->pack_base + p->pack_size - 20, 20))
+ p->pack_base + p->pack_size - 20, 20)) {
+
die("packfile %s does not match index.", p->pack_name);
+ }
}
p->pack_last_used = pack_used_ctr++;
p->pack_use_cnt++;
return p;
}
+struct packed_git *parse_pack_index(unsigned char *sha1)
+{
+ char *path = sha1_pack_index_name(sha1);
+ return parse_pack_index_file(sha1, path);
+}
+
+struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_path)
+{
+ struct packed_git *p;
+ unsigned long idx_size;
+ void *idx_map;
+ char *path;
+
+ if (check_packed_git_idx(idx_path, &idx_size, &idx_map))
+ return NULL;
+
+ path = sha1_pack_name(sha1);
+
+ p = xmalloc(sizeof(*p) + strlen(path) + 2);
+ strcpy(p->pack_name, path);
+ p->index_size = idx_size;
+ p->pack_size = 0;
+ p->index_base = idx_map;
+ p->next = NULL;
+ p->pack_base = NULL;
+ p->pack_last_used = 0;
+ p->pack_use_cnt = 0;
+ memcpy(p->sha1, sha1, 20);
+ return p;
+}
+
+void install_packed_git(struct packed_git *pack)
+{
+ pack->next = packed_git;
+ packed_git = pack;
+}
+
static void prepare_packed_git_one(char *objdir)
{
char path[PATH_MAX];
void prepare_packed_git(void)
{
- int i;
static int run_once = 0;
+ struct alternate_object_database *alt;
- if (run_once++)
+ if (run_once)
return;
-
prepare_packed_git_one(get_object_directory());
prepare_alt_odb();
- for (i = 0; alt_odb[i].base != NULL; i++) {
- alt_odb[i].name[0] = 0;
- prepare_packed_git_one(alt_odb[i].base);
+ for (alt = alt_odb_list; alt; alt = alt->next) {
+ alt->name[0] = 0;
+ prepare_packed_git_one(alt->base);
}
+ run_once = 1;
}
int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type)
}
static void *map_sha1_file_internal(const unsigned char *sha1,
- unsigned long *size,
- int say_error)
+ unsigned long *size)
{
struct stat st;
void *map;
char *filename = find_sha1_file(sha1, &st);
if (!filename) {
- if (say_error)
- error("cannot map sha1 file %s", sha1_to_hex(sha1));
return NULL;
}
break;
/* Fallthrough */
case 0:
- if (say_error)
- perror(filename);
return NULL;
}
}
map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
close(fd);
- if (-1 == (int)(long)map)
+ if (map == MAP_FAILED)
return NULL;
*size = st.st_size;
return map;
}
-void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
-{
- return map_sha1_file_internal(sha1, size, 1);
-}
-
int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size)
{
/* Get the data stream */
strcpy(type, "tag");
break;
default:
- die("corrupted pack file");
+ die("corrupted pack file %s containing object of kind %d",
+ p->pack_name, kind);
}
*store_size = 0; /* notyet */
}
strcpy(type, "tag");
break;
default:
- die("corrupted pack file");
+ die("corrupted pack file %s containing object of kind %d",
+ p->pack_name, kind);
}
if (sizep)
*sizep = size;
retval = unpack_entry_gently(entry, type, sizep);
unuse_packed_git(p);
if (!retval)
- die("corrupted pack file");
+ die("corrupted pack file %s", p->pack_name);
return retval;
}
return 0;
}
+struct packed_git *find_sha1_pack(const unsigned char *sha1,
+ 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))
+ return p;
+ }
+ return NULL;
+
+}
+
int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep)
{
int status;
z_stream stream;
char hdr[128];
- map = map_sha1_file_internal(sha1, &mapsize, 0);
+ map = map_sha1_file_internal(sha1, &mapsize);
if (!map) {
struct pack_entry e;
{
unsigned long mapsize;
void *map, *buf;
+ struct pack_entry e;
- map = map_sha1_file_internal(sha1, &mapsize, 0);
+ if (find_pack_entry(sha1, &e))
+ return read_packed_sha1(sha1, type, size);
+ map = map_sha1_file_internal(sha1, &mapsize);
if (map) {
buf = unpack_sha1_file(map, mapsize, type, size);
munmap(map, mapsize);
return buf;
}
- return read_packed_sha1(sha1, type, size);
+ return NULL;
}
void *read_object_with_reference(const unsigned char *sha1,
free(buffer);
return NULL;
}
+ free(buffer);
/* Now we have the ID of the referred-to object in
* actual_sha1. Check again. */
}
return 0;
}
-int write_sha1_from_fd(const unsigned char *sha1, int fd)
+int write_sha1_to_fd(int fd, const unsigned char *sha1)
+{
+ ssize_t size;
+ unsigned long objsize;
+ int posn = 0;
+ void *map = map_sha1_file_internal(sha1, &objsize);
+ void *buf = map;
+ void *temp_obj = NULL;
+ z_stream stream;
+
+ 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);
+
+ 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 */;
+
+ /* 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;
+ }
+
+ do {
+ size = write(fd, buf + posn, objsize - posn);
+ if (size <= 0) {
+ if (!size) {
+ fprintf(stderr, "write closed");
+ } else {
+ perror("write ");
+ }
+ return -1;
+ }
+ posn += size;
+ } while (posn < objsize);
+
+ if (map)
+ munmap(map, objsize);
+ if (temp_obj)
+ free(temp_obj);
+
+ return 0;
+}
+
+int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
+ size_t bufsize, size_t *bufposn)
{
char *filename = sha1_file_name(sha1);
int local;
z_stream stream;
unsigned char real_sha1[20];
- unsigned char buf[4096];
unsigned char discard[4096];
int ret;
SHA_CTX c;
do {
ssize_t size;
- size = read(fd, buf, 4096);
+ if (*bufposn) {
+ stream.avail_in = *bufposn;
+ stream.next_in = (unsigned char *) buffer;
+ do {
+ stream.next_out = discard;
+ stream.avail_out = sizeof(discard);
+ ret = inflate(&stream, Z_SYNC_FLUSH);
+ SHA1_Update(&c, discard, sizeof(discard) -
+ stream.avail_out);
+ } while (stream.avail_in && ret == Z_OK);
+ write(local, buffer, *bufposn - stream.avail_in);
+ memmove(buffer, buffer + *bufposn - stream.avail_in,
+ stream.avail_in);
+ *bufposn = stream.avail_in;
+ if (ret != Z_OK)
+ break;
+ }
+ size = read(fd, buffer + *bufposn, bufsize - *bufposn);
if (size <= 0) {
close(local);
unlink(filename);
perror("Reading from connection");
return -1;
}
- write(local, buf, size);
- stream.avail_in = size;
- stream.next_in = buf;
- do {
- stream.next_out = discard;
- stream.avail_out = sizeof(discard);
- ret = inflate(&stream, Z_SYNC_FLUSH);
- SHA1_Update(&c, discard, sizeof(discard) -
- stream.avail_out);
- } while (stream.avail_in && ret == Z_OK);
-
- } while (ret == Z_OK);
+ *bufposn += size;
+ } while (1);
inflateEnd(&stream);
close(local);
return 0;
}
+int has_pack_index(const unsigned char *sha1)
+{
+ struct stat st;
+ if (stat(sha1_pack_index_name(sha1), &st))
+ return 0;
+ return 1;
+}
+
+int has_pack_file(const unsigned char *sha1)
+{
+ struct stat st;
+ if (stat(sha1_pack_name(sha1), &st))
+ return 0;
+ return 1;
+}
+
int has_sha1_pack(const unsigned char *sha1)
{
struct pack_entry e;
struct stat st;
struct pack_entry e;
- if (find_sha1_file(sha1, &st))
+ if (find_pack_entry(sha1, &e))
return 1;
- return find_pack_entry(sha1, &e);
+ return find_sha1_file(sha1, &st) ? 1 : 0;
}
int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type)
if (size)
buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
close(fd);
- if ((int)(long)buf == -1)
+ if (buf == MAP_FAILED)
return -1;
if (!type)
projects / git.git / blobdiff