const unsigned char null_sha1[20];
-static unsigned int sha1_file_open_flag = O_NOATIME;
-
const 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 */
return base;
}
-char *sha1_pack_name(const unsigned char *sha1)
+static char *sha1_get_pack_name(const unsigned char *sha1,
+ char **name, char **base, const char *which)
{
static const char hex[] = "0123456789abcdef";
- static char *name, *base, *buf;
+ char *buf;
int i;
- if (!base) {
+ 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;
+ *base = xmalloc(len + 60);
+ sprintf(*base, "%s/pack/pack-1234567890123456789012345678901234567890.%s",
+ sha1_file_directory, which);
+ *name = *base + len + 11;
}
- buf = name;
+ buf = *name;
for (i = 0; i < 20; i++) {
unsigned int val = *sha1++;
*buf++ = hex[val & 0xf];
}
- return base;
+ return *base;
}
-char *sha1_pack_index_name(const unsigned char *sha1)
+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.idx", sha1_file_directory);
- name = base + len + 11;
- }
+ static char *name, *base;
- buf = name;
+ return sha1_get_pack_name(sha1, &name, &base, "pack");
+}
- for (i = 0; i < 20; i++) {
- unsigned int val = *sha1++;
- *buf++ = hex[val >> 4];
- *buf++ = hex[val & 0xf];
- }
+char *sha1_pack_index_name(const unsigned char *sha1)
+{
+ static char *name, *base;
- return base;
+ return sha1_get_pack_name(sha1, &name, &base, "idx");
}
struct alternate_object_database *alt_odb_list;
munmap(map, mapsz);
}
+void add_to_alternates_file(const char *reference)
+{
+ struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
+ int fd = hold_lock_file_for_append(lock, git_path("objects/info/alternates"), 1);
+ char *alt = mkpath("%s/objects\n", reference);
+ write_or_die(fd, alt, strlen(alt));
+ if (commit_lock_file(lock))
+ die("could not close alternates file");
+ if (alt_odb_tail)
+ link_alt_odb_entries(alt, alt + strlen(alt), '\n', NULL, 0);
+}
+
void prepare_alt_odb(void)
{
const char *alt;
read_info_alternates(get_object_directory(), 0);
}
-static char *find_sha1_file(const unsigned char *sha1, struct stat *st)
+static int has_loose_object(const unsigned char *sha1)
{
char *name = sha1_file_name(sha1);
struct alternate_object_database *alt;
- if (!stat(name, st))
- return name;
+ if (!access(name, F_OK))
+ return 1;
prepare_alt_odb();
for (alt = alt_odb_list; alt; alt = alt->next) {
name = alt->name;
fill_sha1_path(name, sha1);
- if (!stat(alt->base, st))
- return alt->base;
+ if (!access(alt->base, F_OK))
+ return 1;
}
- return NULL;
+ return 0;
}
static unsigned int pack_used_ctr;
return hashcmp(sha1, real_sha1) ? -1 : 0;
}
+static int git_open_noatime(const char *name)
+{
+ static int sha1_file_open_flag = O_NOATIME;
+ int fd = open(name, O_RDONLY | sha1_file_open_flag);
+
+ /* Might the failure be due to O_NOATIME? */
+ if (fd < 0 && errno != ENOENT && sha1_file_open_flag) {
+ fd = open(name, O_RDONLY);
+ if (fd >= 0)
+ sha1_file_open_flag = 0;
+ }
+ return fd;
+}
+
+static int open_sha1_file(const unsigned char *sha1)
+{
+ int fd;
+ char *name = sha1_file_name(sha1);
+ struct alternate_object_database *alt;
+
+ fd = git_open_noatime(name);
+ if (fd >= 0)
+ return fd;
+
+ prepare_alt_odb();
+ errno = ENOENT;
+ for (alt = alt_odb_list; alt; alt = alt->next) {
+ name = alt->name;
+ fill_sha1_path(name, sha1);
+ fd = git_open_noatime(alt->base);
+ if (fd >= 0)
+ return fd;
+ }
+ return -1;
+}
+
static void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
{
- struct stat st;
void *map;
int fd;
- char *filename = find_sha1_file(sha1, &st);
- if (!filename) {
- return NULL;
- }
+ fd = open_sha1_file(sha1);
+ map = NULL;
+ if (fd >= 0) {
+ struct stat st;
- fd = open(filename, O_RDONLY | sha1_file_open_flag);
- if (fd < 0) {
- /* See if it works without O_NOATIME */
- switch (sha1_file_open_flag) {
- default:
- fd = open(filename, O_RDONLY);
- if (fd >= 0)
- break;
- /* Fallthrough */
- case 0:
- return NULL;
+ if (!fstat(fd, &st)) {
+ *size = xsize_t(st.st_size);
+ map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0);
}
-
- /* If it failed once, it will probably fail again.
- * Stop using O_NOATIME
- */
- sha1_file_open_flag = 0;
+ close(fd);
}
- *size = xsize_t(st.st_size);
- map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0);
- close(fd);
return map;
}
SHA1_Final(sha1, &c);
}
-/*
- * Link the tempfile to the final place, possibly creating the
- * last directory level as you do so.
- *
- * Returns the errno on failure, 0 on success.
- */
-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.
- *
- * Re-try the "link()" regardless of whether the mkdir
- * succeeds, since a race might mean that somebody
- * else succeeded.
- */
- ret = errno;
- dir = strrchr(filename, '/');
- if (dir) {
- *dir = 0;
- if (!mkdir(filename, 0777) && adjust_shared_perm(filename)) {
- *dir = '/';
- 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, const char *filename)
{
- int ret = link_temp_to_file(tmpfile, filename);
+ int ret = link(tmpfile, filename);
/*
* Coda hack - coda doesn't like cross-directory links,
return 0;
}
+/* Finalize a file on disk, and close it. */
+static void close_sha1_file(int fd)
+{
+ /* For safe-mode, we could fsync_or_die(fd, "sha1 file") here */
+ fchmod(fd, 0444);
+ if (close(fd) != 0)
+ die("unable to write sha1 file");
+}
+
+/* Size of directory component, including the ending '/' */
+static inline int directory_size(const char *filename)
+{
+ const char *s = strrchr(filename, '/');
+ if (!s)
+ return 0;
+ return s - filename + 1;
+}
+
+/*
+ * This creates a temporary file in the same directory as the final
+ * 'filename'
+ *
+ * We want to avoid cross-directory filename renames, because those
+ * can have problems on various filesystems (FAT, NFS, Coda).
+ */
+static int create_tmpfile(char *buffer, size_t bufsiz, const char *filename)
+{
+ int fd, dirlen = directory_size(filename);
+
+ if (dirlen + 20 > bufsiz) {
+ errno = ENAMETOOLONG;
+ return -1;
+ }
+ memcpy(buffer, filename, dirlen);
+ strcpy(buffer + dirlen, "tmp_obj_XXXXXX");
+ fd = mkstemp(buffer);
+ if (fd < 0 && dirlen) {
+ /* Make sure the directory exists */
+ buffer[dirlen-1] = 0;
+ if (mkdir(buffer, 0777) && adjust_shared_perm(buffer))
+ return -1;
+
+ /* Try again */
+ strcpy(buffer + dirlen - 1, "/tmp_obj_XXXXXX");
+ fd = mkstemp(buffer);
+ }
+ return fd;
+}
+
static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen,
void *buf, unsigned long len, time_t mtime)
{
return error("sha1 file %s: %s\n", filename, strerror(errno));
}
- snprintf(tmpfile, sizeof(tmpfile), "%s/tmp_obj_XXXXXX", get_object_directory());
-
- fd = mkstemp(tmpfile);
+ fd = create_tmpfile(tmpfile, sizeof(tmpfile), filename);
if (fd < 0) {
if (errno == EPERM)
return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
if (write_buffer(fd, compressed, size) < 0)
die("unable to write sha1 file");
- fchmod(fd, 0444);
- if (close(fd))
- die("unable to write sha1 file");
+ close_sha1_file(fd);
free(compressed);
if (mtime) {
int force_object_loose(const unsigned char *sha1, time_t mtime)
{
- struct stat st;
void *buf;
unsigned long len;
enum object_type type;
char hdr[32];
int hdrlen;
- if (find_sha1_file(sha1, &st))
+ if (has_loose_object(sha1))
return 0;
buf = read_packed_sha1(sha1, &type, &len);
if (!buf)
return write_loose_object(sha1, hdr, hdrlen, buf, len, mtime);
}
-/*
- * 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)
-{
- size_t size;
- z_stream stream;
- unsigned char *unpacked;
- unsigned long len;
- enum object_type type;
- char hdr[32];
- int hdrlen;
- void *buf;
-
- /* need to unpack and recompress it by itself */
- unpacked = read_packed_sha1(sha1, &type, &len);
- if (!unpacked)
- error("cannot read sha1_file for %s", sha1_to_hex(sha1));
-
- hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1;
-
- /* Set it up */
- memset(&stream, 0, sizeof(stream));
- deflateInit(&stream, zlib_compression_level);
- size = deflateBound(&stream, len + hdrlen);
- 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;
- return buf;
-}
-
-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,
- size_t bufsize, size_t *bufposn)
-{
- char tmpfile[PATH_MAX];
- int local;
- z_stream stream;
- unsigned char real_sha1[20];
- unsigned char discard[4096];
- int ret;
- SHA_CTX c;
-
- snprintf(tmpfile, sizeof(tmpfile), "%s/tmp_obj_XXXXXX", get_object_directory());
-
- local = mkstemp(tmpfile);
- if (local < 0) {
- if (errno == EPERM)
- return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
- else
- return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
- }
-
- memset(&stream, 0, sizeof(stream));
-
- inflateInit(&stream);
-
- SHA1_Init(&c);
-
- do {
- ssize_t size;
- 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);
- 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;
- if (ret != Z_OK)
- break;
- }
- size = xread(fd, buffer + *bufposn, bufsize - *bufposn);
- if (size <= 0) {
- close(local);
- unlink(tmpfile);
- if (!size)
- return error("Connection closed?");
- perror("Reading from connection");
- return -1;
- }
- *bufposn += size;
- } while (1);
- inflateEnd(&stream);
-
- fchmod(local, 0444);
- if (close(local) != 0)
- die("unable to write sha1 file");
- SHA1_Final(real_sha1, &c);
- if (ret != Z_STREAM_END) {
- unlink(tmpfile);
- return error("File %s corrupted", sha1_to_hex(sha1));
- }
- if (hashcmp(sha1, real_sha1)) {
- unlink(tmpfile);
- return error("File %s has bad hash", sha1_to_hex(sha1));
- }
-
- return move_temp_to_file(tmpfile, sha1_file_name(sha1));
-}
-
int has_pack_index(const unsigned char *sha1)
{
struct stat st;
int has_sha1_file(const unsigned char *sha1)
{
- struct stat st;
struct pack_entry e;
if (find_pack_entry(sha1, &e, NULL))
return 1;
- return find_sha1_file(sha1, &st) ? 1 : 0;
+ return has_loose_object(sha1);
}
int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object)