-
-/* Copy contents of buffer to out_fd and keep out_offset correct. */
-static void
-write_to_fd (const void *buffer, size_t len)
-{
- if (full_write (out_fd, buffer, len) != len)
- error (EXIT_FAILURE, errno, "write");
- out_offset += len;
-}
-
-/* Copy contents of file to out_fd. */
-static void
-write_file_to_fd (const char *filename)
-{
- char buffer[BUFFER_SIZE];
- int fd2;
- ssize_t r;
-
- if (verbose >= 2)
- fprintf (stderr, "write_file_to_fd %s -> %d\n", filename, out_fd);
-
- fd2 = open (filename, O_RDONLY);
- if (fd2 == -1)
- error (EXIT_FAILURE, errno, "open: %s", filename);
- for (;;) {
- r = read (fd2, buffer, sizeof buffer);
- if (r == 0)
- break;
- if (r == -1) {
- if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR)
- continue;
- error (EXIT_FAILURE, errno, "read: %s", filename);
- }
- write_to_fd (buffer, r);
- }
-
- if (close (fd2) == -1)
- error (EXIT_FAILURE, errno, "close: %s", filename);
-}
-
-/* Copy file of given length to output, and fail if the file has
- * changed size.
- */
-static void
-write_file_len_to_fd (const char *filename, size_t len)
-{
- char buffer[BUFFER_SIZE];
- size_t count = 0;
-
- if (verbose >= 2)
- fprintf (stderr, "write_file_to_fd %s -> %d\n", filename, out_fd);
-
- int fd2 = open (filename, O_RDONLY);
- if (fd2 == -1)
- error (EXIT_FAILURE, errno, "open: %s", filename);
- for (;;) {
- ssize_t r = read (fd2, buffer, sizeof buffer);
- if (r == 0)
- break;
- if (r == -1) {
- if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR)
- continue;
- error (EXIT_FAILURE, errno, "read: %s", filename);
- }
- write_to_fd (buffer, r);
- count += r;
- if (count > len)
- error (EXIT_FAILURE, 0, "write_file_len_to_fd: %s: file has increased in size\n", filename);
- }
-
- if (close (fd2) == -1)
- error (EXIT_FAILURE, errno, "close: %s", filename);
-
- if (count != len)
- error (EXIT_FAILURE, 0, "febootstrap-supermin-helper: write_file_len_to_fd: %s: file has changed size\n", filename);
-}
-
-/* Append the file pointed to by FTSENT to the cpio output. */
-static void
-cpio_append_fts_entry (FTSENT *entry)
-{
- if (entry->fts_info & FTS_NS || entry->fts_info & FTS_NSOK)
- cpio_append (entry->fts_path);
- else
- cpio_append_stat (entry->fts_path, entry->fts_statp);
-}
-
-/* Append the file named 'filename' to the cpio output. */
-static void
-cpio_append (const char *filename)
-{
- struct stat statbuf;
-
- if (lstat (filename, &statbuf) == -1)
- error (EXIT_FAILURE, errno, "lstat: %s", filename);
- cpio_append_stat (filename, &statbuf);
-}
-
-/* Append the file to the cpio output. */
-#define PADDING(len) ((((len) + 3) & ~3) - (len))
-
-#define CPIO_HEADER_LEN (6 + 13*8)
-
-static void
-cpio_append_stat (const char *filename, struct stat *statbuf)
-{
- const char *orig_filename = filename;
-
- if (*filename == '/')
- filename++;
- if (*filename == '\0')
- filename = ".";
-
- if (verbose >= 2)
- fprintf (stderr, "cpio_append_stat %s 0%o -> %d\n",
- orig_filename, statbuf->st_mode, out_fd);
-
- /* Regular files and symlinks are the only ones that have a "body"
- * in this cpio entry.
- */
- int has_body = S_ISREG (statbuf->st_mode) || S_ISLNK (statbuf->st_mode);
-
- size_t len = strlen (filename) + 1;
-
- char header[CPIO_HEADER_LEN + 1];
- snprintf (header, sizeof header,
- "070701" /* magic */
- "%08X" /* inode */
- "%08X" /* mode */
- "%08X" "%08X" /* uid, gid */
- "%08X" /* nlink */
- "%08X" /* mtime */
- "%08X" /* file length */
- "%08X" "%08X" /* device holding file major, minor */
- "%08X" "%08X" /* for specials, device major, minor */
- "%08X" /* name length (including \0 byte) */
- "%08X", /* checksum (not used by the kernel) */
- (unsigned) statbuf->st_ino, statbuf->st_mode,
- statbuf->st_uid, statbuf->st_gid,
- (unsigned) statbuf->st_nlink, (unsigned) statbuf->st_mtime,
- has_body ? (unsigned) statbuf->st_size : 0,
- major (statbuf->st_dev), minor (statbuf->st_dev),
- major (statbuf->st_rdev), minor (statbuf->st_rdev),
- (unsigned) len, 0);
-
- /* Write the header. */
- write_to_fd (header, CPIO_HEADER_LEN);
-
- /* Follow with the filename, and pad it. */
- write_to_fd (filename, len);
- size_t padding_len = PADDING (CPIO_HEADER_LEN + len);
- write_padding (padding_len);
-
- /* Follow with the file or symlink content, and pad it. */
- if (has_body) {
- if (S_ISREG (statbuf->st_mode))
- write_file_len_to_fd (orig_filename, statbuf->st_size);
- else if (S_ISLNK (statbuf->st_mode)) {
- char tmp[PATH_MAX];
- if (readlink (orig_filename, tmp, sizeof tmp) == -1)
- error (EXIT_FAILURE, errno, "readlink: %s", orig_filename);
- write_to_fd (tmp, statbuf->st_size);
- }
-
- padding_len = PADDING (statbuf->st_size);
- write_padding (padding_len);
- }
-}
-
-/* CPIO voodoo. */
-static void
-cpio_append_trailer (void)
-{
- struct stat statbuf;
- memset (&statbuf, 0, sizeof statbuf);
- statbuf.st_nlink = 1;
- cpio_append_stat ("TRAILER!!!", &statbuf);
-
- /* CPIO seems to pad up to the next block boundary, ie. up to
- * the next 512 bytes.
- */
- write_padding (((out_offset + 511) & ~511) - out_offset);
- assert ((out_offset & 511) == 0);
-}
-
-/* Write 'len' bytes of zeroes out. */
-static void
-write_padding (size_t len)
-{
- static const char buffer[512] = { 0 };
-
- while (len > 0) {
- size_t n = len < sizeof buffer ? len : sizeof buffer;
- write_to_fd (buffer, n);
- len -= n;
- }
-}