#include "system.h"
#include <signal.h>
#if MSDOS
# include <process.h>
#endif
#if XENIX
# include <sys/inode.h>
#endif
#include <fnmatch.h>
#include <human.h>
#include <quotearg.h>
#include "common.h"
#include "rmt.h"
#define PREAD 0
#define PWRITE 1
#define READ_ERROR_MAX 10
#define VOLUME_LABEL_APPEND " Volume [1-9]*"
static tarlong prev_written;
static tarlong bytes_written;
union block *record_start;
union block *record_end;
union block *current_block;
enum access_mode access_mode;
off_t records_read;
off_t records_written;
static struct stat archive_stat;
static off_t record_start_block;
FILE *stdlis;
static void backspace_output PARAMS ((void));
static int new_volume PARAMS ((enum access_mode));
static void archive_write_error PARAMS ((ssize_t)) __attribute__ ((noreturn));
static void archive_read_error PARAMS ((void));
#if !MSDOS
dev_t ar_dev;
ino_t ar_ino;
#endif
static pid_t child_pid;
static int read_error_count;
static int hit_eof;
static int checkpoint;
extern int time_to_start_writing;
int file_to_switch_to = -1;
static int volno = 1;
static int global_volno = 1;
char *save_name;
off_t save_totsize;
off_t save_sizeleft;
bool write_archive_to_stdout;
static char *real_s_name;
static off_t real_s_totsize;
static off_t real_s_sizeleft;
void
print_total_written (void)
{
tarlong written = prev_written + bytes_written;
char bytes[sizeof (tarlong) * CHAR_BIT];
char abbr[LONGEST_HUMAN_READABLE + 1];
char rate[LONGEST_HUMAN_READABLE + 1];
double seconds;
#if HAVE_CLOCK_GETTIME
struct timespec now;
if (clock_gettime (CLOCK_REALTIME, &now) == 0)
seconds = ((now.tv_sec - start_timespec.tv_sec)
+ (now.tv_nsec - start_timespec.tv_nsec) / 1e9);
else
#endif
seconds = time (0) - start_time;
sprintf (bytes, TARLONG_FORMAT, written);
fprintf (stderr, _("Total bytes written: %s (%sB, %sB/s)\n"), bytes,
human_readable ((uintmax_t) written, abbr, 1, -1024),
(0 < seconds && written / seconds < (uintmax_t) -1
? human_readable ((uintmax_t) (written / seconds), rate, 1, -1024)
: "?"));
}
off_t
current_block_ordinal (void)
{
return record_start_block + (current_block - record_start);
}
void
reset_eof (void)
{
if (hit_eof)
{
hit_eof = 0;
current_block = record_start;
record_end = record_start + blocking_factor;
access_mode = ACCESS_WRITE;
}
}
union block *
find_next_block (void)
{
if (current_block == record_end)
{
if (hit_eof)
return 0;
flush_archive ();
if (current_block == record_end)
{
hit_eof = 1;
return 0;
}
}
return current_block;
}
void
set_next_block_after (union block *block)
{
while (block >= current_block)
current_block++;
if (current_block > record_end)
abort ();
}
size_t
available_space_after (union block *pointer)
{
return record_end->buffer - pointer->buffer;
}
static void
xclose (int fd)
{
if (close (fd) != 0)
close_error (_("(pipe)"));
}
static void
xdup2 (int from, int into)
{
if (from != into)
{
int status = close (into);
if (status != 0 && errno != EBADF)
{
int e = errno;
FATAL_ERROR ((0, e, _("Cannot close")));
}
status = dup (from);
if (status != into)
{
if (status < 0)
{
int e = errno;
FATAL_ERROR ((0, e, _("Cannot dup")));
}
abort ();
}
xclose (from);
}
}
#if MSDOS
static void
child_open_for_compress (void)
{
FATAL_ERROR ((0, 0, _("Cannot use compressed or remote archives")));
}
static void
child_open_for_uncompress (void)
{
FATAL_ERROR ((0, 0, _("Cannot use compressed or remote archives")));
}
#else
static int
is_regular_file (const char *name)
{
struct stat stbuf;
if (stat (name, &stbuf) == 0)
return S_ISREG (stbuf.st_mode);
else
return errno == ENOENT;
}
static ssize_t
write_archive_buffer (void)
{
ssize_t status;
ssize_t written = 0;
while (0 <= (status = rmtwrite (archive, record_start->buffer + written,
record_size - written)))
{
written += status;
if (written == record_size
|| _isrmt (archive)
|| ! (S_ISFIFO (archive_stat.st_mode)
|| S_ISSOCK (archive_stat.st_mode)))
break;
}
return written ? written : status;
}
static void
child_open_for_compress (void)
{
int parent_pipe[2];
int child_pipe[2];
pid_t grandchild_pid;
int wait_status;
xpipe (parent_pipe);
child_pid = xfork ();
if (child_pid > 0)
{
archive = parent_pipe[PWRITE];
xclose (parent_pipe[PREAD]);
return;
}
program_name = _("tar (child)");
xdup2 (parent_pipe[PREAD], STDIN_FILENO);
xclose (parent_pipe[PWRITE]);
if (strcmp (archive_name_array[0], "-") != 0
&& !_remdev (archive_name_array[0])
&& is_regular_file (archive_name_array[0]))
{
if (backup_option)
maybe_backup_file (archive_name_array[0], 1);
archive = creat (archive_name_array[0], MODE_RW);
if (archive < 0)
{
int saved_errno = errno;
if (backup_option)
undo_last_backup ();
errno = saved_errno;
open_fatal (archive_name_array[0]);
}
xdup2 (archive, STDOUT_FILENO);
execlp (use_compress_program_option, use_compress_program_option,
(char *) 0);
exec_fatal (use_compress_program_option);
}
xpipe (child_pipe);
grandchild_pid = xfork ();
if (grandchild_pid == 0)
{
program_name = _("tar (grandchild)");
xdup2 (child_pipe[PWRITE], STDOUT_FILENO);
xclose (child_pipe[PREAD]);
execlp (use_compress_program_option, use_compress_program_option,
(char *) 0);
exec_fatal (use_compress_program_option);
}
xdup2 (child_pipe[PREAD], STDIN_FILENO);
xclose (child_pipe[PWRITE]);
if (strcmp (archive_name_array[0], "-") == 0)
archive = STDOUT_FILENO;
else
{
archive = rmtcreat (archive_name_array[0], MODE_RW, rsh_command_option);
if (archive < 0)
open_fatal (archive_name_array[0]);
}
while (1)
{
ssize_t status = 0;
char *cursor;
size_t length;
for (length = 0, cursor = record_start->buffer;
length < record_size;
length += status, cursor += status)
{
size_t size = record_size - length;
if (size < BLOCKSIZE)
size = BLOCKSIZE;
status = safe_read (STDIN_FILENO, cursor, size);
if (status <= 0)
break;
}
if (status < 0)
read_fatal (use_compress_program_option);
if (status == 0)
{
if (length > 0)
{
memset (record_start->buffer + length, 0, record_size - length);
status = write_archive_buffer ();
if (status != record_size)
archive_write_error (status);
}
break;
}
status = write_archive_buffer ();
if (status != record_size)
archive_write_error (status);
}
#if 0
close_archive ();
#endif
while (waitpid (grandchild_pid, &wait_status, 0) == -1)
if (errno != EINTR)
{
waitpid_error (use_compress_program_option);
break;
}
if (WIFSIGNALED (wait_status))
{
kill (child_pid, WTERMSIG (wait_status));
exit_status = TAREXIT_FAILURE;
}
else if (WEXITSTATUS (wait_status) != 0)
exit_status = WEXITSTATUS (wait_status);
exit (exit_status);
}
static void
child_open_for_uncompress (void)
{
int parent_pipe[2];
int child_pipe[2];
pid_t grandchild_pid;
int wait_status;
xpipe (parent_pipe);
child_pid = xfork ();
if (child_pid > 0)
{
read_full_records_option = 1;
archive = parent_pipe[PREAD];
xclose (parent_pipe[PWRITE]);
return;
}
program_name = _("tar (child)");
xdup2 (parent_pipe[PWRITE], STDOUT_FILENO);
xclose (parent_pipe[PREAD]);
if (strcmp (archive_name_array[0], "-") != 0
&& !_remdev (archive_name_array[0])
&& is_regular_file (archive_name_array[0]))
{
archive = open (archive_name_array[0], O_RDONLY | O_BINARY, MODE_RW);
if (archive < 0)
open_fatal (archive_name_array[0]);
xdup2 (archive, STDIN_FILENO);
execlp (use_compress_program_option, use_compress_program_option,
"-d", (char *) 0);
exec_fatal (use_compress_program_option);
}
xpipe (child_pipe);
grandchild_pid = xfork ();
if (grandchild_pid == 0)
{
program_name = _("tar (grandchild)");
xdup2 (child_pipe[PREAD], STDIN_FILENO);
xclose (child_pipe[PWRITE]);
execlp (use_compress_program_option, use_compress_program_option,
"-d", (char *) 0);
exec_fatal (use_compress_program_option);
}
xdup2 (child_pipe[PWRITE], STDOUT_FILENO);
xclose (child_pipe[PREAD]);
if (strcmp (archive_name_array[0], "-") == 0)
archive = STDIN_FILENO;
else
archive = rmtopen (archive_name_array[0], O_RDONLY | O_BINARY,
MODE_RW, rsh_command_option);
if (archive < 0)
open_fatal (archive_name_array[0]);
while (1)
{
char *cursor;
size_t maximum;
size_t count;
ssize_t status;
read_error_count = 0;
error_loop:
status = rmtread (archive, record_start->buffer, record_size);
if (status < 0)
{
archive_read_error ();
goto error_loop;
}
if (status == 0)
break;
cursor = record_start->buffer;
maximum = status;
while (maximum)
{
count = maximum < BLOCKSIZE ? maximum : BLOCKSIZE;
if (full_write (STDOUT_FILENO, cursor, count) != count)
write_error (use_compress_program_option);
cursor += count;
maximum -= count;
}
}
xclose (STDOUT_FILENO);
#if 0
close_archive ();
#endif
while (waitpid (grandchild_pid, &wait_status, 0) == -1)
if (errno != EINTR)
{
waitpid_error (use_compress_program_option);
break;
}
if (WIFSIGNALED (wait_status))
{
kill (child_pid, WTERMSIG (wait_status));
exit_status = TAREXIT_FAILURE;
}
else if (WEXITSTATUS (wait_status) != 0)
exit_status = WEXITSTATUS (wait_status);
exit (exit_status);
}
#endif
static int
check_label_pattern (union block *label)
{
char *string;
int result;
if (! memchr (label->header.name, '\0', sizeof label->header.name))
return 0;
if (fnmatch (volume_label_option, label->header.name, 0) == 0)
return 1;
if (!multi_volume_option)
return 0;
string = xmalloc (strlen (volume_label_option)
+ sizeof VOLUME_LABEL_APPEND + 1);
strcpy (string, volume_label_option);
strcat (string, VOLUME_LABEL_APPEND);
result = fnmatch (string, label->header.name, 0) == 0;
free (string);
return result;
}
void
open_archive (enum access_mode wanted_access)
{
int backed_up_flag = 0;
stdlis = to_stdout_option ? stderr : stdout;
if (record_size == 0)
FATAL_ERROR ((0, 0, _("Invalid value for record_size")));
if (archive_names == 0)
FATAL_ERROR ((0, 0, _("No archive name given")));
current_file_name = 0;
current_link_name = 0;
save_name = 0;
real_s_name = 0;
if (multi_volume_option)
{
if (verify_option)
FATAL_ERROR ((0, 0, _("Cannot verify multi-volume archives")));
record_start = valloc (record_size + (2 * BLOCKSIZE));
if (record_start)
record_start += 2;
}
else
record_start = valloc (record_size);
if (!record_start)
FATAL_ERROR ((0, 0, _("Cannot allocate memory for blocking factor %d"),
blocking_factor));
current_block = record_start;
record_end = record_start + blocking_factor;
access_mode = wanted_access == ACCESS_UPDATE ? ACCESS_READ : wanted_access;
if (use_compress_program_option)
{
if (multi_volume_option)
FATAL_ERROR ((0, 0, _("Cannot use multi-volume compressed archives")));
if (verify_option)
FATAL_ERROR ((0, 0, _("Cannot verify compressed archives")));
switch (wanted_access)
{
case ACCESS_READ:
child_open_for_uncompress ();
break;
case ACCESS_WRITE:
child_open_for_compress ();
break;
case ACCESS_UPDATE:
FATAL_ERROR ((0, 0, _("Cannot update compressed archives")));
break;
}
if (wanted_access == ACCESS_WRITE
&& strcmp (archive_name_array[0], "-") == 0)
stdlis = stderr;
}
else if (strcmp (archive_name_array[0], "-") == 0)
{
read_full_records_option = 1;
if (verify_option)
FATAL_ERROR ((0, 0, _("Cannot verify stdin/stdout archive")));
switch (wanted_access)
{
case ACCESS_READ:
archive = STDIN_FILENO;
break;
case ACCESS_WRITE:
archive = STDOUT_FILENO;
stdlis = stderr;
break;
case ACCESS_UPDATE:
archive = STDIN_FILENO;
stdlis = stderr;
write_archive_to_stdout = 1;
break;
}
}
else if (verify_option)
archive = rmtopen (archive_name_array[0], O_RDWR | O_CREAT | O_BINARY,
MODE_RW, rsh_command_option);
else
switch (wanted_access)
{
case ACCESS_READ:
archive = rmtopen (archive_name_array[0], O_RDONLY | O_BINARY,
MODE_RW, rsh_command_option);
break;
case ACCESS_WRITE:
if (backup_option)
{
maybe_backup_file (archive_name_array[0], 1);
backed_up_flag = 1;
}
archive = rmtcreat (archive_name_array[0], MODE_RW,
rsh_command_option);
break;
case ACCESS_UPDATE:
archive = rmtopen (archive_name_array[0], O_RDWR | O_CREAT | O_BINARY,
MODE_RW, rsh_command_option);
break;
}
if (archive < 0
|| (! _isrmt (archive) && fstat (archive, &archive_stat) < 0))
{
int saved_errno = errno;
if (backed_up_flag)
undo_last_backup ();
errno = saved_errno;
open_fatal (archive_name_array[0]);
}
#if !MSDOS
{
static char const dev_null[] = "/dev/null";
struct stat dev_null_stat;
dev_null_output =
(strcmp (archive_name_array[0], dev_null) == 0
|| (! _isrmt (archive)
&& S_ISCHR (archive_stat.st_mode)
&& stat (dev_null, &dev_null_stat) == 0
&& archive_stat.st_dev == dev_null_stat.st_dev
&& archive_stat.st_ino == dev_null_stat.st_ino));
}
if (!_isrmt (archive) && S_ISREG (archive_stat.st_mode))
{
ar_dev = archive_stat.st_dev;
ar_ino = archive_stat.st_ino;
}
else
ar_dev = 0;
#endif
#if MSDOS
setmode (archive, O_BINARY);
#endif
switch (wanted_access)
{
case ACCESS_UPDATE:
records_written = 0;
case ACCESS_READ:
records_read = 0;
record_end = record_start;
find_next_block ();
if (volume_label_option)
{
union block *label = find_next_block ();
if (!label)
FATAL_ERROR ((0, 0, _("Archive not labeled to match %s"),
quote (volume_label_option)));
if (!check_label_pattern (label))
FATAL_ERROR ((0, 0, _("Volume %s does not match %s"),
quote_n (0, label->header.name),
quote_n (1, volume_label_option)));
}
break;
case ACCESS_WRITE:
records_written = 0;
if (volume_label_option)
{
memset (record_start, 0, BLOCKSIZE);
if (multi_volume_option)
sprintf (record_start->header.name, "%s Volume 1",
volume_label_option);
else
strcpy (record_start->header.name, volume_label_option);
assign_string (¤t_file_name, record_start->header.name);
record_start->header.typeflag = GNUTYPE_VOLHDR;
TIME_TO_CHARS (start_time, record_start->header.mtime);
finish_header (record_start);
#if 0
current_block++;
#endif
}
break;
}
}
void
flush_write (void)
{
int copy_back;
ssize_t status;
if (checkpoint_option && !(++checkpoint % 10))
WARN ((0, 0, _("Write checkpoint %d"), checkpoint));
if (tape_length_option && tape_length_option <= bytes_written)
{
errno = ENOSPC;
status = 0;
}
else if (dev_null_output)
status = record_size;
else
status = write_archive_buffer ();
if (status != record_size && !multi_volume_option)
archive_write_error (status);
if (status > 0)
{
records_written++;
bytes_written += status;
}
if (status == record_size)
{
if (multi_volume_option)
{
char *cursor;
if (!save_name)
{
assign_string (&real_s_name, 0);
real_s_totsize = 0;
real_s_sizeleft = 0;
return;
}
cursor = save_name + FILESYSTEM_PREFIX_LEN (save_name);
while (ISSLASH (*cursor))
cursor++;
assign_string (&real_s_name, cursor);
real_s_totsize = save_totsize;
real_s_sizeleft = save_sizeleft;
}
return;
}
if (status < 0 && errno != ENOSPC && errno != EIO && errno != ENXIO)
archive_write_error (status);
if (!new_volume (ACCESS_WRITE))
return;
if (totals_option)
prev_written += bytes_written;
bytes_written = 0;
if (volume_label_option && real_s_name)
{
copy_back = 2;
record_start -= 2;
}
else if (volume_label_option || real_s_name)
{
copy_back = 1;
record_start--;
}
else
copy_back = 0;
if (volume_label_option)
{
memset (record_start, 0, BLOCKSIZE);
sprintf (record_start->header.name, "%s Volume %d",
volume_label_option, volno);
TIME_TO_CHARS (start_time, record_start->header.mtime);
record_start->header.typeflag = GNUTYPE_VOLHDR;
finish_header (record_start);
}
if (real_s_name)
{
int tmp;
if (volume_label_option)
record_start++;
memset (record_start, 0, BLOCKSIZE);
strcpy (record_start->header.name, real_s_name);
record_start->header.typeflag = GNUTYPE_MULTIVOL;
OFF_TO_CHARS (real_s_sizeleft, record_start->header.size);
OFF_TO_CHARS (real_s_totsize - real_s_sizeleft,
record_start->oldgnu_header.offset);
tmp = verbose_option;
verbose_option = 0;
finish_header (record_start);
verbose_option = tmp;
if (volume_label_option)
record_start--;
}
status = write_archive_buffer ();
if (status != record_size)
archive_write_error (status);
bytes_written += status;
if (copy_back)
{
record_start += copy_back;
memcpy (current_block,
record_start + blocking_factor - copy_back,
copy_back * BLOCKSIZE);
current_block += copy_back;
if (real_s_sizeleft >= copy_back * BLOCKSIZE)
real_s_sizeleft -= copy_back * BLOCKSIZE;
else if ((real_s_sizeleft + BLOCKSIZE - 1) / BLOCKSIZE <= copy_back)
assign_string (&real_s_name, 0);
else
{
char *cursor = save_name + FILESYSTEM_PREFIX_LEN (save_name);
while (ISSLASH (*cursor))
cursor++;
assign_string (&real_s_name, cursor);
real_s_sizeleft = save_sizeleft;
real_s_totsize = save_totsize;
}
copy_back = 0;
}
}
static void
archive_write_error (ssize_t status)
{
if (totals_option)
{
int e = errno;
print_total_written ();
errno = e;
}
write_fatal_details (*archive_name_cursor, status, record_size);
}
static void
archive_read_error (void)
{
read_error (*archive_name_cursor);
if (record_start_block == 0)
FATAL_ERROR ((0, 0, _("At beginning of tape, quitting now")));
if (read_error_count++ > READ_ERROR_MAX)
FATAL_ERROR ((0, 0, _("Too many errors, quitting")));
return;
}
void
flush_read (void)
{
ssize_t status;
size_t left;
char *more;
if (checkpoint_option && !(++checkpoint % 10))
WARN ((0, 0, _("Read checkpoint %d"), checkpoint));
read_error_count = 0;
if (write_archive_to_stdout && record_start_block != 0)
{
archive = STDOUT_FILENO;
status = write_archive_buffer ();
archive = STDIN_FILENO;
if (status != record_size)
archive_write_error (status);
}
if (multi_volume_option)
{
if (save_name)
{
char *cursor = save_name + FILESYSTEM_PREFIX_LEN (save_name);
while (ISSLASH (*cursor))
cursor++;
assign_string (&real_s_name, cursor);
real_s_sizeleft = save_sizeleft;
real_s_totsize = save_totsize;
}
else
{
assign_string (&real_s_name, 0);
real_s_totsize = 0;
real_s_sizeleft = 0;
}
}
error_loop:
status = rmtread (archive, record_start->buffer, record_size);
if (status == record_size)
{
records_read++;
return;
}
if ((status == 0
|| (status < 0 && errno == ENOSPC)
|| (status > 0 && !read_full_records_option))
&& multi_volume_option)
{
union block *cursor;
try_volume:
switch (subcommand_option)
{
case APPEND_SUBCOMMAND:
case CAT_SUBCOMMAND:
case UPDATE_SUBCOMMAND:
if (!new_volume (ACCESS_UPDATE))
return;
break;
default:
if (!new_volume (ACCESS_READ))
return;
break;
}
vol_error:
status = rmtread (archive, record_start->buffer, record_size);
if (status < 0)
{
archive_read_error ();
goto vol_error;
}
if (status != record_size)
goto short_read;
cursor = record_start;
if (cursor->header.typeflag == GNUTYPE_VOLHDR)
{
if (volume_label_option)
{
if (!check_label_pattern (cursor))
{
WARN ((0, 0, _("Volume %s does not match %s"),
quote_n (0, cursor->header.name),
quote_n (1, volume_label_option)));
volno--;
global_volno--;
goto try_volume;
}
}
if (verbose_option)
fprintf (stdlis, _("Reading %s\n"), quote (cursor->header.name));
cursor++;
}
else if (volume_label_option)
WARN ((0, 0, _("WARNING: No volume header")));
if (real_s_name)
{
uintmax_t s1, s2;
if (cursor->header.typeflag != GNUTYPE_MULTIVOL
|| strcmp (cursor->header.name, real_s_name))
{
WARN ((0, 0, _("%s is not continued on this volume"),
quote (real_s_name)));
volno--;
global_volno--;
goto try_volume;
}
s1 = UINTMAX_FROM_HEADER (cursor->header.size);
s2 = UINTMAX_FROM_HEADER (cursor->oldgnu_header.offset);
if (real_s_totsize != s1 + s2 || s1 + s2 < s2)
{
char totsizebuf[UINTMAX_STRSIZE_BOUND];
char s1buf[UINTMAX_STRSIZE_BOUND];
char s2buf[UINTMAX_STRSIZE_BOUND];
WARN ((0, 0, _("%s is the wrong size (%s != %s + %s)"),
quote (cursor->header.name),
STRINGIFY_BIGINT (save_totsize, totsizebuf),
STRINGIFY_BIGINT (s1, s1buf),
STRINGIFY_BIGINT (s2, s2buf)));
volno--;
global_volno--;
goto try_volume;
}
if (real_s_totsize - real_s_sizeleft
!= OFF_FROM_HEADER (cursor->oldgnu_header.offset))
{
WARN ((0, 0, _("This volume is out of sequence")));
volno--;
global_volno--;
goto try_volume;
}
cursor++;
}
current_block = cursor;
records_read++;
return;
}
else if (status < 0)
{
archive_read_error ();
goto error_loop;
}
short_read:
more = record_start->buffer + status;
left = record_size - status;
while (left % BLOCKSIZE != 0
|| (left && status && read_full_records_option))
{
if (status)
while ((status = rmtread (archive, more, left)) < 0)
archive_read_error ();
if (status == 0)
break;
if (! read_full_records_option)
FATAL_ERROR ((0, 0, _("Unaligned block (%lu bytes) in archive"),
(unsigned long) (record_size - left)));
left -= status;
more += status;
}
if (!read_full_records_option && verbose_option
&& record_start_block == 0 && status > 0)
WARN ((0, 0, _("Record size = %lu blocks"),
(unsigned long) ((record_size - left) / BLOCKSIZE)));
record_end = record_start + (record_size - left) / BLOCKSIZE;
records_read++;
}
void
flush_archive (void)
{
record_start_block += record_end - record_start;
current_block = record_start;
record_end = record_start + blocking_factor;
if (access_mode == ACCESS_READ && time_to_start_writing)
{
access_mode = ACCESS_WRITE;
time_to_start_writing = 0;
if (file_to_switch_to >= 0)
{
if (rmtclose (archive) != 0)
close_warn (*archive_name_cursor);
archive = file_to_switch_to;
}
else
backspace_output ();
}
switch (access_mode)
{
case ACCESS_READ:
flush_read ();
break;
case ACCESS_WRITE:
flush_write ();
break;
case ACCESS_UPDATE:
abort ();
}
}
static void
backspace_output (void)
{
#ifdef MTIOCTOP
{
struct mtop operation;
operation.mt_op = MTBSR;
operation.mt_count = 1;
if (rmtioctl (archive, MTIOCTOP, (char *) &operation) >= 0)
return;
if (errno == EIO && rmtioctl (archive, MTIOCTOP, (char *) &operation) >= 0)
return;
}
#endif
{
off_t position = rmtlseek (archive, (off_t) 0, SEEK_CUR);
position -= record_size;
if (position < 0)
position = 0;
if (rmtlseek (archive, position, SEEK_SET) != position)
{
WARN ((0, 0,
_("Cannot backspace archive file; it may be unreadable without -i")));
if (record_start->buffer != output_start)
memset (record_start->buffer, 0,
output_start - record_start->buffer);
}
}
}
void
close_archive (void)
{
if (time_to_start_writing || access_mode == ACCESS_WRITE)
flush_archive ();
#if !MSDOS
if (access_mode == ACCESS_READ
&& ! _isrmt (archive)
&& (S_ISFIFO (archive_stat.st_mode) || S_ISSOCK (archive_stat.st_mode)))
while (rmtread (archive, record_start->buffer, record_size) > 0)
continue;
#endif
if (verify_option)
verify_volume ();
if (rmtclose (archive) != 0)
close_warn (*archive_name_cursor);
#if !MSDOS
if (child_pid)
{
int wait_status;
while (waitpid (child_pid, &wait_status, 0) == -1)
if (errno != EINTR)
{
waitpid_error (use_compress_program_option);
break;
}
if (WIFSIGNALED (wait_status))
ERROR ((0, 0, _("Child died with signal %d"),
WTERMSIG (wait_status)));
else if (WEXITSTATUS (wait_status) != 0)
ERROR ((0, 0, _("Child returned status %d"),
WEXITSTATUS (wait_status)));
}
#endif
if (current_file_name)
free (current_file_name);
if (current_link_name)
free (current_link_name);
if (save_name)
free (save_name);
if (real_s_name)
free (real_s_name);
free (multi_volume_option ? record_start - 2 : record_start);
}
void
init_volume_number (void)
{
FILE *file = fopen (volno_file_option, "r");
if (file)
{
if (fscanf (file, "%d", &global_volno) != 1
|| global_volno < 0)
FATAL_ERROR ((0, 0, _("%s: contains invalid volume number"),
quotearg_colon (volno_file_option)));
if (ferror (file))
read_error (volno_file_option);
if (fclose (file) != 0)
close_error (volno_file_option);
}
else if (errno != ENOENT)
open_error (volno_file_option);
}
void
closeout_volume_number (void)
{
FILE *file = fopen (volno_file_option, "w");
if (file)
{
fprintf (file, "%d\n", global_volno);
if (ferror (file))
write_error (volno_file_option);
if (fclose (file) != 0)
close_error (volno_file_option);
}
else
open_error (volno_file_option);
}
static int
new_volume (enum access_mode access)
{
static FILE *read_file;
static int looped;
if (!read_file && !info_script_option)
read_file = archive == STDIN_FILENO ? fopen (TTY_NAME, "r") : stdin;
if (now_verifying)
return 0;
if (verify_option)
verify_volume ();
if (rmtclose (archive) != 0)
close_warn (*archive_name_cursor);
global_volno++;
if (global_volno < 0)
FATAL_ERROR ((0, 0, _("Volume number overflow")));
volno++;
archive_name_cursor++;
if (archive_name_cursor == archive_name_array + archive_names)
{
archive_name_cursor = archive_name_array;
looped = 1;
}
tryagain:
if (looped)
{
if (info_script_option)
{
if (volno_file_option)
closeout_volume_number ();
if (system (info_script_option) != 0)
FATAL_ERROR ((0, 0, _("`%s' command failed"), info_script_option));
}
else
while (1)
{
char input_buffer[80];
fputc ('\007', stderr);
fprintf (stderr,
_("Prepare volume #%d for %s and hit return: "),
global_volno, quote (*archive_name_cursor));
fflush (stderr);
if (fgets (input_buffer, sizeof input_buffer, read_file) == 0)
{
WARN ((0, 0, _("EOF where user reply was expected")));
if (subcommand_option != EXTRACT_SUBCOMMAND
&& subcommand_option != LIST_SUBCOMMAND
&& subcommand_option != DIFF_SUBCOMMAND)
WARN ((0, 0, _("WARNING: Archive is incomplete")));
fatal_exit ();
}
if (input_buffer[0] == '\n'
|| input_buffer[0] == 'y'
|| input_buffer[0] == 'Y')
break;
switch (input_buffer[0])
{
case '?':
{
fprintf (stderr, _("\
n [name] Give a new file name for the next (and subsequent) volume(s)\n\
q Abort tar\n\
! Spawn a subshell\n\
? Print this list\n"));
}
break;
case 'q':
WARN ((0, 0, _("No new volume; exiting.\n")));
if (subcommand_option != EXTRACT_SUBCOMMAND
&& subcommand_option != LIST_SUBCOMMAND
&& subcommand_option != DIFF_SUBCOMMAND)
WARN ((0, 0, _("WARNING: Archive is incomplete")));
fatal_exit ();
case 'n':
{
char *name = &input_buffer[1];
char *cursor;
while (*name == ' ' || *name == '\t')
name++;
cursor = name;
while (*cursor && *cursor != '\n')
cursor++;
*cursor = '\0';
*archive_name_cursor = xstrdup (name);
}
break;
case '!':
#if MSDOS
spawnl (P_WAIT, getenv ("COMSPEC"), "-", 0);
#else
{
pid_t child;
const char *shell = getenv ("SHELL");
if (! shell)
shell = "/bin/sh";
child = xfork ();
if (child == 0)
{
execlp (shell, "-sh", "-i", 0);
exec_fatal (shell);
}
else
{
int wait_status;
while (waitpid (child, &wait_status, 0) == -1)
if (errno != EINTR)
{
waitpid_error (shell);
break;
}
}
}
#endif
break;
}
}
}
if (verify_option)
archive = rmtopen (*archive_name_cursor, O_RDWR | O_CREAT, MODE_RW,
rsh_command_option);
else
switch (access)
{
case ACCESS_READ:
archive = rmtopen (*archive_name_cursor, O_RDONLY, MODE_RW,
rsh_command_option);
break;
case ACCESS_WRITE:
if (backup_option)
maybe_backup_file (*archive_name_cursor, 1);
archive = rmtcreat (*archive_name_cursor, MODE_RW,
rsh_command_option);
break;
case ACCESS_UPDATE:
archive = rmtopen (*archive_name_cursor, O_RDWR | O_CREAT, MODE_RW,
rsh_command_option);
break;
}
if (archive < 0)
{
open_warn (*archive_name_cursor);
if (!verify_option && access == ACCESS_WRITE && backup_option)
undo_last_backup ();
goto tryagain;
}
#if MSDOS
setmode (archive, O_BINARY);
#endif
return 1;
}