int
sys_exec_command (char *file_name, int typechar, struct tar_stat_info *st)
{
int p[2];
char *argv[4];
xpipe (p);
pipe_handler = signal (SIGPIPE, SIG_IGN);
global_pid = xfork ();
if (global_pid != 0)
{
xclose (p[PREAD]);
return p[PWRITE];
}
/* Child */
xdup2 (p[PREAD], STDIN_FILENO);
xclose (p[PWRITE]);
stat_to_env (file_name, typechar, st);
argv[0] = "/bin/sh";
argv[1] = "-c";
argv[2] = to_command_option;
argv[3] = NULL;
execv ("/bin/sh", argv);
exec_fatal (file_name);
}
static void
run_decompress_program (void)
{
int i;
const char *p, *prog = NULL;
struct wordsplit ws;
int wsflags = (WRDSF_DEFFLAGS | WRDSF_ENV | WRDSF_DOOFFS) & ~WRDSF_NOVAR;
ws.ws_env = (const char **) environ;
ws.ws_offs = 1;
for (p = first_decompress_program (&i); p; p = next_decompress_program (&i))
{
if (prog)
{
WARNOPT (WARN_DECOMPRESS_PROGRAM,
(0, errno, _("cannot run %s"), prog));
WARNOPT (WARN_DECOMPRESS_PROGRAM,
(0, 0, _("trying %s"), p));
}
if (wordsplit (p, &ws, wsflags))
FATAL_ERROR ((0, 0, _("cannot split string '%s': %s"),
p, wordsplit_strerror (&ws)));
wsflags |= WRDSF_REUSE;
memmove(ws.ws_wordv, ws.ws_wordv + ws.ws_offs,
sizeof(ws.ws_wordv[0])*ws.ws_wordc);
ws.ws_wordv[ws.ws_wordc] = (char *) "-d";
prog = p;
execvp (ws.ws_wordv[0], ws.ws_wordv);
ws.ws_wordv[ws.ws_wordc] = NULL;
}
if (!prog)
FATAL_ERROR ((0, 0, _("unable to run decompression program")));
exec_fatal (prog);
}
void
sys_spawn_shell (void)
{
pid_t child;
const char *shell = getenv ("SHELL");
if (! shell)
shell = "/bin/sh";
child = xfork ();
if (child == 0)
{
priv_set_restore_linkdir ();
execlp (shell, "-sh", "-i", NULL);
exec_fatal (shell);
}
else
{
int wait_status;
while (waitpid (child, &wait_status, 0) == -1)
if (errno != EINTR)
{
waitpid_error (shell);
break;
}
}
}
static _Noreturn void
xexec (const char *cmd)
{
struct wordsplit ws;
ws.ws_env = (const char **) environ;
if (wordsplit (cmd, &ws, (WRDSF_DEFFLAGS | WRDSF_ENV) & ~WRDSF_NOVAR))
FATAL_ERROR ((0, 0, _("cannot split string '%s': %s"),
cmd, wordsplit_strerror (&ws)));
execvp (ws.ws_wordv[0], ws.ws_wordv);
exec_fatal (cmd);
}
void
sys_exec_checkpoint_script (const char *script_name,
const char *archive_name,
int checkpoint_number)
{
pid_t pid;
char *argv[4];
char uintbuf[UINTMAX_STRSIZE_BOUND];
pid = xfork ();
if (pid != 0)
{
/* Master */
int status;
while (waitpid (pid, &status, 0) == -1)
if (errno != EINTR)
{
waitpid_error (script_name);
break;
}
return;
}
/* Child */
setenv ("TAR_VERSION", PACKAGE_VERSION, 1);
setenv ("TAR_ARCHIVE", archive_name, 1);
setenv ("TAR_CHECKPOINT", STRINGIFY_BIGINT (checkpoint_number, uintbuf), 1);
setenv ("TAR_BLOCKING_FACTOR",
STRINGIFY_BIGINT (blocking_factor, uintbuf), 1);
setenv ("TAR_SUBCOMMAND", subcommand_string (subcommand_option), 1);
setenv ("TAR_FORMAT",
archive_format_string (current_format == DEFAULT_FORMAT ?
archive_format : current_format), 1);
argv[0] = "/bin/sh";
argv[1] = "-c";
argv[2] = (char*) script_name;
argv[3] = NULL;
execv (argv[0], argv);
exec_fatal (script_name);
}
int
sys_exec_info_script (const char **archive_name, int volume_number)
{
pid_t pid;
char *argv[4];
char uintbuf[UINTMAX_STRSIZE_BOUND];
int p[2];
static RETSIGTYPE (*saved_handler) (int sig);
xpipe (p);
saved_handler = signal (SIGPIPE, SIG_IGN);
pid = xfork ();
if (pid != 0)
{
/* Master */
int rc;
int status;
char *buf = NULL;
size_t size = 0;
FILE *fp;
xclose (p[PWRITE]);
fp = fdopen (p[PREAD], "r");
rc = getline (&buf, &size, fp);
fclose (fp);
if (rc > 0 && buf[rc-1] == '\n')
buf[--rc] = 0;
while (waitpid (pid, &status, 0) == -1)
if (errno != EINTR)
{
signal (SIGPIPE, saved_handler);
waitpid_error (info_script_option);
return -1;
}
signal (SIGPIPE, saved_handler);
if (WIFEXITED (status))
{
if (WEXITSTATUS (status) == 0 && rc > 0)
*archive_name = buf;
else
free (buf);
return WEXITSTATUS (status);
}
free (buf);
return -1;
}
/* Child */
setenv ("TAR_VERSION", PACKAGE_VERSION, 1);
setenv ("TAR_ARCHIVE", *archive_name, 1);
setenv ("TAR_VOLUME", STRINGIFY_BIGINT (volume_number, uintbuf), 1);
setenv ("TAR_BLOCKING_FACTOR",
STRINGIFY_BIGINT (blocking_factor, uintbuf), 1);
setenv ("TAR_SUBCOMMAND", subcommand_string (subcommand_option), 1);
setenv ("TAR_FORMAT",
archive_format_string (current_format == DEFAULT_FORMAT ?
archive_format : current_format), 1);
setenv ("TAR_FD", STRINGIFY_BIGINT (p[PWRITE], uintbuf), 1);
xclose (p[PREAD]);
argv[0] = "/bin/sh";
argv[1] = "-c";
argv[2] = (char*) info_script_option;
argv[3] = NULL;
execv (argv[0], argv);
exec_fatal (info_script_option);
}
/* Set ARCHIVE for uncompressing, then reading an archive. */
pid_t
sys_child_open_for_uncompress (void)
{
int parent_pipe[2];
int child_pipe[2];
pid_t grandchild_pid;
pid_t child_pid;
xpipe (parent_pipe);
child_pid = xfork ();
if (child_pid > 0)
{
/* The parent tar is still here! Just clean up. */
archive = parent_pipe[PREAD];
xclose (parent_pipe[PWRITE]);
return child_pid;
}
/* The newborn child tar is here! */
set_program_name (_("tar (child)"));
signal (SIGPIPE, SIG_DFL);
xdup2 (parent_pipe[PWRITE], STDOUT_FILENO);
xclose (parent_pipe[PREAD]);
/* Check if we need a grandchild tar. This happens only if either:
a) we're reading stdin: to force unblocking;
b) the file is to be accessed by rmt: compressor doesn't know how;
c) the file is not a plain file. */
if (strcmp (archive_name_array[0], "-") != 0
&& !_remdev (archive_name_array[0])
&& is_regular_file (archive_name_array[0]))
{
/* We don't need a grandchild tar. Open the archive and lauch the
uncompressor. */
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);
}
/* We do need a grandchild tar. */
xpipe (child_pipe);
grandchild_pid = xfork ();
if (grandchild_pid == 0)
{
/* The newborn grandchild tar is here! Launch the uncompressor. */
set_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);
}
/* The child tar is still here! */
/* Prepare for unblocking the data from the archive into the
uncompressor. */
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]);
/* Let's read the archive and pipe it into stdout. */
while (1)
{
char *cursor;
size_t maximum;
size_t count;
size_t status;
clear_read_error_count ();
error_loop:
status = rmtread (archive, record_start->buffer, record_size);
if (status == SAFE_READ_ERROR)
{
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);
wait_for_grandchild (grandchild_pid);
}
/* Set ARCHIVE for writing, then compressing an archive. */
pid_t
sys_child_open_for_compress (void)
{
int parent_pipe[2];
int child_pipe[2];
pid_t grandchild_pid;
pid_t child_pid;
xpipe (parent_pipe);
child_pid = xfork ();
if (child_pid > 0)
{
/* The parent tar is still here! Just clean up. */
archive = parent_pipe[PWRITE];
xclose (parent_pipe[PREAD]);
return child_pid;
}
/* The new born child tar is here! */
set_program_name (_("tar (child)"));
signal (SIGPIPE, SIG_DFL);
xdup2 (parent_pipe[PREAD], STDIN_FILENO);
xclose (parent_pipe[PWRITE]);
/* Check if we need a grandchild tar. This happens only if either:
a) the file is to be accessed by rmt: compressor doesn't know how;
b) the file is not a plain file. */
if (!_remdev (archive_name_array[0])
&& is_regular_file (archive_name_array[0]))
{
if (backup_option)
maybe_backup_file (archive_name_array[0], 1);
/* We don't need a grandchild tar. Open the archive and launch the
compressor. */
if (strcmp (archive_name_array[0], "-"))
{
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, NULL);
exec_fatal (use_compress_program_option);
}
/* We do need a grandchild tar. */
xpipe (child_pipe);
grandchild_pid = xfork ();
if (grandchild_pid == 0)
{
/* The newborn grandchild tar is here! Launch the compressor. */
set_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);
}
/* The child tar is still here! */
/* Prepare for reblocking the data from the compressor into the archive. */
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]);
}
/* Let's read out of the stdin pipe and write an archive. */
while (1)
{
size_t status = 0;
char *cursor;
size_t length;
/* Assemble a record. */
for (length = 0, cursor = record_start->buffer;
length < record_size;
length += status, cursor += status)
{
size_t size = record_size - length;
status = safe_read (STDIN_FILENO, cursor, size);
if (status == SAFE_READ_ERROR)
read_fatal (use_compress_program_option);
if (status == 0)
break;
}
/* Copy the record. */
if (status == 0)
{
/* We hit the end of the file. Write last record at
full length, as the only role of the grandchild is
doing proper reblocking. */
if (length > 0)
{
memset (record_start->buffer + length, 0, record_size - length);
status = sys_write_archive_buffer ();
if (status != record_size)
archive_write_error (status);
}
/* There is nothing else to read, break out. */
break;
}
status = sys_write_archive_buffer ();
if (status != record_size)
archive_write_error (status);
}
wait_for_grandchild (grandchild_pid);
}
