/* System-dependent calls for tar.
- Copyright (C) 2003 Free Software Foundation, Inc.
+ Copyright (C) 2003, 2004, 2005, 2006, 2007,
+ 2008, 2010 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
- Free Software Foundation; either version 2, or (at your option) any later
+ Free Software Foundation; either version 3, or (at your option) any later
version.
This program is distributed in the hope that it will be useful, but
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
- 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
-#include "system.h"
+#include <system.h>
#include "common.h"
-#include "rmt.h"
+#include <priv-set.h>
+#include <rmt.h>
+#include <signal.h>
#if MSDOS
bool
-sys_get_archive_stat ()
+sys_get_archive_stat (void)
{
return 0;
}
}
void
-sys_save_archive_dev_ino ()
+sys_save_archive_dev_ino (void)
{
}
void
-sys_detect_dev_null_output ()
+sys_detect_dev_null_output (void)
{
static char const dev_null[] = "nul";
}
void
-sys_drain_input_pipe ()
+sys_wait_for_child (pid_t child_pid, bool eof)
{
}
void
-sys_wait_for_child (pid_t child_pid)
+sys_spawn_shell (void)
{
+ spawnl (P_WAIT, getenv ("COMSPEC"), "-", 0);
}
-void
-sys_spawn_shell ()
+/* stat() in djgpp's C library gives a constant number of 42 as the
+ uid and gid of a file. So, comparing an FTP'ed archive just after
+ unpack would fail on MSDOS. */
+
+bool
+sys_compare_uid (struct stat *a, struct stat *b)
{
- spawnl (P_WAIT, getenv ("COMSPEC"), "-", 0);
+ return true;
}
-void
-sys_compare_uid_gid (struct stat *a, struct stat *b)
+bool
+sys_compare_gid (struct stat *a, struct stat *b)
{
- /* stat() in djgpp's C library gives a constant number of 42 as the
- uid and gid of a file. So, comparing an FTP'ed archive just after
- unpack would fail on MSDOS. */
+ return true;
}
void
sys_compare_links (struct stat *link_data, struct stat *stat_data)
{
+ return true;
}
int
return write (fd, "", 0);
}
-void
-sys_reset_uid_gid ()
-{
-}
-
-ssize_t
+size_t
sys_write_archive_buffer (void)
{
- ssize_t status;
- ssize_t written = 0;
-
- while (0 <= (status = full_write (archive, record_start->buffer + written,
- record_size - written)))
- {
- written += status;
- if (written == record_size)
- break;
- }
-
- return written ? written : status;
+ return full_write (archive, record_start->buffer, record_size);
}
/* Set ARCHIVE for writing, then compressing an archive. */
static struct stat archive_stat; /* stat block for archive file */
bool
-sys_get_archive_stat ()
+sys_get_archive_stat (void)
{
return fstat (archive, &archive_stat) == 0;
}
-
+
bool
sys_file_is_archive (struct tar_stat_info *p)
{
/* Save archive file inode and device numbers */
void
-sys_save_archive_dev_ino ()
+sys_save_archive_dev_ino (void)
{
if (!_isrmt (archive) && S_ISREG (archive_stat.st_mode))
{
/* Detect if outputting to "/dev/null". */
void
-sys_detect_dev_null_output ()
+sys_detect_dev_null_output (void)
{
static char const dev_null[] = "/dev/null";
struct stat dev_null_stat;
&& archive_stat.st_ino == dev_null_stat.st_ino));
}
-/* Manage to fully drain a pipe we might be reading, so to not break it on
- the producer after the EOF block. FIXME: one of these days, GNU tar
- might become clever enough to just stop working, once there is no more
- work to do, we might have to revise this area in such time. */
-
-void
-sys_drain_input_pipe ()
-{
- 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;
-}
-
void
-sys_wait_for_child (pid_t child_pid)
+sys_wait_for_child (pid_t child_pid, bool eof)
{
if (child_pid)
{
}
if (WIFSIGNALED (wait_status))
- ERROR ((0, 0, _("Child died with signal %d"),
- WTERMSIG (wait_status)));
+ {
+ int sig = WTERMSIG (wait_status);
+ if (!(!eof && sig == SIGPIPE))
+ FATAL_ERROR ((0, 0, _("Child died with signal %d"), sig));
+ }
else if (WEXITSTATUS (wait_status) != 0)
- ERROR ((0, 0, _("Child returned status %d"),
- WEXITSTATUS (wait_status)));
+ FATAL_ERROR ((0, 0, _("Child returned status %d"),
+ WEXITSTATUS (wait_status)));
}
}
void
-sys_spawn_shell ()
+sys_spawn_shell (void)
{
pid_t child;
const char *shell = getenv ("SHELL");
child = xfork ();
if (child == 0)
{
- execlp (shell, "-sh", "-i", 0);
+ priv_set_restore_linkdir ();
+ execlp (shell, "-sh", "-i", (char *) 0);
exec_fatal (shell);
}
else
}
}
-void
-sys_compare_uid_gid (struct stat *a, struct stat *b)
+bool
+sys_compare_uid (struct stat *a, struct stat *b)
{
- if (a->st_uid != b->st_uid)
- report_difference (_("Uid differs"));
- if (a->st_gid != b->st_gid)
- report_difference (_("Gid differs"));
+ return a->st_uid == b->st_uid;
}
-void
+bool
+sys_compare_gid (struct stat *a, struct stat *b)
+{
+ return a->st_gid == b->st_gid;
+}
+
+bool
sys_compare_links (struct stat *link_data, struct stat *stat_data)
{
- if (stat_data->st_dev != link_data->st_dev
- || stat_data->st_ino != link_data->st_ino)
- {
- report_difference (_("Not linked to %s"),
- quote (current_stat_info.link_name));
- }
+ return stat_data->st_dev == link_data->st_dev
+ && stat_data->st_ino == link_data->st_ino;
}
int
return pos < 0 ? -1 : ftruncate (fd, pos);
}
-void
-sys_reset_uid_gid ()
-{
- setuid (getuid ());
- setgid (getgid ());
-}
-
/* Return nonzero if NAME is the name of a regular file, or if the file
does not exist (so it would be created as a regular file). */
static int
return errno == ENOENT;
}
-ssize_t
+size_t
sys_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;
+ return rmtwrite (archive, record_start->buffer, record_size);
}
#define PREAD 0 /* read file descriptor from pipe() */
}
}
+static void wait_for_grandchild (pid_t pid) __attribute__ ((__noreturn__));
+
+/* Propagate any failure of the grandchild back to the parent. */
+static void
+wait_for_grandchild (pid_t pid)
+{
+ int wait_status;
+ int exit_code = 0;
+
+ while (waitpid (pid, &wait_status, 0) == -1)
+ if (errno != EINTR)
+ {
+ waitpid_error (use_compress_program_option);
+ break;
+ }
+
+ if (WIFSIGNALED (wait_status))
+ raise (WTERMSIG (wait_status));
+ else if (WEXITSTATUS (wait_status) != 0)
+ exit_code = WEXITSTATUS (wait_status);
+
+ exit (exit_code);
+}
+
/* Set ARCHIVE for writing, then compressing an archive. */
pid_t
sys_child_open_for_compress (void)
int child_pipe[2];
pid_t grandchild_pid;
pid_t child_pid;
- int wait_status;
xpipe (parent_pipe);
child_pid = xfork ();
/* The new born child tar is here! */
- program_name = _("tar (child)");
+ 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) we are writing stdout: to force reblocking;
- b) the file is to be accessed by rmt: compressor doesn't know how;
- c) the file is not a plain file. */
+ a) the file is to be accessed by rmt: compressor doesn't know how;
+ b) the file is not a plain file. */
- if (strcmp (archive_name_array[0], "-") != 0
- && !_remdev (archive_name_array[0])
+ if (!_remdev (archive_name_array[0])
&& is_regular_file (archive_name_array[0]))
{
if (backup_option)
/* We don't need a grandchild tar. Open the archive and launch the
compressor. */
-
- archive = creat (archive_name_array[0], MODE_RW);
- if (archive < 0)
+ if (strcmp (archive_name_array[0], "-"))
{
- int saved_errno = errno;
+ 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]);
+ if (backup_option)
+ undo_last_backup ();
+ errno = saved_errno;
+ open_fatal (archive_name_array[0]);
+ }
+ xdup2 (archive, STDOUT_FILENO);
}
- xdup2 (archive, STDOUT_FILENO);
- execlp (use_compress_program_option, use_compress_program_option,
- (char *) 0);
+ priv_set_restore_linkdir ();
+ execlp (use_compress_program_option, use_compress_program_option, NULL);
exec_fatal (use_compress_program_option);
}
{
/* The newborn grandchild tar is here! Launch the compressor. */
- program_name = _("tar (grandchild)");
+ set_program_name (_("tar (grandchild)"));
xdup2 (child_pipe[PWRITE], STDOUT_FILENO);
xclose (child_pipe[PREAD]);
+ priv_set_restore_linkdir ();
execlp (use_compress_program_option, use_compress_program_option,
(char *) 0);
exec_fatal (use_compress_program_option);
while (1)
{
- ssize_t status = 0;
+ size_t status = 0;
char *cursor;
size_t length;
size_t size = record_size - length;
status = safe_read (STDIN_FILENO, cursor, size);
- if (status <= 0)
+ if (status == SAFE_READ_ERROR)
+ read_fatal (use_compress_program_option);
+ if (status == 0)
break;
}
- if (status < 0)
- read_fatal (use_compress_program_option);
-
/* Copy the record. */
if (status == 0)
archive_write_error (status);
}
- /* Propagate any failure of the grandchild back to the parent. */
+ wait_for_grandchild (grandchild_pid);
+}
- while (waitpid (grandchild_pid, &wait_status, 0) == -1)
- if (errno != EINTR)
- {
- waitpid_error (use_compress_program_option);
- break;
- }
+static void
+run_decompress_program (void)
+{
+ int i;
+ const char *p, *prog = NULL;
- if (WIFSIGNALED (wait_status))
+ for (p = first_decompress_program (&i); p; p = next_decompress_program (&i))
{
- kill (child_pid, WTERMSIG (wait_status));
- exit_status = TAREXIT_FAILURE;
+ if (prog)
+ {
+ WARNOPT (WARN_DECOMPRESS_PROGRAM,
+ (0, errno, _("cannot run %s"), prog));
+ WARNOPT (WARN_DECOMPRESS_PROGRAM,
+ (0, 0, _("trying %s"), p));
+ }
+ prog = p;
+ execlp (p, p, "-d", NULL);
}
- else if (WEXITSTATUS (wait_status) != 0)
- exit_status = WEXITSTATUS (wait_status);
-
- exit (exit_status);
+ if (!prog)
+ FATAL_ERROR ((0, 0, _("unable to run decompression program")));
+ exec_fatal (prog);
}
/* Set ARCHIVE for uncompressing, then reading an archive. */
int child_pipe[2];
pid_t grandchild_pid;
pid_t child_pid;
- int wait_status;
xpipe (parent_pipe);
child_pid = xfork ();
{
/* The parent tar is still here! Just clean up. */
- read_full_records_option = 1;
archive = parent_pipe[PREAD];
xclose (parent_pipe[PWRITE]);
return child_pid;
/* The newborn child tar is here! */
- program_name = _("tar (child)");
+ set_program_name (_("tar (child)"));
+ signal (SIGPIPE, SIG_DFL);
xdup2 (parent_pipe[PWRITE], STDOUT_FILENO);
xclose (parent_pipe[PREAD]);
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);
+ priv_set_restore_linkdir ();
+ run_decompress_program ();
}
/* We do need a grandchild tar. */
{
/* The newborn grandchild tar is here! Launch the uncompressor. */
- program_name = _("tar (grandchild)");
+ 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);
+ priv_set_restore_linkdir ();
+ run_decompress_program ();
}
/* The child tar is still here! */
char *cursor;
size_t maximum;
size_t count;
- ssize_t status;
+ size_t status;
clear_read_error_count ();
error_loop:
status = rmtread (archive, record_start->buffer, record_size);
- if (status < 0)
+ if (status == SAFE_READ_ERROR)
{
archive_read_error ();
goto error_loop;
xclose (STDOUT_FILENO);
- /* Propagate any failure of the grandchild back to the parent. */
+ wait_for_grandchild (grandchild_pid);
+}
+
+\f
+
+static void
+dec_to_env (char const *envar, uintmax_t num)
+{
+ char buf[UINTMAX_STRSIZE_BOUND];
+ char *numstr;
- while (waitpid (grandchild_pid, &wait_status, 0) == -1)
+ numstr = STRINGIFY_BIGINT (num, buf);
+ if (setenv (envar, numstr, 1) != 0)
+ xalloc_die ();
+}
+
+static void
+time_to_env (char const *envar, struct timespec t)
+{
+ char buf[TIMESPEC_STRSIZE_BOUND];
+ if (setenv (envar, code_timespec (t, buf), 1) != 0)
+ xalloc_die ();
+}
+
+static void
+oct_to_env (char const *envar, unsigned long num)
+{
+ char buf[1+1+(sizeof(unsigned long)*CHAR_BIT+2)/3];
+
+ snprintf (buf, sizeof buf, "0%lo", num);
+ if (setenv (envar, buf, 1) != 0)
+ xalloc_die ();
+}
+
+static void
+str_to_env (char const *envar, char const *str)
+{
+ if (str)
+ {
+ if (setenv (envar, str, 1) != 0)
+ xalloc_die ();
+ }
+ else
+ unsetenv (envar);
+}
+
+static void
+chr_to_env (char const *envar, char c)
+{
+ char buf[2];
+ buf[0] = c;
+ buf[1] = 0;
+ if (setenv (envar, buf, 1) != 0)
+ xalloc_die ();
+}
+
+static void
+stat_to_env (char *name, char type, struct tar_stat_info *st)
+{
+ str_to_env ("TAR_VERSION", PACKAGE_VERSION);
+ str_to_env ("TAR_ARCHIVE", *archive_name_cursor);
+ dec_to_env ("TAR_VOLUME", archive_name_cursor - archive_name_array + 1);
+ dec_to_env ("TAR_BLOCKING_FACTOR", blocking_factor);
+ str_to_env ("TAR_FORMAT",
+ archive_format_string (current_format == DEFAULT_FORMAT ?
+ archive_format : current_format));
+ chr_to_env ("TAR_FILETYPE", type);
+ oct_to_env ("TAR_MODE", st->stat.st_mode);
+ str_to_env ("TAR_FILENAME", name);
+ str_to_env ("TAR_REALNAME", st->file_name);
+ str_to_env ("TAR_UNAME", st->uname);
+ str_to_env ("TAR_GNAME", st->gname);
+ time_to_env ("TAR_ATIME", st->atime);
+ time_to_env ("TAR_MTIME", st->mtime);
+ time_to_env ("TAR_CTIME", st->ctime);
+ dec_to_env ("TAR_SIZE", st->stat.st_size);
+ dec_to_env ("TAR_UID", st->stat.st_uid);
+ dec_to_env ("TAR_GID", st->stat.st_gid);
+
+ switch (type)
+ {
+ case 'b':
+ case 'c':
+ dec_to_env ("TAR_MINOR", minor (st->stat.st_rdev));
+ dec_to_env ("TAR_MAJOR", major (st->stat.st_rdev));
+ unsetenv ("TAR_LINKNAME");
+ break;
+
+ case 'l':
+ case 'h':
+ unsetenv ("TAR_MINOR");
+ unsetenv ("TAR_MAJOR");
+ str_to_env ("TAR_LINKNAME", st->link_name);
+ break;
+
+ default:
+ unsetenv ("TAR_MINOR");
+ unsetenv ("TAR_MAJOR");
+ unsetenv ("TAR_LINKNAME");
+ break;
+ }
+}
+
+static pid_t global_pid;
+static RETSIGTYPE (*pipe_handler) (int sig);
+
+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] = (char *) "/bin/sh";
+ argv[1] = (char *) "-c";
+ argv[2] = to_command_option;
+ argv[3] = NULL;
+
+ priv_set_restore_linkdir ();
+ execv ("/bin/sh", argv);
+
+ exec_fatal (file_name);
+}
+
+void
+sys_wait_command (void)
+{
+ int status;
+
+ if (global_pid < 0)
+ return;
+
+ signal (SIGPIPE, pipe_handler);
+ while (waitpid (global_pid, &status, 0) == -1)
if (errno != EINTR)
{
- waitpid_error (use_compress_program_option);
- break;
+ global_pid = -1;
+ waitpid_error (to_command_option);
+ return;
}
- if (WIFSIGNALED (wait_status))
+ if (WIFEXITED (status))
{
- kill (child_pid, WTERMSIG (wait_status));
- exit_status = TAREXIT_FAILURE;
+ if (!ignore_command_error_option && WEXITSTATUS (status))
+ ERROR ((0, 0, _("%lu: Child returned status %d"),
+ (unsigned long) global_pid, WEXITSTATUS (status)));
}
- else if (WEXITSTATUS (wait_status) != 0)
- exit_status = WEXITSTATUS (wait_status);
+ else if (WIFSIGNALED (status))
+ {
+ WARN ((0, 0, _("%lu: Child terminated on signal %d"),
+ (unsigned long) global_pid, WTERMSIG (status)));
+ }
+ else
+ ERROR ((0, 0, _("%lu: Child terminated on unknown reason"),
+ (unsigned long) global_pid));
- exit (exit_status);
+ global_pid = -1;
}
-#endif /* not MSDOS */
+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] = (char *) "/bin/sh";
+ argv[1] = (char *) "-c";
+ argv[2] = (char *) info_script_option;
+ argv[3] = NULL;
+
+ priv_set_restore_linkdir ();
+ execv (argv[0], argv);
+
+ exec_fatal (info_script_option);
+}
+
+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] = (char *) "/bin/sh";
+ argv[1] = (char *) "-c";
+ argv[2] = (char *) script_name;
+ argv[3] = NULL;
+
+ priv_set_restore_linkdir ();
+ execv (argv[0], argv);
+
+ exec_fatal (script_name);
+}
+
+#endif /* not MSDOS */
projects / chaz / tar / blobdiff