X-Git-Url: https://git.dogcows.com/gitweb?a=blobdiff_plain;f=src%2Fsystem.c;h=94142336ef6d021868836cf94a97720ee9d20429;hb=9df17e6005e7a333399e3dc21a7afec75565c767;hp=612951bf98d72556dc7a581389feff13f07a73be;hpb=f2bf9f2ffa06c0a89a799e64672f58a8e7d0efc7;p=chaz%2Ftar
diff --git a/src/system.c b/src/system.c
index 612951b..9414233 100644
--- a/src/system.c
+++ b/src/system.c
@@ -1,10 +1,10 @@
/* System-dependent calls for tar.
- Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
+ Copyright 2003-2008, 2010, 2013-2014 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
@@ -13,16 +13,28 @@
Public License for more details.
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.,
- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+ with this program. If not, see . */
#include
-#include
-#include
#include "common.h"
+#include
#include
#include
+#include
+
+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);
+}
#if MSDOS
@@ -53,12 +65,7 @@ sys_detect_dev_null_output (void)
}
void
-sys_drain_input_pipe (void)
-{
-}
-
-void
-sys_wait_for_child (pid_t child_pid)
+sys_wait_for_child (pid_t child_pid, bool eof)
{
}
@@ -162,26 +169,8 @@ sys_detect_dev_null_output (void)
&& 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 (void)
-{
- size_t r;
-
- if (access_mode == ACCESS_READ
- && ! _isrmt (archive)
- && (S_ISFIFO (archive_stat.st_mode) || S_ISSOCK (archive_stat.st_mode)))
- while ((r = rmtread (archive, record_start->buffer, record_size)) != 0
- && r != SAFE_READ_ERROR)
- continue;
-}
-
void
-sys_wait_for_child (pid_t child_pid)
+sys_wait_for_child (pid_t child_pid, bool eof)
{
if (child_pid)
{
@@ -195,11 +184,14 @@ sys_wait_for_child (pid_t 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)));
}
}
@@ -213,7 +205,8 @@ sys_spawn_shell (void)
child = xfork ();
if (child == 0)
{
- execlp (shell, "-sh", "-i", (char *) 0);
+ priv_set_restore_linkdir ();
+ execlp (shell, "-sh", "-i", NULL);
exec_fatal (shell);
}
else
@@ -304,6 +297,30 @@ xdup2 (int from, int into)
}
}
+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)
@@ -312,7 +329,6 @@ 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 ();
@@ -328,7 +344,8 @@ sys_child_open_for_compress (void)
/* 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]);
@@ -359,8 +376,8 @@ sys_child_open_for_compress (void)
}
xdup2 (archive, STDOUT_FILENO);
}
- execlp (use_compress_program_option, use_compress_program_option, NULL);
- exec_fatal (use_compress_program_option);
+ priv_set_restore_linkdir ();
+ xexec (use_compress_program_option);
}
/* We do need a grandchild tar. */
@@ -372,13 +389,12 @@ sys_child_open_for_compress (void)
{
/* 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]);
- execlp (use_compress_program_option, use_compress_program_option,
- (char *) 0);
- exec_fatal (use_compress_program_option);
+ priv_set_restore_linkdir ();
+ xexec (use_compress_program_option);
}
/* The child tar is still here! */
@@ -445,24 +461,43 @@ sys_child_open_for_compress (void)
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;
+ struct wordsplit ws;
+ int wsflags = (WRDSF_DEFFLAGS | WRDSF_ENV | WRDSF_DOOFFS) & ~WRDSF_NOVAR;
- if (WIFSIGNALED (wait_status))
+ ws.ws_env = (const char **) environ;
+ ws.ws_offs = 1;
+
+ 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));
+ }
+ 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;
}
- 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. */
@@ -473,7 +508,6 @@ sys_child_open_for_uncompress (void)
int child_pipe[2];
pid_t grandchild_pid;
pid_t child_pid;
- int wait_status;
xpipe (parent_pipe);
child_pid = xfork ();
@@ -489,7 +523,8 @@ sys_child_open_for_uncompress (void)
/* 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]);
@@ -510,9 +545,8 @@ sys_child_open_for_uncompress (void)
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. */
@@ -524,13 +558,12 @@ sys_child_open_for_uncompress (void)
{
/* 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! */
@@ -583,30 +616,13 @@ sys_child_open_for_uncompress (void)
xclose (STDOUT_FILENO);
- /* Propagate any failure of the grandchild back to the parent. */
-
- 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);
+ wait_for_grandchild (grandchild_pid);
}
static void
-dec_to_env (char *envar, uintmax_t num)
+dec_to_env (char const *envar, uintmax_t num)
{
char buf[UINTMAX_STRSIZE_BOUND];
char *numstr;
@@ -617,7 +633,7 @@ dec_to_env (char *envar, uintmax_t num)
}
static void
-time_to_env (char *envar, struct timespec t)
+time_to_env (char const *envar, struct timespec t)
{
char buf[TIMESPEC_STRSIZE_BOUND];
if (setenv (envar, code_timespec (t, buf), 1) != 0)
@@ -625,7 +641,7 @@ time_to_env (char *envar, struct timespec t)
}
static void
-oct_to_env (char *envar, unsigned long num)
+oct_to_env (char const *envar, unsigned long num)
{
char buf[1+1+(sizeof(unsigned long)*CHAR_BIT+2)/3];
@@ -635,7 +651,7 @@ oct_to_env (char *envar, unsigned long num)
}
static void
-str_to_env (char *envar, char const *str)
+str_to_env (char const *envar, char const *str)
{
if (str)
{
@@ -647,7 +663,7 @@ str_to_env (char *envar, char const *str)
}
static void
-chr_to_env (char *envar, char c)
+chr_to_env (char const *envar, char c)
{
char buf[2];
buf[0] = c;
@@ -660,6 +676,12 @@ 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);
@@ -697,20 +719,19 @@ stat_to_env (char *name, char type, struct tar_stat_info *st)
}
}
-static pid_t pid;
-static RETSIGTYPE (*pipe_handler) (int sig);
+static pid_t global_pid;
+static void (*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);
- pid = xfork ();
+ global_pid = xfork ();
- if (pid != 0)
+ if (global_pid != 0)
{
xclose (p[PREAD]);
return p[PWRITE];
@@ -722,14 +743,8 @@ sys_exec_command (char *file_name, int typechar, struct tar_stat_info *st)
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);
+ priv_set_restore_linkdir ();
+ xexec (to_command_option);
}
void
@@ -737,14 +752,14 @@ sys_wait_command (void)
{
int status;
- if (pid < 0)
+ if (global_pid < 0)
return;
signal (SIGPIPE, pipe_handler);
- while (waitpid (pid, &status, 0) == -1)
+ while (waitpid (global_pid, &status, 0) == -1)
if (errno != EINTR)
{
- pid = -1;
+ global_pid = -1;
waitpid_error (to_command_option);
return;
}
@@ -753,30 +768,30 @@ sys_wait_command (void)
{
if (!ignore_command_error_option && WEXITSTATUS (status))
ERROR ((0, 0, _("%lu: Child returned status %d"),
- (unsigned long) pid, WEXITSTATUS (status)));
+ (unsigned long) global_pid, WEXITSTATUS (status)));
}
else if (WIFSIGNALED (status))
{
WARN ((0, 0, _("%lu: Child terminated on signal %d"),
- (unsigned long) pid, WTERMSIG (status)));
+ (unsigned long) global_pid, WTERMSIG (status)));
}
else
ERROR ((0, 0, _("%lu: Child terminated on unknown reason"),
- (unsigned long) pid));
+ (unsigned long) global_pid));
- pid = -1;
+ global_pid = -1;
}
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 void (*saved_handler) (int sig);
xpipe (p);
- pipe_handler = signal (SIGPIPE, SIG_IGN);
+ saved_handler = signal (SIGPIPE, SIG_IGN);
pid = xfork ();
@@ -786,7 +801,7 @@ sys_exec_info_script (const char **archive_name, int volume_number)
int rc;
int status;
- char *buf;
+ char *buf = NULL;
size_t size = 0;
FILE *fp;
@@ -801,10 +816,13 @@ sys_exec_info_script (const char **archive_name, int volume_number)
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)
@@ -822,23 +840,58 @@ sys_exec_info_script (const char **archive_name, int volume_number)
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]);
- xdup2 (p[PWRITE], 3);
- argv[0] = "/bin/sh";
- argv[1] = "-c";
- argv[2] = (char*) info_script_option;
- argv[3] = NULL;
+ priv_set_restore_linkdir ();
+ xexec (info_script_option);
+}
- execv (argv[0], argv);
+void
+sys_exec_checkpoint_script (const char *script_name,
+ const char *archive_name,
+ int checkpoint_number)
+{
+ pid_t pid;
+ char uintbuf[UINTMAX_STRSIZE_BOUND];
- exec_fatal (info_script_option);
-}
+ 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);
+ priv_set_restore_linkdir ();
+ xexec (script_name);
+}
#endif /* not MSDOS */