X-Git-Url: https://git.dogcows.com/gitweb?a=blobdiff_plain;f=src%2Fsystem.c;h=ba1d191e0824473a73b72ac2334804b497b6677e;hb=87ac3207fbc12e3f186f338b36012d1ee40e90c1;hp=99cb0f33146414d62ef8dd4f20e07319e44c7ae6;hpb=813aa07a89b748aac401d3b351e8075c658a8133;p=chaz%2Ftar

diff --git a/src/system.c b/src/system.c
index 99cb0f3..ba1d191 100644
--- a/src/system.c
+++ b/src/system.c
@@ -1,10 +1,10 @@
 /* System-dependent calls for tar.
 
-   Copyright (C) 2003, 2004 Free Software Foundation, Inc.
+   Copyright (C) 2003, 2004, 2005, 2006, 2007 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
@@ -17,6 +17,7 @@
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
 
 #include <system.h>
+#include <setenv.h>
 
 #include "common.h"
 #include <rmt.h>
@@ -349,7 +350,7 @@ sys_child_open_for_compress (void)
 	  if (archive < 0)
 	    {
 	      int saved_errno = errno;
-	      
+
 	      if (backup_option)
 		undo_last_backup ();
 	      errno = saved_errno;
@@ -657,6 +658,7 @@ chr_to_env (char *envar, char c)
 static void
 stat_to_env (char *name, char type, struct tar_stat_info *st)
 {
+  str_to_env ("TAR_VERSION", PACKAGE_VERSION);
   chr_to_env ("TAR_FILETYPE", type);
   oct_to_env ("TAR_MODE", st->stat.st_mode);
   str_to_env ("TAR_FILENAME", name);
@@ -694,7 +696,7 @@ stat_to_env (char *name, char type, struct tar_stat_info *st)
     }
 }
 
-static pid_t pid;
+static pid_t global_pid;
 static RETSIGTYPE (*pipe_handler) (int sig);
 
 int
@@ -705,9 +707,9 @@ sys_exec_command (char *file_name, int typechar, struct tar_stat_info *st)
 
   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];
@@ -734,14 +736,14 @@ 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;
       }
@@ -750,18 +752,92 @@ 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];
+
+  xpipe (p);
+  pipe_handler = signal (SIGPIPE, SIG_IGN);
+
+  pid = xfork ();
+
+  if (pid != 0)
+    {
+      /* Master */
+
+      int rc;
+      int status;
+      char *buf;
+      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)
+	  {
+	    waitpid_error (info_script_option);
+	    return -1;
+	  }
+
+      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_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);
+}
+
+
 #endif /* not MSDOS */