[Bug-tar] tar 1.23 Solaris regression

[Petr Sumbera]

Hi Sergey, et al,

Following commit is causing problem at some cases to GNU tar running on 
Solaris.

http://git.savannah.gnu.org/gitweb/?p=tar.git;a=commit;h=b216fed6340d073d33351145be033ecc5b903c7a

Problem is that users are expecting that their scripts (in our case info 
script which is defined with option -F) is run with the same set of 
privileges as tar program. In this case it's expected that script will 
execute program for CD burning (which requires some additional privileges).

It seems that following fix solves the issue:

--- tar-1.23/src/system.c.orig  Mon Aug  2 05:52:37 2010
+++ tar-1.23/src/system.c       Mon Aug  2 05:58:38 2010
@@ -20,6 +20,7 @@
 #include <system.h>

 #include "common.h"
+#include <priv-set.h>
 #include <rmt.h>
 #include <signal.h>

@@ -816,6 +817,8 @@
   argv[2] = (char*) info_script_option;
   argv[3] = NULL;

+  priv_set_restore_linkdir();
+
   execv (argv[0], argv);

   exec_fatal (info_script_option);

But First I'm not sure what is the reason for avoiding PRIV_SYS_LINKDIR 
privilege. And if this is really necassary it should be probably 
restored for every other program execution in src/system.c.

Thanks for any comment!

Petr