Bash-3.2 Official Patch 39

[Chet Ramey]

                             BASH PATCH REPORT
                             =================

Bash-Release: 3.2
Patch-ID: bash32-039

Bug-Reported-by:        rew@erebor.com
Bug-Reference-ID:       <20070119065603.546D011E9C@kansas.erebor.com>
Bug-Reference-URL:      

Bug-Description:

Bash-3.2 changed the behavior of the [[ command's `=~' operator when the
right-hand side was quoted:  it matched the quoted portions as strings.
This patch introduces a new shell option: compat31.  When enabled, it
restores the bash-3.1 behavior with respect to evaluating quoted arguments
to the =~ operator.

Patch:

*** ../bash-3.2-patched/execute_cmd.c   2007-12-14 21:12:39.000000000 -0500
--- execute_cmd.c       2008-02-22 21:20:40.000000000 -0500
***************
*** 2547,2551 ****
        if (arg1 == 0)
        arg1 = nullstr;
!       arg2 = cond_expand_word (cond->right->op, rmatch ? 2 : (patmatch ? 1 : 
0));
        if (arg2 == 0)
        arg2 = nullstr;
--- 2552,2557 ----
        if (arg1 == 0)
        arg1 = nullstr;
!       arg2 = cond_expand_word (cond->right->op,
!                              (rmatch && shell_compatibility_level > 31) ? 2 : 
(patmatch ? 1 : 0));
        if (arg2 == 0)
        arg2 = nullstr;
*** ../bash-3.2-patched/shell.h 2003-06-01 15:04:36.000000000 -0400
--- shell.h     2008-02-22 21:16:48.000000000 -0500
***************
*** 90,93 ****
--- 90,94 ----
  extern int interactive, interactive_shell;
  extern int startup_state;
+ extern int shell_compatibility_level;
  
  /* Structure to pass around that holds a bitmap of file descriptors
*** ../bash-3.2-patched/version.c       2007-12-14 21:12:29.000000000 -0500
--- version.c   2008-04-10 08:22:22.000000000 -0400
***************
*** 44,47 ****
--- 44,50 ----
  const char *sccs_version = SCCSVERSION;
  
+ /* If == 31, shell compatible with bash-3.1, == 32 with bash-3.2, and so on */
+ int shell_compatibility_level = 32;
+ 
  /* Functions for getting, setting, and displaying the shell version. */
  
*** ../bash-3.2-patched/builtins/shopt.def      2005-02-19 17:25:03.000000000 
-0500
--- builtins/shopt.def  2008-04-10 08:13:32.000000000 -0400
***************
*** 102,105 ****
--- 102,107 ----
  static int set_shellopts_after_change __P((int));
  
+ static int set_compatibility_level __P((int));
+ 
  #if defined (RESTRICTED_SHELL)
  static int set_restricted_shell __P((int));
***************
*** 107,110 ****
--- 109,113 ----
  
  static int shopt_login_shell;
+ static int shopt_compat31;
  
  typedef int shopt_set_func_t __P((int));
***************
*** 122,125 ****
--- 125,129 ----
    { "cmdhist", &command_oriented_history, (shopt_set_func_t *)NULL },
  #endif
+   { "compat31", &shopt_compat31, set_compatibility_level },
    { "dotglob", &glob_dot_filenames, (shopt_set_func_t *)NULL },
    { "execfail", &no_exit_on_failed_exec, (shopt_set_func_t *)NULL },
***************
*** 460,463 ****
--- 464,479 ----
  }
  
+ static int
+ set_compatibility_level (mode)
+      int mode;
+ {
+   /* Need to change logic here as we add more compatibility levels */
+   if (shopt_compat31)
+     shell_compatibility_level = 31;
+   else
+     shell_compatibility_level = 32;
+   return 0;
+ }
+ 
  #if defined (RESTRICTED_SHELL)
  /* Don't allow the value of restricted_shell to be modified. */
*** ../bash-3.2-patched/doc/bash.1      2006-09-28 10:26:05.000000000 -0400
--- doc/bash.1  2008-04-25 12:32:49.000000000 -0400
***************
*** 7978,7981 ****
--- 8200,8209 ----
  easy re-editing of multi-line commands.
  .TP 8
+ .B compat31
+ If set,
+ .B bash
+ changes its behavior to that of version 3.1 with respect to quoted
+ arguments to the conditional command's =~ operator.
+ .TP 8
  .B dotglob
  If set, 
*** ../bash-20080214/doc/bashref.texi   2008-02-08 21:28:35.000000000 -0500
--- doc/bashref.texi    2008-02-22 21:44:51.000000000 -0500
***************
*** 4053,4056 ****
--- 4061,4069 ----
  easy re-editing of multi-line commands.
  
+ @item compat31
+ If set, Bash
+ changes its behavior to that of version 3.1 with respect to quoted
+ arguments to the conditional command's =~ operator.
+ 
  @item dotglob
  If set, Bash includes filenames beginning with a `.' in
*** ../bash-3.2-patched/tests/shopt.right       2005-02-19 17:46:09.000000000 
-0500
--- tests/shopt.right   2008-04-28 09:13:07.000000000 -0400
***************
*** 7,10 ****
--- 7,11 ----
  shopt -u checkwinsize
  shopt -s cmdhist
+ shopt -u compat31
  shopt -u dotglob
  shopt -u execfail
***************
*** 54,57 ****
--- 55,59 ----
  shopt -u checkhash
  shopt -u checkwinsize
+ shopt -u compat31
  shopt -u dotglob
  shopt -u execfail
***************
*** 78,81 ****
--- 80,84 ----
  checkhash             off
  checkwinsize          off
+ compat31              off
  dotglob               off
  execfail              off

*** ../bash-3.2/patchlevel.h    Thu Apr 13 08:31:04 2006
--- patchlevel.h        Mon Oct 16 14:22:54 2006
***************
*** 26,30 ****
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 38
  
  #endif /* _PATCHLEVEL_H_ */
--- 26,30 ----
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 39
  
  #endif /* _PATCHLEVEL_H_ */

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer

Chet Ramey, ITS, CWRU    chet@case.edu    http://cnswww.cns.cwru.edu/~chet/