From c4ec43cec37ea82af6c0ba6bb0a3e8c3e85411ce Mon Sep 17 00:00:00 2001
From: Pavel Raiskup <praiskup@redhat.com>
Date: Mon, 28 Jul 2014 14:47:33 +0200
Subject: [PATCH] downstream: implement variable tcsh_posix_status

  This patch partially reverts the dist-git commit e0b2d458fda4 -
  because we *don't* really want to drop upstream-supported '$anyerror'
  variable. And we can't drop $tcsh_posix_status neither, as we already
  support that in RHEL5+ as a downstream patch.

  So from now, if "!defined(anyerror) ||  defined(tcsh_posix_status)",
  tcsh behaves, with regards to pipelines, same way as POSIX-like shells.

  NOTE: This feature is left undocumented intentionaly, just to push
        people use the upstream supported $anyerror.

  Resolves: #1129703
  Related:  #759132
---
 sh.c               |  2 ++
 sh.h               |  1 +
 sh.proc.c          |  2 +-
 sh.set.c           |  5 +++++
 tc.const.c         |  2 ++
 tests/variables.at | 32 ++++++++++++++++++++++++++++++++
 6 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/sh.c b/sh.c
index e9dfa81..38d073a 100644
--- a/sh.c
+++ b/sh.c
@@ -356,6 +356,8 @@ main(int argc, char **argv)
     anyerror = 1;		/* for compatibility */
     setcopy(STRanyerror, STRNULL, VAR_READWRITE);
 
+    tcsh_posix_status = 0;
+
     /* Default history size to 100 */
     setcopy(STRhistory, str2short("100"), VAR_READWRITE);
     sethistory(100);
diff --git a/sh.h b/sh.h
index 95f439d..a41e2e0 100644
--- a/sh.h
+++ b/sh.h
@@ -576,6 +576,7 @@ EXTERN int    editing IZERO;	/* doing filename expansion and line editing */
 EXTERN int    noediting IZERO;	/* initial $term defaulted to noedit */
 EXTERN int    bslash_quote IZERO;/* PWP: tcsh-style quoting?  (in sh.c) */
 EXTERN int    anyerror IZERO;	/* propagate errors from pipelines/backq */
+EXTERN int    tcsh_posix_status	IZERO;	/* negation for anyerror */
 EXTERN int    compat_expr IZERO;/* csh-style expressions? */
 EXTERN int    isoutatty IZERO;	/* is SHOUT a tty */
 EXTERN int    isdiagatty IZERO;/* is SHDIAG a tty */
diff --git a/sh.proc.c b/sh.proc.c
index 0af5e03..ac6ef5d 100644
--- a/sh.proc.c
+++ b/sh.proc.c
@@ -560,7 +560,7 @@ pjwait(struct process *pp)
     do {
 	/* In case of pipelines only the result of the last
 	 * command should be taken in account */
-	if (!anyerror && !(fp->p_flags & PBRACE)
+	if ((!anyerror || tcsh_posix_status) && !(fp->p_flags & PBRACE)
 		&& ((fp->p_flags & PPOU) || (fp->p_flags & PBACKQ)))
 	    continue;
 	if (fp->p_reason)
diff --git a/sh.set.c b/sh.set.c
index cf831b2..c155619 100644
--- a/sh.set.c
+++ b/sh.set.c
@@ -113,6 +113,9 @@ update_vars(Char *vp)
     else if (eq(vp, STRanyerror)) {
 	anyerror = 1;
     }
+    else if (eq(vp, STRtcsh_posix_status)) {
+	tcsh_posix_status = 1;
+    }
     else if (eq(vp, STRsymlinks)) {
 	Char *pn = varval(vp);
 
@@ -783,6 +786,8 @@ unset(Char **v, struct command *c)
 	loginsh = 0;
     if (adrof(STRanyerror) == 0)
 	anyerror = 0;
+    if (adrof(STRtcsh_posix_status) == 0)
+	tcsh_posix_status = 0;
     if (adrof(STRwordchars) == 0)
 	word_chars = STR_WORD_CHARS;
     if (adrof(STRedit) == 0)
diff --git a/tc.const.c b/tc.const.c
index cb39ab9..4fed182 100644
--- a/tc.const.c
+++ b/tc.const.c
@@ -41,6 +41,8 @@ Char STRrootdefautologout[] = { '1', '5', '\0' };
 Char STRautomatic[]	= { 'a', 'u', 't', 'o', 'm', 'a', 't', 'i', 'c',
 			    '\0' };
 Char STRanyerror[]	= { 'a', 'n', 'y', 'e', 'r', 'r', 'o', 'r', '\0' };
+Char STRtcsh_posix_status[] = {'t', 'c', 's', 'h', '_', 'p', 'o', 's', 'i', 'x',
+			       '_', 's', 't', 'a', 't', 'u', 's', '\0' };
 Char STRhangup[]	= { 'h', 'a', 'n', 'g', 'u', 'p', '\0' };
 Char STRaout[]		= { 'a', '.', 'o', 'u', 't', '\0' };
 Char STRtty[]		= { 't', 't', 'y', '\0' };
diff --git a/tests/variables.at b/tests/variables.at
index ffa0da2..5fa9239 100644
--- a/tests/variables.at
+++ b/tests/variables.at
@@ -1490,6 +1490,38 @@ AT_CHECK([tcsh -f -c 'echo $?tcsh'], ,
 AT_CLEANUP()
 
 
+dnl
+dnl	$ tcsh_posix_status
+dnl
+
+AT_SETUP([$ tcsh_posix_status])
+
+AT_DATA([exit_status.csh],
+[[echo $?tcsh_posix_status
+false | true ; echo $?
+set tcsh_posix_status = 1 ; echo $?tcsh_posix_status $tcsh_posix_status
+false | true ; echo $?
+set tcsh_posix_status = 0 ; echo $?tcsh_posix_status $tcsh_posix_status
+# Note it is still set!
+false | true ; echo $?
+unset tcsh_posix_status ; echo $?tcsh_posix_status
+false | true ; echo $?
+]])
+
+AT_CHECK([tcsh -f exit_status.csh],,
+[0
+1
+1 1
+0
+1 0
+0
+0
+1
+])
+
+AT_CLEANUP()
+
+
 dnl
 dnl	$ term
 dnl
-- 
2.7.4