From f86082e548082ec2c3cac8920cd39dd2da0b70c4 Mon Sep 17 00:00:00 2001
From: Pavel Raiskup <praiskup@redhat.com>
Date: Mon, 28 Jul 2014 14:47:33 +0200
Subject: [PATCH] implement variable tcsh_posix_status

This patch partially reverts the dist-git commit e0b2d458fda4
because we _don't_ really want drop upstream-supported 'anyerror'
variable.  And we can not drop tcsh_posix_status neither, as we
already support that in RHEL5+ downstream.

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

Related: #759132

---
 sh.c       | 2 ++
 sh.h       | 1 +
 sh.proc.c  | 2 +-
 sh.set.c   | 5 +++++
 tc.const.c | 2 ++
 5 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/sh.c b/sh.c
index 518d610..3d627b1 100644
--- a/sh.c
+++ b/sh.c
@@ -353,6 +353,8 @@ 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 503da25..6281260 100644
--- a/sh.h
+++ b/sh.h
@@ -563,6 +563,7 @@ 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 afcf0b9..3c565f2 100644
--- a/sh.proc.c
+++ b/sh.proc.c
@@ -561,7 +561,7 @@ 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 b2c44b1..ceff8cf 100644
--- a/sh.set.c
+++ b/sh.set.c
@@ -109,6 +109,9 @@ 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);
 
@@ -771,6 +774,8 @@ 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 e49f05a..88b1d69 100644
--- a/tc.const.c
+++ b/tc.const.c
@@ -44,6 +44,8 @@ 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' };
-- 
1.9.3