Make TAPE=- mean stdout in tar

Some scripts and GUI ssh clients assume that tar writes to standard output by
default.  This changes allows enforcing such behavior by setting TAPE="-" in
user profile.

Also, this makes parsing argument to "-f" option and contents of TAPE
environment variable consistent.

OK guenther@, jmc@ and sthen@

2 files changed, 22 insertions, 8 deletions

diff --git a/bin/pax/options.c b/bin/pax/options.c
index be2ffb2c245..2b15d395203 100644
--- a/bin/pax/options.c
+++ b/bin/pax/options.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: options.c,v 1.90 2015/04/18 18:28:37 deraadt Exp $	*/
+/*	$OpenBSD: options.c,v 1.91 2015/05/18 20:26:16 czarkoff Exp $	*/
 /*	$NetBSD: options.c,v 1.6 1996/03/26 23:54:18 mrg Exp $	*/
 
 /*-
@@ -877,6 +877,16 @@ tar_options(int argc, char **argv)
 	argc -= optind;
 	argv += optind;
 
+	if (!fstdin && ((arcname == NULL) || (*arcname == '\0'))) {
+		arcname = getenv("TAPE");
+		if ((arcname == NULL) || (*arcname == '\0'))
+			arcname = _PATH_DEFTAPE;
+		else if ((arcname[0] == '-') && (arcname[1]== '\0')) {
+			arcname = NULL;
+			fstdin = 1;
+		}
+	}
+
 	/* Traditional tar behaviour (pax uses stderr unless in list mode) */
 	if (fstdin == 1 && act == ARCHIVE)
 		listf = stderr;
@@ -1030,11 +1040,6 @@ tar_options(int argc, char **argv)
 		maxflt = 0;
 		break;
 	}
-	if (!fstdin && ((arcname == NULL) || (*arcname == '\0'))) {
-		arcname = getenv("TAPE");
-		if ((arcname == NULL) || (*arcname == '\0'))
-			arcname = _PATH_DEFTAPE;
-	}
 }
 
 int mkpath(char *);
diff --git a/bin/pax/tar.1 b/bin/pax/tar.1
index c4c10834f88..ba487d4233f 100644
--- a/bin/pax/tar.1
+++ b/bin/pax/tar.1
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: tar.1,v 1.57 2015/01/15 19:06:31 schwarze Exp $
+.\"	$OpenBSD: tar.1,v 1.58 2015/05/18 20:26:16 czarkoff Exp $
 .\"
 .\" Copyright (c) 1996 SigmaSoft, Th. Lockert
 .\" All rights reserved.
@@ -23,7 +23,7 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: January 15 2015 $
+.Dd $Mdocdate: May 18 2015 $
 .Dt TAR 1
 .Os
 .Sh NAME
@@ -145,6 +145,12 @@ Stop after the first error.
 Filename where the archive is stored.
 Defaults to
 .Pa /dev/rst0 .
+If set to hyphen
+.Pq Sq -
+standard output is used.
+See also the
+.Ev TAPE
+environment variable.
 .It Fl H
 Follow symlinks given on the command line only.
 .It Fl h
@@ -287,6 +293,9 @@ Path in which to store temporary files.
 .It Ev TAPE
 Default tape device to use instead of
 .Pa /dev/rst0 .
+If set to hyphen
+.Pq Sq -
+standard output is used.
 .El
 .Sh FILES
 .Bl -tag -width "/dev/rst0"