mg-debug-fail: Catch attempts to read from a tty

When stdin is a tty, do not try to dump it.

Signed-off-by: Ian Jackson <Ian.Jackson@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

diff --git a/mg-debug-fail b/mg-debug-fail
index a163aef4f4e24bb6e4c2ece04abe22a17068f61d..47ad68ab06e0a8f6f998b33b4451de3b62a1f23e 100755 (executable)
--- a/mg-debug-fail
+++ b/mg-debug-fail
@@ -3,10 +3,10 @@
 # This script can be provided anywhere an executable or command name is
 # wanted.  It prints its arguments, and its stdin, to its stderr, and
 # then exits nonzero.
-#
-# When using this it may be useful to provide </dev/null as a
-# redirection for the whole program under test.  Otherwise things
-# can mysteriously hang.
+
+if tty >/dev/null 2>&1; then
+       exec </dev/null
+fi
 
 bash -xc ': mg-debug-fail "$@"' x "$@"
 egrep '' >&2