Merge pull request #6419 from docker/6416-runsh-no-input

Always connect Compose container to stdin

script/run/run.sh

@@ -47,14 +47,14 @@ if [ -n "$HOME" ]; then
 fi
 
 # Only allocate tty if we detect one
-if [ -t 0 ]; then
-    if [ -t 1 ]; then
+if [ -t 0 -a -t 1 ]; then
         DOCKER_RUN_OPTIONS="$DOCKER_RUN_OPTIONS -t"
-    fi
-else
-    DOCKER_RUN_OPTIONS="$DOCKER_RUN_OPTIONS -i"
 fi
 
+# Always set -i to support piped and terminal input in run/exec
+DOCKER_RUN_OPTIONS="$DOCKER_RUN_OPTIONS -i"
+
+
 # Handle userns security
 if [ ! -z "$(docker info 2>/dev/null | grep userns)" ]; then
     DOCKER_RUN_OPTIONS="$DOCKER_RUN_OPTIONS --userns=host"