Put integration daemon socket in /run

This fixes a case where on Docker For Mac if you need to bind mount the
bundles dir (e.g. to get test results back).
The unix socket does not work over oxsfs, so instead we put it in a
tmpfs.

Signed-off-by: Brian Goff <cpuguy83@gmail.com>

hack/make/.integration-daemon-start

@@ -102,8 +102,19 @@ if [ -z "$DOCKER_TEST_HOST" ]; then
 		)
 	fi
 
-	# "pwd" tricks to make sure $DEST is an absolute path, not a relative one
-	export DOCKER_HOST="unix://$(cd "$DEST" && pwd)/docker.sock"
+	if [ -n "${DOCKER_ROOTLESS}" ]; then
+		# "pwd" tricks to make sure $DEST is an absolute path, not a relative one
+		export DOCKER_HOST="unix://$(cd "$DEST" && pwd)/docker.sock"
+	else
+		# Put socket in /run because:
+		# 1. That's the normal place for such things
+		# 2. When running on Docker For Mac, if you need to run tests with the bundles dir mounted (e.g. to poke through test artifacts).
+		#    the socket will not work because it will be over osxfs.
+		mkdir -p /run/docker
+		sock_dir=$(mktemp -d -p /run/docker)
+		chmod 0755 "$sock_dir"
+		export DOCKER_HOST="unix://${sock_dir}/docker.sock"
+	fi
 	(
 		echo "Starting dockerd"
 		[ -n "$TESTDEBUG" ] && set -x