travis: use VM for now

Attaching even to a children process is broken in travis's Docker.
Use VM until travis-ci/travis-ci#9033
is fixed.

Signed-off-by: Pavel Boldin <[email protected]>

Author: paboldin

.travis.yml

@@ -3,7 +3,7 @@ script: make tests
 language: c
 
 dist: trusty
-sudo: false
+sudo: required
 
 addons:
   apt:

Makefile

@@ -1,4 +1,4 @@
-
+#dummy
 
 all: src
 

tests/run_tests.sh

@@ -3,7 +3,23 @@
 set -e
 
 wait_file() {
-	while ! test -s $1; do sleep ${2-1}; done
+	local file="$1"
+	local pause="${2-1}"
+	local i=0
+	local timeout=60
+
+	while test $i -lt $timeout; do
+		if test -s $file; then
+			break
+		fi
+		sleep $pause
+		i=$((i + 1))
+	done
+
+	if test $i -eq $timeout; then
+		return 1
+	fi
+
 	return 0
 }