Merge pull request #35 from balena-io-experimental/kyle/stderr-redire…

…ction

Create /dev/fd symlink so anonymous pipes can be created

overlay/sbin/init

@@ -6,6 +6,9 @@ exec 2>/dev/console
 chown root:tty /dev/console
 chmod 622 /dev/console
 
+# create symlink to /proc/self/fd
+ln -s /proc/self/fd /dev/fd
+
 ln -s /proc/self/fd/0 /dev/stdin
 ln -s /proc/self/fd/1 /dev/stdout
 ln -s /proc/self/fd/2 /dev/stderr

test/healthcheck.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env bash
 
 # This script is run as the healthcheck command for the VM image and
 # the logs are grepped for the exit status message to determine success/fail.
@@ -21,8 +21,15 @@ uname -a
 
 df -h
 
-echo "Hello, World!" >/dev/stdout
-echo "Hello, World!" >/dev/stderr
+ls -al /dev/
+
+echo "Testing stdout" >&1
+echo "Testing stderr" >&2
+echo "Testing stdout" >/dev/stdout
+echo "Testing stderr" >/dev/stderr
+
+echo "Testing stdout" 1> >(tee /tmp/stdout)
+echo "Testing stderr" 2> >(tee /tmp/stderr)
 
 if [ -n "${HOSTNAME}" ]; then
     test "${HOSTNAME}" = "$(hostname)"