Update to how we choose if we are running udevd or dumb-udev

This fixes some issues I found with startup.

overlay/etc/cont-init.d/30-configure_udev.sh

@@ -9,50 +9,44 @@
 # Modified By: Josh.5 (jsunnex@gmail.com)
 ###
 
-# Running udev only works in privileged container
-# Source: https://github.com/balena-io-playground/balena-base-images/
-tmp_mount='/tmp/privileged_test'
-mkdir -p "${tmp_mount}"
-if mount -t devtmpfs none "${tmp_mount}" &> /dev/null; then
-	is_privileged=true
-	umount "${tmp_mount}"
-else
-	is_privileged=false
-fi
-rm -rf "${tmp_mount}"
-
-
-if [[ "${is_privileged}" == "true" ]]; then
-    # Since this container may also be run with CAP_SYS_ADMIN, ensure we can actually execute "udevadm trigger"
-    if [ ! -w /sys ]; then
-        # Disable supervisord script since we are not able to write to sysfs
-        echo "**** Disable udev - /sys is mounted RO ****";
-        sed -i 's|^autostart.*=.*$|autostart=false|' /etc/supervisor.d/udev.ini
-    elif [ ! -w /run/udev ]; then
-        # Disable supervisord script since we are not able to write to udev/data path
-        echo "**** Disable udev - /run/udev is mounted RO ****";
-        sed -i 's|^autostart.*=.*$|autostart=false|' /etc/supervisor.d/udev.ini
-    elif udevadm trigger &> /dev/null; then
-        echo "**** Configure container to run udev management ****";
-        # Enable supervisord script
-        sed -i 's|^autostart.*=.*$|autostart=true|' /etc/supervisor.d/udev.ini
-        # Configure udev permissions
-        if [[ -f /lib/udev/rules.d/60-steam-input.rules ]]; then
-            sed -i 's/MODE="0660"/MODE="0666"/' /lib/udev/rules.d/60-steam-input.rules
-        fi
-    else
-        # Disable supervisord script since we are not able to execute "udevadm trigger"
-        echo "**** Disable udev service due to privilege restrictions ****";
-        sed -i 's|^autostart.*=.*$|autostart=false|' /etc/supervisor.d/udev.ini
-    fi
-else
-    # Disable supervisord script
-    echo "**** Disable udev service ****";
+# Since this container may also be run with CAP_SYS_ADMIN, ensure we can actually execute "udevadm trigger"
+run_dumb_udev="false"
+if [ ! -w /sys ]; then
+    # Disable supervisord script since we are not able to write to sysfs
+    echo "**** Disable udevd - /sys is mounted RO ****";
     sed -i 's|^autostart.*=.*$|autostart=false|' /etc/supervisor.d/udev.ini
-    if [ ! -d /run/udev/data ]; then
-        echo "**** Enable dumb-udev service ****";
-        sed -i 's|^autostart.*=.*$|autostart=true|' /etc/supervisor.d/dumb-udev.ini
+    run_dumb_udev="true"
+elif [ ! -d /run/udev ]; then
+    # Disable supervisord script since we are not able to write to udev/data path
+    echo "**** Disable udevd - /run/udev does not exist ****";
+    sed -i 's|^autostart.*=.*$|autostart=false|' /etc/supervisor.d/udev.ini
+    run_dumb_udev="true"
+elif [ ! -w /run/udev ]; then
+    # Disable supervisord script since we are not able to write to udev/data path
+    echo "**** Disable udevd - /run/udev is mounted RO ****";
+    sed -i 's|^autostart.*=.*$|autostart=false|' /etc/supervisor.d/udev.ini
+    run_dumb_udev="false"
+elif udevadm trigger &> /dev/null; then
+    echo "**** Configure container to run udev management ****";
+    # Enable supervisord script
+    sed -i 's|^autostart.*=.*$|autostart=true|' /etc/supervisor.d/udev.ini
+    # Configure udev permissions
+    if [[ -f /lib/udev/rules.d/60-steam-input.rules ]]; then
+        sed -i 's/MODE="0660"/MODE="0666"/' /lib/udev/rules.d/60-steam-input.rules
     fi
+    run_dumb_udev="false"
+else
+    # Disable supervisord script since we are not able to execute "udevadm trigger"
+    echo "**** Disable udev service due to privilege restrictions ****";
+    sed -i 's|^autostart.*=.*$|autostart=false|' /etc/supervisor.d/udev.ini
+    run_dumb_udev="true"
+fi
+
+if [ "${run_dumb_udev}" = "true" ]; then
+    # Enable dumb-udev instead of udevd
+    echo "**** Enable dumb-udev service ****";
+    sed -i 's|^command.*=.*$|command=start-dumb-udev.sh|' /etc/supervisor.d/udev.ini
+    sed -i 's|^autostart.*=.*$|autostart=true|' /etc/supervisor.d/udev.ini
 fi
 
 

overlay/etc/supervisor.d/dumb-udev.ini

@@ -1,15 +0,0 @@
-
-[program:udev]
-priority=10
-autostart=false
-autorestart=true
-user=root
-directory=/
-command=start-dumb-udev.sh
-stopsignal=INT
-stdout_logfile=/var/log/supervisor/dumb-udev.log
-stdout_logfile_maxbytes=10MB
-stdout_logfile_backups=7
-stderr_logfile=/var/log/supervisor/dumb-udev.err.log
-stderr_logfile_maxbytes=10MB
-stderr_logfile_backups=7

overlay/usr/bin/common-functions.sh

@@ -28,7 +28,7 @@ wait_for_x() {
 wait_for_udev() {
     MAX=10
     CT=0
-    while [ ! -f /tmp/.started-udev ]; do
+    while [ ! -e /run/udev/control ]; do
         sleep 1
         CT=$(( CT + 1 ))
         if [ "$CT" -ge "$MAX" ]; then
@@ -36,6 +36,7 @@ wait_for_udev() {
             exit 11
         fi
     done
+    sleep 5
 }
 
 # Wait for dockerd to start

overlay/usr/bin/start-dumb-udev.sh

@@ -17,18 +17,10 @@ _term() {
 trap _term SIGTERM SIGINT
 
 
-# CONFIGURE:
-# Remove lockfile
-rm -f /tmp/.started-udev
-
-
 # EXECUTE PROCESS:
 # Start dumb-udev
-dumb-udev
+dumb-udev &
 dumb_udev_pid=$!
-# Touch lockfile
-sleep 1
-touch /tmp/.started-udev
 
 # WAIT FOR CHILD PROCESS:
 wait "$dumb_udev_pid"

overlay/usr/bin/start-udev.sh

@@ -16,12 +16,6 @@ _term() {
 }
 trap _term SIGTERM SIGINT
 
-
-# CONFIGURE:
-# Remove lockfile
-rm -f /tmp/.started-udev
-
-
 # EXECUTE PROCESS:
 # Start udev
 if command -v udevd &>/dev/null; then
@@ -32,9 +26,6 @@ fi
 # Monitor kernel uevents
 udevadm monitor &
 monitor_pid=$!
-# Touch lockfile
-sleep 1
-touch /tmp/.started-udev
 # Wait for 10 seconds, then request device events from the kernel
 sleep 10
 udevadm trigger