From 2d9cc9000bf1e22818f268055ab5ea943711c719 Mon Sep 17 00:00:00 2001
From: Calin Crisan <ccrisan@gmail.com>
Date: Sun, 16 Sep 2018 23:03:42 +0300
Subject: [PATCH 1/8] /etc/init.d/conf: remove unused has_net_conf() function

---
 board/common/overlay/etc/init.d/conf | 13 -------------
 1 file changed, 13 deletions(-)

diff --git a/board/common/overlay/etc/init.d/conf b/board/common/overlay/etc/init.d/conf
index fd1afc129c..39abf427ae 100644
--- a/board/common/overlay/etc/init.d/conf
+++ b/board/common/overlay/etc/init.d/conf
@@ -14,16 +14,3 @@ fi
 
 source $_conf
 
-has_net_conn() {
-    test "$os_networkless" == "true" && return 1
-
-    addr_eth=$(ip addr show dev $os_eth 2>/dev/null | grep inet | tr -s ' ' | sed -r 's/^\s+//' | cut -d ' ' -f 2)
-    addr_wlan=$(ip addr show dev $os_wlan 2>/dev/null | grep inet | tr -s ' ' | sed -r 's/^\s+//' | cut -d ' ' -f 2)
-
-    if [ -n "$addr_eth" ] || [ -n "$addr_wlan" ]; then
-        return 0
-    else
-        return 1
-    fi
-}
-

From 1484de1aba1f12bf7a312b516d78b6c5479c3292 Mon Sep 17 00:00:00 2001
From: Calin Crisan <ccrisan@gmail.com>
Date: Sun, 16 Sep 2018 23:13:08 +0300
Subject: [PATCH 2/8] init: include /etc/init.d/conf from base

---
 board/common/overlay/etc/init.d/S01mountall | 2 ++
 board/common/overlay/etc/init.d/S35wifi     | 1 -
 board/common/overlay/etc/init.d/S36ppp      | 1 -
 board/common/overlay/etc/init.d/S40network  | 1 -
 board/common/overlay/etc/init.d/S41netwatch | 1 -
 board/common/overlay/etc/init.d/S50date     | 1 -
 board/common/overlay/etc/init.d/S60sshd     | 1 -
 board/common/overlay/etc/init.d/S99showinfo | 1 -
 board/common/overlay/etc/init.d/base        | 7 +++++++
 9 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/board/common/overlay/etc/init.d/S01mountall b/board/common/overlay/etc/init.d/S01mountall
index bfde44d17b..829b974c64 100755
--- a/board/common/overlay/etc/init.d/S01mountall
+++ b/board/common/overlay/etc/init.d/S01mountall
@@ -29,6 +29,8 @@ mk_tty_login() {
 case "$1" in
     start)
         mount_fs
+
+        # we need to source conf again, now that /data is available
         test -n "$os_debug" || source /etc/init.d/conf
         test "$os_debug" == "true" && remount_rw
         mk_tty_login
diff --git a/board/common/overlay/etc/init.d/S35wifi b/board/common/overlay/etc/init.d/S35wifi
index 357ee80b56..828fc71d49 100755
--- a/board/common/overlay/etc/init.d/S35wifi
+++ b/board/common/overlay/etc/init.d/S35wifi
@@ -39,7 +39,6 @@ ssid=$(cat $conf | grep ssid | grep -v scan_ssid | cut -d '"' -f 2)
 test -n "$ssid" || exit 0
 
 test -n "$os_version" || source /etc/init.d/base
-test -n "$os_debug" || source /etc/init.d/conf
 
 test "$os_networkless" == "true" && exit 0
 
diff --git a/board/common/overlay/etc/init.d/S36ppp b/board/common/overlay/etc/init.d/S36ppp
index 01919e2281..7de9ee41ad 100755
--- a/board/common/overlay/etc/init.d/S36ppp
+++ b/board/common/overlay/etc/init.d/S36ppp
@@ -23,7 +23,6 @@ test -e $conf/modem || exit 0
 test -e $conf/apn || exit 0
 
 test -n "$os_version" || source /etc/init.d/base
-test -n "$os_debug" || source /etc/init.d/conf
 
 test "$os_networkless" == "true" && exit 0
 
diff --git a/board/common/overlay/etc/init.d/S40network b/board/common/overlay/etc/init.d/S40network
index a744bd1f9a..04328cfb5d 100755
--- a/board/common/overlay/etc/init.d/S40network
+++ b/board/common/overlay/etc/init.d/S40network
@@ -22,7 +22,6 @@ fi
 test -r $static_conf && source $static_conf
 
 test -n "$os_version" || source /etc/init.d/base
-test -n "$os_debug" || source /etc/init.d/conf
 
 watch_eth() {
     count=0
diff --git a/board/common/overlay/etc/init.d/S41netwatch b/board/common/overlay/etc/init.d/S41netwatch
index c7421d72f8..2ec59f483a 100755
--- a/board/common/overlay/etc/init.d/S41netwatch
+++ b/board/common/overlay/etc/init.d/S41netwatch
@@ -12,7 +12,6 @@ if [ -z "$netwatch_host" ] || [ -z "$netwatch_port" ]; then
 fi
 
 test -n "$os_version" || source /etc/init.d/base
-test -n "$os_debug" || source /etc/init.d/conf
 
 test "$os_networkless" == "true" && exit 0
 
diff --git a/board/common/overlay/etc/init.d/S50date b/board/common/overlay/etc/init.d/S50date
index 695d694bb8..87464d368c 100755
--- a/board/common/overlay/etc/init.d/S50date
+++ b/board/common/overlay/etc/init.d/S50date
@@ -30,7 +30,6 @@ fi
 test -f $conf || exit 0
 
 test -n "$os_version" || source /etc/init.d/base
-test -n "$os_debug" || source /etc/init.d/conf
 
 test "$os_networkless" == "true" && exit 0
 
diff --git a/board/common/overlay/etc/init.d/S60sshd b/board/common/overlay/etc/init.d/S60sshd
index 37546b1161..2dcd04ac7b 100755
--- a/board/common/overlay/etc/init.d/S60sshd
+++ b/board/common/overlay/etc/init.d/S60sshd
@@ -5,7 +5,6 @@ conf="/etc/sshd_config"
 test -f $conf || exit 0
 
 test -n "$os_version" || source /etc/init.d/base
-test -n "$os_debug" || source /etc/init.d/conf
 
 test "$os_networkless" == "true" && exit 0
 
diff --git a/board/common/overlay/etc/init.d/S99showinfo b/board/common/overlay/etc/init.d/S99showinfo
index 1e0b7390d1..fac00a387d 100755
--- a/board/common/overlay/etc/init.d/S99showinfo
+++ b/board/common/overlay/etc/init.d/S99showinfo
@@ -1,7 +1,6 @@
 #!/bin/bash
 
 test -n "$os_version" || source /etc/init.d/base
-test -n "$os_debug" || source /etc/init.d/conf
 
 msg_info() {
     echo " # $1"
diff --git a/board/common/overlay/etc/init.d/base b/board/common/overlay/etc/init.d/base
index 11a5ef95eb..ef900a8955 100755
--- a/board/common/overlay/etc/init.d/base
+++ b/board/common/overlay/etc/init.d/base
@@ -4,6 +4,8 @@ source /etc/version
 board_sn=$(/etc/init.d/boardsn)
 board_name=$(cat /etc/board)
 
+test -n "$os_debug" || source /etc/init.d/conf
+
 msg_begin() {
     echo -n " * $1: "
 }
@@ -20,3 +22,8 @@ msg_background() {
     test -n "$1" && echo $1 || echo "pending"
 }
 
+panic_action() {
+    logger -t panic -s "rebooting"
+    /sbin/reboot
+}
+

From 4f47cacd837f50f20943384f18ee616e38df11d5 Mon Sep 17 00:00:00 2001
From: Calin Crisan <ccrisan@gmail.com>
Date: Sun, 16 Sep 2018 23:19:20 +0300
Subject: [PATCH 3/8] init: replace reboots with calls to panic_action

---
 board/common/overlay/etc/init.d/S33hostapd   |  4 ++--
 board/common/overlay/etc/init.d/S35wifi      |  4 ++--
 board/common/overlay/etc/init.d/S36ppp       |  4 ++--
 board/common/overlay/etc/init.d/S37bluetooth |  4 ++--
 board/common/overlay/etc/init.d/S40network   | 12 ++++++------
 board/common/overlay/etc/init.d/S41netwatch  |  4 ++--
 6 files changed, 16 insertions(+), 16 deletions(-)

diff --git a/board/common/overlay/etc/init.d/S33hostapd b/board/common/overlay/etc/init.d/S33hostapd
index 82e74bd0b1..bbdb797ff0 100755
--- a/board/common/overlay/etc/init.d/S33hostapd
+++ b/board/common/overlay/etc/init.d/S33hostapd
@@ -34,8 +34,8 @@ watch() {
     while true; do
         sleep 5
         if ! running; then
-            logger -t hostapd -s "dead, rebooting"
-            reboot
+            logger -t hostapd -s "dead, calling panic action"
+            panic_action hostapd
             break
         fi
     done
diff --git a/board/common/overlay/etc/init.d/S35wifi b/board/common/overlay/etc/init.d/S35wifi
index 828fc71d49..67d07047b6 100755
--- a/board/common/overlay/etc/init.d/S35wifi
+++ b/board/common/overlay/etc/init.d/S35wifi
@@ -57,8 +57,8 @@ watch() {
                 count=$(($count + 5))
                 logger -t wifi -s "disconnected"
             else
-                logger -t wifi -s "disconnected for $link_watch_timeout seconds, rebooting"
-                reboot
+                logger -t wifi -s "disconnected for $link_watch_timeout seconds, calling panic action"
+                panic_action wifi
             fi
         fi
     done
diff --git a/board/common/overlay/etc/init.d/S36ppp b/board/common/overlay/etc/init.d/S36ppp
index 7de9ee41ad..b3dc0be5c6 100755
--- a/board/common/overlay/etc/init.d/S36ppp
+++ b/board/common/overlay/etc/init.d/S36ppp
@@ -41,8 +41,8 @@ watch() {
                 count=$(($count + 5))
                 logger -t ppp -s "disconnected"
             else
-                logger -t ppp -s "disconnected for $link_watch_timeout seconds, rebooting"
-                reboot
+                logger -t ppp -s "disconnected for $link_watch_timeout seconds, calling panic action"
+                panic_action ppp
             fi
         fi
     done
diff --git a/board/common/overlay/etc/init.d/S37bluetooth b/board/common/overlay/etc/init.d/S37bluetooth
index 0e9a03c807..1e61009058 100755
--- a/board/common/overlay/etc/init.d/S37bluetooth
+++ b/board/common/overlay/etc/init.d/S37bluetooth
@@ -48,8 +48,8 @@ start() {
         count=$(($count + 1))
         if [ $count -ge 10 ]; then
             msg_fail "no device"
-            logger -t bluetooth -s "bluetooth device not available, rebooting"
-            reboot
+            logger -t bluetooth -s "bluetooth device not available, calling panic action"
+            panic_action bluetooth
             return 1
         fi
     done
diff --git a/board/common/overlay/etc/init.d/S40network b/board/common/overlay/etc/init.d/S40network
index 04328cfb5d..010329219a 100755
--- a/board/common/overlay/etc/init.d/S40network
+++ b/board/common/overlay/etc/init.d/S40network
@@ -34,8 +34,8 @@ watch_eth() {
                 count=$(($count + 5))
                 logger -t ethernet -s "disconnected"
             else
-                logger -t ethernet -s "disconnected for $link_watch_timeout seconds, rebooting"
-                reboot
+                logger -t ethernet -s "disconnected for $link_watch_timeout seconds, calling panic action"
+                panic_action network
             fi
         fi
     done
@@ -53,8 +53,8 @@ watch_ip() {
                 count=$(($count + 5))
                 logger -t network -s "$iface has no IP address"
             else
-                logger -t network -s "$iface had no IP address for $ip_watch_timeout seconds, rebooting"
-                reboot
+                logger -t network -s "$iface had no IP address for $ip_watch_timeout seconds, calling panic action"
+                panic_action network
             fi
         fi
     done
@@ -180,8 +180,8 @@ start() {
     
     if [ "$eth_ok" != "ok" ] && [ "$wlan_ok" != "ok" ] && [ "$ppp_ok" != "ok" ]; then
         if [ "$link_watch" == "true" ]; then
-            logger -t network -s "no network connection available, rebooting"
-            reboot
+            logger -t network -s "no network connection available, calling panic action"
+            panic_action network
             return 1
         else
             logger -t network -s "no network connection available"
diff --git a/board/common/overlay/etc/init.d/S41netwatch b/board/common/overlay/etc/init.d/S41netwatch
index 2ec59f483a..2abd6433c6 100755
--- a/board/common/overlay/etc/init.d/S41netwatch
+++ b/board/common/overlay/etc/init.d/S41netwatch
@@ -28,8 +28,8 @@ watch() {
                 count=$(($count + 1))
                 continue
             else
-                logger -t netwatch -s "cannot connect to $netwatch_host:$netwatch_port, rebooting"
-                reboot
+                logger -t netwatch -s "cannot connect to $netwatch_host:$netwatch_port, calling panic action"
+                panic_action netwatch
             fi
         fi
     done

From fda8329f209414bb5a5df52bfb6b7885d2bea99c Mon Sep 17 00:00:00 2001
From: Calin Crisan <ccrisan@gmail.com>
Date: Mon, 15 Oct 2018 23:45:11 +0300
Subject: [PATCH 4/8] add bootdone init script

---
 board/common/overlay/etc/init.d/bootdone | 7 +++++++
 board/common/overlay/etc/init.d/rcS      | 2 +-
 2 files changed, 8 insertions(+), 1 deletion(-)
 create mode 100755 board/common/overlay/etc/init.d/bootdone

diff --git a/board/common/overlay/etc/init.d/bootdone b/board/common/overlay/etc/init.d/bootdone
new file mode 100755
index 0000000000..14ca681cfc
--- /dev/null
+++ b/board/common/overlay/etc/init.d/bootdone
@@ -0,0 +1,7 @@
+#!/bin/bash
+
+source /etc/init.d/panic
+
+# reset panic counter after a successful boot
+echo 0 > ${_PANIC_COUNTER_FILE}
+
diff --git a/board/common/overlay/etc/init.d/rcS b/board/common/overlay/etc/init.d/rcS
index 5f0d70cc09..22fa4ac98f 100755
--- a/board/common/overlay/etc/init.d/rcS
+++ b/board/common/overlay/etc/init.d/rcS
@@ -10,7 +10,7 @@ echo "---- booting $os_name $os_version ----" >> $tmp_boot_log
 
 # start all init scripts in /etc/init.d,
 # executing them in numerical order.
-(for i in /etc/init.d/S??*; do
+(for i in /etc/init.d/S??* /etc/init.d/bootdone; do
     [ ! -x "$i" ] && continue
     [ -f /data/etc/no_$(basename $i) ] && continue
     $i start || break

From 0c5ce8c19ffc253cda90bfd96c62e604ae7c36f6 Mon Sep 17 00:00:00 2001
From: Calin Crisan <ccrisan@gmail.com>
Date: Mon, 15 Oct 2018 23:45:38 +0300
Subject: [PATCH 5/8] add panic init script

---
 board/common/overlay/etc/init.d/base  |  7 ++-----
 board/common/overlay/etc/init.d/panic | 28 +++++++++++++++++++++++++++
 board/common/overlay/sbin/reboot      | 10 +++++++++-
 3 files changed, 39 insertions(+), 6 deletions(-)
 create mode 100755 board/common/overlay/etc/init.d/panic

diff --git a/board/common/overlay/etc/init.d/base b/board/common/overlay/etc/init.d/base
index ef900a8955..7b08c9384d 100755
--- a/board/common/overlay/etc/init.d/base
+++ b/board/common/overlay/etc/init.d/base
@@ -6,6 +6,8 @@ board_name=$(cat /etc/board)
 
 test -n "$os_debug" || source /etc/init.d/conf
 
+source /etc/init.d/panic
+
 msg_begin() {
     echo -n " * $1: "
 }
@@ -22,8 +24,3 @@ msg_background() {
     test -n "$1" && echo $1 || echo "pending"
 }
 
-panic_action() {
-    logger -t panic -s "rebooting"
-    /sbin/reboot
-}
-
diff --git a/board/common/overlay/etc/init.d/panic b/board/common/overlay/etc/init.d/panic
new file mode 100755
index 0000000000..e0d288d0d6
--- /dev/null
+++ b/board/common/overlay/etc/init.d/panic
@@ -0,0 +1,28 @@
+#!/bin/bash
+
+_PANIC_COUNTER_FILE="/var/lib/panic_counter"
+_PANIC_REBOOT_DELAY_FACTOR=10
+_PANIC_REBOOT_DELAY_MAX=3600  # reboot at least once an hour in case of panic
+
+
+panic_action() {
+    # read counter from file
+    panic_counter=$(cat ${_PANIC_COUNTER_FILE} 2>/dev/null || echo 0)
+    
+    # write increased counter back to file
+    echo $((panic_counter + 1)) > ${_PANIC_COUNTER_FILE}
+    
+    delay=$((_PANIC_REBOOT_DELAY_FACTOR * panic_counter))
+    if [ "${delay}" -gt "${_PANIC_REBOOT_DELAY_MAX}" ]; then
+        delay=${_PANIC_REBOOT_DELAY_MAX}
+    fi
+    
+    if [ "${delay}" -gt 0 ]; then
+        logger -t panic -s "rebooting in ${delay} seconds (caused by $1)"
+        sleep ${delay}
+    fi
+
+    logger -t panic -s "rebooting (caused by $1)"
+    /sbin/reboot
+}
+
diff --git a/board/common/overlay/sbin/reboot b/board/common/overlay/sbin/reboot
index 5278c19d34..3b214bdd85 100755
--- a/board/common/overlay/sbin/reboot
+++ b/board/common/overlay/sbin/reboot
@@ -1,7 +1,15 @@
 #!/bin/bash
 
+# carry on with the script in case of error
 set +e
+
+# write buffers to disk
 /bin/sync
-(sleep 10 && /usr/bin/killall -STOP watchdog) &
+
+# allow the shutdown script 20 seconds to shut down,
+# after which we stop feeding the watchdog
+(sleep 20 && /usr/bin/killall -STOP watchdog) &
+
+# actual reboot command
 /bin/busybox reboot
 

From 5281a3dfe6a49294779f44bacc78a16e41d45247 Mon Sep 17 00:00:00 2001
From: Calin Crisan <ccrisan@gmail.com>
Date: Mon, 15 Oct 2018 23:46:08 +0300
Subject: [PATCH 6/8] datapart init script: do not do anything at stop

---
 board/common/overlay/etc/init.d/S00datapart | 38 ++++++++++-----------
 1 file changed, 18 insertions(+), 20 deletions(-)

diff --git a/board/common/overlay/etc/init.d/S00datapart b/board/common/overlay/etc/init.d/S00datapart
index 63582b5fe7..b971503039 100755
--- a/board/common/overlay/etc/init.d/S00datapart
+++ b/board/common/overlay/etc/init.d/S00datapart
@@ -2,26 +2,26 @@
 
 test -n "$os_version" || source /etc/init.d/base
 
-msg_begin "Detecting disk device"
-root_dev=$(cat /proc/cmdline | grep -oE 'root=[/a-z0-9]+' | cut -d '=' -f 2)
-if [[ "$root_dev" =~ ^([/a-z0-9]+)(p[0-9])$ ]]; then  # e.g. /dev/mmcblk0p2
-    disk_dev=${BASH_REMATCH[1]}
-    boot_dev=${disk_dev}p1
-    data_dev=${disk_dev}p3
-elif [[ "$root_dev" =~ ^([/a-z0-9]+)([0-9])$ ]]; then  # e.g. /dev/sdc2
-    disk_dev=${BASH_REMATCH[1]}
-    boot_dev=${disk_dev}1
-    data_dev=${disk_dev}3
-else
-    msg_fail "unknown ($root_dev)"
-    exit 1
-fi
-msg_done "$disk_dev"
-
-test -b $data_dev && exit 0
-
 case "$1" in
     start)
+        msg_begin "Detecting disk device"
+        root_dev=$(cat /proc/cmdline | grep -oE 'root=[/a-z0-9]+' | cut -d '=' -f 2)
+        if [[ "$root_dev" =~ ^([/a-z0-9]+)(p[0-9])$ ]]; then  # e.g. /dev/mmcblk0p2
+            disk_dev=${BASH_REMATCH[1]}
+            boot_dev=${disk_dev}p1
+            data_dev=${disk_dev}p3
+        elif [[ "$root_dev" =~ ^([/a-z0-9]+)([0-9])$ ]]; then  # e.g. /dev/sdc2
+            disk_dev=${BASH_REMATCH[1]}
+            boot_dev=${disk_dev}1
+            data_dev=${disk_dev}3
+        else
+            msg_fail "unknown ($root_dev)"
+            exit 1
+        fi
+        msg_done "$disk_dev"
+
+        test -b $data_dev && exit 0
+
         msg_begin "Creating data partition"
         root_end=$(partx -s -g -o END $root_dev)
         data_start=$(($root_end + 1))
@@ -68,5 +68,3 @@ case "$1" in
         exit 1
 esac
 
-# always exit with a successful status
-exit 0

From cf57e4b483e70c050c1390416a3b4c22afcb6a72 Mon Sep 17 00:00:00 2001
From: Calin Crisan <ccrisan@gmail.com>
Date: Tue, 16 Oct 2018 22:45:23 +0300
Subject: [PATCH 7/8] init: fix conf script sourcing when no data partition
 available

---
 board/common/overlay/etc/init.d/conf | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/board/common/overlay/etc/init.d/conf b/board/common/overlay/etc/init.d/conf
index 39abf427ae..dc71091fb9 100644
--- a/board/common/overlay/etc/init.d/conf
+++ b/board/common/overlay/etc/init.d/conf
@@ -4,6 +4,17 @@ _sys_conf="/etc/os.conf"
 _boot_conf="/boot/os.conf"
 _conf="/data/etc/os.conf"
 
+if ! [ -d /data/etc ]; then
+    # use boot/system variants if we don't have the data partition mounted
+    if [ -f $_boot_conf ]; then
+        source $_boot_conf
+    elif [ -f $_sys_conf ]; then
+        source $_sys_conf
+    fi
+
+    return
+fi
+
 if ! [ -f $_conf ]; then
     if [ -f $_boot_conf ]; then
         cp $_boot_conf $_conf
@@ -12,5 +23,7 @@ if ! [ -f $_conf ]; then
     fi
 fi
 
-source $_conf
+if [ -f $_conf ]; then
+    source $_conf
+fi
 

From c9ef303908fdf2bfb9a40869ec5e664b61094476 Mon Sep 17 00:00:00 2001
From: Calin Crisan <ccrisan@gmail.com>
Date: Tue, 16 Oct 2018 23:08:14 +0300
Subject: [PATCH 8/8] init: use [[ cond ]] bash ifs

---
 board/common/overlay/etc/init.d/S01mountall   |  2 +-
 board/common/overlay/etc/init.d/S02modules    |  4 +-
 board/common/overlay/etc/init.d/S03hostname   |  8 ++--
 .../common/overlay/etc/init.d/S14postupgrade  |  4 +-
 board/common/overlay/etc/init.d/S33hostapd    | 10 ++--
 board/common/overlay/etc/init.d/S35wifi       | 20 ++++----
 board/common/overlay/etc/init.d/S36ppp        | 18 +++----
 board/common/overlay/etc/init.d/S37bluetooth  |  8 ++--
 board/common/overlay/etc/init.d/S40network    | 48 +++++++++----------
 board/common/overlay/etc/init.d/S41netwatch   |  4 +-
 board/common/overlay/etc/init.d/S43firewall   |  6 +--
 board/common/overlay/etc/init.d/S45dnsmasq    |  6 +--
 board/common/overlay/etc/init.d/S50date       | 18 +++----
 board/common/overlay/etc/init.d/S51crond      |  2 +-
 board/common/overlay/etc/init.d/conf          | 14 +++---
 board/common/overlay/etc/init.d/panic         |  4 +-
 board/common/overlay/etc/init.d/rcK           |  4 +-
 board/common/overlay/etc/init.d/rcS           |  4 +-
 .../raspberrypi/overlay/etc/init.d/S05cpufreq |  2 +-
 .../overlay/etc/init.d/S11throttlewatch       |  4 +-
 .../raspberrypi/overlay/etc/init.d/S13btuart  |  4 +-
 .../overlay/etc/init.d/S05cpufreq             |  2 +-
 .../overlay/etc/init.d/S11throttlewatch       |  4 +-
 .../overlay/etc/init.d/S05cpufreq             |  2 +-
 .../overlay/etc/init.d/S11throttlewatch       |  4 +-
 .../raspberrypi3/overlay/etc/init.d/S13btuart |  4 +-
 26 files changed, 105 insertions(+), 105 deletions(-)

diff --git a/board/common/overlay/etc/init.d/S01mountall b/board/common/overlay/etc/init.d/S01mountall
index 829b974c64..71065f714d 100755
--- a/board/common/overlay/etc/init.d/S01mountall
+++ b/board/common/overlay/etc/init.d/S01mountall
@@ -6,7 +6,7 @@ mount_fs() {
     msg_begin "Mounting filesystems"
     /bin/mount -T /etc/fstab.disk -a &&
     /bin/mount -T /etc/fstab.extra -a &&
-    if [ -r /data/etc/fstab.user ]; then /bin/mount -T /data/etc/fstab.user -a; fi
+    if [[ -r /data/etc/fstab.user ]]; then /bin/mount -T /data/etc/fstab.user -a; fi
 
     test $? == 0 && msg_done || msg_fail
 }
diff --git a/board/common/overlay/etc/init.d/S02modules b/board/common/overlay/etc/init.d/S02modules
index 8e1b5a9fd8..685f63a5fb 100755
--- a/board/common/overlay/etc/init.d/S02modules
+++ b/board/common/overlay/etc/init.d/S02modules
@@ -9,11 +9,11 @@ case "$1" in
     start)
         msg_begin "Loading kernel modules"
 
-        if [ -r $sys_modules_file ]; then
+        if [[ -r $sys_modules_file ]]; then
             cat $sys_modules_file | while read line; do test -n "$line" && /sbin/modprobe $line &>/dev/null; done
         fi
 
-        if [ -r $modules_file ]; then
+        if [[ -r $modules_file ]]; then
             cat $modules_file | while read line; do test -n "$line" && /sbin/modprobe $line &>/dev/null; done
         fi
 
diff --git a/board/common/overlay/etc/init.d/S03hostname b/board/common/overlay/etc/init.d/S03hostname
index dc1a56e345..8b886e838d 100755
--- a/board/common/overlay/etc/init.d/S03hostname
+++ b/board/common/overlay/etc/init.d/S03hostname
@@ -10,15 +10,15 @@ case "$1" in
     start)
         msg_begin "Setting hostname"
 
-        if ! [ -f $hostname_file ]; then
-            if [ -f $boot_hostname_file ]; then
+        if ! [[ -f $hostname_file ]]; then
+            if [[ -f $boot_hostname_file ]]; then
                 cp $boot_hostname_file $hostname_file
-            elif [ -f $sys_hostname_file ]; then
+            elif [[ -f $sys_hostname_file ]]; then
                 cp $sys_hostname_file $hostname_file
             fi
         fi
 
-        if [ -f $hostname_file ]; then
+        if [[ -f $hostname_file ]]; then
             hostname=$(cat $hostname_file)
         else
             hostname="$os_prefix-$board_sn"
diff --git a/board/common/overlay/etc/init.d/S14postupgrade b/board/common/overlay/etc/init.d/S14postupgrade
index 0765d72b76..65c0adf96b 100755
--- a/board/common/overlay/etc/init.d/S14postupgrade
+++ b/board/common/overlay/etc/init.d/S14postupgrade
@@ -16,7 +16,7 @@ test "$hash" == "$sys_hash" && exit 0
 test -d $post_upgrade_dir || exit 0
 
 function version_gt() {
-    if [ "$1" != "$2" ] && [ $(echo -e "$2\n$1" | sort -t . | head -n 1) == "$2" ]; then
+    if [[ "$1" != "$2" ]] && [[ $(echo -e "$2\n$1" | sort -t . | head -n 1) == "$2" ]]; then
         return 0
     else
         return 1
@@ -29,7 +29,7 @@ function run_post_upgrade() {
 
     versions=$(ls -1 $post_upgrade_dir | cut -d '.' -f 1)
     for v in $versions; do
-        if [ -z "$version" ] || version_gt $v $version; then
+        if [[ -z "$version" ]] || version_gt $v $version; then
             msg_begin "Post-upgrading to version $v"
             out=$($post_upgrade_dir/$v.sh 2>&1)
             test $? == 0 && msg_done || msg_fail
diff --git a/board/common/overlay/etc/init.d/S33hostapd b/board/common/overlay/etc/init.d/S33hostapd
index bbdb797ff0..b8d6759589 100755
--- a/board/common/overlay/etc/init.d/S33hostapd
+++ b/board/common/overlay/etc/init.d/S33hostapd
@@ -14,10 +14,10 @@ link_watch_timeout=20
 
 test -f $watch_conf && source $watch_conf
 
-if ! [ -f $conf ]; then
-    if [ -f $boot_conf ]; then
+if ! [[ -f $conf ]]; then
+    if [[ -f $boot_conf ]]; then
         cp $boot_conf $conf
-    elif [ -f $sys_conf ]; then
+    elif [[ -f $sys_conf ]]; then
         cp $sys_conf $conf
     fi
 fi
@@ -49,7 +49,7 @@ start() {
     while ! ifconfig $iface >/dev/null 2>&1; do
         sleep 1
         count=$(($count + 1))
-        if [ $count -ge 5 ]; then
+        if [[ $count -ge 5 ]]; then
             msg_fail "no device"
             return 1
         fi
@@ -61,7 +61,7 @@ start() {
     iwconfig $iface power off &> /dev/null
     $prog $conf &> $log &
 
-    if [ "$link_watch" == "yes" ]; then
+    if [[ "$link_watch" == "yes" ]]; then
         watch &
     fi
 
diff --git a/board/common/overlay/etc/init.d/S35wifi b/board/common/overlay/etc/init.d/S35wifi
index 67d07047b6..7ab6635531 100755
--- a/board/common/overlay/etc/init.d/S35wifi
+++ b/board/common/overlay/etc/init.d/S35wifi
@@ -12,20 +12,20 @@ sys_watch_conf="/etc/watch.conf"
 boot_watch_conf="/boot/watch.conf"
 watch_conf="/data/etc/watch.conf"
 
-if ! [ -f $watch_conf ]; then
-    if [ -f $boot_watch_conf ]; then
+if ! [[ -f $watch_conf ]]; then
+    if [[ -f $boot_watch_conf ]]; then
         cp $boot_watch_conf $watch_conf
-    elif [ -f $sys_watch_conf ]; then
+    elif [[ -f $sys_watch_conf ]]; then
         cp $sys_watch_conf $watch_conf
     fi
 fi
 
 source $watch_conf
 
-if ! [ -f $conf ]; then
-    if [ -f $boot_conf ]; then
+if ! [[ -f $conf ]]; then
+    if [[ -f $boot_conf ]]; then
         cp $boot_conf $conf
-    elif [ -f $sys_conf ]; then
+    elif [[ -f $sys_conf ]]; then
         cp $sys_conf $conf
     fi
 fi
@@ -53,7 +53,7 @@ watch() {
         if connected; then
             count=0
         else
-            if [ $count -lt $link_watch_timeout ]; then
+            if [[ $count -lt $link_watch_timeout ]]; then
                 count=$(($count + 5))
                 logger -t wifi -s "disconnected"
             else
@@ -74,7 +74,7 @@ start() {
     while ! ifconfig $os_wlan >/dev/null 2>&1; do
         sleep 1
         count=$(($count + 1))
-        if [ $count -ge 5 ]; then
+        if [[ $count -ge 5 ]]; then
             msg_fail "no device"
             return 1
         fi
@@ -93,7 +93,7 @@ start() {
             break
         fi
 
-        if [ $count -gt $link_watch_timeout ] || ! pidof wpa_supplicant > /dev/null; then
+        if [[ $count -gt $link_watch_timeout ]] || ! pidof wpa_supplicant > /dev/null; then
             test -n "$module" && msg_fail "failed ($module)"|| msg_fail
             return 1
         fi
@@ -101,7 +101,7 @@ start() {
         count=$(($count + 1))
     done
 
-    if [ "$link_watch" == "true" ]; then
+    if [[ "$link_watch" == "true" ]]; then
         watch &
     fi
 
diff --git a/board/common/overlay/etc/init.d/S36ppp b/board/common/overlay/etc/init.d/S36ppp
index b3dc0be5c6..c67f7253e6 100755
--- a/board/common/overlay/etc/init.d/S36ppp
+++ b/board/common/overlay/etc/init.d/S36ppp
@@ -11,10 +11,10 @@ watch_conf="/data/etc/watch.conf"
 
 source $watch_conf
 
-if ! [ -d $conf ]; then
-    if [ -d $boot_conf ]; then
+if ! [[ -d $conf ]]; then
+    if [[ -d $boot_conf ]]; then
         cp -r $boot_conf $conf
-    elif [ -d $sys_conf ]; then
+    elif [[ -d $sys_conf ]]; then
         cp -r $sys_conf $conf
     fi
 fi
@@ -37,7 +37,7 @@ watch() {
         if connected; then
             count=0
         else
-            if [ $count -lt $link_watch_timeout ]; then
+            if [[ $count -lt $link_watch_timeout ]]; then
                 count=$(($count + 5))
                 logger -t ppp -s "disconnected"
             else
@@ -64,13 +64,13 @@ start() {
 
     # wait for modem
     modem=$(head -n 1 $conf/modem)
-    if ! [ -e /dev/$modem ]; then
+    if ! [[ -e /dev/$modem ]]; then
         udev_trigger_add 4 &
     fi
 
     count=0
     while true; do
-        if [ -e /dev/$modem ] || [ $count -gt $link_watch_timeout ]; then
+        if [[ -e /dev/$modem ]] || [[ $count -gt $link_watch_timeout ]]; then
             break
         fi
 
@@ -78,7 +78,7 @@ start() {
         sleep 1
     done
 
-    if ! [ -e /dev/$modem ]; then
+    if ! [[ -e /dev/$modem ]]; then
         msg_fail "modem /dev/$modem not present"
         return
     fi
@@ -92,7 +92,7 @@ start() {
             break
         fi
 
-        if [ $count -gt $link_watch_timeout ] || ! pidof pppd > /dev/null; then
+        if [[ $count -gt $link_watch_timeout ]] || ! pidof pppd > /dev/null; then
             msg_fail
             return
         fi
@@ -100,7 +100,7 @@ start() {
         count=$(($count + 1))
     done
 
-    if [ "$link_watch" == "true" ]; then
+    if [[ "$link_watch" == "true" ]]; then
         watch &
     fi
 
diff --git a/board/common/overlay/etc/init.d/S37bluetooth b/board/common/overlay/etc/init.d/S37bluetooth
index 1e61009058..76e570ab00 100755
--- a/board/common/overlay/etc/init.d/S37bluetooth
+++ b/board/common/overlay/etc/init.d/S37bluetooth
@@ -4,10 +4,10 @@ sys_conf="/etc/bluetooth.conf"
 boot_conf="/boot/bluetooth.conf"
 conf="/data/etc/bluetooth.conf"
 
-if ! [ -f $conf ]; then
-    if [ -f $boot_conf ]; then
+if ! [[ -f $conf ]]; then
+    if [[ -f $boot_conf ]]; then
         cp $boot_conf $conf
-    elif [ -f $sys_conf ]; then
+    elif [[ -f $sys_conf ]]; then
         cp $sys_conf $conf
     fi
 fi
@@ -46,7 +46,7 @@ start() {
     while ! hciconfig $hci &>/dev/null; do
         sleep 1
         count=$(($count + 1))
-        if [ $count -ge 10 ]; then
+        if [[ $count -ge 10 ]]; then
             msg_fail "no device"
             logger -t bluetooth -s "bluetooth device not available, calling panic action"
             panic_action bluetooth
diff --git a/board/common/overlay/etc/init.d/S40network b/board/common/overlay/etc/init.d/S40network
index 010329219a..93b03c81af 100755
--- a/board/common/overlay/etc/init.d/S40network
+++ b/board/common/overlay/etc/init.d/S40network
@@ -11,10 +11,10 @@ link_nego_timeout=10
 
 source $watch_conf
 
-if ! [ -f $static_conf ]; then
-    if [ -f $boot_static_conf ]; then
+if ! [[ -f $static_conf ]]; then
+    if [[ -f $boot_static_conf ]]; then
         cp $boot_static_conf $static_conf
-    elif [ -f $sys_static_conf ]; then
+    elif [[ -f $sys_static_conf ]]; then
         cp $sys_static_conf $static_conf
     fi
 fi
@@ -27,10 +27,10 @@ watch_eth() {
     count=0
     while true; do
         sleep 5
-        if [ "$(cat /sys/class/net/$os_eth/operstate 2>/dev/null)" == "up" ]; then
+        if [[ "$(cat /sys/class/net/$os_eth/operstate 2>/dev/null)" == "up" ]]; then
             count=0
         else
-            if [ $count -lt $link_watch_timeout ]; then
+            if [[ $count -lt $link_watch_timeout ]]; then
                 count=$(($count + 5))
                 logger -t ethernet -s "disconnected"
             else
@@ -49,7 +49,7 @@ watch_ip() {
         if ip addr show dev $iface | grep inet &>/dev/null; then
             count=0
         else
-            if [ $count -lt $ip_watch_timeout ]; then
+            if [[ $count -lt $ip_watch_timeout ]]; then
                 count=$(($count + 5))
                 logger -t network -s "$iface has no IP address"
             else
@@ -71,16 +71,16 @@ start_wlan() {
         return 1
     fi
 
-    if [ "$(cat /sys/class/net/$os_wlan/carrier 2>/dev/null)" != "1" ]; then
+    if [[ "$(cat /sys/class/net/$os_wlan/carrier 2>/dev/null)" != "1" ]]; then
         msg_fail "no link"
         return 1
     fi
 
-    if [ -n "$mtu" ]; then
+    if [[ -n "$mtu" ]]; then
         ip link set mtu $mtu dev $os_wlan
     fi
 
-    if [ -n "$static_ip" ]; then
+    if [[ -n "$static_ip" ]]; then
         msg_done $static_ip
         ifconfig $os_wlan $static_ip up
         static_ip="" # won't be used again
@@ -89,7 +89,7 @@ start_wlan() {
         dhclient -cf "$dh_conf" $os_wlan
     fi
 
-    if [ "$ip_watch" == "true" ] && ip addr show dev $os_wlan | grep inet &>/dev/null; then
+    if [[ "$ip_watch" == "true" ]] && ip addr show dev $os_wlan | grep inet &>/dev/null; then
         watch_ip $os_wlan &
     fi
 }
@@ -103,7 +103,7 @@ start_eth() {
     while ! ifconfig $os_eth >/dev/null 2>&1; do
         sleep 1
         count=$(($count + 1))
-        if [ $count -ge $w ]; then
+        if [[ $count -ge $w ]]; then
             msg_done "no device"
             return 1
         fi
@@ -115,10 +115,10 @@ start_eth() {
     # wait for operstate
     w=3
     count=0
-    while [ "$(cat /sys/class/net/$os_eth/operstate 2>&1)" == "unknown" ]; do
+    while [[ "$(cat /sys/class/net/$os_eth/operstate 2>&1)" == "unknown" ]]; do
         sleep 1
         count=$(($count + 1))
-        if [ $count -ge $w ]; then
+        if [[ $count -ge $w ]]; then
             msg_done "no link"
             return 1
         fi
@@ -127,20 +127,20 @@ start_eth() {
     # wait for link
     test "$link_watch" == "true" || link_nego_timeout=5
     count=0
-    while [ "$(cat /sys/class/net/$os_eth/carrier 2>&1)" != "1" ]; do
+    while [[ "$(cat /sys/class/net/$os_eth/carrier 2>&1)" != "1" ]]; do
         sleep 1
         count=$(($count + 1))
-        if [ $count -ge $link_nego_timeout ]; then
+        if [[ $count -ge $link_nego_timeout ]]; then
             msg_done "no link"
             return 1
         fi
     done
     
-    if [ -n "$mtu" ]; then
+    if [[ -n "$mtu" ]]; then
         ip link set mtu $mtu dev $os_eth
     fi
 
-    if [ -n "$static_ip" ]; then
+    if [[ -n "$static_ip" ]]; then
         msg_done $static_ip
         ifconfig $os_eth $static_ip up
         static_ip="" # won't be used again
@@ -149,11 +149,11 @@ start_eth() {
         dhclient -cf "$dh_conf" $os_eth
     fi
 
-    if [ "$link_watch" == "true" ]; then
+    if [[ "$link_watch" == "true" ]]; then
         watch_eth &
     fi
 
-    if [ "$ip_watch" == "true" ] && ip addr show dev $os_eth | grep inet &>/dev/null; then
+    if [[ "$ip_watch" == "true" ]] && ip addr show dev $os_eth | grep inet &>/dev/null; then
         watch_ip $os_eth &
     fi
 }
@@ -172,14 +172,14 @@ start() {
     test -r /data/etc/ppp/modem && ifconfig | grep $os_ppp &>/dev/null && ppp_ok="ok"
     
     # if wifi or ppp link ok, start eth in background
-    if [ "$wlan_ok" == "ok" ] || [ "$ppp_ok" == "ok" ]; then
+    if [[ "$wlan_ok" == "ok" ]] || [[ "$ppp_ok" == "ok" ]]; then
         start_eth &>/dev/null &
     else
         start_eth && eth_ok="ok"
     fi
     
-    if [ "$eth_ok" != "ok" ] && [ "$wlan_ok" != "ok" ] && [ "$ppp_ok" != "ok" ]; then
-        if [ "$link_watch" == "true" ]; then
+    if [[ "$eth_ok" != "ok" ]] && [[ "$wlan_ok" != "ok" ]] && [[ "$ppp_ok" != "ok" ]]; then
+        if [[ "$link_watch" == "true" ]]; then
             logger -t network -s "no network connection available, calling panic action"
             panic_action network
             return 1
@@ -189,13 +189,13 @@ start() {
         fi
     fi
 
-    if [ -n "$static_gw" ]; then
+    if [[ -n "$static_gw" ]]; then
         msg_begin "Setting static gateway to $static_gw"
         ip route add default via $static_gw
         test $? == 0 && msg_done || msg_fail
     fi
 
-    if [ -n "$static_dns" ]; then
+    if [[ -n "$static_dns" ]]; then
         msg_begin "Setting static DNS server to $static_dns"
         echo "nameserver $static_dns" > /etc/resolv.conf
         test $? == 0 && msg_done || msg_fail
diff --git a/board/common/overlay/etc/init.d/S41netwatch b/board/common/overlay/etc/init.d/S41netwatch
index 2abd6433c6..a7bd496f32 100755
--- a/board/common/overlay/etc/init.d/S41netwatch
+++ b/board/common/overlay/etc/init.d/S41netwatch
@@ -7,7 +7,7 @@ netwatch_interval=20
 
 test -f $watch_conf && source $watch_conf || exit 0
 
-if [ -z "$netwatch_host" ] || [ -z "$netwatch_port" ]; then
+if [[ -z "$netwatch_host" ]] || [[ -z "$netwatch_port" ]]; then
     exit 0
 fi
 
@@ -23,7 +23,7 @@ watch() {
         if nc -z -w $netwatch_timeout $netwatch_host $netwatch_port </dev/null >/dev/null 2>&1; then
             count=0
         else
-            if [ $count -lt $netwatch_retries ]; then
+            if [[ $count -lt $netwatch_retries ]]; then
                 logger -t netwatch -s "cannot connect to $netwatch_host:$netwatch_port"
                 count=$(($count + 1))
                 continue
diff --git a/board/common/overlay/etc/init.d/S43firewall b/board/common/overlay/etc/init.d/S43firewall
index a6313d2559..3e049c18d8 100755
--- a/board/common/overlay/etc/init.d/S43firewall
+++ b/board/common/overlay/etc/init.d/S43firewall
@@ -4,10 +4,10 @@ sys_conf="/etc/firewall.sh"
 boot_conf="/boot/firewall.sh"
 conf="/data/etc/firewall.sh"
 
-if ! [ -f $conf ]; then
-    if [ -f $boot_conf ]; then
+if ! [[ -f $conf ]]; then
+    if [[ -f $boot_conf ]]; then
         cp $boot_conf $conf
-    elif [ -f $sys_conf ]; then
+    elif [[ -f $sys_conf ]]; then
         cp $sys_conf $conf
     fi
 fi
diff --git a/board/common/overlay/etc/init.d/S45dnsmasq b/board/common/overlay/etc/init.d/S45dnsmasq
index c571488db4..e6c7c3ffed 100755
--- a/board/common/overlay/etc/init.d/S45dnsmasq
+++ b/board/common/overlay/etc/init.d/S45dnsmasq
@@ -7,10 +7,10 @@ conf="/data/etc/dnsmasq.conf"
 log="/var/log/dnsmasq.log"
 prog="/usr/sbin/dnsmasq"
 
-if ! [ -f $conf ]; then
-    if [ -f $boot_conf ]; then
+if ! [[ -f $conf ]]; then
+    if [[ -f $boot_conf ]]; then
         cp $boot_conf $conf
-    elif [ -f $sys_conf ]; then
+    elif [[ -f $sys_conf ]]; then
         cp $sys_conf $conf
     fi
 fi
diff --git a/board/common/overlay/etc/init.d/S50date b/board/common/overlay/etc/init.d/S50date
index 87464d368c..0390037222 100755
--- a/board/common/overlay/etc/init.d/S50date
+++ b/board/common/overlay/etc/init.d/S50date
@@ -11,18 +11,18 @@ sys_ntp_conf="/etc/ntp.conf"
 boot_ntp_conf="/boot/ntp.conf"
 ntp_conf="/data/etc/ntp.conf"
 
-if ! [ -f $conf ]; then
-    if [ -f $boot_conf ]; then
+if ! [[ -f $conf ]]; then
+    if [[ -f $boot_conf ]]; then
         cp $boot_conf $conf
-    elif [ -f $sys_conf ]; then
+    elif [[ -f $sys_conf ]]; then
         cp $sys_conf $conf
     fi
 fi
 
-if ! [ -f $ntp_conf ]; then
-    if [ -f $boot_ntp_conf ]; then
+if ! [[ -f $ntp_conf ]]; then
+    if [[ -f $boot_ntp_conf ]]; then
         cp $boot_ntp_conf $ntp_conf
-    elif [ -f $sys_ntp_conf ]; then
+    elif [[ -f $sys_ntp_conf ]]; then
         cp $sys_ntp_conf $ntp_conf
     fi
 fi
@@ -69,7 +69,7 @@ start_ntp() {
 
     cat $ntp_conf | grep -v iburst > ${ntp_conf}.tmp
 
-    if [ -n "$date_ntp_server" ]; then
+    if [[ -n "$date_ntp_server" ]]; then
         echo "server $date_ntp_server iburst" > $ntp_conf
     else
         cat $sys_ntp_conf | grep iburst > $ntp_conf
@@ -100,7 +100,7 @@ stop_ntp() {
 }
 
 start() {
-    if [ "$date_method" == "http" ]; then
+    if [[ "$date_method" == "http" ]]; then
         start_http
     else
         start_ntp
@@ -110,7 +110,7 @@ start() {
 }
 
 stop() {
-    if [ "$date_method" == "http" ]; then
+    if [[ "$date_method" == "http" ]]; then
         stop_http
     else
         stop_ntp
diff --git a/board/common/overlay/etc/init.d/S51crond b/board/common/overlay/etc/init.d/S51crond
index 1a839f71df..618b482e12 100755
--- a/board/common/overlay/etc/init.d/S51crond
+++ b/board/common/overlay/etc/init.d/S51crond
@@ -8,7 +8,7 @@ test -n "$os_version" || source /etc/init.d/base
 start() {
     msg_begin "Starting crond"
     
-    if [ -d $sys_conf ];  then
+    if [[ -d $sys_conf ]];  then
         /usr/sbin/crond -c $sys_conf
     fi
 
diff --git a/board/common/overlay/etc/init.d/conf b/board/common/overlay/etc/init.d/conf
index dc71091fb9..46ab1a6378 100644
--- a/board/common/overlay/etc/init.d/conf
+++ b/board/common/overlay/etc/init.d/conf
@@ -4,26 +4,26 @@ _sys_conf="/etc/os.conf"
 _boot_conf="/boot/os.conf"
 _conf="/data/etc/os.conf"
 
-if ! [ -d /data/etc ]; then
+if ! [[ -d /data/etc ]]; then
     # use boot/system variants if we don't have the data partition mounted
-    if [ -f $_boot_conf ]; then
+    if [[ -f $_boot_conf ]]; then
         source $_boot_conf
-    elif [ -f $_sys_conf ]; then
+    elif [[ -f $_sys_conf ]]; then
         source $_sys_conf
     fi
 
     return
 fi
 
-if ! [ -f $_conf ]; then
-    if [ -f $_boot_conf ]; then
+if ! [[ -f $_conf ]]; then
+    if [[ -f $_boot_conf ]]; then
         cp $_boot_conf $_conf
-    elif [ -f $_sys_conf ]; then
+    elif [[ -f $_sys_conf ]]; then
         cp $_sys_conf $_conf
     fi
 fi
 
-if [ -f $_conf ]; then
+if [[ -f $_conf ]]; then
     source $_conf
 fi
 
diff --git a/board/common/overlay/etc/init.d/panic b/board/common/overlay/etc/init.d/panic
index e0d288d0d6..fcf6724e54 100755
--- a/board/common/overlay/etc/init.d/panic
+++ b/board/common/overlay/etc/init.d/panic
@@ -13,11 +13,11 @@ panic_action() {
     echo $((panic_counter + 1)) > ${_PANIC_COUNTER_FILE}
     
     delay=$((_PANIC_REBOOT_DELAY_FACTOR * panic_counter))
-    if [ "${delay}" -gt "${_PANIC_REBOOT_DELAY_MAX}" ]; then
+    if [[ "${delay}" -gt "${_PANIC_REBOOT_DELAY_MAX}" ]]; then
         delay=${_PANIC_REBOOT_DELAY_MAX}
     fi
     
-    if [ "${delay}" -gt 0 ]; then
+    if [[ "${delay}" -gt 0 ]]; then
         logger -t panic -s "rebooting in ${delay} seconds (caused by $1)"
         sleep ${delay}
     fi
diff --git a/board/common/overlay/etc/init.d/rcK b/board/common/overlay/etc/init.d/rcK
index 90d77ec140..7d08910c5b 100755
--- a/board/common/overlay/etc/init.d/rcK
+++ b/board/common/overlay/etc/init.d/rcK
@@ -10,8 +10,8 @@ echo "---- shutting down $os_name $os_version ----" >> $boot_log
 # stop all init scripts in /etc/init.d,
 # executing them in reverse numerical order.
 (for i in $(ls -r /etc/init.d/S??*); do
-    [ ! -x "$i" ] && continue
-    [ -f /data/etc/no_$(basename $i) ] && continue
+    if ! [[ -x "$i" ]]; then continue; fi
+    if [[ -f /data/etc/no_$(basename $i) ]]; then continue; fi
     $i stop
 done& echo $! > $pid_file) | tee -a $boot_log &
 
diff --git a/board/common/overlay/etc/init.d/rcS b/board/common/overlay/etc/init.d/rcS
index 22fa4ac98f..d15157610f 100755
--- a/board/common/overlay/etc/init.d/rcS
+++ b/board/common/overlay/etc/init.d/rcS
@@ -11,8 +11,8 @@ echo "---- booting $os_name $os_version ----" >> $tmp_boot_log
 # start all init scripts in /etc/init.d,
 # executing them in numerical order.
 (for i in /etc/init.d/S??* /etc/init.d/bootdone; do
-    [ ! -x "$i" ] && continue
-    [ -f /data/etc/no_$(basename $i) ] && continue
+    if ! [[ -x "$i" ]]; then continue; fi
+    if [[ -f /data/etc/no_$(basename $i) ]]; then continue; fi
     $i start || break
 done& echo $! > $pid_file) | tee -a $tmp_boot_log &
 
diff --git a/board/raspberrypi/overlay/etc/init.d/S05cpufreq b/board/raspberrypi/overlay/etc/init.d/S05cpufreq
index 5c97047d42..82ae420f49 100755
--- a/board/raspberrypi/overlay/etc/init.d/S05cpufreq
+++ b/board/raspberrypi/overlay/etc/init.d/S05cpufreq
@@ -8,7 +8,7 @@ govdir="/sys/devices/system/cpu/cpufreq/$gov"
 
 configure() {
     echo $gov > $cpufreqdir/scaling_governor
-    if [ $gov == "ondemand" ]; then
+    if [[ $gov == "ondemand" ]]; then
         echo 50 > $govdir/up_threshold
         echo 100000 > $govdir/sampling_rate
         echo 50 > $govdir/sampling_down_factor
diff --git a/board/raspberrypi/overlay/etc/init.d/S11throttlewatch b/board/raspberrypi/overlay/etc/init.d/S11throttlewatch
index 05e1ada454..a06374158c 100755
--- a/board/raspberrypi/overlay/etc/init.d/S11throttlewatch
+++ b/board/raspberrypi/overlay/etc/init.d/S11throttlewatch
@@ -21,7 +21,7 @@ get_throttled_since_boot() {
 watch_now() {
     while true; do
         t=$(get_throttled_now)
-        if [ -n "$t" ]; then
+        if [[ -n "$t" ]]; then
             logger -t throttlewatch -s "currently: $t"
         fi
 
@@ -32,7 +32,7 @@ watch_now() {
 watch_since_boot() {
     while true; do
         t=$(get_throttled_since_boot)
-        if [ -n "$t" ]; then
+        if [[ -n "$t" ]]; then
             logger -t throttlewatch -s "since boot: $t"
             break
         fi
diff --git a/board/raspberrypi/overlay/etc/init.d/S13btuart b/board/raspberrypi/overlay/etc/init.d/S13btuart
index 48464b8263..f5d51a4148 100755
--- a/board/raspberrypi/overlay/etc/init.d/S13btuart
+++ b/board/raspberrypi/overlay/etc/init.d/S13btuart
@@ -11,8 +11,8 @@ test -d "/proc/device-tree/soc/gpio@7e200000/uart0_pins" || exit 0  # no rpi blu
 test -n "$os_version" || source /etc/init.d/base
 
 function start() {
-    if [ "$(cat /proc/device-tree/aliases/uart0)" = "$(cat /proc/device-tree/aliases/serial1)" ] ; then
-        if [ "$(wc -c /proc/device-tree/soc/gpio@7e200000/uart0_pins/brcm\,pins | cut -f 1 -d ' ')" = " 16" ] ; then
+    if [[ "$(cat /proc/device-tree/aliases/uart0)" = "$(cat /proc/device-tree/aliases/serial1)" ]] ; then
+        if [[ "$(wc -c /proc/device-tree/soc/gpio@7e200000/uart0_pins/brcm\,pins | cut -f 1 -d ' ')" = " 16" ]] ; then
 	        /usr/bin/hciattach -t5 /dev/serial1 bcm43xx 3000000 flow - &>/dev/null
         else
 	        /usr/bin/hciattach -t5 /dev/serial1 bcm43xx 921600 noflow - &>/dev/null
diff --git a/board/raspberrypi2/overlay/etc/init.d/S05cpufreq b/board/raspberrypi2/overlay/etc/init.d/S05cpufreq
index 5c97047d42..82ae420f49 100755
--- a/board/raspberrypi2/overlay/etc/init.d/S05cpufreq
+++ b/board/raspberrypi2/overlay/etc/init.d/S05cpufreq
@@ -8,7 +8,7 @@ govdir="/sys/devices/system/cpu/cpufreq/$gov"
 
 configure() {
     echo $gov > $cpufreqdir/scaling_governor
-    if [ $gov == "ondemand" ]; then
+    if [[ $gov == "ondemand" ]]; then
         echo 50 > $govdir/up_threshold
         echo 100000 > $govdir/sampling_rate
         echo 50 > $govdir/sampling_down_factor
diff --git a/board/raspberrypi2/overlay/etc/init.d/S11throttlewatch b/board/raspberrypi2/overlay/etc/init.d/S11throttlewatch
index 05e1ada454..a06374158c 100755
--- a/board/raspberrypi2/overlay/etc/init.d/S11throttlewatch
+++ b/board/raspberrypi2/overlay/etc/init.d/S11throttlewatch
@@ -21,7 +21,7 @@ get_throttled_since_boot() {
 watch_now() {
     while true; do
         t=$(get_throttled_now)
-        if [ -n "$t" ]; then
+        if [[ -n "$t" ]]; then
             logger -t throttlewatch -s "currently: $t"
         fi
 
@@ -32,7 +32,7 @@ watch_now() {
 watch_since_boot() {
     while true; do
         t=$(get_throttled_since_boot)
-        if [ -n "$t" ]; then
+        if [[ -n "$t" ]]; then
             logger -t throttlewatch -s "since boot: $t"
             break
         fi
diff --git a/board/raspberrypi3/overlay/etc/init.d/S05cpufreq b/board/raspberrypi3/overlay/etc/init.d/S05cpufreq
index 5c97047d42..82ae420f49 100755
--- a/board/raspberrypi3/overlay/etc/init.d/S05cpufreq
+++ b/board/raspberrypi3/overlay/etc/init.d/S05cpufreq
@@ -8,7 +8,7 @@ govdir="/sys/devices/system/cpu/cpufreq/$gov"
 
 configure() {
     echo $gov > $cpufreqdir/scaling_governor
-    if [ $gov == "ondemand" ]; then
+    if [[ $gov == "ondemand" ]]; then
         echo 50 > $govdir/up_threshold
         echo 100000 > $govdir/sampling_rate
         echo 50 > $govdir/sampling_down_factor
diff --git a/board/raspberrypi3/overlay/etc/init.d/S11throttlewatch b/board/raspberrypi3/overlay/etc/init.d/S11throttlewatch
index 05e1ada454..a06374158c 100755
--- a/board/raspberrypi3/overlay/etc/init.d/S11throttlewatch
+++ b/board/raspberrypi3/overlay/etc/init.d/S11throttlewatch
@@ -21,7 +21,7 @@ get_throttled_since_boot() {
 watch_now() {
     while true; do
         t=$(get_throttled_now)
-        if [ -n "$t" ]; then
+        if [[ -n "$t" ]]; then
             logger -t throttlewatch -s "currently: $t"
         fi
 
@@ -32,7 +32,7 @@ watch_now() {
 watch_since_boot() {
     while true; do
         t=$(get_throttled_since_boot)
-        if [ -n "$t" ]; then
+        if [[ -n "$t" ]]; then
             logger -t throttlewatch -s "since boot: $t"
             break
         fi
diff --git a/board/raspberrypi3/overlay/etc/init.d/S13btuart b/board/raspberrypi3/overlay/etc/init.d/S13btuart
index 6899065c82..513842ba6a 100755
--- a/board/raspberrypi3/overlay/etc/init.d/S13btuart
+++ b/board/raspberrypi3/overlay/etc/init.d/S13btuart
@@ -9,8 +9,8 @@ test -f $conf || test -f $boot_conf || test -f $sys_conf || exit 0
 test -n "$os_version" || source /etc/init.d/base
 
 function start() {
-    if [ "$(cat /proc/device-tree/aliases/uart0)" = "$(cat /proc/device-tree/aliases/serial1)" ] ; then
-        if [ "$(wc -c /proc/device-tree/soc/gpio@7e200000/uart0_pins/brcm\,pins | cut -f 1 -d ' ')" = " 16" ] ; then
+    if [[ "$(cat /proc/device-tree/aliases/uart0)" = "$(cat /proc/device-tree/aliases/serial1)" ]] ; then
+        if [[ "$(wc -c /proc/device-tree/soc/gpio@7e200000/uart0_pins/brcm\,pins | cut -f 1 -d ' ')" = " 16" ]] ; then
 	        /usr/bin/hciattach -t5 /dev/serial1 bcm43xx 3000000 flow - &>/dev/null
         else
 	        /usr/bin/hciattach -t5 /dev/serial1 bcm43xx 921600 noflow - &>/dev/null