disable suspend if booting from removable storage

packages/sysutils/busybox/scripts/init

@@ -588,6 +588,25 @@
 
   BOOT_STEP=final
 
+  # no suspend when booted from nonpersistent storage
+  STORAGE=$(cat /proc/mounts | grep " /sysroot/storage " | awk '{print $1}' | awk -F '/' '{print $3}')
+  if [ -n "$STORAGE" ] ; then
+    removable="/sys/class/block/*/$STORAGE/../removable"
+    if [ -e $removable ] ; then
+      if [ "$(cat $removable 2>/dev/null)" = "1" ] ; then
+        SUSPEND_DISABLED=yes
+      fi
+    fi
+  fi
+  FLASH=$(cat /proc/mounts | grep " /sysroot/flash " | awk '{print $1}' | awk -F '/' '{print $3}')
+  if [ -n "$FLASH" ] ; then
+    removable="/sys/class/block/*/$FLASH/../removable"
+    if [ -e $removable ] ; then
+      if [ "$(cat $removable 2>/dev/null)" = "1" ] ; then
+        SUSPEND_DISABLED=yes
+      fi
+    fi
+  fi
   # move some special filesystems
   /bin/busybox mount --move /dev /sysroot/dev
   /bin/busybox mount --move /proc /sysroot/proc
@@ -601,6 +620,10 @@
   if [ "$STORAGE_NETBOOT" = "yes" ] ; then
     echo "" > /sysroot/dev/.storage_netboot
   fi
+  # no suspend when booted from nonpersistent storage
+  if [ "$SUSPEND_DISABLED" = "yes" ] ; then
+    echo "" > /sysroot/dev/.suspend_disabled
+  fi
   # switch to new sysroot and start real init
   exec /bin/busybox switch_root /sysroot /usr/lib/systemd/systemd $INIT_ARGS
 

packages/sysutils/systemd/patches/systemd-11_disable-suspend-if-dev-.suspend_disabled-exist.patch

@@ -0,0 +1,27 @@
+From a8ad8aadc39820594f89d43aa0f8d527b256aa99 Mon Sep 17 00:00:00 2001
+From: Stefan Saraev <stefan@saraev.ca>
+Date: Sat, 22 Mar 2014 13:40:55 +0200
+Subject: [PATCH] disable suspend if /dev/.suspend_disabled exist
+
+---
+ src/shared/sleep-config.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/src/shared/sleep-config.c b/src/shared/sleep-config.c
+index cf1cd40..f6ad307 100644
+--- a/src/shared/sleep-config.c
++++ b/src/shared/sleep-config.c
+@@ -256,6 +256,10 @@ int can_sleep(const char *verb) {
+                streq(verb, "hibernate") ||
+                streq(verb, "hybrid-sleep"));
+
++        // boo
++        if (access("/dev/.suspend_disabled", F_OK) == 0)
++                return false;
++
+         r = parse_sleep_config(verb, &modes, &states);
+         if (r < 0)
+                 return false;
+-- 
+1.9.1
+