- fix mount of /sys for getting IO statistics

- adapt it for more udev versions
- make statistics code a bit more robust

build

@@ -720,7 +720,7 @@ background_monitor_process()
 
       if [ ${memtotal} -gt $max_mem ]; then
         max_mem="${memtotal}"
-        echo -n $(( $max_mem / 1024 )) > /.build/_statistics.memory
+        echo -n $(( $max_mem / 1024 )) > /.build/_statistics.memory.new && mv /.build/_statistics.memory.new /.build/_statistics.memory
       fi
     fi
 
@@ -730,7 +730,7 @@ background_monitor_process()
 
       if [ ${c[2]} -gt $max_disk ]; then
         max_disk="${c[2]}"
-        echo -n $max_disk > /.build/_statistics.df
+        echo -n $max_disk > /.build/_statistics.df.new && mv /.build/_statistics.df.new /.build/_statistics.df
       fi
     fi
 
@@ -2514,6 +2514,7 @@ for SPECFILE in "${SPECFILES[@]}" ; do
 		done
                 if test "$statistics" = 1; then
                     mkdir -p OTHER
+                    [ -e _statistics ] && mv _statistics OTHER/
                     [ -n "$TIME_PREINSTALL" ] && echo "TIME_preinstall: $TIME_PREINSTALL"  >> OTHER/_statistics
                     TIME_TOTAL=$(( `date +%s` - $TIME_START_TIME ))
                     echo "TIME_total: $TIME_TOTAL"  >> OTHER/_statistics
@@ -3139,15 +3140,22 @@ if test -n "$RUNNING_IN_VM"; then
            echo "" >> $TOPDIR/OTHER/_statistics
            rm /.build/_statistics.memory
          fi
+         mkdir -p /sys
          mount -n sys /sys -t sysfs
-         device="sda"
+         device="hda1"
+         [ -e /dev/sda ] && device="sda"
          [ -e /dev/vda ] && device="vda"
          [ -e /dev/dasda ] && device="dasda" # in z/VM
-         disk=(`cat /sys/block/${device}/stat`)
-         [ "0${disk[0]}" -gt 0 ] && echo "IO_requests_read: ${disk[0]}"  >> $TOPDIR/OTHER/_statistics
-         [ "0${disk[2]}" -gt 0 ] && echo "IO_sectors_read: ${disk[2]}"   >> $TOPDIR/OTHER/_statistics
-         [ "0${disk[4]}" -gt 0 ] && echo "IO_requests_write: ${disk[4]}" >> $TOPDIR/OTHER/_statistics
-         [ "0${disk[6]}" -gt 0 ] && echo "IO_sectors_write: ${disk[6]}"  >> $TOPDIR/OTHER/_statistics
+         if [ -e /sys/block/${device}/stat ]; then
+           disk=(`cat /sys/block/${device}/stat`)
+           [ "0${disk[0]}" -gt 0 ] && echo "IO_requests_read: ${disk[0]}"  >> $TOPDIR/OTHER/_statistics
+           [ "0${disk[2]}" -gt 0 ] && echo "IO_sectors_read: ${disk[2]}"   >> $TOPDIR/OTHER/_statistics
+           [ "0${disk[4]}" -gt 0 ] && echo "IO_requests_write: ${disk[4]}" >> $TOPDIR/OTHER/_statistics
+           [ "0${disk[6]}" -gt 0 ] && echo "IO_sectors_write: ${disk[6]}"  >> $TOPDIR/OTHER/_statistics
+         else
+           echo "ERROR: no root disk device found, yet another new device name?"
+           ls -l /sys/block/
+         fi
          umount /sys
     fi