Two return code consistency fix.

[live-boot-grml.git] / scripts / live

diff --git a/scripts/live b/scripts/live
index eb04d27..56c0a14 100755 (executable)
--- a/scripts/live
+++ b/scripts/live
@@ -944,7 +944,7 @@ try_snap ()
        snap_mount="${2}"
        snap_type="${3}"
 
-       if [ ! -z "${snapdata}" ]
+       if [ -n "${snapdata}" ] && [ ! -b "${snapdata}" ]
        then
                log_success_msg "found snapshot: ${snapdata}"
                snapdev="$(echo ${snapdata} | cut -f1 -d ' ')"
@@ -1391,15 +1391,6 @@ find_livefs ()
 {
        timeout="${1}"
 
-       # first look at the one specified in the command line
-       if [ ! -z "${LIVE_MEDIA}" ]
-       then
-               if check_dev "null" "${LIVE_MEDIA}" "skip_uuid_check"
-               then
-                       return 0
-               fi
-       fi
-
        # don't start autodetection before timeout has expired
        if [ -n "${LIVE_MEDIA_TIMEOUT}" ]
        then
@@ -1409,6 +1400,54 @@ find_livefs ()
                fi
        fi
 
+       # first look at the one specified in the command line
+       case "${LIVE_MEDIA}" in
+               removable-usb)
+                       for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -vE "/(loop|ram|dm-|fd)")
+                       do
+                               if [ "$(cat ${sysblock}/removable)" = "1" ]
+                               then
+                                       if readlink ${sysblock}/device | grep -q usb
+                                       then
+                                               for dev in $(subdevices "${sysblock}")
+                                               do
+                                                       if check_dev "${dev}"
+                                                       then
+                                                               return 0
+                                                       fi
+                                               done
+                                       fi
+                               fi
+                       done
+                       ;;
+
+               removable)
+                       for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -vE "/(loop|ram|dm-|fd)")
+                       do
+                               if [ "$(cat ${sysblock}/removable)" = "1" ]
+                               then
+                                       for dev in $(subdevices "${sysblock}")
+                                       do
+                                               if check_dev "${dev}"
+                                               then
+                                                       return 0
+                                               fi
+                                       done
+                               fi
+                       done
+                       ;;
+
+               *)
+                       if [ ! -z "${LIVE_MEDIA}" ]
+                       then
+                               if check_dev "null" "${LIVE_MEDIA}" "skip_uuid_check"
+                               then
+                                       return 0
+                               fi
+                       fi
+                       ;;
+       esac
+
        # or do the scan of block devices
        for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -vE "/(loop|ram|dm-|fd)")
        do