Skipped some runtime duplicated execution.

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

diff --git a/scripts/live-helpers b/scripts/live-helpers
index f99fa56..0b9bd5f 100644 (file)
--- a/scripts/live-helpers
+++ b/scripts/live-helpers
@@ -1,4 +1,3 @@
-#!/bin/sh
 # live-initramfs helper functions, used by live-initramfs on boot and by live-snapshot
 
 if [ ! -x "/bin/fstype" ]
@@ -31,14 +30,37 @@ subdevices ()
 
 is_supported_fs ()
 {
-       # FIXME: do something better like the scan of supported filesystems
        fstype="${1}"
 
-       case ${fstype} in
-               vfat|iso9660|udf|ext2|ext3|ntfs|jffs2)
+       # Validate input first
+       if [ -z "${fstype}" ]
+       then
+               return 1
+       fi
+
+       # Try to look if it is already supported by the kernel
+       if grep -q ${fstype} /proc/filesystems
+       then
                return 0
-               ;;
-       esac
+       else
+               # Then try to add support for it the gentle way using the initramfs capabilities
+               modprobe ${fstype}
+               if grep -q ${fstype} /proc/filesystems
+               then
+                       return 0
+               # Then try the hard way if /root is already reachable
+               else
+                       kmodule="/root/lib/modules/`uname -r`/${fstype}/${fstype}.ko"
+                       if [ -e "${kmodule}" ]
+                       then
+                               insmod "${kmodule}"
+                               if grep -q ${fstype} /proc/filesystems
+                               then
+                                       return 0
+                               fi
+                       fi
+               fi
+       fi
 
        return 1
 }
@@ -55,7 +77,7 @@ get_fstype ()
            return
        fi
 
-       eval $(fstype < ${1})
+       eval $(fstype < ${1} 2>/dev/null)
 
        if [ "${FSTYPE}" != "unknown" ]
        then
@@ -167,7 +189,15 @@ setup_loop ()
        local readonly=${6}
 
        modprobe -q -b "${module}"
-       udevsettle
+
+       if [ -x /sbin/udevadm ]
+       then
+               # lenny
+               udevadm settle
+       else
+               # etch
+               udevsettle
+       fi
 
        for loopdev in ${pattern}
        do
@@ -239,6 +269,7 @@ try_mount ()
        dev="${1}"
        mountp="${2}"
        opts="${3}"
+       fstype="${4}"
 
        old_mountp="$(where_is_mounted ${dev})"
 
@@ -247,7 +278,11 @@ try_mount ()
                mount -o remount,"${opts}" "${dev}" "${old_mountp}" || panic "Remounting ${dev} ${opts} on ${old_mountp} failed"
                mount -o bind "${old_mountp}" "${mountp}" || panic "Cannot bind-mount ${old_mountp} on ${mountp}"
        else
-               mount -t $(get_fstype "${dev}") -o "${opts}" "${dev}" "${mountp}" || panic "Cannot mount ${dev} on ${mountp}"
+               if [ -z "${fstype}" ]
+               then
+                       fstype=$(get_fstype "${dev}")
+               fi
+               mount -t "${fstype}" -o "${opts}" "${dev}" "${mountp}" || panic "Cannot mount ${dev} on ${mountp}, fstype=${fstype}, options=${opts}"
        fi
 }
 
@@ -306,7 +341,7 @@ find_files ()
                        if is_supported_fs ${devfstype}
                        then
                                mkdir -p "${snap_backing}"
-                               try_mount "${devname}" "${snap_backing}" "ro"
+                               try_mount "${devname}" "${snap_backing}" "ro" ${devfstype}
 
                                for filename in ${filenames}
                                        do