- mount(1) helper to mount partitions from VirtualBox .vdi images.

  useful information from this thread: http://forums.virtualbox.org/viewtopic.php?t=52
  and lots of hacking.

Changed files:
    mount.vdi -> 1.1

diff --git a/mount.vdi b/mount.vdi
new file mode 100644 (file)
index 0000000..5aafb7f
--- /dev/null
+++ b/mount.vdi
@@ -0,0 +1,173 @@
+#!/bin/sh
+#==============================================================================
+# mount.vdi
+#   Copyright (C) Elan Ruusamäe <glen@pld-linux.org>, 2008
+#
+#   This program is free software; you can redistribute it and/or
+#   modify it under the terms of the GNU General Public License as
+#   published by the Free Software Foundation; either version 2 of
+#   the License, or (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+#   General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public
+#   License along with this program; if not, write to:
+#   Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+#   Boston, MA  02110-1301  USA
+#
+#   -- For details, see the file named "LICENSE.GPLv2"
+#==============================================================================
+
+# Sanitize environment
+export PATH=/bin:/sbin:/usr/bin:/usr/sbin
+
+# Commands
+LOSETUP=/sbin/losetup
+MOUNT=/bin/mount
+
+PROGRAM=${0##*/}
+OPTIONS=
+FSTYPE=
+
+USAGE="VDI image mountpoint [-o options,...]
+
+Options:
+      partition=<number>              Specify partition to mount
+      fstype=<fstype>                 Specify FS type instead of autodetecting
+"
+
+# This is braindead, two first args are dev and mountpoint if invoked from
+# mount(1), but could be option if invoked from mount.vdi(1)
+if [ -n "$1" ] && [[ "$1" != -* ]]; then
+       DEVICE=$1
+       shift
+fi
+if [ -n "$1" ] && [[ "$1" != -* ]]; then
+       MOUNTPOINT=$1
+       shift
+fi
+
+while :; do
+       case "$1" in
+       -h | "-?" )
+               echo >&2 "Usage: $PROGRAM $USAGE"
+               exit 0 ;;
+       -o )
+               OPTIONS="$2";
+               shift ;;
+       -?* )
+               echo >&2 "$PROGRAM: unrecognized option: $1"
+               exit 1 ;;
+       *)
+               break ;;
+       esac
+       shift
+done
+
+if [ -z "$DEVICE" ]; then
+       echo >&2 "$PROGRAM: device to mount not specified"
+       exit 1
+fi
+
+if [ -z "$MOUNTPOINT" ]; then
+       echo >&2 "$PROGRAM: mount point not specified"
+       exit 1
+fi
+
+if [ ! -f "$DEVICE" ]; then
+       echo >&2 "$PROGRAM: $DEVICE is not a file"
+       exit 1
+fi
+
+if [ ! -d "$MOUNTPOINT" ]; then
+       echo >&2 "$PROGRAM: $MOUNTPOINT is not a directory"
+       exit 1
+fi
+
+# check magic
+magic=$(head -n 1 "$DEVICE")
+if [ "$magic" != "<<< innotek VirtualBox Disk Image >>>" ]; then
+       echo >&2 "$PROGRAM: $DEVICE: bad magic, not VDI image"
+       exit 1
+fi
+
+MOUNTOPTIONS=
+PARTITION=
+OFFSET=
+OLDIFS=$IFS
+IFS=", "
+for opt in $OPTIONS; do
+    KEY=${opt%=*};
+    VAL=${opt#*=};
+       case "$KEY" in
+       part|partition)
+               PARTITION="$VAL"
+               ;;
+       fstype)
+               FSTYPE="$VAL"
+               ;;
+       *)
+               if [ -z "$MOUNTOPTIONS" ]; then
+                       MOUNTOPTIONS="$opt"
+               else
+                       MOUNTOPTIONS="$MOUNTOPTIONS,$opt"
+               fi
+       ;;
+       esac
+done
+IFS="$OLDIFS"
+
+if [ -z "$PARTITION" ]; then
+       echo >&2 "$PROGRAM: missing partition option"
+       exit 1
+fi
+
+# offset when disk starts
+dskoff=8704
+
+# find free loop device. XXX race possible
+imgdev=$(losetup -f)
+losetup $imgdev -o $dskoff "$DEVICE"
+# http://vserver.13thfloor.at/Stuff/QEMU/hdloop.sh
+sfd=$(/sbin/sfdisk -dump $imgdev 2>/dev/null | sed -n ' 
+       /:/ s/[a-zA-Z]*=\ *\([0-9a-f]*\)\(,\|$\)/\1/g;
+       T;  s/^.*:\ //; p' | tr ' ' '.')
+losetup -d $imgdev
+
+getoffset() {
+       pstart=$1
+       psize=$2
+
+       blksize=512
+       offset=$((pstart*blksize))
+       size=$((psize*blksize))
+       echo $((offset+dskoff))
+}
+
+p=1
+for a in $sfd; do
+       if [ "$p" = "$PARTITION" ]; then
+               OFFSET=$(getoffset $(echo "$a" | tr '.' ' '))
+       fi
+       x=$((p++))
+done
+
+if [ -z "$OFFSET" ]; then
+       echo >&2 "$PROGRAM: couldn't figure out offset, perhaps out of range?"
+       exit 1
+fi
+
+if [ -z "$MOUNTOPTIONS" ]; then
+       MOUNTOPTIONS="offset=$OFFSET"
+else
+       MOUNTOPTIONS="$MOUNTOPTIONS,offset=$OFFSET"
+fi
+
+# $MOUNTPOINT might not exist as mount can try to read it from /etc/fstab
+"$MOUNT" ${FSTYPE:+-t "$FSTYPE"} ${MOUNTOPTIONS:+-o "$MOUNTOPTIONS"} "$DEVICE" "$MOUNTPOINT"
+if [ $? -ne 0 ]; then
+    echo >&2 "$PROGRAM: error mounting $DEVICE"
+fi