SOURCES: mount.vdi (NEW) - mount(1) helper to mount partitions fro...

[glen]

Author: glen                         Date: Fri Mar 28 19:30:51 2008 GMT
Module: SOURCES                       Tag: HEAD
---- Log message:
- 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.

---- Files affected:
SOURCES:
   mount.vdi (NONE -> 1.1)  (NEW)

---- Diffs:

================================================================
Index: SOURCES/mount.vdi
diff -u /dev/null SOURCES/mount.vdi:1.1
--- /dev/null	Fri Mar 28 20:30:51 2008
+++ SOURCES/mount.vdi	Fri Mar 28 20:30:46 2008
@@ -0,0 +1,173 @@
+#!/bin/sh
+#==============================================================================
+# mount.vdi
+#   Copyright (C) Elan Ruusamäe <glen at 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
================================================================