Mount an VHD on Mac OS X

Posted by janm on Server Fault See other posts from Server Fault or by janm
Published on 2010-08-25T10:14:04Z Indexed on 2012/10/15 21:40 UTC
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Is it possible (how) to mount an VHD file created by Windows 7 in OS X?

I found some information about how to do this on linux. There is a fuse fs "vdfuse" which uses virtualbox libs to mount filesystems supported by virtualbox. However I was unable to compile the package on osx because nearly all headers are missing and I doubt that it would work anyway...

EDIT #2: Okay I got my hands dirty and finally compiled vdfuse (http://forums.virtualbox.org/viewtopic.php?f=26&t=33355&start=0) on osx. As a starting point I used macfuse (http://code.google.com/p/macfuse/) and looked at the example file systems.

This led me to the following build script

infile=vdfuse.c
outfile=vdfuse
incdir="your/path/to/vbox/headers"
INSTALL_DIR="/Applications/VirtualBox.app/Contents/MacOS"
CFLAGS="-pipe"

gcc -arch i386 "${infile}" \
         "${INSTALL_DIR}"/VBoxDD.dylib \
         "${INSTALL_DIR}"/VBoxDDU.dylib \
         "${INSTALL_DIR}"/VBoxVMM.dylib \
         "${INSTALL_DIR}"/VBoxRT.dylib \
         "${INSTALL_DIR}"/VBoxDD2.dylib \
         "${INSTALL_DIR}"/VBoxREM.dylib \
        -o "${outfile}" \
        -I"${incdir}" -I"/usr/local/include/fuse" \
        -Wl,-rpath,"${INSTALL_DIR}"  \
        -lfuse_ino64  \
        -Wall ${CFLAGS}

You actually don't need to compile VirtualBox on your machine, just install a recent version of VirtualBox.

So now I can partially mount vhds. The separate partitions appear as block files Partition1, Partition2, ... on my mount point. However Mac OS X does not include a loopback file system and macfuse's loopback fs does not work with block files, so we need a loopback fs to mount the blockfiles as actual partitions.

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