This is an old post i had on my wiki before i deleted it. This will be updated in a near future since unionfs has been updated and so has my system. I haven´t found out yet how to do an easy upgrade of unionfs, but if you do know, please leave a comment.
Here comes the origial post:
First get the sources from http://www.fsl.cs.sunysb.edu/project-unionfs.html. The current version as of this writing is 1.1.5 for kernels 2.6.9-2.6.15. Doing a “uname -r” will tell you what your current kernel is. Mine was “2.6.15-27-k7″.
Then you have to get the kernel sources, headers and libuu-dev:
sudo apt-get install linux-source linux-headers-2.6.15-27-k7 libuu-dev
Get to the directory where you downloaded the sources to and do: tar zxvf unionfs-x.x.x cd unionfs-x.x.x
Then you have to edit the Makefile: nano Makefile and change the line “BINS := unionctl uniondbg unoinimap” to “BINS := unionctl uniondbg” and then change the line ” cp unionimap ${PREFIX}/sbin” to “# cp unionimap ${PREFIX}/sbin”
This is because i didnt find the correct e2fsprogs-headers or something in ubuntu packages.
then do sudo make, and then sudo make install
After that, sudo depmod -a and then sudo modprobe unionfs
then all you have to do is something like: sudo mount -t unionfs -o dirs=/mnt/F=rw:/mnt/G=ro:/mnt/H=ro:/mnt/E=ro unionfs /mnt/All (note that F=rw while all others is ro, bug in unionfs somewhere)
Using some help from http://www.linux-live.org/unionfs/
I will try to find a way to upgrade to a newer version that maybe supports true transparency so i can delete files from my union mounted resource, but i don’t know at the moment how to do that, so if you do, please let me know!
