Testing btrfs snapshots and git on ramdisk (tmpfs)

gistfile1.txt

These are my notes while testing.

Ubuntu LTS 10.04 doesn't support removing btrfs snapshots. It can be fixed by installing newer btrfs.

    cd /tmp
    wget "http://se.archive.ubuntu.com/ubuntu/pool/main/b/btrfs-tools/btrfs-tools_0.19+20100601-3ubuntu3_i386.deb"
    dpkg -i btrfs-tools_0.19+20100601-3ubuntu3_i386.deb

Creating the master git repository (on a flash drive):

    mkdir -p /flash/disk0
    cd /flash/disk0
    git init
    echo 'This is a test file.' > test.txt
    git add test.txt
    git commit -a -m 'Added initial test data.'

Initialising tmpfs:

    mkdir /ramdisks
    mount -t tmpfs tmpfs /ramdisks
    mkdir /ramdisks/raw /ramdisks/mnt

Creating images on ramdisk:

    dd if=/dev/zero of=/ramdisks/raw/disk0 bs=1M count=256

Initializing btrfs image:
    mkfs.btrfs /ramdisks/raw/disk0

Mounting btrfs image:

    mount -o loop /ramdisks/raw/disk0 /ramdisks/mnt/disk0

Cloning flash to the ramdisk:

    git clone /flash/disk0 /ramdisks/mnt/disk0/data

Creating snapshot:

    btrfsctl -s /ramdisks/mnt/disk0/snapshot/disk0-20120124-2149 /ramdisks/mnt/disk0/data