Use an external kernel for testing.

.gitignore

@@ -3,6 +3,7 @@
 /*.egg-info/
 /build/
 /dist/
+/tests/linux.uml
 /tests/before*
 /tests/after*
 /tests/keyfile

.travis.yml

@@ -8,25 +8,26 @@ install:
 - sudo apt-get build-dep btrfs-tools
 - which python3
 - wget
-    https://raw.github.com/pypa/pip/master/contrib/get-pip.py
     http://python-distribute.org/distribute_setup.py
-    https://mirrors.kernel.org/ubuntu//pool/main/a/augeas/libaugeas0_1.0.0-0ubuntu1_amd64.deb
+    https://raw.github.com/pypa/pip/master/contrib/get-pip.py
+    https://mirrors.kernel.org/ubuntu/pool/main/a/augeas/libaugeas0_1.0.0-0ubuntu1_amd64.deb
+- curl --compressed https://raw.github.com/g2p/kernels/master/linux.uml -o tests/linux.uml
+- chmod +x tests/linux.uml
 - sudo dpkg -i libaugeas0*deb
+- export PATH=$PATH:$HOME/.local/bin:$PWD/enter-uml:$PWD/btrfs-progs
+- export PIP_USE_MIRRORS=true PIP_DOWNLOAD_CACHE=~/.cache
 - python3.3 distribute_setup.py --user
-- export PATH=$PATH:$HOME/.local/bin
 - easy_install-3.3 --user pip
-- export PIP_USE_MIRRORS=true PIP_DOWNLOAD_CACHE=~/.cache
 - pip-3.3 install --user
     -e. -e git+https://github.com/g2p/[email protected]#egg=python-augeas
     https://github.com/g2p/pyparted/archive/pyparted-3.10a1.tar.gz#egg=pyparted
     coverage
 - git clone https://github.com/g2p/enter-uml.git
 - git clone https://github.com/g2p/bcache-tools.git
-- make -C bcache-tools
-- sudo make -C bcache-tools install
 - git clone https://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-progs.git
 - make -C btrfs-progs version.h btrfs-show-super
-- export PATH=$PATH:$PWD/enter-uml:$PWD/btrfs-progs
+- make -C bcache-tools
+- sudo make -C bcache-tools install
 - sudo mkdir -vp /etc/lvm/backup /etc/lvm/archive
 - sudo ln -Tsf /proc/mounts /etc/mtab