cache zfs artifacts

Author: mmlb

.travis.yml

@@ -4,6 +4,7 @@ sudo: required
 cache:
   directories:
     - $HOME/.ccache
+    - $HOME/zfs
 
 branches:
   only:
@@ -23,9 +24,10 @@ before_install:
   - go get github.com/alecthomas/gometalinter
   - gometalinter --install --update
   - sudo apt-get update -y && sudo apt-get install -y libattr1-dev libblkid-dev linux-headers-$(uname -r) tree uuid-dev
-  - cd /tmp
-  - curl -L https://github.com/zfsonlinux/zfs/releases/download/zfs-$rel/spl-$rel.tar.gz | tar xz
-  - curl -L https://github.com/zfsonlinux/zfs/releases/download/zfs-$rel/zfs-$rel.tar.gz | tar xz
+  - mkdir -p $HOME/zfs
+  - cd $HOME/zfs
+  - [[ -d spl-$rel.tar.gz ]] || curl -L https://github.com/zfsonlinux/zfs/releases/download/zfs-$rel/spl-$rel.tar.gz | tar xz
+  - [[ -d zfs-$rel.tar.gz ]] || curl -L https://github.com/zfsonlinux/zfs/releases/download/zfs-$rel/zfs-$rel.tar.gz | tar xz
   - (cd spl-$rel && ./configure --prefix=/usr && make && sudo make install)
   - (cd zfs-$rel && ./configure --prefix=/usr && make && sudo make install)
   - sudo modprobe zfs