Add automatic updating for vault version

Signed-off-by: Knut Ahlers <knut@ahlers.me>

.travis.yml

@@ -0,0 +1,7 @@
+sudo: required
+
+services:
+  - docker
+
+script:
+  - bash update-version.sh

Dockerfile

@@ -2,8 +2,8 @@ FROM alpine
 
 LABEL maintainer "Knut Ahlers <knut@luzifer.io>"
 
-ENV VAULT_VERSION=0.8.1 \
-    VAULT_HASH=3c4d70ba71619a43229e65c67830e30e050eab7a81ac6b28325ff707e5914188
+ENV VAULT_VERSION 0.8.1
+ENV VAULT_HASH 3c4d70ba71619a43229e65c67830e30e050eab7a81ac6b28325ff707e5914188
 
 ADD https://releases.hashicorp.com/vault/${VAULT_VERSION}/vault_${VAULT_VERSION}_linux_amd64.zip /tmp/vault.zip
 

update-version.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+
+set -e
+set -o pipefail
+
+### ---- ###
+
+echo "Switch back to master"
+git checkout master
+git reset --hard origin/master
+
+### ---- ###
+
+echo "Fetching latest version..."
+LATEST=$(curl -sSLf 'https://latest.luzifer.io/catalog-api/vault/latest.txt?p=version')
+
+echo "Getting SHA256SUM for Linux AMD64 version..."
+SHASUM=$(curl -s https://releases.hashicorp.com/vault/${LATEST}/vault_${LATEST}_SHA256SUMS | awk '/linux_amd64/{print $1}')
+
+echo "Testing availability of archive 'vault_${LATEST}_linux_amd64.zip'..."
+curl -sSLIfo /dev/null https://releases.hashicorp.com/vault/${LATEST}/vault_${LATEST}_linux_amd64.zip
+
+echo "Found version ${LATEST}, patching..."
+sed -i "s/ENV VAULT_VERSION .*$/ENV VAULT_VERSION ${LATEST}/" Dockerfile
+sed -i "s/ENV VAULT_HASH .*$/ENV VAULT_HASH ${SHASUM}/" Dockerfile
+
+echo "Checking for changes..."
+git diff --exit-code && exit 0
+
+echo "Testing build..."
+docker build .
+
+echo "Updating repository..."
+git add Dockerfile
+git -c user.name='Travis Automated Update' -c user.email='travis@luzifer.io' \
+  commit -m "Vault ${LATEST}"
+git tag ${LATEST}
+
+git push -q https://${GH_USER}:${GH_TOKEN}@github.com/luzifer-docker/vault.git master --tags