goreleaser: update example image tags to match version being released

Signed-off-by: Steve Kriss <steve@heptio.com>

.gitignore

@@ -7,6 +7,7 @@
 _obj
 _test
 _output
+config
 
 # Architecture specific extensions/prefixes
 *.[568vq]

.goreleaser.yml

@@ -13,6 +13,9 @@
 # limitations under the License.
 
 dist: _output
+before:
+  hooks:
+    - ./hack/set-example-tags.sh
 builds:
   - main: ./cmd/ark/main.go
     env:
@@ -41,7 +44,7 @@ archive:
   name_template: "{{ .ProjectName }}-{{ .Tag }}-{{ .Os }}-{{ .Arch }}"
   files:
     - LICENSE
-    - examples/**/*
+    - config/**/*
 checksum:
   name_template: 'CHECKSUM'
 snapshot:

hack/set-example-tags.sh

+#!/bin/bash
+
+# Copyright 2018 the Heptio Ark contributors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -o nounset
+set -o errexit
+set -o pipefail
+
+# this script copies all of the files under examples/ into a new directory,
+# config/ (which is gitignored so it doesn't result in the git
+# state being dirty, which would prevent goreleaser from running), and then
+# updates all of the image tags in those files to use $GIT_SHA (which will
+# be the release/tag name).
+
+rm -rf config/ && cp -r examples/ config/
+
+# the "-i'.bak'" flag to sed is necessary, with no space between the flag
+# and the value, for this to be compatible across BSD/OSX sed and GNU sed.
+# remove the ".bak" files afterwards (they're copies of the originals).
+find config/ -type f -name "*.yaml" | xargs sed -i'.bak' "s|gcr.io/heptio-images/ark:latest|gcr.io/heptio-images/ark:$GIT_SHA|g"
+find config/ -type f -name "*.bak" | xargs rm
+
+find config/ -type f -name "*.yaml" | xargs sed -i'.bak' "s|gcr.io/heptio-images/fsfreeze-pause:latest|gcr.io/heptio-images/fsfreeze-pause:$GIT_SHA|g"
+find config/ -type f -name "*.bak" | xargs rm