Added credential helper (#51)

* Added credential helper script
* make build only for amd64 and z/os

.travis.yml

@@ -79,6 +79,7 @@ jobs:
 
 before_install:
   - make install-build-deps
+  - make install-credential-helper
 
 install:
   - echo nothing

Makefile

@@ -383,6 +383,12 @@ clean:
 install-build-deps:
 	ARCH=$(ARCH) ./install-build-deps.sh
 
+.PHONY: install-credential-helper
+install-credential-helper:	
+ifneq ($(ARCH),ppc64le)
+	ARCH=$(ARCH) ./travis-build-scripts/install-credential-helper.sh
+endif
+
 .PHONY: build-cov
 build-cov:
 	mkdir -p build

travis-build-scripts/install-credential-helper.sh

@@ -0,0 +1,49 @@
+#!/bin/bash
+# -*- mode: sh -*-
+# © Copyright IBM Corporation 2020
+#
+#
+# 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.
+sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 7EA0A9C3F273FCD8
+sudo add-apt-repository "deb [arch=$ARCH] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
+sudo apt update
+sudo apt -y install docker-ce pass
+
+mkdir -p $GOPATH/src/github.com/docker
+cd $GOPATH/src/github.com/docker
+git clone https://github.com/docker/docker-credential-helpers
+cd docker-credential-helpers
+make pass 
+cp bin/docker-credential-pass $GOPATH/bin/docker-credential-pass
+
+mkdir -p /home/travis/.docker
+echo '{ "credsStore": "pass" }' | tee /home/travis/.docker/config.json
+gpg --batch --gen-key <<-EOF
+%echo generating a standard key
+Key-Type: DSA
+Key-Length: 1024
+Subkey-Type: ELG-E
+Subkey-Length: 1024
+Name-Real: Travis CI
+Name-Email: travis@osism.io
+Expire-Date: 0
+%commit
+%echo done
+EOF
+key=$(gpg --no-auto-check-trustdb --list-secret-keys | grep ^sec | cut -d/ -f2 | cut -d" " -f1)
+gpg --export-secret-keys | gpg2 --import -
+pass init $key
+pass insert docker-credential-helpers/docker-pass-initialized-check <<-EOF
+pass is initialized
+pass is initialized
+EOF