From b98f53f310ed823ed87e3c690a08379d6c707cb4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=81ukasz=20Mierzwa?= <l.mierzwa@gmail.com>
Date: Tue, 18 Apr 2017 14:37:05 -0700
Subject: [PATCH] Set custom docker hub build hook to pass version variable to
 docker

unsee version string is passed as a build arg for the docker build command, add a hook that will set it on hub.
---
 hooks/build | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100755 hooks/build

diff --git a/hooks/build b/hooks/build
new file mode 100755
index 000000000..7076d98f7
--- /dev/null
+++ b/hooks/build
@@ -0,0 +1,18 @@
+#!/bin/bash
+
+# hub.docker.com build hook to set additional build time args
+# https://docs.docker.com/docker-cloud/builds/advanced/
+
+if [[ $DOCKER_TAG == v* ]]; then
+  # DOCKER_TAG is the tag docker will use for our image
+  # images on docker hub are only generated from master branch and tags
+  # release tags in git follow vX.Y.Z format, so if DOCKER_TAG starts with 'v'
+  # it's only a release tag, let's use that as the version
+  VERSION=${DOCKER_TAG}
+else
+  # for everything else use branch-commit as the version, e.g.
+  # master-abcdef
+  VERSION=${SOURCE_BRANCH}-${SOURCE_COMMIT:-latest}
+fi
+
+docker build --build-arg VERSION=${VERSION} -t ${IMAGE_NAME} .