Publish docker image(s) from Travis

.travis.yml

@@ -3,7 +3,7 @@ sudo: required
 language: python
 
 python:
-  - "3.6"
+  - "3.8"
 
 services:
   - docker
@@ -41,3 +41,9 @@ install:
 
 script:
   - python -m unittest -v tests
+
+deploy:
+  provider: script
+  script: ./hooks/push
+  on:
+    branch: master

hooks/build

@@ -1,10 +1,26 @@
-#!/bin/bash
-set -ex
+#!/usr/bin/env python3
+from plumbum import FG, local
 
-# See http://label-schema.org/rc1/#build-time-labels
-time docker image build \
-    --build-arg VCS_REF="$GIT_SHA1" \
-    --build-arg BUILD_DATE="$(date --rfc-3339 ns)" \
-    --build-arg VERSION="$DOCKER_TAG" \
-    --tag "$IMAGE_NAME" \
-    .
+COMMIT = local.env.get("GIT_SHA1", local.env.get("TRAVIS_COMMIT", ""))
+IMAGE_NAME = local.env["IMAGE_NAME"]
+ROOT = local.path(__file__).up(2)
+VERSION = IMAGE_NAME.split(":")[1]
+
+# Shortcuts
+build = local["time"]["docker", "image", "build"]
+date = local["date"]["--rfc-3339", "ns"]
+tag = local["docker"]["image", "tag"]
+
+# Build base and onbuild images
+build[
+    "--tag",
+    IMAGE_NAME,
+    # See http://label-schema.org/rc1/#build-time-labels
+    "--build-arg",
+    "VCS_REF=%s" % COMMIT,
+    "--build-arg",
+    "BUILD_DATE=%s" % date().strip(),
+    "--build-arg",
+    "VERSION=%s" % VERSION,
+    ROOT,
+] & FG

hooks/push

@@ -0,0 +1,21 @@
+#!/usr/bin/env python3
+from plumbum import FG, local
+from plumbum.cmd import docker  # noqa pylint: disable=import-error
+
+IMAGE_NAME = local.env["IMAGE_NAME"]
+REPO = IMAGE_NAME.split(":")[0]
+
+# Log all locally available images; will help to pin images
+docker["image", "ls", "--digests", REPO] & FG
+
+# Login in Docker Hub
+docker(
+    "login",
+    "--username",
+    local.env["DOCKER_HUB_USERNAME"],
+    "--password",
+    local.env["DOCKER_HUB_TOKEN"],
+)
+
+# Push built image
+docker["image", "push", IMAGE_NAME] & FG

requirements-ci.txt

@@ -1 +1,2 @@
 docker
+plumbum