CI: Re-use the built docker image between stages

Author: elgalu

.travis.yml

@@ -28,29 +28,34 @@ env:
 
 jobs:
   include:
+    - stage: Docker build (re-use in stages)
+      env: step=build_push
+      script:
+        - travis_retry ./test/before_install_build
+
     - stage: Integration and Unit Tests
       env: test=scenario_basic__restart
       script:
-        - travis_retry ./test/before_install_build
+        - travis_retry ./test/before_install_pull
         - travis_retry ./test/script_scenario_basic
         - travis_retry ./test/script_scenario_restart
 
     - env: test=scenario_node_dies
       script:
-        - travis_retry ./test/before_install_build
+        - travis_retry ./test/before_install_pull
         - travis_retry ./test/script_scenario_node_dies
 
     - env: test=scenario_make
       script:
-        - travis_retry ./test/before_install_build
+        - travis_retry ./test/before_install_pull
         - travis_retry ./test/script_scenario_make
 
     - env: test=scenario_compose_N_N
       script:
-        - travis_retry ./test/before_install_build
+        - travis_retry ./test/before_install_pull
         - travis_retry ./test/script_scenario_compose_N_N
 
     - stage: Push Image (only with a tag) & Git push
       script:
-        - travis_retry ./test/before_install_build
+        - travis_retry ./test/before_install_pull
         - ./test/script_push

test/before_install_build

@@ -11,3 +11,17 @@ docker-compose --version
 
 docker build -t selenium .
 docker images selenium
+
+if [ "${TRAVIS_BUILD_NUMBER}" != "" ]; then
+  # Let's push this image to re-use it in TravisCI stages
+  # in order to speed up the build
+  docker tag selenium:latest elgalu/build_selenium:${TRAVIS_BUILD_NUMBER}
+
+  [ "${DOCKER_USERNAME}" == "" ] && die "Need env var DOCKER_USERNAME to push to docker"
+  [ "${DOCKER_PASSWORD}" == "" ] && die "Need env var DOCKER_PASSWORD to push to docker"
+
+  docker login -u="${DOCKER_USERNAME}" -p="${DOCKER_PASSWORD}"
+  echo "Logged in to docker with user '${DOCKER_USERNAME}'"
+
+  docker push elgalu/build_selenium:${TRAVIS_BUILD_NUMBER}
+fi

test/before_install_pull

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+# set -e: exit asap if a command exits with a non-zero status
+# set -x: print each command right before it is executed
+set -xe
+
+echoerr() { printf "%s\n" "$*" >&2; }
+
+# print error and exit
+die () {
+  echoerr "ERROR: $1"
+  # if $2 is defined AND NOT EMPTY, use $2; otherwise, set to "150"
+  errnum=${2-133}
+  exit $errnum
+}
+
+docker --version
+docker-compose --version
+
+[ "${TRAVIS_BUILD_NUMBER}" == "" ] && die "Need env var TRAVIS_BUILD_NUMBER to know where to pull from"
+
+docker pull elgalu/build_selenium:${TRAVIS_BUILD_NUMBER}
+docker tag elgalu/build_selenium:${TRAVIS_BUILD_NUMBER} selenium:latest
+docker images selenium

test/script_push

@@ -23,8 +23,12 @@ die () {
 #######################################
 docker_login_tag_push() {
   echo "script_push::docker_login_tag_push"
+
+  [ "${DOCKER_USERNAME}" == "" ] && die "Need env var DOCKER_USERNAME to push to docker"
+  [ "${DOCKER_PASSWORD}" == "" ] && die "Need env var DOCKER_PASSWORD to push to docker"
+
   # -e="$DOCKER_EMAIL"
-  docker login -u="$DOCKER_USERNAME" -p="$DOCKER_PASSWORD"
+  docker login -u="${DOCKER_USERNAME}" -p="${DOCKER_PASSWORD}"
   echo "Logged in to docker with user '${DOCKER_USERNAME}'"
   echo "docker tag and docker push using TRAVIS_TAG=${TRAVIS_TAG}"
   docker tag selenium:latest elgalu/selenium:${TRAVIS_TAG}