Tests: CI: Add logic for untrusted PRs

Author: elgalu

CHANGELOG.md

@@ -10,6 +10,7 @@ Note image ids also change after scm-source.json has being updated which trigger
 ## TBD_DOCKER_TAG
  + **Changes:** https://github.com/elgalu/docker-selenium/compare/3.5.3-p8...3.5.3-p9 (TBD_DATE)
     + Tests: Upgrade python bindings from 3.5.0 to selenium==3.6.0
+    + Tests: CI: Add logic for untrusted PRs
  + **Image tag details:**
     + Selenium version: TBD_SELENIUM_3_VERSION (TBD_SELENIUM_3_REVISION)
     + Chrome stable:  TBD_CHROME_STABLE

test/before_install_build

@@ -7,8 +7,14 @@ set -xe
 docker --version
 docker-compose --version
 
-./host-scripts/gen-scm-source.sh
+if [[ ${TRAVIS_PULL_REQUEST_SLUG} != "" && \
+      ${TRAVIS_PULL_REQUEST_SLUG} != ${TRAVIS_REPO_SLUG} && \
+      ${TRAVIS_PULL_REQUEST} != "false" ]]; then
+  echo "WARN: External PRs are untrusted by default therefore we need can't reuse and push the image"
+  exit 0
+fi
 
+./host-scripts/gen-scm-source.sh
 docker build -t selenium .
 docker images selenium
 

test/before_install_pull

@@ -19,6 +19,15 @@ 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
+if [[ ${TRAVIS_PULL_REQUEST_SLUG} != "" && \
+      ${TRAVIS_PULL_REQUEST_SLUG} != ${TRAVIS_REPO_SLUG} && \
+      ${TRAVIS_PULL_REQUEST} != "false" ]]; then
+  echo "WARN: External PRs are untrusted by default therefore we need can't reuse and pull the image so building it from scratch..."
+  ./host-scripts/gen-scm-source.sh
+  docker build -t selenium .
+else
+  docker pull elgalu/build_selenium:${TRAVIS_BUILD_NUMBER}
+  docker tag elgalu/build_selenium:${TRAVIS_BUILD_NUMBER} selenium:latest
+fi
+
 docker images selenium