Added 'docker login' to fix pull rate limit issue (#6)

Author: keshayad

README.md

@@ -141,6 +141,18 @@ Then,
 * to run integration tests: `make test-integ`
 * to run smoke tests: `make test-smoke`
 
+### Troubleshooting
+While running integration tests, you might encounter the Docker Hub rate limit error with the following body:
+```
+You have reached your pull rate limit. You may increase the limit by authenticating and upgrading: https://www.docker.com/increase-rate-limits
+```
+To fix the above issue, consider authenticating to a Docker Hub account by setting the Docker Hub credentials as below CodeBuild environment variables.
+```shell script
+DOCKERHUB_USERNAME=<dockerhub username>
+DOCKERHUB_PASSWORD=<dockerhub password>
+```
+Recommended way is to set the Docker Hub credentials in CodeBuild job by retrieving them from AWS Secrets Manager.
+
 ## Security
 
 If you discover a potential security issue in this project we ask that you notify AWS/Amazon Security via our [vulnerability reporting page](http://aws.amazon.com/security/vulnerability-reporting/). Please do **not** create a public github issue.

test/integration/codebuild/buildspec.os.alpine.yml

@@ -39,6 +39,14 @@ phases:
       - >
         echo "COPY ${SCRATCH_DIR}/aws-lambda-rie /usr/bin/aws-lambda-rie" >> \
           "${SCRATCH_DIR}/Dockerfile.echo.${OS_DISTRIBUTION}.tmp"
+      - >
+        if [[ -z "${DOCKERHUB_USERNAME}" && -z "${DOCKERHUB_PASSWORD}" ]];
+        then
+            echo "DockerHub credentials not set as CodeBuild environment variables. Continuing without docker login."
+        else
+            echo "Performing DockerHub login . . ."
+            docker login -u $DOCKERHUB_USERNAME -p $DOCKERHUB_PASSWORD
+        fi
       - echo "Building image ${IMAGE_TAG}"
       - >
         docker build . \

test/integration/codebuild/buildspec.os.amazonlinux.yml

@@ -35,6 +35,14 @@ phases:
       - >
         echo "COPY ${SCRATCH_DIR}/aws-lambda-rie /usr/bin/aws-lambda-rie" >> \
           "${SCRATCH_DIR}/Dockerfile.echo.${OS_DISTRIBUTION}.tmp"
+      - >
+        if [[ -z "${DOCKERHUB_USERNAME}" && -z "${DOCKERHUB_PASSWORD}" ]];
+        then
+            echo "DockerHub credentials not set as CodeBuild environment variables. Continuing without docker login."
+        else
+            echo "Performing DockerHub login . . ."
+            docker login -u $DOCKERHUB_USERNAME -p $DOCKERHUB_PASSWORD
+        fi
       - echo "Building image ${IMAGE_TAG}"
       - >
         docker build . \

test/integration/codebuild/buildspec.os.centos.yml

@@ -36,6 +36,14 @@ phases:
       - >
         echo "COPY ${SCRATCH_DIR}/aws-lambda-rie /usr/bin/aws-lambda-rie" >> \
           "${SCRATCH_DIR}/Dockerfile.echo.${OS_DISTRIBUTION}.tmp"
+      - >
+        if [[ -z "${DOCKERHUB_USERNAME}" && -z "${DOCKERHUB_PASSWORD}" ]];
+        then
+            echo "DockerHub credentials not set as CodeBuild environment variables. Continuing without docker login."
+        else
+            echo "Performing DockerHub login . . ."
+            docker login -u $DOCKERHUB_USERNAME -p $DOCKERHUB_PASSWORD
+        fi
       - echo "Building image ${IMAGE_TAG}"
       - >
         docker build . \

test/integration/codebuild/buildspec.os.debian.yml

@@ -35,6 +35,14 @@ phases:
       - >
         echo "COPY ${SCRATCH_DIR}/aws-lambda-rie /usr/bin/aws-lambda-rie" >> \
           "${SCRATCH_DIR}/Dockerfile.echo.${OS_DISTRIBUTION}.tmp"
+      - >
+        if [[ -z "${DOCKERHUB_USERNAME}" && -z "${DOCKERHUB_PASSWORD}" ]];
+        then
+            echo "DockerHub credentials not set as CodeBuild environment variables. Continuing without docker login."
+        else
+            echo "Performing DockerHub login . . ."
+            docker login -u $DOCKERHUB_USERNAME -p $DOCKERHUB_PASSWORD
+        fi
       - echo "Building image ${IMAGE_TAG}"
       - >
         docker build . \

test/integration/codebuild/buildspec.os.ubuntu.yml

@@ -39,6 +39,14 @@ phases:
       - >
         echo "COPY ${SCRATCH_DIR}/aws-lambda-rie /usr/bin/aws-lambda-rie" >> \
           "${SCRATCH_DIR}/Dockerfile.echo.${OS_DISTRIBUTION}.tmp"
+      - >
+        if [[ -z "${DOCKERHUB_USERNAME}" && -z "${DOCKERHUB_PASSWORD}" ]];
+        then
+            echo "DockerHub credentials not set as CodeBuild environment variables. Continuing without docker login."
+        else
+            echo "Performing DockerHub login . . ."
+            docker login -u $DOCKERHUB_USERNAME -p $DOCKERHUB_PASSWORD
+        fi
       - echo "Building image ${IMAGE_TAG}"
       - >
         docker build . \