exercise3

Excercise 3:

You're given the following Dockerfile:

FROM alpine:3.19.1

RUN apk update && apk add --no-cache \
    curl \
    jq

ARG website_url="https://jsonplaceholder.typicode.com/posts"

RUN curl ${website_url} | grep "title" | sort | uniq > titles.txt

CMD [ "sh","-c","cat titles.txt" ]

You tried building the image as shown below and we could see that build is successful

You then tried running the image built and it successfully printed out the titles it generated.

However, when you provided a dummy URL as a build argument to test the build process, the build did not fail as expected.

docker build --build-arg=website_url=https://jsonplaceholder.nonexistent.com/posts -t exercise3:0.1 .

You are surprised that build is not failed and successfully created the image but you wanted the build to fail because the URL you gave is non-existent and you expected an error similar to below

Task:

Make the build process fail when the URL provided isn't right

Expected outcome:

• When you run the build without providing any build arguments, it should use the default argument value for the website URL and succeed in building the image.
• When you provide a dummy URL, the build process should fail.