Demo repo

This is a repository to demonstrate a bug in Gradle Docker Plugin. The issue is that committing a container using DockerCommitImage to create a new image does not seem to tag the newly created image correctly.

Steps to reproduce the bug

(1) Start by making sure there are no images with the test/my-app tag.

❯ docker image ls test/my-app
REPOSITORY   TAG       IMAGE ID   CREATED   SIZE

(2) Run the Gradle build using ./gradlew (which defaults to the demo tasks), that performs the following steps:

:demo
\--- :commit -> the container `test-cont` to a new image with the tag `test/my-app:1.0.0-SNAPSHOT`
     \--- :start -> the container `test-cont`
          \--- :create -> a container with the name `test-cont`
               \--- :build -> an image with the tag `test/my-app:1.0.0` from the included `Dockerfile`

The demo task is finalized by the remove task which removes the test-cont. If everything were to go well, we should see two images within the test/my-app repository, namely 1.0.0 and 1.0.0-SNAPSHOT.

Here's the output of running ./gradlew

❯ ./gradlew

> Task :build
Building image using context '/Users/raju/work/projects/gradle-docker-plugin-issue'.
Using images 'test/my-app:1.0.0'.
Step 1/2 : FROM alpine:3.16
 ---> e66264b98777
Step 2/2 : RUN apk add --no-cache unzip
 ---> Using cache
 ---> 79e6dcbca7e6
Successfully built 79e6dcbca7e6
Successfully tagged test/my-app:1.0.0
Created image with ID '79e6dcbca7e6'.

> Task :create
Created container with ID 'test-cont'.

> Task :start
Starting container with ID 'test-cont'.

> Task :commit
Committing image for container 'test-cont'.
Created image with ID 'sha256:9133d78f56855d38027ffbf04ea9e81c6bab4e3d44d82011728956690eac9e16'.

> Task :remove
Removing container with ID 'test-cont'.

BUILD SUCCESSFUL in 4s
5 actionable tasks: 5 executed

(3) List the images again:

❯  docker image ls test/my-app
REPOSITORY    TAG       IMAGE ID       CREATED         SIZE
test/my-app   1.0.0     79e6dcbca7e6   3 minutes ago   5.86MB

Observations

• Note that while we have test/my-app:1.0.0 successfully built (from the Dockerfile) there is no test/my-app-SNAPSHOT.
• However, the console output does list sha256:9133d78f56855d38027ffbf04ea9e81c6bab4e3d44d82011728956690eac9e16, which does exist—it's just an anonymous image

IMAGE ID       REPOSITORY     TAG         SIZE
9133d78f5685   <none>         <none>      5.86MB

Issue details

You can find the details of the issue I filed against gradle-docker-plugin here