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feat: Add option for skip pushing if the digest hasn't changed

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This commit is contained in:
Alex Viscreanu 2020-06-19 13:19:32 +02:00
parent c076596480
commit 3b9302effb
4 changed files with 53 additions and 16 deletions
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15
Dockerfile
View file

@ -1,6 +1,21 @@
FROM alpine as certs
RUN apk --update add ca-certificates
FROM gcr.io/kaniko-project/executor:debug FROM gcr.io/kaniko-project/executor:debug
SHELL ["/busybox/sh", "-c"]
RUN mkdir -p /usr/local/bin && \
wget -O /usr/local/bin/jq \
https://github.com/stedolan/jq/releases/download/jq-1.6/jq-linux64 && \
chmod +x /usr/local/bin/jq && \
wget -O /usr/local/bin/reg \
https://github.com/genuinetools/reg/releases/download/v0.16.1/reg-linux-386 && \
chmod +x /usr/local/bin/reg
COPY entrypoint.sh / COPY entrypoint.sh /
COPY --from=certs /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
ENTRYPOINT ["/entrypoint.sh"] ENTRYPOINT ["/entrypoint.sh"]

27
README.md
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@ -39,19 +39,20 @@ the most used values. So, technically there is a single required argument
## Optional Arguments ## Optional Arguments
| variable | description | required | default | | variable | description | required | default |
|------------------|----------------------------------------------------------|----------|-----------------------------| |-----------------------|-----------------------------------------------------------------|----------|-----------------|
| registry | Docker registry where the image will be pushed | false | docker.io | | registry | Docker registry where the image will be pushed | false | docker.io |
| username | Username used for authentication to the Docker registry | false | $GITHUB_ACTOR | | username | Username used for authentication to the Docker registry | false | $GITHUB_ACTOR |
| password | Password used for authentication to the Docker registry | false | | | password | Password used for authentication to the Docker registry | false | |
| tag | Image tag | false | latest | | tag | Image tag | false | latest |
| cache | Enables build cache | false | false | | cache | Enables build cache | false | false |
| cache_ttl | How long the cache should be considered valid | false | | | cache_ttl | How long the cache should be considered valid | false | |
| cache_registry | Docker registry meant to be used as cache | false | | | cache_registry | Docker registry meant to be used as cache | false | |
| cache_directory | Filesystem path meant to be used as cache | false | | | cache_directory | Filesystem path meant to be used as cache | false | |
| build_file | Dockerfile filename | false | Dockerfile | | build_file | Dockerfile filename | false | Dockerfile |
| extra_args | Additional arguments to be passed to the kaniko executor | false | | | extra_args | Additional arguments to be passed to the kaniko executor | false | |
| strip_tag_prefix | Prefix to be stripped from the tag | false | | | strip_tag_prefix | Prefix to be stripped from the tag | false | |
| skip_unchanged_digest | Avoids pushing the image if the build generated the same digest | false | |
**Here is where it gets specific, as the optional arguments become required depending on the registry targeted** **Here is where it gets specific, as the optional arguments become required depending on the registry targeted**

3
action.yml
View file

@ -41,6 +41,9 @@ inputs:
extra_args: extra_args:
description: "Additional arguments to be passed to the kaniko executor" description: "Additional arguments to be passed to the kaniko executor"
required: false required: false
skip_unchanged_digest:
description: "Avoids pushing the image if the build generated the same digest"
required: false
runs: runs:
using: "docker" using: "docker"
image: "Dockerfile" image: "Dockerfile"

24
entrypoint.sh
View file

@ -45,10 +45,9 @@ export CACHE=$CACHE${INPUT_CACHE_REGISTRY:+" --cache-repo=$INPUT_CACHE_REGISTRY"
export CACHE=$CACHE${INPUT_CACHE_DIRECTORY:+" --cache-dir=$INPUT_CACHE_DIRECTORY"} export CACHE=$CACHE${INPUT_CACHE_DIRECTORY:+" --cache-dir=$INPUT_CACHE_DIRECTORY"}
export CONTEXT="--context $GITHUB_WORKSPACE" export CONTEXT="--context $GITHUB_WORKSPACE"
export DOCKERFILE="--dockerfile ${INPUT_BUILD_FILE:-Dockerfile}" export DOCKERFILE="--dockerfile ${INPUT_BUILD_FILE:-Dockerfile}"
export DESTINATION="--destination $IMAGE" export DESTINATION="--no-push"
export ARGS="$CACHE $CONTEXT $DOCKERFILE $DESTINATION $INPUT_EXTRA_ARGS" export ARGS="$CACHE $CONTEXT $DOCKERFILE $DESTINATION $INPUT_EXTRA_ARGS"
echo $ARGS
cat <<EOF >/kaniko/.docker/config.json cat <<EOF >/kaniko/.docker/config.json
{ {
@ -61,4 +60,23 @@ cat <<EOF >/kaniko/.docker/config.json
} }
EOF EOF
/kaniko/executor $ARGS /kaniko/executor --digest-file digest --reproducible $ARGS
export DIGEST=$(cat digest)
export REMOTE=$(reg digest "$IMAGE" | tail -1)
if [ ! -z $INPUT_SKIP_UNCHANGED_DIGEST ]; then
if [ "$DIGEST" == "$REMOTE" ]; then
echo "Digest hasn't changed, skipping, $DIGEST"
exit 0
fi
fi
export DESTINATION="--destination $IMAGE"
export ARGS="$CACHE $CONTEXT $DOCKERFILE $DESTINATION $INPUT_EXTRA_ARGS"
echo "Pushing image..."
/kaniko/executor --reproducible $ARGS >/dev/null 2>&1
echo "Done 🎉️"