refactor: Use google/go-containerregistry to push image

When skipping the push on unchanged digests, it's not enough to push the current tag,
which is probably semver, we also need to push the latest, so we can later check if
the latest digest equals the currently built image

.dockerignore

@@ -1,3 +1,3 @@
 *
 !entrypoint.sh
-
+.env*

.github/workflows/pr.yml

@@ -0,0 +1,11 @@
+name: Pull request
+on: pull_request
+
+jobs:
+  commitsar:
+    runs-on: ubuntu-latest
+    name: Verify commit messages
+    steps:
+      - uses: actions/checkout@v1
+      - name: Run commitsar
+        uses: docker://aevea/commitsar

.github/workflows/push.yml

@@ -0,0 +1,27 @@
+name: Commit
+on: push
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    name: Build docker image
+    steps:
+      - uses: actions/checkout@master
+
+      - name: GitHub Package Registry
+        uses: aevea/action-kaniko@master
+        with:
+          registry: docker.pkg.github.com
+          password: ${{ secrets.GITHUB_TOKEN }}
+          image: kaniko
+          cache: true
+          cache_registry: cache
+
+      - name: Dockerhub
+        uses: aevea/action-kaniko@master
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+          image: aevea/kaniko
+          cache: true
+          cache_registry: aevea/cache

.github/workflows/release.yml

@@ -0,0 +1,36 @@
+name: Release
+on:
+  push:
+    tags:
+      - "v*"
+
+jobs:
+  release-notes:
+    name: Release Notes
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v1
+
+      - name: Release Notary Action
+        uses: docker://aevea/release-notary
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: GitHub Package Registry
+        uses: aevea/action-kaniko@master
+        with:
+          registry: docker.pkg.github.com
+          password: ${{ secrets.GITHUB_TOKEN }}
+          image: kaniko
+          cache: true
+          cache_registry: cache
+
+      - name: Dockerhub
+        uses: aevea/action-kaniko@master
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+          image: aevea/kaniko
+          cache: true
+          cache_registry: aevea/cache

Dockerfile

@@ -1,8 +1,26 @@
+FROM alpine as certs
+
+RUN apk --update add ca-certificates
+
 FROM gcr.io/kaniko-project/executor:debug
 
+SHELL ["/busybox/sh", "-c"]
+
+RUN wget -O /kaniko/jq \
+    https://github.com/stedolan/jq/releases/download/jq-1.6/jq-linux64 && \
+    chmod +x /kaniko/jq && \
+    wget -O /kaniko/reg \
+    https://github.com/genuinetools/reg/releases/download/v0.16.1/reg-linux-386 && \
+    chmod +x /kaniko/reg && \
+    wget -O /crane.tar.gz \ 
+    https://github.com/google/go-containerregistry/releases/download/v0.1.1/go-containerregistry_Linux_x86_64.tar.gz && \
+    tar -xvzf /crane.tar.gz crane -C /kaniko && \
+    rm crane.tar.gz
+
 COPY entrypoint.sh /
+COPY --from=certs /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
 
 ENTRYPOINT ["/entrypoint.sh"]
 
-LABEL repository="https://github.com/outillage/action-kaniko" \
+LABEL repository="https://github.com/aevea/action-kaniko" \
     maintainer="Alex Viscreanu <alexviscreanu@gmail.com>"

Makefile

@@ -0,0 +1,24 @@
+build:
+	docker build -t aevea/kaniko .
+
+run: build
+	docker run \
+		-v $(shell pwd):/tmp \
+		-e GITHUB_REPOSITORY \
+		-e GITHUB_REF \
+		-e GITHUB_ACTOR \
+		-e GITHUB_TOKEN \
+		-e GITHUB_WORKSPACE="/tmp" \
+		-e INPUT_IMAGE \
+		-e INPUT_CACHE \
+		-e INPUT_CACHE_TTL \
+		-e INPUT_CACHE_REGISTRY \
+		-e INPUT_STRIP_TAG_PREFIX \
+		-e INPUT_SKIP_UNCHANGED_DIGEST \
+	aevea/kaniko
+
+shell: build
+	docker run \
+		-ti \
+		--entrypoint sh \
+	aevea/kaniko

README.md

@@ -19,13 +19,13 @@ jobs:
     steps:
       - uses: actions/checkout@master
       - name: Kaniko build
-        uses: outillage/kaniko-action@master
+        uses: aevea/action-kaniko@master
         with:
-          image: outillage/kaniko
+          image: aevea/kaniko
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_PASSWORD }}
           cache: true
-          cache_registry: outillage/cache
+          cache_registry: aevea/cache
 ```
 
 ## Required Arguments
@@ -33,24 +33,29 @@ jobs:
 This action aims to be as flexible as possible, so it tries to define the defaults as for what I thought of being
 the most used values. So, technically there is a single required argument
 
-| variable        | description                                              | required | default                     |
-|-----------------|----------------------------------------------------------|----------|-----------------------------|
-| image           | Name of the image you would like to push                 | true     |                             |
+| variable         | description                                              | required | default                     |
+|------------------|----------------------------------------------------------|----------|-----------------------------|
+| image            | Name of the image you would like to push                 | true     |                             |
 
 ## Optional Arguments
 
-| variable        | description                                              | required | default                     |
-|-----------------|----------------------------------------------------------|----------|-----------------------------|
-| registry        | Docker registry where the image will be pushed           | false    | docker.io                   |
-| username        | Username used for authentication to the Docker registry  | false    | $GITHUB_ACTOR               |
-| password        | Password used for authentication to the Docker registry  | false    |                             |
-| tag             | Image tag                                                | false    | latest                      |
-| cache           | Enables build cache                                      | false    | false                       |
-| cache_ttl       | How long the cache should be considered valid            | false    |                             |
-| cache_registry  | Docker registry meant to be used as cache                | false    |                             |
-| cache_directory | Filesystem path meant to be used as cache                | false    |                             |
-| build_file      | Dockerfile filename                                      | false    | Dockerfile                  |
-| extra_args      | Additional arguments to be passed to the kaniko executor | false    |                             |
+| variable              | description                                                     | required | default         |
+|-----------------------|-----------------------------------------------------------------|----------|-----------------|
+| registry              | Docker registry where the image will be pushed                  | false    | docker.io       |
+| username              | Username used for authentication to the Docker registry         | false    | $GITHUB_ACTOR   |
+| password              | Password used for authentication to the Docker registry         | false    |                 |
+| tag                   | Image tag                                                       | false    | latest          |
+| cache                 | Enables build cache                                             | false    | false           |
+| cache_ttl             | How long the cache should be considered valid                   | false    |                 |
+| cache_registry        | Docker registry meant to be used as cache                       | false    |                 |
+| cache_directory       | Filesystem path meant to be used as cache                       | false    |                 |
+| build_file            | Dockerfile filename                                             | false    | Dockerfile      |
+| extra_args            | Additional arguments to be passed to the kaniko executor        | 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    |                 |
+| path                  | Path to the build context. Defaults to `.`                      | false    | .               |
+| tag_with_latest       | Tags the built image with additional latest tag                 | false    |                 |
+| target                | Sets the target stage to build                                  | false    |                 |
 
 **Here is where it gets specific, as the optional arguments become required depending on the registry targeted**
 
@@ -61,7 +66,7 @@ In this case, the authentication credentials need to be passed via GitHub Action
 
 ```yaml
 with:
-  image: outillage/kaniko
+  image: aevea/kaniko
   username: ${{ secrets.DOCKERHUB_USERNAME }}
   password: ${{ secrets.DOCKERHUB_PASSWORD }}
 ```
@@ -71,17 +76,17 @@ doesn't work. If you want to use caching with Dockerhub, create a `cache` reposi
 
 ```yaml
 with:
-  image: outillage/kaniko
+  image: aevea/kaniko
   username: ${{ secrets.DOCKERHUB_USERNAME }}
   password: ${{ secrets.DOCKERHUB_PASSWORD }}
   cache: true
-  cache_registry: outillage/cache
+  cache_registry: aevea/cache
 ```
 
 ### [docker.pkg.github.com](https://github.com/features/packages)
 
 GitHub's docker registry is a bit special. It doesn't allow top-level images, so this action will prefix any image with the GitHub namespace.
-If you want to push your image like `outillage/kaniko-action/kaniko`, you'll only need to pass `kaniko` to this action.
+If you want to push your image like `aevea/action-kaniko/kaniko`, you'll only need to pass `kaniko` to this action.
 
 The authentication is automatically done using the `GITHUB_ACTOR` and `GITHUB_TOKEN` provided from GitHub itself. But as `GITHUB_TOKEN` is not
 passed by default, it will have to be explicitly set up.
@@ -124,7 +129,7 @@ with:
   registry: registry.gitlab.com
   username: ${{ secrets.GL_REGISTRY_USERNAME }}
   password: ${{ secrets.GL_REGISTRY_PASSWORD }}
-  image: outillage/kaniko
+  image: aevea/kaniko
 ```
 
 > NOTE: As GitLab's registry does support namespacing, Kaniko can natively push cached layers to it, so only `cache: true` is necessary to be
@@ -135,7 +140,7 @@ with:
   registry: registry.gitlab.com
   username: ${{ secrets.GL_REGISTRY_USERNAME }}
   password: ${{ secrets.GL_REGISTRY_PASSWORD }}
-  image: outillage/kaniko
+  image: aevea/kaniko
   cache: true
 ```
 
@@ -154,3 +159,18 @@ If you would like to publish the image to other registries, these actions might
 
 The `tag` argument, **unless overridden**, is automatically guessed based on the branch name. If the branch is `master` then the tag will
 be `latest`, otherwise it will keep the branch name, but replacing any forward slash (/) with a hyphen (-).
+
+If the `v` prefix that it's usually added to the GitHub releases is not desired when pushed to dockerhub, the `strip_tag_prefix` allows to
+specify which part of the tag should be removed.
+
+Example:
+
+```yaml
+with:
+  registry: docker.pkg.github.com
+  password: ${{ secrets.GITHUB_TOKEN }}
+  image: kaniko
+  strip_tag_prefix: pre-
+```
+
+for the tag `pre-0.1` will push `kaniko:0.1`, as the `pre-` part will be stripped from the tag name.

action.yml

@@ -5,6 +5,10 @@ branding:
   icon: anchor
   color: orange
 inputs:
+  path:
+    description: Path to the build context
+    required: false
+    default: "."
   registry:
     description: "Docker registry where the image will be pushed"
     required: false
@@ -35,9 +39,21 @@ inputs:
   build_file:
     description: "Dockerfile filename"
     required: false
+  strip_tag_prefix:
+    description: "Prefix to be stripped from the tag"
+    required: false
   extra_args:
     description: "Additional arguments to be passed to the kaniko executor"
     required: false
+  skip_unchanged_digest:
+    description: "Avoids pushing the image if the build generated the same digest"
+    required: false
+  tag_with_latest:
+    description: "Tags the built image with additional latest tag"
+    required: false
+  target:
+    description: Sets the target stage to build
+    required: false
 runs:
   using: "docker"
   image: "Dockerfile"

entrypoint.sh

@@ -3,31 +3,42 @@ set -e pipefail
 
 export REGISTRY=${INPUT_REGISTRY:-"docker.io"}
 export IMAGE=${INPUT_IMAGE}
-export BRANCH=$(echo ${GITHUB_REF} | sed -e "s/refs\/heads\///g" | sed -e "s/\//-/g")
+export BRANCH=$(echo ${GITHUB_REF} | sed -E "s/refs\/(heads|tags)\///g" | sed -e "s/\//-/g")
 export TAG=${INPUT_TAG:-$([ "$BRANCH" == "master" ] && echo latest || echo $BRANCH)}
 export TAG=${TAG:-"latest"}
+export TAG=${TAG#$INPUT_STRIP_TAG_PREFIX}
 export USERNAME=${INPUT_USERNAME:-$GITHUB_ACTOR}
 export PASSWORD=${INPUT_PASSWORD:-$GITHUB_TOKEN}
+export REPOSITORY=$IMAGE
+export IMAGE_LATEST=${INPUT_TAG_WITH_LATEST:+"$IMAGE:latest"}
 export IMAGE=$IMAGE:$TAG
+export CONTEXT_PATH=${INPUT_PATH}
 
-function sanitize() {
+function ensure() {
     if [ -z "${1}" ]; then
-        echo >&2 "Unable to find the ${2}. Did you set with.${2}?"
+        echo >&2 "Unable to find the ${2} variable. Did you set with.${2}?"
         exit 1
     fi
 }
 
-sanitize "${REGISTRY}" "registry"
-sanitize "${USERNAME}" "username"
-sanitize "${PASSWORD}" "password"
-sanitize "${IMAGE}" "image"
-sanitize "${TAG}" "tag"
+ensure "${REGISTRY}" "registry"
+ensure "${USERNAME}" "username"
+ensure "${PASSWORD}" "password"
+ensure "${IMAGE}" "image"
+ensure "${TAG}" "tag"
+ensure "${CONTEXT_PATH}" "path"
 
 if [ "$REGISTRY" == "docker.pkg.github.com" ]; then
-    export IMAGE="$GITHUB_REPOSITORY/$IMAGE"
+    IMAGE_NAMESPACE="$(echo $GITHUB_REPOSITORY | tr '[:upper:]' '[:lower:]')"
+    export IMAGE="$IMAGE_NAMESPACE/$IMAGE"
+    export REPOSITORY="$IMAGE_NAMESPACE/$REPOSITORY"
 
-    if [ -z $INPUT_CACHE_REGISTRY ]; then
-        export INPUT_CACHE_REGISTRY="$GITHUB_REPOSITORY/$INPUT_CACHE_REGISTRY"
+    if [ ! -z $IMAGE_LATEST ]; then
+        export IMAGE_LATEST="$IMAGE_NAMESPACE/$IMAGE_LATEST"
+    fi
+
+    if [ ! -z $INPUT_CACHE_REGISTRY ]; then
+        export INPUT_CACHE_REGISTRY="$REGISTRY/$IMAGE_NAMESPACE/$INPUT_CACHE_REGISTRY"
     fi
 fi
 
@@ -35,18 +46,30 @@ if [ "$REGISTRY" == "docker.io" ]; then
     export REGISTRY="index.${REGISTRY}/v1/"
 else
     export IMAGE="$REGISTRY/$IMAGE"
+
+    if [ ! -z $IMAGE_LATEST ]; then
+        export IMAGE_LATEST="$REGISTRY/$IMAGE_LATEST"
+    fi
 fi
 
 export CACHE=${INPUT_CACHE:+"--cache=true"}
 export CACHE=$CACHE${INPUT_CACHE_TTL:+" --cache-ttl=$INPUT_CACHE_TTL"}
 export CACHE=$CACHE${INPUT_CACHE_REGISTRY:+" --cache-repo=$INPUT_CACHE_REGISTRY"}
 export CACHE=$CACHE${INPUT_CACHE_DIRECTORY:+" --cache-dir=$INPUT_CACHE_DIRECTORY"}
-export CONTEXT="--context $GITHUB_WORKSPACE"
-export DOCKERFILE="--dockerfile ${INPUT_BUILD_FILE:-Dockerfile}"
-export DESTINATION="--destination $IMAGE"
+export CONTEXT="--context $GITHUB_WORKSPACE/$CONTEXT_PATH"
+export DOCKERFILE="--dockerfile $CONTEXT_PATH/${INPUT_BUILD_FILE:-Dockerfile}"
+export TARGET=${INPUT_TARGET:+"--target=$INPUT_TARGET"}
 
-export ARGS="$CACHE $CONTEXT $DOCKERFILE $DESTINATION $INPUT_EXTRA_ARGS"
-echo $ARGS
+if [ ! -z $INPUT_SKIP_UNCHANGED_DIGEST ]; then
+    export DESTINATION="--digest-file digest --tarPath image.tar --destination $IMAGE"
+else
+    export DESTINATION="--destination $IMAGE"
+    if [ ! -z $IMAGE_LATEST ]; then
+        export DESTINATION="$DESTINATION --destination $IMAGE_LATEST"  
+    fi
+fi
+
+export ARGS="$CACHE $CONTEXT $DOCKERFILE $TARGET $DESTINATION $INPUT_EXTRA_ARGS"
 
 cat <<EOF >/kaniko/.docker/config.json
 {
@@ -59,4 +82,34 @@ cat <<EOF >/kaniko/.docker/config.json
 }
 EOF
 
-/kaniko/executor $ARGS
+# https://github.com/GoogleContainerTools/kaniko/issues/1349
+/kaniko/executor --reproducible --force $ARGS
+
+if [ ! -z $INPUT_SKIP_UNCHANGED_DIGEST ]; then
+    export DIGEST=$(cat digest)
+
+    if [ "$REGISTRY" == "docker.pkg.github.com" ]; then
+        wget -q -O manifest --header "Authorization: Basic $(echo -n $USERNAME:$PASSWORD | base64)" https://docker.pkg.github.com/v2/$REPOSITORY/manifests/latest || true
+        export REMOTE="sha256:$(cat manifest | sha256sum | awk '{ print $1 }')"
+    else
+        export REMOTE=$(reg digest -u $USERNAME -p $PASSWORD $REGISTRY/$REPOSITORY | tail -1)
+    fi
+
+    if [ "$DIGEST" == "$REMOTE" ]; then
+        echo "Digest hasn't changed, skipping, $DIGEST"
+        echo "Done 🎉️"
+        exit 0
+    fi
+
+    echo "Pushing image..."
+
+    /kaniko/crane auth login $REGISTRY -u $USERNAME -p $PASSWORD
+    /kaniko/crane push image.tar $IMAGE
+
+    if [ ! -z $IMAGE_LATEST ]; then
+        echo "Tagging latest..."
+        /kaniko/crane tag $IMAGE latest  
+    fi
+ 
+    echo "Done 🎉️"
+fi

renovate.json

@@ -0,0 +1,5 @@
+{
+  "extends": [
+    "config:base"
+  ]
+}