chore: Push on first build if skip_unchanged_digest isn't set

.dockerignore

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

.github/workflows/pr.yml

@@ -8,4 +8,4 @@ jobs:
     steps:
       - uses: actions/checkout@v1
       - name: Run commitsar
-        uses: docker://commitsar/commitsar
+        uses: docker://aevea/commitsar

.github/workflows/push.yml

@@ -9,7 +9,7 @@ jobs:
       - uses: actions/checkout@master
 
       - name: GitHub Package Registry
-        uses: outillage/kaniko-action@master
+        uses: aevea/action-kaniko@master
         with:
           registry: docker.pkg.github.com
           password: ${{ secrets.GITHUB_TOKEN }}
@@ -18,10 +18,10 @@ jobs:
           cache_registry: cache
 
       - name: Dockerhub
-        uses: outillage/kaniko-action@master
+        uses: aevea/action-kaniko@master
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_PASSWORD }}
-          image: outillage/kaniko
+          image: aevea/kaniko
           cache: true
-          cache_registry: outillage/cache
+          cache_registry: aevea/cache

.github/workflows/release.yml

@@ -13,12 +13,12 @@ jobs:
         uses: actions/checkout@v1
 
       - name: Release Notary Action
-        uses: docker://commitsar/release-notary
+        uses: docker://aevea/release-notary
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - name: GitHub Package Registry
-        uses: outillage/kaniko-action@master
+        uses: aevea/action-kaniko@master
         with:
           registry: docker.pkg.github.com
           password: ${{ secrets.GITHUB_TOKEN }}
@@ -27,10 +27,10 @@ jobs:
           cache_registry: cache
 
       - name: Dockerhub
-        uses: outillage/kaniko-action@master
+        uses: aevea/action-kaniko@master
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_PASSWORD }}
-          image: outillage/kaniko
+          image: aevea/kaniko
           cache: true
-          cache_registry: outillage/cache
+          cache_registry: aevea/cache

Dockerfile

@@ -1,8 +1,23 @@
+FROM alpine as certs
+
+RUN apk --update add ca-certificates
+
 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 --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
@@ -40,7 +40,7 @@ the most used values. So, technically there is a single required argument
 ## 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    |                 |
@@ -52,6 +52,7 @@ the most used values. So, technically there is a single required argument
 | 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    |                 |
 
 **Here is where it gets specific, as the optional arguments become required depending on the registry targeted**
 
@@ -62,7 +63,7 @@ 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 }}
 ```
@@ -72,17 +73,17 @@ 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.
@@ -125,7 +126,7 @@ 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
@@ -136,7 +137,7 @@ with:
   registry: registry.gitlab.com
   username: ${{ secrets.GL_REGISTRY_USERNAME }}
   password: ${{ secrets.GL_REGISTRY_PASSWORD }}
-  image: outillage/kaniko
+  image: aevea/kaniko
   cache: true
 ```
 

action.yml

@@ -41,6 +41,9 @@ inputs:
   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
 runs:
   using: "docker"
   image: "Dockerfile"

entrypoint.sh

@@ -11,18 +11,18 @@ export USERNAME=${INPUT_USERNAME:-$GITHUB_ACTOR}
 export PASSWORD=${INPUT_PASSWORD:-$GITHUB_TOKEN}
 export IMAGE=$IMAGE:$TAG
 
-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"
 
 if [ "$REGISTRY" == "docker.pkg.github.com" ]; then
     IMAGE_NAMESPACE="$(echo $GITHUB_REPOSITORY | tr '[:upper:]' '[:lower:]')"
@@ -45,10 +45,14 @@ export CACHE=$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"
+
+if [ ! -z $INPUT_SKIP_UNCHANGED_DIGEST ]; then
+    export DESTINATION="--no-push --digest-file digest"
+else
+    export DESTINATION="--destination $IMAGE"
+fi
 
 export ARGS="$CACHE $CONTEXT $DOCKERFILE $DESTINATION $INPUT_EXTRA_ARGS"
-echo $ARGS
 
 cat <<EOF >/kaniko/.docker/config.json
 {
@@ -61,4 +65,24 @@ cat <<EOF >/kaniko/.docker/config.json
 }
 EOF
 
-/kaniko/executor $ARGS
+/kaniko/executor --reproducible $ARGS
+
+if [ ! -z $INPUT_SKIP_UNCHANGED_DIGEST ]; then
+    export DIGEST=$(cat digest)
+    export REMOTE=$(reg digest "$IMAGE" | tail -1)
+
+    if [ "$DIGEST" == "$REMOTE" ]; then
+        echo "Digest hasn't changed, skipping, $DIGEST"
+        echo "Done 🎉️"
+        exit 0
+    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 🎉️"
+fi