docs: add warning about kaniko lacking maintainers

kaniko outputs each tag on a new line, so users that push multiple tags
at once would get an error as the output wasn't prepared to handle multi-line
text

.github/workflows/pr.yml

@@ -6,6 +6,8 @@ jobs:
     runs-on: ubuntu-latest
     name: Verify commit messages
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
       - name: Run commitsar
-        uses: docker://aevea/commitsar@sha256:caf5539dd03309a539906c7ad45c2ecc0ae86a1ee2bf5dc538d7986c523526f3
+        uses: docker://aevea/commitsar@sha256:e4aed72de9a00b990a53c678ad51fbe9bd04e127a617d10beab0ef0204b1dfa0

.github/workflows/push.yml

@@ -11,7 +11,7 @@ jobs:
       - name: GitHub Package Registry
         uses: aevea/action-kaniko@master
         with:
-          registry: docker.pkg.github.com
+          registry: ghcr.io
           password: ${{ secrets.GITHUB_TOKEN }}
           image: kaniko
           cache: true

.github/workflows/release.yml

@@ -10,17 +10,22 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out code
-        uses: actions/checkout@v1
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
 
       - name: Release Notary Action
-        uses: docker://aevea/release-notary@sha256:5eef3c539deb5397457a6acf001ef80df6004ec52bc4b8a0eac0577ad92759d0
+        uses: docker://aevea/release-notary@sha256:690915bf87458fd8eb1e1ff0be34b33377f920eda3f38b96c62ecbf897c831f4
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          entrypoint: release-notary
+          args: publish
 
       - name: GitHub Package Registry
         uses: aevea/action-kaniko@master
         with:
-          registry: docker.pkg.github.com
+          registry: ghcr.io
           password: ${{ secrets.GITHUB_TOKEN }}
           image: kaniko
           cache: true

Dockerfile

@@ -2,18 +2,18 @@ FROM alpine as certs
 
 RUN apk --update add ca-certificates
 
-FROM gcr.io/kaniko-project/executor:debug
+FROM gcr.io/kaniko-project/executor:v1.23.2-debug
 
 SHELL ["/busybox/sh", "-c"]
 
 RUN wget -O /kaniko/jq \
-    https://github.com/stedolan/jq/releases/download/jq-1.6/jq-linux64 && \
+    https://github.com/jqlang/jq/releases/download/jq-1.7.1/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 \ 
+    wget -O /crane.tar.gz \
-    https://github.com/google/go-containerregistry/releases/download/v0.1.1/go-containerregistry_Linux_x86_64.tar.gz && \
+    https://github.com/google/go-containerregistry/releases/download/v0.17.0/go-containerregistry_Linux_x86_64.tar.gz && \
     tar -xvzf /crane.tar.gz crane -C /kaniko && \
     rm /crane.tar.gz
 

README.md

@@ -1,5 +1,8 @@
 # Kaniko image builder
 
+> [!WARNING]  
+> The kaniko project no longer seems to [have maintainers](https://github.com/GoogleContainerTools/kaniko/issues/3348). Keep this in mind before deciding to use kaniko as your image builder.
+
 This Action uses the [kaniko](https://github.com/GoogleContainerTools/kaniko) executor instead of the docker daemon. Kaniko builds the image
 by extracting the filesystem of the base image, making the changes in the user space, snapshotting any change and appending it to the base
 image filesystem.
@@ -56,6 +59,7 @@ the most used values. So, technically there is a single required argument
 | 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    |                 |
+| debug                 | Enables trace for entrypoint.sh                                 | false    |                 |
 
 **Here is where it gets specific, as the optional arguments become required depending on the registry targeted**
 
@@ -83,7 +87,7 @@ with:
   cache_registry: aevea/cache
 ```
 
-### [docker.pkg.github.com](https://github.com/features/packages)
+### [ghcr.io](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 `aevea/action-kaniko/kaniko`, you'll only need to pass `kaniko` to this action.
@@ -93,7 +97,7 @@ passed by default, it will have to be explicitly set up.
 
 ```yaml
 with:
-  registry: docker.pkg.github.com
+  registry: ghcr.io
   password: ${{ secrets.GITHUB_TOKEN }}
   image: kaniko
 ```
@@ -104,7 +108,7 @@ cache layers to that image instead
 
 ```yaml
 with:
-  registry: docker.pkg.github.com
+  registry: ghcr.io
   password: ${{ secrets.GITHUB_TOKEN }}
   image: kaniko
   cache: true
@@ -167,10 +171,16 @@ Example:
 
 ```yaml
 with:
-  registry: docker.pkg.github.com
+  registry: ghcr.io
   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.
+
+## Outputs
+
+### `image`
+
+Full reference to the built image with registry and tag.

action.yml

@@ -54,6 +54,12 @@ inputs:
   target:
     description: Sets the target stage to build
     required: false
+  debug:
+    description: Enables trace for entrypoint.sh
+    required: false
+outputs:
+  image:
+    description: "Full reference to the built image with registry and tag"
 runs:
   using: "docker"
   image: "Dockerfile"

entrypoint.sh

@@ -1,20 +1,26 @@
 #!/busybox/sh
 set -e pipefail
+if [ "$INPUT_DEBUG" = "true" ]; then
+    set -o xtrace
+fi
 
-export REGISTRY=${INPUT_REGISTRY:-"docker.io"}
+export REGISTRY="${INPUT_REGISTRY:-"docker.io"}"
-export IMAGE=${INPUT_IMAGE}
+export IMAGE="$INPUT_IMAGE"
-export BRANCH=$(echo ${GITHUB_REF} | sed -E "s/refs\/(heads|tags)\///g" | sed -e "s/\//-/g")
+export BRANCH=$(echo "$GITHUB_REF" | sed -E "s/refs\/(heads|tags)\///g" | sed -e "s/\//-/g")
-export TAG=${INPUT_TAG:-$([ "$BRANCH" == "master" ] && echo latest || echo $BRANCH)}
+export TAG=${INPUT_TAG:-$([ "$BRANCH" = "master" ] && echo latest || echo "$BRANCH")}
-export TAG=${TAG:-"latest"}
+export TAG="${TAG:-"latest"}"
-export TAG=${TAG#$INPUT_STRIP_TAG_PREFIX}
+export TAG="${TAG#$INPUT_STRIP_TAG_PREFIX}"
-export USERNAME=${INPUT_USERNAME:-$GITHUB_ACTOR}
+export USERNAME="${INPUT_USERNAME:-$GITHUB_ACTOR}"
-export PASSWORD=${INPUT_PASSWORD:-$GITHUB_TOKEN}
+export PASSWORD="${INPUT_PASSWORD:-$GITHUB_TOKEN}"
-export REPOSITORY=$IMAGE
+export REPOSITORY="$IMAGE"
-export IMAGE_LATEST=${INPUT_TAG_WITH_LATEST:+"$IMAGE:latest"}
+export IMAGE="${IMAGE}:${TAG}"
-export IMAGE=$IMAGE:$TAG
+export CONTEXT_PATH="$INPUT_PATH"
-export CONTEXT_PATH=${INPUT_PATH}
 
-function ensure() {
+if [ "$INPUT_TAG_WITH_LATEST" = "true" ]; then
+    export IMAGE_LATEST="${REPOSITORY}:latest"
+fi
+
+ensure() {
     if [ -z "${1}" ]; then
         echo >&2 "Unable to find the ${2} variable. Did you set with.${2}?"
         exit 1
@@ -28,48 +34,51 @@ ensure "${IMAGE}" "image"
 ensure "${TAG}" "tag"
 ensure "${CONTEXT_PATH}" "path"
 
-if [ "$REGISTRY" == "docker.pkg.github.com" ]; then
+if [ "$REGISTRY" = "ghcr.io" ]; then
     IMAGE_NAMESPACE="$(echo $GITHUB_REPOSITORY | tr '[:upper:]' '[:lower:]')"
-    export IMAGE="$IMAGE_NAMESPACE/$IMAGE"
+    # Set `/` separator, unless image is pre-fixed with dash or slash
-    export REPOSITORY="$IMAGE_NAMESPACE/$REPOSITORY"
+    [ -n "$REPOSITORY" ] && [[ ! "$REPOSITORY" =~ ^[-/] ]] && SEPARATOR="/"
+    export IMAGE="$IMAGE_NAMESPACE$SEPARATOR$IMAGE"
+    export REPOSITORY="$IMAGE_NAMESPACE$SEPARATOR$REPOSITORY"
 
-    if [ ! -z $IMAGE_LATEST ]; then
+    if [ -n "$IMAGE_LATEST" ]; then
-        export IMAGE_LATEST="$IMAGE_NAMESPACE/$IMAGE_LATEST"
+        export IMAGE_LATEST="${IMAGE_NAMESPACE}/${IMAGE_LATEST}"
     fi
 
-    if [ ! -z $INPUT_CACHE_REGISTRY ]; then
+    if [ -n "$INPUT_CACHE_REGISTRY" ]; then
-        export INPUT_CACHE_REGISTRY="$REGISTRY/$IMAGE_NAMESPACE/$INPUT_CACHE_REGISTRY"
+        export INPUT_CACHE_REGISTRY="${REGISTRY}/${IMAGE_NAMESPACE}/${INPUT_CACHE_REGISTRY}"
     fi
 fi
 
-if [ "$REGISTRY" == "docker.io" ]; then
+if [ "$REGISTRY" = "docker.io" ]; then
     export REGISTRY="index.${REGISTRY}/v1/"
 else
-    export IMAGE="$REGISTRY/$IMAGE"
+    export IMAGE="${REGISTRY}/${IMAGE}"
 
-    if [ ! -z $IMAGE_LATEST ]; then
+    if [ -n "$IMAGE_LATEST" ]; then
-        export IMAGE_LATEST="$REGISTRY/$IMAGE_LATEST"
+        export IMAGE_LATEST="${REGISTRY}/${IMAGE_LATEST}"
     fi
 fi
 
-export CACHE=${INPUT_CACHE:+"--cache=true"}
+export CACHE="${INPUT_CACHE:+"--cache=true"}"
-export CACHE=$CACHE${INPUT_CACHE_TTL:+" --cache-ttl=$INPUT_CACHE_TTL"}
+export CACHE="$CACHE"${INPUT_CACHE_TTL:+" --cache-ttl=$INPUT_CACHE_TTL"}
-export CACHE=$CACHE${INPUT_CACHE_REGISTRY:+" --cache-repo=$INPUT_CACHE_REGISTRY"}
+export CACHE="$CACHE"${INPUT_CACHE_REGISTRY:+" --cache-repo=$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 $GITHUB_WORKSPACE/$CONTEXT_PATH"
 export DOCKERFILE="--dockerfile $CONTEXT_PATH/${INPUT_BUILD_FILE:-Dockerfile}"
 export TARGET=${INPUT_TARGET:+"--target=$INPUT_TARGET"}
+export DIGEST="--digest-file /kaniko/digest --image-name-tag-with-digest-file=/kaniko/image-tag-digest"
 
-if [ ! -z $INPUT_SKIP_UNCHANGED_DIGEST ]; then
+if [ -n "$INPUT_SKIP_UNCHANGED_DIGEST" ]; then
-    export DESTINATION="--digest-file digest --tarPath image.tar --destination $IMAGE"
+    export DESTINATION="--no-push --tarPath image.tar --destination $IMAGE"
 else
     export DESTINATION="--destination $IMAGE"
-    if [ ! -z $IMAGE_LATEST ]; then
+    if [ -n "$IMAGE_LATEST" ]; then
-        export DESTINATION="$DESTINATION --destination $IMAGE_LATEST"  
+        export DESTINATION="$DESTINATION --destination $IMAGE_LATEST"
     fi
 fi
 
-export ARGS="$CACHE $CONTEXT $DOCKERFILE $TARGET $DESTINATION $INPUT_EXTRA_ARGS"
+export ARGS="$CACHE $CONTEXT $DOCKERFILE $TARGET $DIGEST $DESTINATION $INPUT_EXTRA_ARGS"
 
 cat <<EOF >/kaniko/.docker/config.json
 {
@@ -82,20 +91,31 @@ cat <<EOF >/kaniko/.docker/config.json
 }
 EOF
 
+# https://github.com/GoogleContainerTools/kaniko/issues/1803
 # https://github.com/GoogleContainerTools/kaniko/issues/1349
-/kaniko/executor --reproducible --force $ARGS
+export IFS=''
+# Removes a trailing new line
+ARGS=$(echo "${ARGS}" | sed 's/\n*$//')
+kaniko_cmd="/kaniko/executor ${ARGS} --reproducible --force"
+echo "Running kaniko command ${kaniko_cmd}"
+eval "${kaniko_cmd}"
 
-if [ ! -z $INPUT_SKIP_UNCHANGED_DIGEST ]; then
+echo "image=$IMAGE" >> "$GITHUB_OUTPUT"
-    export DIGEST=$(cat digest)
+echo "digest=$(cat /kaniko/digest)" >> "$GITHUB_OUTPUT"
+echo "image-tag-digest<<EOF" >>"$GITHUB_OUTPUT"
+echo "$(cat /kaniko/image-tag-digest)" >>"$GITHUB_OUTPUT"
+echo 'EOF' >>"$GITHUB_OUTPUT"
 
-    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
+if [ -n "$INPUT_SKIP_UNCHANGED_DIGEST" ]; then
+    export DIGEST="$(cat /kaniko/digest)"
+
+    /kaniko/crane auth login "$REGISTRY" -u "$USERNAME" -p "$PASSWORD"
+
+    export REMOTE=$(crane digest "${REGISTRY}/${REPOSITORY}:latest")
+
+    if [ "$DIGEST" = "$REMOTE" ]; then
+        echo "refreshed=false" >> "$GITHUB_OUTPUT"
         echo "Digest hasn't changed, skipping, $DIGEST"
         echo "Done 🎉️"
         exit 0
@@ -103,13 +123,13 @@ if [ ! -z $INPUT_SKIP_UNCHANGED_DIGEST ]; then
 
     echo "Pushing image..."
 
-    /kaniko/crane auth login $REGISTRY -u $USERNAME -p $PASSWORD
+    /kaniko/crane push image.tar "$IMAGE"
-    /kaniko/crane push image.tar $IMAGE
 
-    if [ ! -z $IMAGE_LATEST ]; then
+    if [ -n "$IMAGE_LATEST" ]; then
         echo "Tagging latest..."
-        /kaniko/crane tag $IMAGE latest  
+        /kaniko/crane tag "$IMAGE" latest
     fi
- 
+
+    echo "refreshed=false" >> "$GITHUB_OUTPUT"
     echo "Done 🎉️"
 fi