Add feature to push manifest (#55)

* Add feature to push manifest

Signed-off-by: divyansh42 <diagrawa@redhat.com>

.github/workflows/manifest-build-push.yaml

@@ -0,0 +1,75 @@
+# This workflow will perform a test whenever there
+# is some change in code done to ensure that the changes
+# are not buggy and we are getting the desired output.
+name: Build and Push Manifest
+on:
+  push:
+  workflow_dispatch:
+  schedule:
+    - cron: '0 0 * * *'  # every day at midnight
+
+env:
+  IMAGE_NAME: ptr-manifest
+  IMAGE_TAGS: v1 ${{ github.sha }}
+  IMAGE_REGISTRY: quay.io
+  IMAGE_NAMESPACE: redhat-github-actions
+
+jobs:
+  push-quay:
+    name: Build and push manifest
+    runs-on: ubuntu-20.04
+    strategy:
+      fail-fast: false
+      matrix:
+        install_latest: [ true, false ]
+
+    steps:
+      # Checkout push-to-registry action github repository
+      - name: Checkout Push to Registry action
+        uses: actions/checkout@v2
+
+      - name: Install latest podman
+        if: matrix.install_latest
+        run: |
+          bash .github/install_latest_podman.sh
+
+      - name: Install qemu dependency
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y qemu-user-static
+
+      - name: Create Containerfile
+        run: |
+          cat > Containerfile<<EOF
+
+          FROM docker.io/alpine:3.14
+
+          RUN echo "hello world"
+
+          ENTRYPOINT [ "sh", "-c", "echo -n 'Machine: ' && uname -m && echo -n 'Bits: ' && getconf LONG_BIT && echo 'goodbye world'" ]
+          EOF
+
+      - name: Build Image
+        id: build_image
+        uses: redhat-actions/buildah-build@main
+        with:
+          image: ${{ env.IMAGE_NAME }}
+          tags: ${{ env.IMAGE_TAGS }}
+          archs: amd64, arm64
+          containerfiles: |
+            ./Containerfile
+
+      # Push the image manifest to Quay.io (Image Registry)
+      - name: Push To Quay
+        uses: ./
+        id: push
+        with:
+          image: ${{ steps.build_image.outputs.image }}
+          tags: ${{ steps.build_image.outputs.tags }}
+          registry: ${{ env.IMAGE_REGISTRY }}/${{ env.IMAGE_NAMESPACE }}
+          username: ${{ secrets.REGISTRY_USER }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+
+      - name: Echo outputs
+        run: |
+          echo "${{ toJSON(steps.push.outputs) }}"

README.md

@@ -12,7 +12,7 @@
 [![license badge](https://img.shields.io/github/license/redhat-actions/push-to-registry)](./LICENSE)
 [![size badge](https://img.shields.io/github/size/redhat-actions/push-to-registry/dist/index.js)](./dist)
 
-Push-to-registry is a GitHub Action for pushing a container image to an image registry, such as Dockerhub, quay.io, the GitHub Container Registry, or an OpenShift integrated registry.
+Push-to-registry is a GitHub Action for pushing a container image or an [image manifest](https://github.com/containers/buildah/blob/main/docs/buildah-manifest.1.md) to an image registry, such as Dockerhub, quay.io, the GitHub Container Registry, or an OpenShift integrated registry.
 
 This action only runs on Linux, as it uses [podman](https://github.com/containers/Podman) to perform the push. [GitHub's Ubuntu action runners](https://github.com/actions/virtual-environments#available-environments) come with Podman preinstalled. If you are not using those runners, you must first [install Podman](https://podman.io/getting-started/installation).
 
@@ -24,8 +24,8 @@ Refer to the [`podman push`](http://docs.podman.io/en/latest/markdown/podman-man
 
 | Input Name | Description | Default |
 | ---------- | ----------- | ------- |
-| image	| Name of the image you want to push. Eg. `username/imagename` or `imagename`. Refer to [Image and Tag Inputs](https://github.com/redhat-actions/push-to-registry#image-tag-inputs). | **Required** - unless all tags include registry and image name
-| tags | The tag or tags of the image to push. For multiple tags, separate by whitespace. Refer to [Image and Tag Inputs](https://github.com/redhat-actions/push-to-registry#image-tag-inputs). | `latest`
+| image	| Name of the image or manifest you want to push. Eg. `username/imagename` or `imagename`. Refer to [Image and Tag Inputs](https://github.com/redhat-actions/push-to-registry#image-tag-inputs). | **Required** - unless all tags include registry and image name
+| tags | The tag or tags of the image or manifest to push. For multiple tags, separate by whitespace. Refer to [Image and Tag Inputs](https://github.com/redhat-actions/push-to-registry#image-tag-inputs). | `latest`
 | registry | Hostname and optional namespace to push the image to. Eg. `quay.io` or `quay.io/username`. Refer to [Image and Tag Inputs](https://github.com/redhat-actions/push-to-registry#image-tag-inputs). | **Required** - unless all tags include registry and image name
 | username | Username with which to authenticate to the registry. Required unless already logged in to the registry. | None
 | password | Password, encrypted password, or access token to use to log in to the registry. Required unless already logged in to the registry. | None
@@ -83,6 +83,12 @@ For example:
 
 `registry-path`: The first element of `registry-paths`, as a string.
 
+## Pushing Manifest
+
+If multiple tags are provided, either all tags must point to manifests, or none of them. i.e., you cannot push both manifests are regular images in one `push-to-registry` step.
+
+Refer to [Manifest Build and Push example](./.github/workflows/manifest-build-push.yaml) for a sophisticated example of building and pushing a manifest.
+
 ## Examples
 
 The example below shows how the `push-to-registry` action can be used to push an image created by the [**buildah-build**](https://github.com/redhat-actions/buildah-build) action.

action.yml

@@ -6,10 +6,12 @@ branding:
   color: red
 inputs:
   image:
-    description: 'Name of the image to push (e.g. username/imagename or imagename)'
+    description: 'Name of the image/manifest to push (e.g. username/imagename or imagename)'
     required: false
   tags:
-    description: 'The tag or tags of the image to push. For multiple tags, seperate by whitespace. For example, "latest v1"'
+    description: |
+      'The tag or tags of the image/manifest to push.
+      For multiple tags, seperate by whitespace. For example, "latest v1"'
     required: false
     default: 'latest'
   registry:
@@ -39,7 +41,7 @@ inputs:
 
 outputs:
   digest:
-    description: 'The pushed image digest, as written to the "digestfile"'
+    description: 'The pushed image/manifest digest, as written to the "digestfile"'
   registry-path:
     description: 'The first element of registry-paths.'
   registry-paths:

src/generated/inputs-outputs.ts

@@ -16,7 +16,7 @@ export enum Inputs {
      */
     EXTRA_ARGS = "extra-args",
     /**
-     * Name of the image to push (e.g. username/imagename or imagename)
+     * Name of the image/manifest to push (e.g. username/imagename or imagename)
      * Required: false
      * Default: None.
      */
@@ -34,7 +34,8 @@ export enum Inputs {
      */
     REGISTRY = "registry",
     /**
-     * The tag or tags of the image to push. For multiple tags, seperate by whitespace. For example, "latest v1"
+     * 'The tag or tags of the image/manifest to push.
+     * For multiple tags, seperate by whitespace. For example, "latest v1"'
      * Required: false
      * Default: "latest"
      */
@@ -55,7 +56,7 @@ export enum Inputs {
 
 export enum Outputs {
     /**
-     * The pushed image digest, as written to the "digestfile"
+     * The pushed image/manifest digest, as written to the "digestfile"
      * Required: false
      * Default: None.
      */

src/index.ts

@@ -107,7 +107,11 @@ async function run(): Promise<void> {
     }
 
     const registryPathList: string[] = [];
+    // here
+    // check if provided image is manifest or not
+    const isManifest = await checkIfManifestsExists();
 
+    if (!isManifest) {
         // check if image with all the required tags exist in Podman image storage
         const podmanImageStorageCheckResult: ImageStorageCheckResult = await checkImageInPodman();
 
@@ -188,6 +192,7 @@ async function run(): Promise<void> {
                     + `image storage. The image(s) will be pushed from Podman image storage.`
             );
         }
+    }
 
     let pushMsg = `⏳ Pushing "${sourceImages.join(", ")}" to "${destinationImages.join(", ")}" respectively`;
     if (username) {
@@ -216,16 +221,25 @@ async function run(): Promise<void> {
 
     // push the image
     for (let i = 0; i < destinationImages.length; i++) {
-        const args = [
-            ...(isImageFromDocker ? dockerPodmanOpts : []),
+        const args = [];
+        if (isImageFromDocker) {
+            args.push(...dockerPodmanOpts);
+        }
+        if (isManifest) {
+            args.push("manifest");
+        }
+        args.push(...[
             "push",
             "--quiet",
             "--digestfile",
             digestFile,
             isImageFromDocker ? getFullDockerImageName(sourceImages[i]) : sourceImages[i],
             destinationImages[i],
-        ];
-
+        ]);
+        // to push all the images referenced in the manifest
+        if (isManifest) {
+            args.push("--all");
+        }
         if (podmanExtraArgs.length > 0) {
             args.push(...podmanExtraArgs);
         }
@@ -392,6 +406,39 @@ async function removeDockerPodmanImageStroage(): Promise<void> {
     }
 }
 
+async function checkIfManifestsExists(): Promise<boolean> {
+    const foundManifests = [];
+    const missingManifests = [];
+    // check if manifest exist in Podman's storage
+    core.info(`🔍 Checking if the given image is manifest or not.`);
+    for (const manifest of sourceImages) {
+        const commandResult: ExecResult = await execute(
+            await getPodmanPath(),
+            [ "manifest", "exists", manifest ],
+            { ignoreReturnCode: true, group: true }
+        );
+        if (commandResult.exitCode === 0) {
+            foundManifests.push(manifest);
+        }
+        else {
+            missingManifests.push(manifest);
+        }
+    }
+
+    if (foundManifests.length > 0) {
+        core.info(`Image${foundManifests.length !== 1 ? "s" : ""} "${foundManifests.join(", ")}" `
+            + `${foundManifests.length !== 1 ? "are manifests" : "is a manifest"}.`);
+    }
+
+    if (foundManifests.length > 0 && missingManifests.length > 0) {
+        throw new Error(`Manifest${missingManifests.length !== 1 ? "s" : ""} "${missingManifests.join(", ")}" `
+            + `not found in the Podman image storage. Make sure that all the provided images are either `
+            + `manifests or container images.`);
+    }
+
+    return foundManifests.length === sourceImages.length;
+}
+
 async function execute(
     executable: string,
     args: string[],