Make squashing optional

action.yml

@@ -53,6 +53,10 @@ inputs:
     description: 'Set to true to build using the OCI image format instead of the Docker image format'
     default: 'false'
     required: false
+  squash:
+    description: 'Set to true to squash the image layers.'
+    default: 'true'
+    required: false
   arch:
     description:
       'Label the image with this ARCH, instead of defaulting to the host architecture'

src/buildah.ts

@@ -27,7 +27,7 @@ interface Buildah {
     from(baseImage: string, tlsVerify: boolean, extraArgs: string[]): Promise<CommandResult>;
     config(container: string, setting: BuildahConfigSettings): Promise<CommandResult>;
     copy(container: string, contentToCopy: string[]): Promise<CommandResult | undefined>;
-    commit(container: string, newImageName: string, useOCI: boolean): Promise<CommandResult>;
+    commit(container: string, newImageName: string, useOCI: boolean, squash: boolean): Promise<CommandResult>;
     manifestCreate(manifest: string): Promise<void>;
     manifestAdd(manifest: string, imageName: string, tags: string[]): Promise<void>;
 }
@@ -178,14 +178,15 @@ export class BuildahCli implements Buildah {
         return this.execute(args);
     }
 
-    async commit(container: string, newImageName: string, useOCI: boolean): Promise<CommandResult> {
+    async commit(container: string, newImageName: string, useOCI: boolean, squash: boolean): Promise<CommandResult> {
         core.debug("commit");
         core.debug(container);
         core.debug(newImageName);
-        const args: string[] = [
-            "commit", ...BuildahCli.getImageFormatOption(useOCI),
-            "--squash", container, newImageName,
-        ];
+        const args: string[] = [ "commit", ...BuildahCli.getImageFormatOption(useOCI) ];
+        if (squash) {
+            args.push("--squash");
+        }
+        args.push(container, newImageName);
         return this.execute(args);
     }
 

src/generated/inputs-outputs.ts

@@ -112,6 +112,12 @@ export enum Inputs {
      * Default: None.
      */
     PORT = "port",
+    /**
+     * Set to true to squash the image layers.
+     * Required: false
+     * Default: "true"
+     */
+    SQUASH = "squash",
     /**
      * The tags of the image to build. For multiple tags, seperate by whitespace. For example, "latest v1".
      * Required: false

src/index.ts

@@ -266,6 +266,7 @@ async function doBuildFromScratch(
     const workingDir = core.getInput(Inputs.WORKDIR);
     const envs = getInputList(Inputs.ENVS);
     const tlsVerify = core.getInput(Inputs.TLS_VERIFY) === "true";
+    const squash = core.getInput(Inputs.SQUASH) === "true";
 
     const container = await cli.from(baseImage, tlsVerify, extraArgs);
     const containerId = container.output.replace("\n", "");
@@ -287,7 +288,7 @@ async function doBuildFromScratch(
             };
             await cli.config(containerId, newImageConfig);
             await cli.copy(containerId, content);
-            await cli.commit(containerId, `${newImage}${tagSuffix}`, useOCI);
+            await cli.commit(containerId, `${newImage}${tagSuffix}`, useOCI, squash);
             builtImage.push(`${newImage}${tagSuffix}`);
         }
     }
@@ -301,7 +302,7 @@ async function doBuildFromScratch(
         };
         await cli.config(containerId, newImageConfig);
         await cli.copy(containerId, content);
-        await cli.commit(containerId, newImage, useOCI);
+        await cli.commit(containerId, newImage, useOCI, squash);
         builtImage.push(newImage);
     }