call input to set method for evaluating build

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

src/context.ts

@@ -11,11 +11,12 @@ import {Util} from '@docker/actions-toolkit/lib/util';
 import {BakeDefinition} from '@docker/actions-toolkit/lib/types/buildx/bake';
 
 export interface Inputs {
-  allow: string[];
   builder: string;
-  files: string[];
   workdir: string;
-  targets: string[];
+  source: string;
+  allow: string[];
+  call: string;
+  files: string[];
   'no-cache': boolean;
   pull: boolean;
   load: boolean;
@@ -23,17 +24,18 @@ export interface Inputs {
   push: boolean;
   sbom: string;
   set: string[];
-  source: string;
+  targets: string[];
   'github-token': string;
 }
 
 export async function getInputs(): Promise<Inputs> {
   return {
-    allow: Util.getInputList('allow'),
     builder: core.getInput('builder'),
-    files: Util.getInputList('files'),
     workdir: core.getInput('workdir') || '.',
-    targets: Util.getInputList('targets'),
+    source: getSourceInput('source'),
+    allow: Util.getInputList('allow'),
+    call: core.getInput('call'),
+    files: Util.getInputList('files'),
     'no-cache': core.getBooleanInput('no-cache'),
     pull: core.getBooleanInput('pull'),
     load: core.getBooleanInput('load'),
@@ -41,7 +43,7 @@ export async function getInputs(): Promise<Inputs> {
     push: core.getBooleanInput('push'),
     sbom: core.getInput('sbom'),
     set: Util.getInputList('set', {ignoreComma: true, quote: false}),
-    source: getSourceInput('source'),
+    targets: Util.getInputList('targets'),
     'github-token': core.getInput('github-token')
   };
 }
@@ -69,6 +71,12 @@ async function getBakeArgs(inputs: Inputs, definition: BakeDefinition, toolkit:
       args.push('--allow', allow);
     });
   }
+  if (inputs.call) {
+    if (!(await toolkit.buildx.versionSatisfies('>=0.16.0'))) {
+      throw new Error(`Buildx >= 0.16.0 is required to use the call flag.`);
+    }
+    args.push('--call', inputs.call);
+  }
   await Util.asyncForEach(inputs.files, async file => {
     args.push('--file', file);
   });

src/main.ts

@@ -146,8 +146,26 @@ actionsToolkit.run(
       env: buildEnv,
       ignoreReturnCode: true
     }).then(res => {
-      if (res.stderr.length > 0 && res.exitCode != 0) {
-        err = Error(`buildx bake failed with: ${res.stderr.match(/(.*)\s*$/)?.[0]?.trim() ?? 'unknown error'}`);
+      if (res.exitCode != 0) {
+        if (inputs.call && inputs.call === 'check' && res.stdout.length > 0) {
+          // checks warnings are printed to stdout: https://github.com/docker/buildx/pull/2647
+          // with bake we can have multiple targets being checked so we need to
+          // count the total number of warnings
+          const totalWarnings = [...res.stdout.matchAll(/^Check complete, (\d+) warnings? (?:has|have) been found!/gm)].reduce((sum, m) => sum + parseInt(m[1], 10), 0);
+          if (totalWarnings > 0) {
+            // https://github.com/docker/buildx/blob/1e50e8ddabe108f009b9925e13a321d7c8f99f26/commands/build.go#L797-L803
+            if (totalWarnings === 1) {
+              err = Error(`Check complete, ${totalWarnings} warning has been found!`);
+            } else {
+              err = Error(`Check complete, ${totalWarnings} warnings have been found!`);
+            }
+          } else {
+            // if there are no warnings found, return the first line of stdout
+            err = Error(res.stdout.split('\n')[0]?.trim());
+          }
+        } else if (res.stderr.length > 0) {
+          err = Error(`buildx bake failed with: ${res.stderr.match(/(.*)\s*$/)?.[0]?.trim() ?? 'unknown error'}`);
+        }
       }
     });
 
@@ -191,6 +209,8 @@ actionsToolkit.run(
     await core.group(`Check build summary support`, async () => {
       if (!buildSummaryEnabled()) {
         core.info('Build summary disabled');
+      } else if (inputs.call && inputs.call !== 'build') {
+        core.info(`Build summary skipped for ${inputs.call} subrequest`);
       } else if (GitHub.isGHES) {
         core.info('Build summary is not yet supported on GHES');
       } else if (!(await toolkit.buildx.versionSatisfies('>=0.13.0'))) {