Improve error messages for min-wrapper-count

- Specific message when no wrappers are found
- Better message when wrapper count is less than configured

Fixes #284

sources/src/actions/wrapper-validation/main.ts

@@ -18,15 +18,23 @@ export async function run(): Promise<void> {
 
         const result = await validate.findInvalidWrapperJars(
             path.resolve('.'),
-            +core.getInput('min-wrapper-count'),
             core.getInput('allow-snapshots') === 'true',
             core.getInput('allow-checksums').split(',')
         )
         if (result.isValid()) {
             core.info(result.toDisplayString())
+
+            const minWrapperCount = +core.getInput('min-wrapper-count')
+            if (result.valid.length < minWrapperCount) {
+                const message =
+                    result.valid.length === 0
+                        ? 'Wrapper validation failed: no Gradle Wrapper jars found. Did you forget to checkout the repository?'
+                        : `Wrapper validation failed: expected at least ${minWrapperCount} Gradle Wrapper jars, but found ${result.valid.length}.`
+                core.setFailed(message)
+            }
         } else {
             core.setFailed(
-                `Gradle Wrapper Validation Failed!\n  See https://github.com/gradle/actions/blob/main/docs/wrapper-validation.md#reporting-failures\n${result.toDisplayString()}`
+                `At least one Gradle Wrapper Jar failed validation!\n  See https://github.com/gradle/actions/blob/main/docs/wrapper-validation.md#validation-failures\n${result.toDisplayString()}`
             )
             if (result.invalid.length > 0) {
                 core.setOutput('failed-wrapper', `${result.invalid.map(w => w.path).join('|')}`)

sources/src/wrapper-validation/validate.ts

@@ -5,7 +5,6 @@ import {resolve} from 'path'
 
 export async function findInvalidWrapperJars(
     gitRepoRoot: string,
-    minWrapperCount: number,
     allowSnapshots: boolean,
     allowedChecksums: string[],
     previouslyValidatedChecksums: string[] = [],
@@ -13,11 +12,6 @@ export async function findInvalidWrapperJars(
 ): Promise<ValidationResult> {
     const wrapperJars = await find.findWrapperJars(gitRepoRoot)
     const result = new ValidationResult([], [])
-    if (wrapperJars.length < minWrapperCount) {
-        result.errors.push(
-            `Expected to find at least ${minWrapperCount} Gradle Wrapper JARs but got only ${wrapperJars.length}`
-        )
-    }
     if (wrapperJars.length > 0) {
         const notYetValidatedWrappers = []
         for (const wrapperJar of wrapperJars) {
@@ -54,7 +48,6 @@ export class ValidationResult {
     valid: WrapperJar[]
     invalid: WrapperJar[]
     fetchedChecksums = false
-    errors: string[] = []
 
     constructor(valid: WrapperJar[], invalid: WrapperJar[]) {
         this.valid = valid
@@ -62,7 +55,7 @@ export class ValidationResult {
     }
 
     isValid(): boolean {
-        return this.invalid.length === 0 && this.errors.length === 0
+        return this.invalid.length === 0
     }
 
     toDisplayString(): string {
@@ -72,10 +65,6 @@ export class ValidationResult {
                 this.invalid
             )}`
         }
-        if (this.errors.length > 0) {
-            if (displayString.length > 0) displayString += '\n'
-            displayString += `✗ Other validation errors:\n  ${this.errors.join(`\n  `)}`
-        }
         if (this.valid.length > 0) {
             if (displayString.length > 0) displayString += '\n'
             displayString += `✓ Found known Gradle Wrapper JAR files:\n${ValidationResult.toDisplayList(this.valid)}`

sources/src/wrapper-validation/wrapper-validator.ts

@@ -20,20 +20,19 @@ export async function validateWrappers(
 
     const result = await findInvalidWrapperJars(
         workspaceRoot,
-        0,
         config.allowSnapshotWrappers(),
         allowedChecksums,
         previouslyValidatedChecksums
     )
     if (result.isValid()) {
         await core.group('All Gradle Wrapper jars are valid', async () => {
-            core.info(`Loaded previously validated checksums from cache: ${previouslyValidatedChecksums.join(', ')}`)
+            core.debug(`Loaded previously validated checksums from cache: ${previouslyValidatedChecksums.join(', ')}`)
             core.info(result.toDisplayString())
         })
     } else {
         core.info(result.toDisplayString())
         throw new JobFailure(
-            `Gradle Wrapper Validation Failed!\n  See https://github.com/gradle/actions/blob/main/docs/wrapper-validation.md#validation-failures\n${result.toDisplayString()}`
+            `At least one Gradle Wrapper Jar failed validation!\n  See https://github.com/gradle/actions/blob/main/docs/wrapper-validation.md#validation-failures\n${result.toDisplayString()}`
         )
     }