ISSUE-300 Fix init command when repos file not exist

.golangci.yml

@@ -22,7 +22,6 @@ linters:
     - godot
     - gofmt
     - goheader
-    - goimports
 #    - gomnd
     - gomodguard
     - goprintffuncname

.tool-versions

@@ -1,3 +1,3 @@
-golang 1.19.3
+golang 1.19.13
 helm 3.12.3
 golangci-lint 1.48.0

cmd/helm-s3/init.go

@@ -3,6 +3,7 @@ package main
 import (
 	"context"
 	"fmt"
+	"io/fs"
 
 	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
@@ -79,19 +80,8 @@ func (act *initAction) run(ctx context.Context) error {
 		return newSilentError()
 	}
 
-	repoEntry, ok, err := helmutil.LookupRepoEntryByURL(act.uri)
-	if err != nil {
-		return fmt.Errorf("lookup repo entry by url: %v", err)
-	}
-	if ok {
-		if act.ignoreIfExists {
-			return act.ignoreIfExistsError(repoEntry.Name())
-		}
-		if !act.force {
-			return act.alreadyExistsError(repoEntry.Name())
-		}
-
-		// fallthrough on --force
+	if err := act.checkRepoEntry(); err != nil {
+		return err
 	}
 
 	r, err := helmutil.NewIndex().Reader()
@@ -133,6 +123,35 @@ func (act *initAction) run(ctx context.Context) error {
 	return nil
 }
 
+func (act *initAction) checkRepoEntry() error {
+	repoEntry, ok, err := helmutil.LookupRepoEntryByURL(act.uri)
+	if errors.Is(err, fs.ErrNotExist) {
+		// Repo file may not exist, this is OK for instance when the helm is
+		// just installed (e.g. in docker).
+		return nil
+	}
+	if err != nil {
+		return fmt.Errorf("lookup repo entry by url: %v", err)
+	}
+
+	if !ok {
+		// Repo entry not found - all is good.
+		return nil
+	}
+
+	// Repo entry exists.
+
+	if act.ignoreIfExists {
+		return act.ignoreIfExistsError(repoEntry.Name())
+	}
+	if !act.force {
+		return act.alreadyExistsError(repoEntry.Name())
+	}
+
+	// fallthrough on --force
+	return nil
+}
+
 func (act *initAction) ignoreIfExistsError(name string) error {
 	act.printer.Printf(
 		"The repository with the provided URI already exists under name %q, ignore init operation.\n",

hack/test-e2e-local.sh

@@ -35,10 +35,10 @@ docker container run -d --rm --name "${DOCKER_NAME}" \
     -e MINIO_SECRET_KEY=$AWS_SECRET_ACCESS_KEY \
     minio/minio:latest server /data >/dev/null
 
-PATH=${GOPATH}/bin:${PATH}
+PATH=$(go env GOPATH)/bin:${PATH}
 if [ ! -x "$(which mc 2>/dev/null)" ]; then
     pushd /tmp > /dev/null
-    go get github.com/minio/mc
+    go install github.com/minio/mc@latest
     popd > /dev/null
 fi
 

internal/helmutil/helm_v2.go

@@ -13,7 +13,16 @@ import (
 // setupHelm2 sets up environment and function bindings for helm v2.
 func setupHelm2() {
 	helm2Home = resolveHome()
-	helm2LoadRepoFile = repo.LoadRepositoriesFile
+	helm2LoadRepoFile = func(path string) (*repo.RepoFile, error) {
+		// This is needed because LoadRepositoriesFile returns custom (not
+		// wrapped) error if the file does not exist.
+		_, err := os.Stat(path)
+		if err != nil {
+			return nil, err
+		}
+
+		return repo.LoadRepositoriesFile(path)
+	}
 }
 
 var (

internal/helmutil/repo_entry.go

@@ -25,6 +25,8 @@ type RepoEntry interface {
 }
 
 // LookupRepoEntry returns an entry from helm's repositories.yaml file by name.
+// If repositories.yaml file is not found, errors.Is(err, fs.ErrNotExist) will
+// return true.
 func LookupRepoEntry(name string) (RepoEntry, error) {
 	if IsHelm3() {
 		return lookupV3(name)
@@ -34,6 +36,8 @@ func LookupRepoEntry(name string) (RepoEntry, error) {
 
 // LookupRepoEntryByURL returns an entry from helm's repositories.yaml file by
 // repo URL. If not found, returns false and <nil> error.
+// If repositories.yaml file is not found, errors.Is(err, fs.ErrNotExist) will
+// return true.
 func LookupRepoEntryByURL(url string) (RepoEntry, bool, error) {
 	if IsHelm3() {
 		return lookupByURLV3(url)

internal/helmutil/repo_entry_test.go

@@ -1,6 +1,8 @@
 package helmutil
 
 import (
+	"io/fs"
+	"os"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -14,7 +16,7 @@ func TestLookupRepoEntry(t *testing.T) {
 		setup         func() func()
 		name          string
 		expectedEntry RepoEntry
-		expectError   bool
+		assertError   assert.ErrorAssertionFunc
 	}{
 		"helm v2": {
 			setup: func() func() {
@@ -41,7 +43,21 @@ func TestLookupRepoEntry(t *testing.T) {
 					URL:  "s3://my-charts",
 				},
 			},
-			expectError: false,
+			assertError: assert.NoError,
+		},
+		"helm v2 repo file not found": {
+			setup: func() func() {
+				helm2LoadRepoFile = func(path string) (file *repo2.RepoFile, e error) {
+					_, err := os.Stat("foobarbaz")
+					return nil, err
+				}
+				return mockEnv(t, "TILLER_HOST", "1")
+			},
+			name:          "my-charts",
+			expectedEntry: RepoEntryV2{},
+			assertError: func(t assert.TestingT, err error, i ...interface{}) bool {
+				return assert.ErrorIs(t, err, fs.ErrNotExist)
+			},
 		},
 		"helm v3": {
 			setup: func() func() {
@@ -72,7 +88,25 @@ func TestLookupRepoEntry(t *testing.T) {
 					URL:  "s3://my-charts",
 				},
 			},
-			expectError: false,
+			assertError: assert.NoError,
+		},
+		"helm v3 repo file not found": {
+			setup: func() func() {
+				helm3LoadRepoFile = func(path string) (file *repo3.File, e error) {
+					_, err := os.Stat("foobarbaz")
+					return nil, err
+				}
+				helm3Env = cli.New()
+				helm3Detected = func() bool {
+					return true
+				}
+				return func() {}
+			},
+			name:          "my-charts",
+			expectedEntry: RepoEntryV3{},
+			assertError: func(t assert.TestingT, err error, i ...interface{}) bool {
+				return assert.ErrorIs(t, err, fs.ErrNotExist)
+			},
 		},
 	}
 
@@ -83,7 +117,7 @@ func TestLookupRepoEntry(t *testing.T) {
 			defer teardown()
 
 			entry, err := LookupRepoEntry(tc.name)
-			assertError(t, err, tc.expectError)
+			tc.assertError(t, err)
 			assert.Equal(t, tc.expectedEntry, entry)
 		})
 	}

internal/helmutil/repo_entry_v2.go

@@ -37,7 +37,7 @@ func (r RepoEntryV2) CacheFile() string {
 func lookupV2(name string) (RepoEntryV2, error) {
 	repoFile, err := helm2LoadRepoFile(repoFilePathV2())
 	if err != nil {
-		return RepoEntryV2{}, errors.Wrap(err, "load repo file")
+		return RepoEntryV2{}, fmt.Errorf("load repo file: %w", err)
 	}
 
 	if entry, ok := repoFile.Get(name); ok {
@@ -50,7 +50,7 @@ func lookupV2(name string) (RepoEntryV2, error) {
 func lookupByURLV2(url string) (RepoEntryV2, bool, error) {
 	repoFile, err := helm2LoadRepoFile(repoFilePathV2())
 	if err != nil {
-		return RepoEntryV2{}, false, fmt.Errorf("load repo file: %v", err)
+		return RepoEntryV2{}, false, fmt.Errorf("load repo file: %w", err)
 	}
 
 	url = strings.TrimSuffix(url, "/")

internal/helmutil/repo_entry_v3.go

@@ -33,7 +33,7 @@ func (r RepoEntryV3) CacheFile() string {
 func lookupV3(name string) (RepoEntryV3, error) {
 	repoFile, err := helm3LoadRepoFile(repoFilePathV3())
 	if err != nil {
-		return RepoEntryV3{}, errors.Wrap(err, "load repo file")
+		return RepoEntryV3{}, fmt.Errorf("load repo file: %w", err)
 	}
 
 	entry := repoFile.Get(name)
@@ -47,7 +47,7 @@ func lookupV3(name string) (RepoEntryV3, error) {
 func lookupByURLV3(url string) (RepoEntryV3, bool, error) {
 	repoFile, err := helm3LoadRepoFile(repoFilePathV3())
 	if err != nil {
-		return RepoEntryV3{}, false, fmt.Errorf("load repo file: %v", err)
+		return RepoEntryV3{}, false, fmt.Errorf("load repo file: %w", err)
 	}
 
 	url = strings.TrimSuffix(url, "/")

internal/helmutil/testing_test.go

@@ -10,6 +10,7 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
+// TODO: replace with t.SetEnv.
 func mockEnv(t *testing.T, name, value string) func() {
 	old := os.Getenv(name)
 

tests/e2e/init_test.go

@@ -181,3 +181,29 @@ func TestInitForceAndIgnoreIfExists(t *testing.T) {
 	expectedStderr := "The --force and --ignore-if-exists flags are mutually exclusive and cannot be specified together."
 	assert.Contains(t, stderr.String(), expectedStderr)
 }
+
+func TestInitRepoFileNotFound(t *testing.T) {
+	t.Log("Test init action when repo file not found")
+
+	const (
+		repoName        = "test-init-repo-file-not-found"
+		repoDir         = "charts"
+		indexObjectName = repoDir + "/index.yaml"
+		uri             = "s3://" + repoName + "/" + repoDir
+	)
+
+	setupBucket(t, repoName)
+	defer teardownBucket(t, repoName)
+
+	// Run init.
+
+	t.Setenv("HELM_REPOSITORY_CONFIG", "testdata/file-not-exists.yaml")
+
+	cmd, stdout, stderr := command(fmt.Sprintf("helm s3 init %s", uri))
+	err := cmd.Run()
+	assert.NoError(t, err)
+	assertEmptyOutput(t, nil, stderr)
+	assert.Contains(t, stdout.String(), "Initialized empty repository at "+uri)
+
+	// Skip other checks because they are already covered by TestInit.
+}