Run func without HOME defined/ unaccessible .config dir

cmd/build.go

@@ -159,9 +159,6 @@ func runBuild(cmd *cobra.Command, _ []string, newClient ClientFactory) (err erro
 		cfg buildConfig
 		f   fn.Function
 	)
-	if err = config.CreatePaths(); err != nil { // for possible auth.json usage
-		return
-	}
 	if cfg, err = newBuildConfig().Prompt(); err != nil { // gather values into a single instruction set
 		return
 	}

cmd/deploy.go

@@ -233,9 +233,6 @@ func runDeploy(cmd *cobra.Command, newClient ClientFactory) (err error) {
 		cfg deployConfig
 		f   fn.Function
 	)
-	if err = config.CreatePaths(); err != nil { // for possible auth.json usage
-		return
-	}
 	if cfg, err = newDeployConfig(cmd).Prompt(); err != nil {
 		return
 	}

cmd/deploy_test.go

@@ -1894,3 +1894,36 @@ func TestDeploy_NoErrorOnOldFunctionNotFound(t *testing.T) {
 		t.Fatal(err)
 	}
 }
+
+// TestDeploy_WithoutHome ensures that deploying a function without HOME &
+// XDG_CONFIG_HOME defined succeeds
+func TestDeploy_WithoutHome(t *testing.T) {
+	var (
+		root = FromTempDirectory(t)
+		ns   = "myns"
+	)
+
+	t.Setenv("HOME", "")
+	t.Setenv("XDG_CONFIG_HOME", "")
+
+	// Create a basic go Function
+	f := fn.Function{
+		Runtime: "go",
+		Root:    root,
+	}
+	_, err := fn.New().Init(f)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Deploy the function
+	cmd := NewDeployCmd(NewTestClient(
+		fn.WithDeployer(mock.NewDeployer()),
+		fn.WithRegistry(TestRegistry)))
+
+	cmd.SetArgs([]string{fmt.Sprintf("--namespace=%s", ns)})
+	err = cmd.Execute()
+	if err != nil {
+		t.Fatal(err)
+	}
+}

pkg/builders/buildpacks/builder.go

@@ -211,7 +211,7 @@ func (b *Builder) Build(ctx context.Context, f fn.Function, platforms []fn.Platf
 	if err = impl.Build(ctx, opts); err != nil {
 		if ctx.Err() != nil {
 			return // SIGINT
-		} else if !b.verbose {
+		} else if b.verbose {
 			err = fmt.Errorf("failed to build the function: %w", err)
 			fmt.Fprintln(color.Stderr(), "")
 			_, _ = io.Copy(color.Stderr(), &b.outBuff)

pkg/docker/creds/credentials.go

@@ -165,24 +165,31 @@ func NewCredentialsProvider(configPath string, opts ...Opt) docker.CredentialsPr
 		}
 	}
 
+	// default credential loaders map -- load only those that should be there.
+	var defaultCredentialLoaders = []CredentialsCallback{}
+
 	c.authFilePath = filepath.Join(configPath, "auth.json")
 	sys := &containersTypes.SystemContext{
 		AuthFilePath: c.authFilePath,
 	}
 
-	home, err := os.UserHomeDir()
-	if err != nil {
-		panic(err)
+	if _, err := os.Stat(c.authFilePath); err == nil {
+		defaultCredentialLoaders = append(defaultCredentialLoaders,
+			func(registry string) (docker.Credentials, error) {
+				return getCredentialsByCredentialHelper(c.authFilePath, registry)
+			})
 	}
-	dockerConfigPath := filepath.Join(home, ".docker", "config.json")
 
-	var defaultCredentialLoaders = []CredentialsCallback{
-		func(registry string) (docker.Credentials, error) {
-			return getCredentialsByCredentialHelper(c.authFilePath, registry)
-		},
-		func(registry string) (docker.Credentials, error) {
-			return getCredentialsByCredentialHelper(dockerConfigPath, registry)
-		},
+	// add only if home dir is defined -- for .docker/config.json creds
+	home, err := os.UserHomeDir()
+	if err == nil {
+		dockerConfigPath := filepath.Join(home, ".docker", "config.json")
+		defaultCredentialLoaders = append(defaultCredentialLoaders,
+			func(registry string) (docker.Credentials, error) {
+				return getCredentialsByCredentialHelper(dockerConfigPath, registry)
+			})
+	}
+	defaultCredentialLoaders = append(defaultCredentialLoaders,
 		func(registry string) (docker.Credentials, error) {
 			creds, err := dockerConfig.GetCredentials(sys, registry)
 			if err != nil {
@@ -195,7 +202,8 @@ func NewCredentialsProvider(configPath string, opts ...Opt) docker.CredentialsPr
 				Username: creds.Username,
 				Password: creds.Password,
 			}, nil
-		},
+		})
+	defaultCredentialLoaders = append(defaultCredentialLoaders,
 		func(registry string) (docker.Credentials, error) {
 			// Fallback onto default docker config locations
 			emptySys := &containersTypes.SystemContext{}
@@ -207,11 +215,11 @@ func NewCredentialsProvider(configPath string, opts ...Opt) docker.CredentialsPr
 				Username: creds.Username,
 				Password: creds.Password,
 			}, nil
-		},
+		})
+	defaultCredentialLoaders = append(defaultCredentialLoaders,
 		func(registry string) (docker.Credentials, error) { // empty credentials provider for unsecured registries
 			return docker.Credentials{}, nil
-		},
-	}
+		})
 
 	c.credentialLoaders = append(c.credentialLoaders, defaultCredentialLoaders...)
 

pkg/docker/creds/credentials_test.go

@@ -20,6 +20,7 @@ import (
 	"net/http"
 	"os"
 	"path/filepath"
+	"reflect"
 	"runtime"
 	"strings"
 	"sync"
@@ -284,7 +285,6 @@ func startServer(t *testing.T, uname, pwd string) (addr, addrTLS string) {
 			panic(err)
 		}
 	}()
-
 	// make the testing CA trusted by default HTTP transport/client
 	oldDefaultTransport := http.DefaultTransport
 	newDefaultTransport := http.DefaultTransport.(*http.Transport).Clone()
@@ -549,6 +549,77 @@ func TestCredentialsProviderSavingFromUserInput(t *testing.T) {
 	}
 }
 
+// TestCredentialsWithoutHome tests different scenarios when HOME is not set
+func TestCredentialsWithoutHome(t *testing.T) {
+	type args struct {
+		promptUser        creds.CredentialsCallback
+		verifyCredentials creds.VerifyCredentialsCallback
+		registry          string
+		setUpEnv          setUpEnv
+	}
+	tests := []struct {
+		name              string
+		testHomePathEmpty bool
+		args              args
+		want              Credentials
+	}{
+		{
+			name:              "empty home with correct user prompt",
+			testHomePathEmpty: true,
+			args: args{
+				promptUser:        correctPwdCallback, // user inputs correct credentials
+				verifyCredentials: correctVerifyCbk,
+				registry:          "docker.io",
+				setUpEnv:          setEmptyHome,
+			},
+			want: Credentials{Username: dockerIoUser, Password: dockerIoUserPwd},
+		},
+		{
+			name: "empty config with user prompt",
+			args: args{
+				promptUser:        correctPwdCallback,
+				verifyCredentials: correctVerifyCbk,
+				registry:          "docker.io",
+			},
+			want: Credentials{Username: dockerIoUser, Password: dockerIoUserPwd},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			resetHomeDir(t)
+			if tt.args.setUpEnv != nil {
+				tt.args.setUpEnv(t)
+			}
+
+			// prepare config path for credentials provider
+			var configPath string
+			if tt.testHomePathEmpty {
+				configPath = ""
+			} else {
+				configPath = testConfigPath(t)
+			}
+
+			credentialsProvider := creds.NewCredentialsProvider(
+				configPath,
+				creds.WithPromptForCredentials(tt.args.promptUser),
+				creds.WithVerifyCredentials(tt.args.verifyCredentials),
+			)
+
+			got, err := credentialsProvider(context.Background(), tt.args.registry+"/someorg/someimage:sometag")
+			if err != nil {
+				t.Errorf("unexpected error: %v", err)
+				return
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("got: %v, want: %v", got, tt.want)
+			}
+		})
+	}
+}
+
+// ********************** helper functions below **************************** \\
+
 func resetHomeDir(t *testing.T) {
 	t.TempDir()
 	if err := os.RemoveAll(homeTempDir); err != nil {
@@ -903,3 +974,10 @@ func (i *inMemoryHelper) Delete(serverURL string) error {
 
 	return credentials.NewErrCredentialsNotFound()
 }
+
+// set home variables to empty values
+func setEmptyHome(t *testing.T) {
+	t.Helper()
+	t.Setenv("HOME", "")
+	t.Setenv("XDG_CONFIG_HOME", "")
+}

pkg/functions/client_int_test.go

@@ -19,6 +19,7 @@ import (
 	"github.com/docker/docker/client"
 
 	"knative.dev/func/pkg/builders/buildpacks"
+	"knative.dev/func/pkg/builders/s2i"
 	"knative.dev/func/pkg/docker"
 	fn "knative.dev/func/pkg/functions"
 	"knative.dev/func/pkg/knative"
@@ -545,6 +546,31 @@ func Handle(ctx context.Context, w http.ResponseWriter, req *http.Request) {
 	}
 }
 
+// TestDeployWithoutHome ensures that running client.New works without
+// home
+func TestDeployWithoutHome(t *testing.T) {
+	root, cleanup := Mktemp(t)
+	defer cleanup()
+
+	t.Setenv("HOME", "")
+	t.Setenv("XDG_CONFIG_HOME", "")
+	verbose := false
+	name := "test-deploy-no-home"
+
+	f := fn.Function{Runtime: "node", Name: name, Root: root, Namespace: DefaultNamespace}
+
+	// client with s2i builder because pack needs HOME
+	client := newClientWithS2i(verbose)
+
+	// expect to succeed
+	_, _, err := client.New(context.Background(), f)
+	if err != nil {
+		t.Fatalf("expected no errors but got %v", err)
+	}
+
+	defer del(t, client, name, DefaultNamespace)
+}
+
 // ***********
 //   Helpers
 // ***********
@@ -571,6 +597,27 @@ func newClient(verbose bool) *fn.Client {
 	)
 }
 
+// copy of newClient just builder is s2i instead of buildpacks
+func newClientWithS2i(verbose bool) *fn.Client {
+	builder := s2i.NewBuilder(s2i.WithVerbose(verbose))
+	pusher := docker.NewPusher(docker.WithVerbose(verbose))
+	deployer := knative.NewDeployer(knative.WithDeployerVerbose(verbose))
+	describer := knative.NewDescriber(verbose)
+	remover := knative.NewRemover(verbose)
+	lister := knative.NewLister(verbose)
+
+	return fn.New(
+		fn.WithRegistry(DefaultRegistry),
+		fn.WithVerbose(verbose),
+		fn.WithBuilder(builder),
+		fn.WithPusher(pusher),
+		fn.WithDeployer(deployer),
+		fn.WithDescriber(describer),
+		fn.WithRemover(remover),
+		fn.WithLister(lister),
+	)
+}
+
 // Del cleans up after a test by removing a function by name.
 // (test fails if the named function does not exist)
 //