allow convert to take stdin (#1570)

Signed-off-by: Alex Goodman <alex.goodman@anchore.com>

cmd/syft/cli/convert.go

@@ -14,8 +14,9 @@ import (
 )
 
 const (
-	convertExample = `  {{.appName}} {{.command}} img.syft.json -o spdx-json                      convert a syft SBOM to spdx-json, output goes to stdout in table format, by default
-  {{.appName}} {{.command}} img.syft.json -o cyclonedx-json=img.cdx.json    convert a syft SBOM to CycloneDX, output goes to a file named img.cdx.json
+	convertExample = `  {{.appName}} {{.command}} img.syft.json -o spdx-json                      convert a syft SBOM to spdx-json, output goes to stdout
+  {{.appName}} {{.command}} img.syft.json -o cyclonedx-json=img.cdx.json    convert a syft SBOM to CycloneDX, output is written to the file "img.cdx.json""
+  {{.appName}} {{.command}} - -o spdx-json                                  convert an SBOM from STDIN to spdx-json
 `
 )
 

cmd/syft/cli/convert/convert.go

@@ -3,6 +3,7 @@ package convert
 import (
 	"context"
 	"fmt"
+	"io"
 	"os"
 
 	"github.com/anchore/syft/cmd/syft/cli/options"
@@ -26,15 +27,23 @@ func Run(_ context.Context, app *config.Application, args []string) error {
 
 	// this can only be a SBOM file
 	userInput := args[0]
-	f, err := os.Open(userInput)
-	if err != nil {
-		return fmt.Errorf("failed to open SBOM file: %w", err)
-	}
-	defer func() {
-		_ = f.Close()
-	}()
 
-	sbom, _, err := formats.Decode(f)
+	var reader io.ReadCloser
+
+	if userInput == "-" {
+		reader = os.Stdin
+	} else {
+		f, err := os.Open(userInput)
+		if err != nil {
+			return fmt.Errorf("failed to open SBOM file: %w", err)
+		}
+		defer func() {
+			_ = f.Close()
+		}()
+		reader = f
+	}
+
+	sbom, _, err := formats.Decode(reader)
 	if err != nil {
 		return fmt.Errorf("failed to decode SBOM: %w", err)
 	}

test/cli/all_formats_convertible_test.go

@@ -10,14 +10,9 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
-func TestConvertCmdFlags(t *testing.T) {
+func TestAllFormatsConvertable(t *testing.T) {
 	assertions := []traitAssertion{
-		func(tb testing.TB, stdout, _ string, _ int) {
-			tb.Helper()
-			if len(stdout) < 1000 {
-				tb.Errorf("there may not be any report output (len=%d)", len(stdout))
-			}
-		},
+		assertStdoutLengthGreaterThan(1000),
 		assertSuccessfulReturnCode,
 	}
 

test/cli/convert_cmd_test.go

@@ -0,0 +1,50 @@
+package cli
+
+import (
+	"fmt"
+	"strings"
+	"testing"
+)
+
+func TestConvertCmd(t *testing.T) {
+	assertions := []traitAssertion{
+		assertInOutput("PackageName: musl-utils"),
+		assertSuccessfulReturnCode,
+	}
+
+	tests := []struct {
+		from string
+		to   string
+	}{
+		{from: "syft-json", to: "spdx-tag-value"},
+	}
+
+	for _, test := range tests {
+		t.Run(fmt.Sprintf("from %s to %s", test.from, test.to), func(t *testing.T) {
+			sbomArgs := []string{"dir:./test-fixtures/image-pkg-coverage", "-o", test.from}
+			cmd, stdout, stderr := runSyft(t, nil, sbomArgs...)
+			if cmd.ProcessState.ExitCode() != 0 {
+				t.Log("STDOUT:\n", stdout)
+				t.Log("STDERR:\n", stderr)
+				t.Log("COMMAND:", strings.Join(cmd.Args, " "))
+				t.Fatalf("failure executing syft creating an sbom")
+				return
+			}
+
+			convertArgs := []string{"convert", "-", "-o", test.to}
+			cmd = getSyftCommand(t, convertArgs...)
+
+			cmd.Stdin = strings.NewReader(stdout)
+			stdout, stderr = runCommandObj(t, cmd, nil, false)
+
+			for _, traitFn := range assertions {
+				traitFn(t, stdout, stderr, cmd.ProcessState.ExitCode())
+			}
+			if t.Failed() {
+				t.Log("STDOUT:\n", stdout)
+				t.Log("STDERR:\n", stderr)
+				t.Log("COMMAND:", strings.Join(cmd.Args, " "))
+			}
+		})
+	}
+}

test/cli/utils_test.go

@@ -177,7 +177,7 @@ func runSyftCommand(t testing.TB, env map[string]string, expectError bool, args
 		t.Errorf("STDOUT: %s", stdout)
 		t.Errorf("STDERR: %s", stderr)
 
-		// this probably indicates a timeout
+		// this probably indicates a timeout... lets run it again with more verbosity to help debug issues
 		args = append(args, "-vv")
 		cmd = getSyftCommand(t, args...)
 
@@ -194,6 +194,48 @@ func runSyftCommand(t testing.TB, env map[string]string, expectError bool, args
 	return cmd, stdout, stderr
 }
 
+func runCommandObj(t testing.TB, cmd *exec.Cmd, env map[string]string, expectError bool) (string, string) {
+	cancel := make(chan bool, 1)
+	defer func() {
+		cancel <- true
+	}()
+
+	if env == nil {
+		env = make(map[string]string)
+	}
+
+	// we should not have tests reaching out for app update checks
+	env["SYFT_CHECK_FOR_APP_UPDATE"] = "false"
+
+	timeout := func() {
+		select {
+		case <-cancel:
+			return
+		case <-time.After(60 * time.Second):
+		}
+
+		if cmd != nil && cmd.Process != nil {
+			// get a stack trace printed
+			err := cmd.Process.Signal(syscall.SIGABRT)
+			if err != nil {
+				t.Errorf("error aborting: %+v", err)
+			}
+		}
+	}
+
+	go timeout()
+
+	stdout, stderr, err := runCommand(cmd, env)
+
+	if !expectError && err != nil && stdout == "" {
+		t.Errorf("error running syft: %+v", err)
+		t.Errorf("STDOUT: %s", stdout)
+		t.Errorf("STDERR: %s", stderr)
+	}
+
+	return stdout, stderr
+}
+
 func runCosign(t testing.TB, env map[string]string, args ...string) (*exec.Cmd, string, string) {
 	cmd := getCommand(t, ".tmp/cosign", args...)
 	if env == nil {