Add --sign-by-sq-fingerprint

.cirrus.yml

@@ -21,8 +21,14 @@
     SCRIPT_BASE: "./contrib/cirrus"
 
     # Google-cloud VM Images
-    IMAGE_SUFFIX: "c20250721t181111z-f42f41d13"
+    # If you are updating IMAGE_SUFFIX: We are currently using rawhide for
+    # the containers_image_sequoia tests because the rust-podman-sequoia
+    # package is not available in earlier releases; once we update to a future
+    # Fedora release (or if the package is backported), switch back from Rawhide
+    # to the latest Fedora release.
+    IMAGE_SUFFIX: "c20250910t092246z-f42f41d13"
     FEDORA_CACHE_IMAGE_NAME: "fedora-${IMAGE_SUFFIX}"
+    RAWHIDE_CACHE_IMAGE_NAME: "rawhide-${IMAGE_SUFFIX}"
 
     # Container FQIN's
     FEDORA_CONTAINER_FQIN: "quay.io/libpod/fedora_podman:${IMAGE_SUFFIX}"
@@ -71,7 +77,7 @@
       "${SKOPEO_PATH}/${SCRIPT_BASE}/runner.sh" build
       "${SKOPEO_PATH}/${SCRIPT_BASE}/runner.sh" doccheck
 
 osx_task:
     # Don't run for docs-only builds.
     # Also don't run on release-branches or their PRs,
     # since base container-image is not version-constrained.
@@ -110,7 +116,7 @@
         task_cleanup_script: *mac_cleanup
 
 
 cross_task:
     alias: cross
     only_if: >-
         $CIRRUS_CHANGE_TITLE !=~ '.*CI:DOCS.*'
@@ -133,7 +139,7 @@
         "${GOSRC}/${SCRIPT_BASE}/runner.sh" cross
 
 
 ostree-rs-ext_task:
     alias: proxy_ostree_ext
     only_if: *not_docs_or_release_branch
     # WARNING: This task potentially performs a container image
@@ -174,7 +180,7 @@
 ##### repository's `.cirrus.yml`.  Changes made here should be fully merged
 ##### prior to being manually duplicated and maintained in containers/image.
 #####
 test_skopeo_task:
     alias: test_skopeo
     # Don't test for [CI:DOCS], [CI:BUILD].
     only_if: >-
@@ -190,14 +196,21 @@
         # Required to be 200gig, do not modify - has i/o performance impact
         # according to gcloud CLI tool warning messages.
         disk: 200
-        image_name: ${FEDORA_CACHE_IMAGE_NAME}
+        image_name: ${VM_IMAGE_NAME}
     matrix:
         - name: "Skopeo Test"  # N/B: Name ref. by hack/get_fqin.sh
           env:
               BUILDTAGS: ''
+              VM_IMAGE_NAME: ${FEDORA_CACHE_IMAGE_NAME}
         - name: "Skopeo Test w/ opengpg"
           env:
               BUILDTAGS: *withopengpg
+              VM_IMAGE_NAME: ${FEDORA_CACHE_IMAGE_NAME}
+        - name: "Skopeo test w/ Sequoia (currently Rawhide)"
+          env:
+              BUILDTAGS: 'containers_image_sequoia'
+              # If you are removing the use of rawhide, also remove the VM_IMAGE_NAME condition from runner.sh .
+              VM_IMAGE_NAME: ${RAWHIDE_CACHE_IMAGE_NAME}
     setup_script: >-
         "${GOSRC}/${SCRIPT_BASE}/runner.sh" setup
     vendor_script: >-
@@ -226,6 +239,7 @@
         # Space-separated list of images used by this repository state
         IMGNAMES: |
             ${FEDORA_CACHE_IMAGE_NAME}
+            ${RAWHIDE_CACHE_IMAGE_NAME}
             build-push-${IMAGE_SUFFIX}
         BUILDID: "${CIRRUS_BUILD_ID}"
         REPOREF: "${CIRRUS_REPO_NAME}"
@@ -239,7 +253,7 @@
 # Status aggregator for all tests.  This task simply ensures a defined
 # set of tasks all passed, and allows confirming that based on the status
 # of this task.
 success_task:
     name: "Total Success"
     alias: success
     # N/B: ALL tasks must be listed here, minus their '_task' suffix.

Makefile

@@ -24,6 +24,8 @@ GOBIN := $(shell $(GO) env GOBIN)
 GOOS ?= $(shell go env GOOS)
 GOARCH ?= $(shell go env GOARCH)
 
+SEQUOIA_SONAME_DIR =
+
 # N/B: This value is managed by Renovate, manual changes are
 # possible, as long as they don't disturb the formatting
 # (i.e. DO NOT ADD A 'v' prefix!)
@@ -82,7 +84,7 @@ CONTAINER_GOSRC = /src/github.com/containers/skopeo
 CONTAINER_RUN ?= $(CONTAINER_CMD) --security-opt label=disable -v $(CURDIR):$(CONTAINER_GOSRC) -w $(CONTAINER_GOSRC) $(SKOPEO_CIDEV_CONTAINER_FQIN)
 
 EXTRA_LDFLAGS ?=
-SKOPEO_LDFLAGS := -ldflags '$(EXTRA_LDFLAGS)'
+SKOPEO_LDFLAGS := -ldflags '-X go.podman.io/image/v5/signature/internal/sequoia.sequoiaLibraryDir=$(SEQUOIA_SONAME_DIR) $(EXTRA_LDFLAGS)'
 
 MANPAGES_MD = $(wildcard docs/*.md)
 MANPAGES ?= $(MANPAGES_MD:%.md=%)
@@ -251,7 +253,7 @@ validate-docs: bin/skopeo
 	hack/xref-helpmsgs-manpages
 
 test-unit-local:
-	$(GO) test -tags "$(BUILDTAGS)" $$($(GO) list -tags "$(BUILDTAGS)" -e ./... | grep -v '^github\.com/containers/skopeo/\(integration\|vendor/.*\)$$')
+	$(GO) test $(SKOPEO_LDFLAGS) -tags "$(BUILDTAGS)" $$($(GO) list -tags "$(BUILDTAGS)" -e ./... | grep -v '^github\.com/containers/skopeo/\(integration\|vendor/.*\)$$')
 
 vendor:
 	$(GO) mod tidy

cmd/skopeo/signing_test.go

@@ -29,7 +29,8 @@ func assertTestFailed(t *testing.T, stdout string, err error, substring string)
 }
 
 func TestStandaloneSign(t *testing.T) {
-	mech, _, err := signature.NewEphemeralGPGSigningMechanism([]byte{})
+	t.Setenv("GNUPGHOME", "fixtures")
+	mech, err := signature.NewGPGSigningMechanism()
 	require.NoError(t, err)
 	defer mech.Close()
 	if err := mech.SupportsSigning(); err != nil {
@@ -38,7 +39,6 @@ func TestStandaloneSign(t *testing.T) {
 
 	manifestPath := "fixtures/image.manifest.json"
 	dockerReference := "testing/manifest"
-	t.Setenv("GNUPGHOME", "fixtures")
 
 	// Invalid command-line arguments
 	for _, args := range [][]string{
@@ -87,9 +87,6 @@ func TestStandaloneSign(t *testing.T) {
 	require.NoError(t, err)
 	manifest, err := os.ReadFile(manifestPath)
 	require.NoError(t, err)
-	mech, err = signature.NewGPGSigningMechanism()
-	require.NoError(t, err)
-	defer mech.Close()
 	verified, err := signature.VerifyDockerManifestSignature(sig, manifest, dockerReference, mech, fixturesTestKeyFingerprint)
 	require.NoError(t, err)
 	assert.Equal(t, dockerReference, verified.DockerReference)

cmd/skopeo/utils.go

@@ -26,6 +26,7 @@ import (
 	"go.podman.io/image/v5/pkg/cli/sigstore"
 	"go.podman.io/image/v5/pkg/compression"
 	"go.podman.io/image/v5/signature/signer"
+	"go.podman.io/image/v5/signature/simplesequoia"
 	"go.podman.io/image/v5/storage"
 	"go.podman.io/image/v5/transports/alltransports"
 	"go.podman.io/image/v5/types"
@@ -329,6 +330,7 @@ func (opts *imageDestOptions) warnAboutIneffectiveOptions(destTransport types.Im
 type sharedCopyOptions struct {
 	removeSignatures         bool                      // Do not copy signatures from the source image
 	signByFingerprint        string                    // Sign the image using a GPG key with the specified fingerprint
+	signBySequoiaFingerprint string                    // Sign the image using a Sequoia-PGP key with the specified fingerprint
 	signBySigstoreParamFile  string                    // Sign the image using a sigstore signature per configuration in a param file
 	signBySigstorePrivateKey string                    // Sign the image using a sigstore private key
 	signPassphraseFile       string                    // Path pointing to a passphrase file when signing
@@ -342,6 +344,7 @@ func sharedCopyFlags() (pflag.FlagSet, *sharedCopyOptions) {
 	fs := pflag.FlagSet{}
 	fs.BoolVar(&opts.removeSignatures, "remove-signatures", false, "Do not copy signatures from source")
 	fs.StringVar(&opts.signByFingerprint, "sign-by", "", "Sign the image using a GPG key with the specified `FINGERPRINT`")
+	fs.StringVar(&opts.signBySequoiaFingerprint, "sign-by-sq-fingerprint", "", "Sign the image using a Sequoia-PGP key with the specified `FINGERPRINT`")
 	fs.StringVar(&opts.signBySigstoreParamFile, "sign-by-sigstore", "", "Sign the image using a sigstore parameter file at `PATH`")
 	fs.StringVar(&opts.signBySigstorePrivateKey, "sign-by-sigstore-private-key", "", "Sign the image using a sigstore private key at `PATH`")
 	fs.StringVar(&opts.signPassphraseFile, "sign-passphrase-file", "", "Read a passphrase for signing an image from `PATH`")
@@ -365,8 +368,20 @@ func (opts *sharedCopyOptions) copyOptions(stdout io.Writer) (*copy.Options, fun
 	// c/image/copy.Image does allow creating both simple signing and sigstore signatures simultaneously,
 	// with independent passphrases, but that would make the CLI probably too confusing.
 	// For now, use the passphrase with either, but only one of them.
-	if opts.signPassphraseFile != "" && opts.signByFingerprint != "" && opts.signBySigstorePrivateKey != "" {
-		return nil, nil, fmt.Errorf("Only one of --sign-by and sign-by-sigstore-private-key can be used with sign-passphrase-file")
+	if opts.signPassphraseFile != "" {
+		count := 0
+		if opts.signByFingerprint != "" {
+			count++
+		}
+		if opts.signBySequoiaFingerprint != "" {
+			count++
+		}
+		if opts.signBySigstorePrivateKey != "" {
+			count++
+		}
+		if count > 1 {
+			return nil, nil, fmt.Errorf("Only one of --sign-by, --sign-by-sq-fingerprint and --sign-by-sigstore-private-key can be used with --sign-passphrase-file")
+		}
 	}
 	var passphrase string
 	if opts.signPassphraseFile != "" {
@@ -382,6 +397,7 @@ func (opts *sharedCopyOptions) copyOptions(stdout io.Writer) (*copy.Options, fun
 		}
 		passphrase = p
 	} // opts.signByFingerprint triggers a GPG-agent passphrase prompt, possibly using a more secure channel, so we usually shouldn’t prompt ourselves if no passphrase was explicitly provided.
+	// With opts.signBySequoiaFingerprint, we don’t prompt for a passphrase (for now??): We don’t know whether the key requires a passphrase.
 	var passphraseBytes []byte
 	if passphrase != "" {
 		passphraseBytes = []byte(passphrase)
@@ -412,6 +428,19 @@ func (opts *sharedCopyOptions) copyOptions(stdout io.Writer) (*copy.Options, fun
 		}
 		signers = append(signers, signer)
 	}
+	if opts.signBySequoiaFingerprint != "" {
+		sqOpts := []simplesequoia.Option{
+			simplesequoia.WithKeyFingerprint(opts.signBySequoiaFingerprint),
+		}
+		if passphrase != "" {
+			sqOpts = append(sqOpts, simplesequoia.WithPassphrase(passphrase))
+		}
+		signer, err := simplesequoia.NewSigner(sqOpts...)
+		if err != nil {
+			return nil, nil, fmt.Errorf("Error using --sign-by-sq-fingerprint: %w", err)
+		}
+		signers = append(signers, signer)
+	}
 
 	succeeded = true
 	return &copy.Options{

cmd/skopeo/utils_nosequoia_test.go

@@ -0,0 +1,5 @@
+//go:build !containers_image_sequoia
+
+package main
+
+const buildWithSequoia = false

cmd/skopeo/utils_sequoia_test.go

@@ -0,0 +1,5 @@
+//go:build containers_image_sequoia
+
+package main
+
+const buildWithSequoia = true

cmd/skopeo/utils_test.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"errors"
 	"os"
+	"slices"
 	"testing"
 
 	imgspecv1 "github.com/opencontainers/image-spec/specs-go/v1"
@@ -378,6 +379,7 @@ func TestSharedCopyOptionsCopyOptions(t *testing.T) {
 	// Set most flags to non-default values
 	// This should also test --sign-by-sigstore and --sign-by-sigstore-private-key; we would have
 	// to create test keys for that.
+	// This does not test --sign-by-sq-fingerprint, because that needs to be conditional based on buildWithSequoia.
 	opts = fakeSharedCopyOptions(t, []string{
 		"--remove-signatures",
 		"--sign-by", "gpgFingerprint",
@@ -395,12 +397,13 @@ func TestSharedCopyOptionsCopyOptions(t *testing.T) {
 		ForceManifestMIMEType: imgspecv1.MediaTypeImageManifest,
 	}, res)
 
-	// --sign-passphrase-file + --sign-by work
+	// --sign-passphrase-file:
 	passphraseFile, err := os.CreateTemp("", "passphrase") // Eventually we could refer to a passphrase fixture instead
 	require.NoError(t, err)
 	defer os.Remove(passphraseFile.Name())
 	_, err = passphraseFile.WriteString("test-passphrase")
 	require.NoError(t, err)
+	// --sign-passphrase-file + --sign-by work
 	opts = fakeSharedCopyOptions(t, []string{
 		"--sign-by", "gpgFingerprint",
 		"--sign-passphrase-file", passphraseFile.Name(),
@@ -414,14 +417,42 @@ func TestSharedCopyOptionsCopyOptions(t *testing.T) {
 		SignSigstorePrivateKeyPassphrase: []byte("test-passphrase"),
 		ReportWriter:                     &someStdout,
 	}, res)
-	// --sign-passphrase-file + --sign-by-sigstore-private-key should be tested here.
+	// If Sequoia is supported, --sign-passphrase-file + --sign-by-sq-fingerprint work
+	if buildWithSequoia {
+		opts = fakeSharedCopyOptions(t, []string{
+			"--sign-by-sq-fingerprint", "sqFingerprint",
+			"--sign-passphrase-file", passphraseFile.Name(),
+		})
+		res, cleanup, err = opts.copyOptions(&someStdout)
+		require.NoError(t, err)
+		defer cleanup()
+		assert.NotNil(t, res.Signers) // Contains a Sequoia signer
+		res.Signers = nil             // To allow the comparison below
+		assert.Equal(t, &copy.Options{
+			SignPassphrase:                   "test-passphrase",
+			SignSigstorePrivateKeyPassphrase: []byte("test-passphrase"),
+			ReportWriter:                     &someStdout,
+		}, res)
+	}
 
 	// Invalid --format
 	opts = fakeSharedCopyOptions(t, []string{"--format", "invalid"})
 	_, _, err = opts.copyOptions(&someStdout)
 	assert.Error(t, err)
 
-	// More --sign-passphrase-file, --sign-by-sigstore-private-key, --sign-by-sigstore failure cases should be tested here.
+	// More --sign-by-sigstore-private-key, --sign-by-sigstore failure cases should be tested here.
+	// --sign-passphrase-file + more than one key option
+	for _, opts := range [][]string{
+		{"--sign-by", "gpgFingerprint", "--sign-by-sq-fingerprint", "sqFingerprint"},
+		{"--sign-by", "gpgFingerprint", "--sign-by-sigstore-private-key", "sigstorePrivateKey"},
+		{"--sign-by-sq-fingerprint", "sqFingerprint", "--sign-by-sigstore-private-key", "sigstorePrivateKey"},
+	} {
+		opts := fakeSharedCopyOptions(t, slices.Concat(opts, []string{
+			"--sign-passphrase-file", passphraseFile.Name(),
+		}))
+		_, _, err = opts.copyOptions(&someStdout)
+		assert.Error(t, err)
+	}
 
 	// --sign-passphrase-file not found
 	opts = fakeSharedCopyOptions(t, []string{

contrib/cirrus/runner.sh

@@ -99,7 +99,7 @@ _run_vendor() {
 
 _run_build() {
     make bin/skopeo BUILDTAGS="$BUILDTAGS"
-    make install PREFIX=/usr/local
+    make install PREFIX=/usr/local BUILDTAGS="$BUILDTAGS"
 }
 
 _run_cross() {

docs/skopeo-copy.1.md

@@ -107,9 +107,14 @@ See containers-sigstore-signing-params.yaml(5) for details about the file format
 
 Add a sigstore signature using a private key at _path_ for an image name corresponding to _destination-image_
 
+**--sign-by-sq-fingerprint** _fingerprint_
+
+Add a “simple signing” signature using a Sequoia-PGP key with the specified _fingerprint_.
+
 **--sign-passphrase-file** _path_
 
-The passphare to use when signing with `--sign-by` or `--sign-by-sigstore-private-key`. Only the first line will be read. A passphrase stored in a file is of questionable security if other users can read this file. Do not use this option if at all avoidable.
+The passphrase to use when signing with `--sign-by`, `--sign-by-sigstore-private-key` or `--sign-by-sq-fingerprint`.
+Only the first line will be read. A passphrase stored in a file is of questionable security if other users can read this file. Do not use this option if at all avoidable.
 
 **--sign-identity** _reference_
 

docs/skopeo-sync.1.md

@@ -103,9 +103,14 @@ See containers-sigstore-signing-params.yaml(5) for details about the file format
 
 Add a sigstore signature using a private key at _path_ for an image name corresponding to _destination-image_
 
+**--sign-by-sq-fingerprint** _fingerprint_
+
+Add a “simple signing” signature using a Sequoia-PGP key with the specified _fingerprint_.
+
 **--sign-passphrase-file** _path_
 
-The passphare to use when signing with `--sign-by` or `--sign-by-sigstore-private-key`. Only the first line will be read. A passphrase stored in a file is of questionable security if other users can read this file. Do not use this option if at all avoidable.
+The passphrase to use when signing with `--sign-by`, `--sign-by-sigstore-private-key` or `--sign-by-sq-fingerprint`.
+Only the first line will be read. A passphrase stored in a file is of questionable security if other users can read this file. Do not use this option if at all avoidable.
 
 **--src-creds** _username[:password]_ for accessing the source registry.