Merge pull request #104 from ndeloof/ResolveImages

introduce Project.ResolveImages to use image digests

go.mod

@@ -3,16 +3,20 @@ module github.com/compose-spec/compose-go
 go 1.13
 
 require (
+	github.com/distribution/distribution/v3 v3.0.0-20210209042832-22c074842eaa
 	github.com/docker/go-connections v0.4.0
 	github.com/docker/go-units v0.4.0
 	github.com/google/go-cmp v0.5.4
 	github.com/imdario/mergo v0.3.11
 	github.com/joho/godotenv v1.3.0
 	github.com/mattn/go-shellwords v1.0.11
 	github.com/mitchellh/mapstructure v1.4.1
+	github.com/opencontainers/go-digest v1.0.0
+	github.com/opencontainers/image-spec v1.0.1 // indirect
 	github.com/pkg/errors v0.9.1
 	github.com/sirupsen/logrus v1.7.0
 	github.com/xeipuuv/gojsonschema v1.2.0
+	golang.org/x/sync v0.0.0-20190423024810-112230192c58
 	golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd // indirect
 	gopkg.in/yaml.v2 v2.4.0
 	gotest.tools/v3 v3.0.3

go.sum

@@ -1,53 +1,166 @@
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types/project.go

@@ -21,6 +21,10 @@ import (
 	"os"
 	"path/filepath"
 	"sort"
+
+	"github.com/distribution/distribution/v3/reference"
+	"github.com/opencontainers/go-digest"
+	"golang.org/x/sync/errgroup"
 )
 
 // Project is the result of loading a set of compose files
@@ -237,3 +241,40 @@ func (p *Project) ForServices(names []string) error {
 	p.Services = enabled
 	return nil
 }
+
+// ResolveImages updates services images to include digest computed by a resolver function
+func (p *Project) ResolveImages(resolver func(named reference.Named) (digest.Digest, error)) error {
+	eg := errgroup.Group{}
+	for i, s := range p.Services {
+		idx := i
+		service := s
+
+		if service.Image == "" {
+			continue
+		}
+		eg.Go(func() error {
+			named, err := reference.ParseDockerRef(service.Image)
+			if err != nil {
+				return err
+			}
+
+			if _, ok := named.(reference.Canonical); !ok {
+				// image is named but not digested reference
+				digest, err := resolver(named)
+				if err != nil {
+					return err
+				}
+
+				named, err = reference.WithDigest(named, digest)
+				if err != nil {
+					return err
+				}
+			}
+
+			service.Image = named.String()
+			p.Services[idx] = service
+			return nil
+		})
+	}
+	return eg.Wait()
+}

types/project_test.go

@@ -17,8 +17,11 @@
 package types
 
 import (
+	_ "crypto/sha256"
 	"testing"
 
+	"github.com/distribution/distribution/v3/reference"
+	"github.com/opencontainers/go-digest"
 	"gotest.tools/v3/assert"
 )
 
@@ -74,3 +77,43 @@ func makeProject() Project {
 			}),
 	}
 }
+
+func Test_ResolveImages(t *testing.T) {
+	p := makeProject()
+	resolver := func(named reference.Named) (digest.Digest, error) {
+		return "sha256:1234567890123456789012345678901234567890123456789012345678901234", nil
+	}
+
+	tests := []struct {
+		image    string
+		resolved string
+	}{
+		{
+			image:    "com.acme/long:tag",
+			resolved: "com.acme/long:tag@sha256:1234567890123456789012345678901234567890123456789012345678901234",
+		},
+		{
+			image:    "com.acme/long",
+			resolved: "com.acme/long:latest@sha256:1234567890123456789012345678901234567890123456789012345678901234",
+		},
+		{
+			image:    "short",
+			resolved: "docker.io/library/short:latest@sha256:1234567890123456789012345678901234567890123456789012345678901234",
+		},
+		{
+			image:    "com.acme/digested:tag@sha256:1234567890123456789012345678901234567890123456789012345678901234",
+			resolved: "com.acme/digested@sha256:1234567890123456789012345678901234567890123456789012345678901234",
+		},
+		{
+			image:    "com.acme/digested@sha256:1234567890123456789012345678901234567890123456789012345678901234",
+			resolved: "com.acme/digested@sha256:1234567890123456789012345678901234567890123456789012345678901234",
+		},
+	}
+
+	for _, test := range tests {
+		p.Services[0].Image = test.image
+		err := p.ResolveImages(resolver)
+		assert.NilError(t, err)
+		assert.Equal(t, p.Services[0].Image, test.resolved)
+	}
+}