Repository: compose-spec/compose-go
Pull request #104 (2021-02-17 09:40:03)

introduce Project.ResolveImages to use image digests
Passing a resolver func, this allows a compose project to use digested image references


Patch:
diff --git a/go.mod b/go.mod
index 5ec159f..c999440 100644
--- a/go.mod
+++ b/go.mod
@@ -3,6 +3,7 @@ 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
@@ -10,9 +11,12 @@ require (
 	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
diff --git a/go.sum b/go.sum
index bf1eef0..e750d04 100644
--- a/go.sum
+++ b/go.sum
@@ -1,44 +1,149 @@
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+github.com/yvasiyarov/go-metrics v0.0.0-20140926110328-57bccd1ccd43/go.mod h1:aX5oPXxHm3bOH+xeAttToC8pqch2ScQN/JoXYupl6xs=
+github.com/yvasiyarov/gorelic v0.0.0-20141212073537-a9bba5b9ab50/go.mod h1:NUSPSUX/bi6SeDMUh6brw0nXpxHnc96TguQh0+r/ssA=
+github.com/yvasiyarov/newrelic_platform_go v0.0.0-20140908184405-b21fdbd4370f/go.mod h1:GlGEuHIJweS1mbCqG+7vt2nvWLzLLnRHbXz5JKd/Qbg=
+golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
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+golang.org/x/net v0.0.0-20181114220301-adae6a3d119a/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/net v0.0.0-20190108225652-1e06a53dbb7e/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
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+golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
+golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58 h1:8gQV6CLnAEikrhgkHFbMAEhagSSnXWGV915qUMm9mrU=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190801041406-cbf593c0f2f3/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd h1:xhmwyvizuTgC2qz7ZlMluP20uW+C3Rm0FD/WLDX8884=
 golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -46,8 +151,16 @@ golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/tools v0.0.0-20190624222133-a101b041ded4/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+google.golang.org/api v0.0.0-20160322025152-9bf6e6e569ff/go.mod h1:4mhQ8q/RsB7i+udVvVy5NUi08OU8ZlA0gRVgrF7VFY0=
+google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
+google.golang.org/cloud v0.0.0-20151119220103-975617b05ea8/go.mod h1:0H1ncTHf11KCFhTc/+EFRbzSCOZx+VUbRMk55Yv5MYk=
+google.golang.org/grpc v0.0.0-20160317175043-d3ddb4469d5a/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
+gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20141024133853-64131543e789/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
diff --git a/types/project.go b/types/project.go
index f4e947b..cff7821 100644
--- a/types/project.go
+++ b/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()
+}


Test patch:
diff --git a/types/project_test.go b/types/project_test.go
index 66b68c1..47ee04d 100644
--- a/types/project_test.go
+++ b/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)
+	}
+}