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// Copyright 2018 Google LLC All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package crane_test
import (
"archive/tar"
"errors"
"io"
"testing"
"github.com/google/go-containerregistry/pkg/crane"
)
func TestLayer(t *testing.T) {
tcs := []struct {
Name string
FileMap map[string][]byte
Digest string
}{{
Name: "Empty contents",
Digest: "sha256:89732bc7504122601f40269fc9ddfb70982e633ea9caf641ae45736f2846b004",
}, {
Name: "One file",
FileMap: map[string][]byte{
"/test": []byte("testy"),
},
Digest: "sha256:ec3ff19f471b99a76fb1c339c1dfdaa944a4fba25be6bcdc99fe7e772103079e",
}, {
Name: "Two files",
FileMap: map[string][]byte{
"/test": []byte("testy"),
"/testalt": []byte("footesty"),
},
Digest: "sha256:a48bcb7be3ab3ec608ee56eb80901224e19e31dc096cc06a8fd3a8dae1aa8947",
}, {
Name: "Many files",
FileMap: map[string][]byte{
"/1": []byte("1"),
"/2": []byte("2"),
"/3": []byte("3"),
"/4": []byte("4"),
"/5": []byte("5"),
"/6": []byte("6"),
"/7": []byte("7"),
"/8": []byte("8"),
"/9": []byte("9"),
},
Digest: "sha256:1e637602abbcab2dcedcc24e0b7c19763454a47261f1658b57569530b369ccb9",
}}
for _, tc := range tcs {
t.Run(tc.Name, func(t *testing.T) {
l, err := crane.Layer(tc.FileMap)
if err != nil {
t.Fatalf("Error calling layer: %v", err)
}
d, err := l.Digest()
if err != nil {
t.Fatalf("Error calling digest: %v", err)
}
if d.String() != tc.Digest {
t.Errorf("Incorrect digest, want %q, got %q", tc.Digest, d.String())
}
// Check contents match.
rc, err := l.Uncompressed()
if err != nil {
t.Fatalf("Uncompressed: %v", err)
}
defer rc.Close()
tr := tar.NewReader(rc)
saw := map[string]struct{}{}
for {
th, err := tr.Next()
if errors.Is(err, io.EOF) {
break
}
if err != nil {
t.Fatalf("Next: %v", err)
}
saw[th.Name] = struct{}{}
want, found := tc.FileMap[th.Name]
if !found {
t.Errorf("found %q, not in original map", th.Name)
continue
}
got, err := io.ReadAll(tr)
if err != nil {
t.Fatalf("ReadAll(%q): %v", th.Name, err)
}
if string(want) != string(got) {
t.Errorf("File %q: got %v, want %v", th.Name, string(got), string(want))
}
}
for k := range saw {
delete(tc.FileMap, k)
}
for k := range tc.FileMap {
t.Errorf("Layer did not contain %q", k)
}
})
t.Run(tc.Name+" is reproducible", func(t *testing.T) {
l1, _ := crane.Layer(tc.FileMap)
l2, _ := crane.Layer(tc.FileMap)
d1, _ := l1.Digest()
d2, _ := l2.Digest()
if d1 != d2 {
t.Fatalf("Non matching digests, want %q, got %q", d1, d2)
}
})
}
}
func TestImage(t *testing.T) {
tcs := []struct {
Name string
FileMap map[string][]byte
Digest string
}{{
Name: "Empty contents",
Digest: "sha256:98132f58b523c391a5788997327cac95e114e3a6609d01163189774510705399",
}, {
Name: "One file",
FileMap: map[string][]byte{
"/test": []byte("testy"),
},
Digest: "sha256:d905c03ac635172a96c12b8af6c90cfd028e3edaa3114b31a9e196ab38c16963",
}, {
Name: "Two files",
FileMap: map[string][]byte{
"/test": []byte("testy"),
"/bar": []byte("not useful"),
},
Digest: "sha256:20e7e4800e5eb167f170970936c08d9e1bcbe91372420eeb6ab8d1a07752c3a3",
}, {
Name: "Many files",
FileMap: map[string][]byte{
"/1": []byte("1"),
"/2": []byte("2"),
"/3": []byte("3"),
"/4": []byte("4"),
"/5": []byte("5"),
"/6": []byte("6"),
"/7": []byte("7"),
"/8": []byte("8"),
"/9": []byte("9"),
},
Digest: "sha256:dfca2803510c8e3b83a3151f7c035c60cfa2a8a52465b802e18b85014de361f1",
}}
for _, tc := range tcs {
t.Run(tc.Name, func(t *testing.T) {
i, err := crane.Image(tc.FileMap)
if err != nil {
t.Fatalf("Error calling image: %v", err)
}
d, err := i.Digest()
if err != nil {
t.Fatalf("Error calling digest: %v", err)
}
if d.String() != tc.Digest {
t.Fatalf("Incorrect digest, want %q, got %q", tc.Digest, d.String())
}
})
t.Run(tc.Name+" is reproducible", func(t *testing.T) {
i1, _ := crane.Image(tc.FileMap)
i2, _ := crane.Image(tc.FileMap)
d1, _ := i1.Digest()
d2, _ := i2.Digest()
if d1 != d2 {
t.Fatalf("Non matching digests, want %q, got %q", d1, d2)
}
})
}
}
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