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dockerfile_test.go
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dockerfile_test.go
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/*
Copyright 2018 Google LLC
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 dockerfile
import (
"fmt"
"io/ioutil"
"os"
"reflect"
"testing"
"github.com/GoogleContainerTools/kaniko/pkg/config"
"github.com/GoogleContainerTools/kaniko/testutil"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/moby/buildkit/frontend/dockerfile/instructions"
)
func Test_ParseStages_ArgValueWithQuotes(t *testing.T) {
dockerfile := `
ARG IMAGE="ubuntu:16.04"
ARG FOO=bar
ARG HELLO="Hello"
ARG WORLD="World"
ARG NESTED="$HELLO $WORLD"
FROM ${IMAGE}
RUN echo hi > /hi
FROM scratch AS second
COPY --from=0 /hi /hi2
FROM scratch
COPY --from=second /hi2 /hi3
`
tmpfile, err := ioutil.TempFile("", "Dockerfile.test")
if err != nil {
t.Fatal(err)
}
defer os.Remove(tmpfile.Name())
if _, err := tmpfile.Write([]byte(dockerfile)); err != nil {
t.Fatal(err)
}
if err := tmpfile.Close(); err != nil {
t.Fatal(err)
}
stages, metaArgs, err := ParseStages(&config.KanikoOptions{DockerfilePath: tmpfile.Name()})
if err != nil {
t.Fatal(err)
}
if len(stages) == 0 {
t.Fatal("length of stages expected to be greater than zero, but was zero")
}
if len(metaArgs) != 5 {
t.Fatalf("length of stage meta args expected to be 5, but was %d", len(metaArgs))
}
for i, expectedVal := range []string{"ubuntu:16.04", "bar", "Hello", "World", "Hello World"} {
if metaArgs[i].Args[0].ValueString() != expectedVal {
t.Fatalf("expected metaArg %d val to be %s but was %s", i, expectedVal, metaArgs[i].Args[0].ValueString())
}
}
}
func Test_stripEnclosingQuotes(t *testing.T) {
type testCase struct {
name string
inArgs []instructions.ArgCommand
expected []string
success bool
}
newArgCommand := func(key, val string) instructions.ArgCommand {
return instructions.ArgCommand{
Args: []instructions.KeyValuePairOptional{{Key: key, Value: &val}},
}
}
cases := []testCase{{
name: "value with no enclosing quotes",
inArgs: []instructions.ArgCommand{newArgCommand("MEOW", "Purr")},
expected: []string{"Purr"},
success: true,
}, {
name: "value with unmatched leading double quote",
inArgs: []instructions.ArgCommand{newArgCommand("MEOW", "\"Purr")},
}, {
name: "value with unmatched trailing double quote",
inArgs: []instructions.ArgCommand{newArgCommand("MEOW", "Purr\"")},
}, {
name: "value with enclosing double quotes",
inArgs: []instructions.ArgCommand{newArgCommand("MEOW", "\"mrow\"")},
expected: []string{"mrow"},
success: true,
}, {
name: "value with unmatched leading single quote",
inArgs: []instructions.ArgCommand{newArgCommand("MEOW", "'Purr")},
}, {
name: "value with unmatched trailing single quote",
inArgs: []instructions.ArgCommand{newArgCommand("MEOW", "Purr'")},
}, {
name: "value with enclosing single quotes",
inArgs: []instructions.ArgCommand{newArgCommand("MEOW", "'mrow'")},
expected: []string{"mrow"},
success: true,
}, {
name: "blank value with enclosing double quotes",
inArgs: []instructions.ArgCommand{newArgCommand("MEOW", `""`)},
expected: []string{""},
success: true,
}, {
name: "blank value with enclosing single quotes",
inArgs: []instructions.ArgCommand{newArgCommand("MEOW", "''")},
expected: []string{""},
success: true,
}, {
name: "value with escaped, enclosing double quotes",
inArgs: []instructions.ArgCommand{newArgCommand("MEOW", `\"Purr\"`)},
expected: []string{`\"Purr\"`},
success: true,
}, {
name: "value with escaped, enclosing single quotes",
inArgs: []instructions.ArgCommand{newArgCommand("MEOW", `\'Purr\'`)},
expected: []string{`\'Purr\'`},
success: true,
}, {
name: "multiple values enclosed with single quotes",
inArgs: []instructions.ArgCommand{
newArgCommand("MEOW", `'Purr'`),
newArgCommand("MEW", `'Mrow'`),
},
expected: []string{"Purr", "Mrow"},
success: true,
}, {
name: "multiple values, one blank, one a single int",
inArgs: []instructions.ArgCommand{
newArgCommand("MEOW", `""`),
newArgCommand("MEW", `1`),
},
expected: []string{"", "1"},
success: true,
}, {
name: "no values",
success: true,
}}
for _, test := range cases {
t.Run(test.name, func(t *testing.T) {
inArgs := test.inArgs
expected := test.expected
success := test.success
out, err := stripEnclosingQuotes(inArgs)
if success && err != nil {
t.Fatal(err)
}
if !success && err == nil {
t.Fatal("expected an error but none received")
}
if len(expected) != len(out) {
t.Fatalf("Expected %d args but got %d", len(expected), len(out))
}
for i := range out {
if expected[i] != out[i].Args[0].ValueString() {
t.Errorf(
"Expected arg at index %d to equal %v but instead equaled %v",
i,
expected[i],
out[i].Args[0].ValueString())
}
}
})
}
}
func Test_GetOnBuildInstructions(t *testing.T) {
type testCase struct {
name string
cfg *v1.Config
stageToIdx map[string]string
expCommands []instructions.Command
}
tests := []testCase{
{name: "no on-build on config",
cfg: &v1.Config{},
stageToIdx: map[string]string{"builder": "0"},
expCommands: nil,
},
{name: "onBuild on config, nothing to resolve",
cfg: &v1.Config{OnBuild: []string{"WORKDIR /app"}},
stageToIdx: map[string]string{"builder": "0", "temp": "1"},
expCommands: []instructions.Command{&instructions.WorkdirCommand{Path: "/app"}},
},
{name: "onBuild on config, resolve multiple stages",
cfg: &v1.Config{OnBuild: []string{"COPY --from=builder a.txt b.txt", "COPY --from=temp /app /app"}},
stageToIdx: map[string]string{"builder": "0", "temp": "1"},
expCommands: []instructions.Command{
&instructions.CopyCommand{
SourcesAndDest: []string{"a.txt b.txt"},
From: "0",
},
&instructions.CopyCommand{
SourcesAndDest: []string{"/app /app"},
From: "1",
},
}},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
cmds, err := GetOnBuildInstructions(test.cfg, test.stageToIdx)
if err != nil {
t.Fatalf("Failed to parse config for on-build instructions")
}
if len(cmds) != len(test.expCommands) {
t.Fatalf("Expected %d commands, got %d", len(test.expCommands), len(cmds))
}
for i, cmd := range cmds {
if reflect.TypeOf(cmd) != reflect.TypeOf(test.expCommands[i]) {
t.Fatalf("Got command %s, expected %s", cmd, test.expCommands[i])
}
switch c := cmd.(type) {
case *instructions.CopyCommand:
{
exp := test.expCommands[i].(*instructions.CopyCommand)
testutil.CheckDeepEqual(t, exp.From, c.From)
}
}
}
})
}
}
func Test_targetStage(t *testing.T) {
dockerfile := `
FROM scratch
RUN echo hi > /hi
FROM scratch AS second
COPY --from=0 /hi /hi2
FROM scratch
COPY --from=second /hi2 /hi3
`
stages, _, err := Parse([]byte(dockerfile))
if err != nil {
t.Fatal(err)
}
tests := []struct {
name string
target string
targetIndex int
shouldErr bool
}{
{
name: "test valid target",
target: "second",
targetIndex: 1,
shouldErr: false,
},
{
name: "test no target",
target: "",
targetIndex: 2,
shouldErr: false,
},
{
name: "test invalid target",
target: "invalid",
targetIndex: -1,
shouldErr: true,
},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
target, err := targetStage(stages, test.target)
testutil.CheckError(t, test.shouldErr, err)
if !test.shouldErr {
if target != test.targetIndex {
t.Errorf("got incorrect target, expected %d got %d", test.targetIndex, target)
}
}
})
}
}
func Test_SaveStage(t *testing.T) {
tests := []struct {
name string
index int
expected bool
}{
{
name: "reference stage in later copy command",
index: 0,
expected: false,
},
{
name: "reference stage in later from command",
index: 1,
expected: true,
},
{
name: "don't reference stage later",
index: 2,
expected: false,
},
{
name: "reference current stage in next stage",
index: 4,
expected: true,
},
{
name: "from prebuilt stage, and reference current stage in next stage",
index: 5,
expected: true,
},
{
name: "final stage",
index: 6,
expected: false,
},
}
stages, _, err := Parse([]byte(testutil.Dockerfile))
if err != nil {
t.Fatalf("couldn't retrieve stages from Dockerfile: %v", err)
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
actual := saveStage(test.index, stages)
testutil.CheckErrorAndDeepEqual(t, false, nil, test.expected, actual)
})
}
}
func Test_baseImageIndex(t *testing.T) {
tests := []struct {
name string
currentStage int
expected int
}{
{
name: "stage that is built off of a previous stage",
currentStage: 2,
expected: 1,
},
{
name: "another stage that is built off of a previous stage",
currentStage: 5,
expected: 4,
},
{
name: "stage that isn't built off of a previous stage",
currentStage: 4,
expected: -1,
},
}
stages, _, err := Parse([]byte(testutil.Dockerfile))
if err != nil {
t.Fatalf("couldn't retrieve stages from Dockerfile: %v", err)
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
actual := baseImageIndex(test.currentStage, stages)
if actual != test.expected {
t.Fatalf("unexpected result, expected %d got %d", test.expected, actual)
}
})
}
}
func Test_ResolveStagesArgs(t *testing.T) {
dockerfile := `
ARG IMAGE="ubuntu:16.04"
ARG LAST_STAGE_VARIANT
FROM ${IMAGE} as base
RUN echo hi > /hi
FROM base AS base-dev
RUN echo dev >> /hi
FROM base AS base-prod
RUN echo prod >> /hi
FROM base-${LAST_STAGE_VARIANT}
RUN cat /hi
`
buildArgLastVariants := []string{"dev", "prod"}
buildArgImages := []string{"alpine:3.11", ""}
var expectedImage string
for _, buildArgLastVariant := range buildArgLastVariants {
for _, buildArgImage := range buildArgImages {
if buildArgImage != "" {
expectedImage = buildArgImage
} else {
expectedImage = "ubuntu:16.04"
}
buildArgs := []string{fmt.Sprintf("IMAGE=%s", buildArgImage), fmt.Sprintf("LAST_STAGE_VARIANT=%s", buildArgLastVariant)}
stages, metaArgs, err := Parse([]byte(dockerfile))
if err != nil {
t.Fatal(err)
}
stagesLen := len(stages)
args := unifyArgs(metaArgs, buildArgs)
if err := resolveStagesArgs(stages, args); err != nil {
t.Fatalf("fail to resolves args %v: %v", buildArgs, err)
}
tests := []struct {
name string
actualSourceCode string
actualBaseName string
expectedSourceCode string
expectedBaseName string
}{
{
name: "Test_BuildArg_From_First_Stage",
actualSourceCode: stages[0].SourceCode,
actualBaseName: stages[0].BaseName,
expectedSourceCode: "FROM ${IMAGE} as base",
expectedBaseName: expectedImage,
},
{
name: "Test_BuildArg_From_Last_Stage",
actualSourceCode: stages[stagesLen-1].SourceCode,
actualBaseName: stages[stagesLen-1].BaseName,
expectedSourceCode: "FROM base-${LAST_STAGE_VARIANT}",
expectedBaseName: fmt.Sprintf("base-%s", buildArgLastVariant),
},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
testutil.CheckDeepEqual(t, test.expectedSourceCode, test.actualSourceCode)
testutil.CheckDeepEqual(t, test.expectedBaseName, test.actualBaseName)
})
}
}
}
}
func Test_SkipingUnusedStages(t *testing.T) {
tests := []struct {
description string
dockerfile string
targets []string
expectedSourceCodes map[string][]string
expectedTargetIndexBeforeSkip map[string]int
expectedTargetIndexAfterSkip map[string]int
}{
{
description: "dockerfile_without_copyFrom",
dockerfile: `
FROM alpine:3.11 AS base-dev
RUN echo dev > /hi
FROM alpine:3.11 AS base-prod
RUN echo prod > /hi
FROM base-dev as final-stage
RUN cat /hi
`,
targets: []string{"base-dev", "base-prod", ""},
expectedSourceCodes: map[string][]string{
"base-dev": {"FROM alpine:3.11 AS base-dev"},
"base-prod": {"FROM alpine:3.11 AS base-prod"},
"": {"FROM alpine:3.11 AS base-dev", "FROM base-dev as final-stage"},
},
expectedTargetIndexBeforeSkip: map[string]int{
"base-dev": 0,
"base-prod": 1,
"": 2,
},
expectedTargetIndexAfterSkip: map[string]int{
"base-dev": 0,
"base-prod": 0,
"": 1,
},
},
{
description: "dockerfile_with_copyFrom",
dockerfile: `
FROM alpine:3.11 AS base-dev
RUN echo dev > /hi
FROM alpine:3.11 AS base-prod
RUN echo prod > /hi
FROM alpine:3.11
COPY --from=base-prod /hi /finalhi
RUN cat /finalhi
`,
targets: []string{"base-dev", "base-prod", ""},
expectedSourceCodes: map[string][]string{
"base-dev": {"FROM alpine:3.11 AS base-dev"},
"base-prod": {"FROM alpine:3.11 AS base-prod"},
"": {"FROM alpine:3.11 AS base-prod", "FROM alpine:3.11"},
},
expectedTargetIndexBeforeSkip: map[string]int{
"base-dev": 0,
"base-prod": 1,
"": 2,
},
expectedTargetIndexAfterSkip: map[string]int{
"base-dev": 0,
"base-prod": 0,
"": 1,
},
},
{
description: "dockerfile_with_two_copyFrom",
dockerfile: `
FROM alpine:3.11 AS base-dev
RUN echo dev > /hi
FROM alpine:3.11 AS base-prod
RUN echo prod > /hi
FROM alpine:3.11
COPY --from=base-dev /hi /finalhidev
COPY --from=base-prod /hi /finalhiprod
RUN cat /finalhidev
RUN cat /finalhiprod
`,
targets: []string{"base-dev", "base-prod", ""},
expectedSourceCodes: map[string][]string{
"base-dev": {"FROM alpine:3.11 AS base-dev"},
"base-prod": {"FROM alpine:3.11 AS base-prod"},
"": {"FROM alpine:3.11 AS base-dev", "FROM alpine:3.11 AS base-prod", "FROM alpine:3.11"},
},
expectedTargetIndexBeforeSkip: map[string]int{
"base-dev": 0,
"base-prod": 1,
"": 2,
},
expectedTargetIndexAfterSkip: map[string]int{
"base-dev": 0,
"base-prod": 0,
"": 2,
},
},
{
description: "dockerfile_with_two_copyFrom_and_arg",
dockerfile: `
FROM debian:9.11 as base
COPY . .
FROM scratch as second
ENV foopath context/foo
COPY --from=0 $foopath context/b* /foo/
FROM second as third
COPY --from=base /context/foo /new/foo
FROM base as fourth
# Make sure that we snapshot intermediate images correctly
RUN date > /date
ENV foo bar
# This base image contains symlinks with relative paths to ignored directories
# We need to test they're extracted correctly
FROM fedora@sha256:c4cc32b09c6ae3f1353e7e33a8dda93dc41676b923d6d89afa996b421cc5aa48
FROM fourth
ARG file=/foo2
COPY --from=second /foo ${file}
COPY --from=debian:9.11 /etc/os-release /new
`,
targets: []string{"base", ""},
expectedSourceCodes: map[string][]string{
"base": {"FROM debian:9.11 as base"},
"second": {"FROM debian:9.11 as base", "FROM scratch as second"},
"": {"FROM debian:9.11 as base", "FROM scratch as second", "FROM base as fourth", "FROM fourth"},
},
expectedTargetIndexBeforeSkip: map[string]int{
"base": 0,
"second": 1,
"": 5,
},
expectedTargetIndexAfterSkip: map[string]int{
"base": 0,
"second": 1,
"": 3,
},
},
{
description: "dockerfile_without_final_dependencies",
dockerfile: `
FROM alpine:3.11
FROM debian:9.11 as base
RUN echo foo > /foo
FROM debian:9.11 as fizz
RUN echo fizz >> /fizz
COPY --from=base /foo /fizz
FROM alpine:3.11 as buzz
RUN echo buzz > /buzz
FROM alpine:3.11 as final
RUN echo bar > /bar
`,
targets: []string{"final", "buzz", "fizz", ""},
expectedSourceCodes: map[string][]string{
"final": {"FROM alpine:3.11 as final"},
"buzz": {"FROM alpine:3.11 as buzz"},
"fizz": {"FROM debian:9.11 as base", "FROM debian:9.11 as fizz"},
"": {"FROM alpine:3.11", "FROM debian:9.11 as base", "FROM debian:9.11 as fizz", "FROM alpine:3.11 as buzz", "FROM alpine:3.11 as final"},
},
expectedTargetIndexBeforeSkip: map[string]int{
"final": 4,
"buzz": 3,
"fizz": 2,
"": 4,
},
expectedTargetIndexAfterSkip: map[string]int{
"final": 0,
"buzz": 0,
"fizz": 1,
"": 4,
},
},
}
for _, test := range tests {
stages, _, err := Parse([]byte(test.dockerfile))
testutil.CheckError(t, false, err)
actualSourceCodes := make(map[string][]string)
for _, target := range test.targets {
targetIndex, err := targetStage(stages, target)
testutil.CheckError(t, false, err)
targetIndexBeforeSkip := targetIndex
onlyUsedStages := skipUnusedStages(stages, &targetIndex, target)
for _, s := range onlyUsedStages {
actualSourceCodes[target] = append(actualSourceCodes[target], s.SourceCode)
}
t.Run(test.description, func(t *testing.T) {
testutil.CheckDeepEqual(t, test.expectedSourceCodes[target], actualSourceCodes[target])
testutil.CheckDeepEqual(t, test.expectedTargetIndexBeforeSkip[target], targetIndexBeforeSkip)
testutil.CheckDeepEqual(t, test.expectedTargetIndexAfterSkip[target], targetIndex)
})
}
}
}