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package main

import (

"os/exec"

"strings"

"testing"

)

// ensure that an added file shows up in docker diff

func TestDiffFilenameShownInOutput(t *testing.T) {

containerCmd := `echo foo > /root/bar`

runCmd := exec.Command(dockerBinary, "run", "-d", "busybox", "sh", "-c", containerCmd)

out, _, err := runCommandWithOutput(runCmd)

if err != nil {

t.Fatalf("failed to start the container: %s, %v", out, err)

}

cleanCID := stripTrailingCharacters(out)

diffCmd := exec.Command(dockerBinary, "diff", cleanCID)

out, _, err = runCommandWithOutput(diffCmd)

if err != nil {

t.Fatalf("failed to run diff: %s %v", out, err)

}

found := false

for _, line := range strings.Split(out, "\n") {

if strings.Contains("A /root/bar", line) {

found = true

break

}

}

if !found {

t.Errorf("couldn't find the new file in docker diff's output: %v", out)

}

deleteContainer(cleanCID)

logDone("diff - check if created file shows up")

}

// test to ensure GH #3840 doesn't occur any more

func TestDiffEnsureDockerinitFilesAreIgnored(t *testing.T) {

// this is a list of files which shouldn't show up in `docker diff`

dockerinitFiles := []string{"/etc/resolv.conf", "/etc/hostname", "/etc/hosts", "/.dockerinit", "/.dockerenv"}

// we might not run into this problem from the first run, so start a few containers

for i := 0; i < 20; i++ {

containerCmd := `echo foo > /root/bar`

runCmd := exec.Command(dockerBinary, "run", "-d", "busybox", "sh", "-c", containerCmd)

out, _, err := runCommandWithOutput(runCmd)

if err != nil {

t.Fatal(out, err)

}

cleanCID := stripTrailingCharacters(out)

diffCmd := exec.Command(dockerBinary, "diff", cleanCID)

out, _, err = runCommandWithOutput(diffCmd)

if err != nil {

t.Fatalf("failed to run diff: %s, %v", out, err)

}

deleteContainer(cleanCID)

for _, filename := range dockerinitFiles {

if strings.Contains(out, filename) {

t.Errorf("found file which should've been ignored %v in diff output", filename)

}

}

}

logDone("diff - check if ignored files show up in diff")

}

func TestDiffEnsureOnlyKmsgAndPtmx(t *testing.T) {

runCmd := exec.Command(dockerBinary, "run", "-d", "busybox", "sleep", "0")

out, _, err := runCommandWithOutput(runCmd)

if err != nil {

t.Fatal(out, err)

}

cleanCID := stripTrailingCharacters(out)

diffCmd := exec.Command(dockerBinary, "diff", cleanCID)

out, _, err = runCommandWithOutput(diffCmd)

if err != nil {

t.Fatalf("failed to run diff: %s, %v", out, err)

}

deleteContainer(cleanCID)

expected := map[string]bool{

"C /dev": true,

"A /dev/full": true, // busybox

"C /dev/ptmx": true, // libcontainer

"A /dev/kmsg": true, // lxc

}

for _, line := range strings.Split(out, "\n") {

if line != "" && !expected[line] {

t.Errorf("%q is shown in the diff but shouldn't", line)

}

}

logDone("diff - ensure that only kmsg and ptmx in diff")

}