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moby--moby/integration-cli/docker_cli_diff_test.go

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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")
}