package main import ( "os/exec" "strings" "github.com/go-check/check" ) // ensure that an added file shows up in docker diff func (s *DockerSuite) TestDiffFilenameShownInOutput(c *check.C) { containerCmd := `echo foo > /root/bar` runCmd := exec.Command(dockerBinary, "run", "-d", "busybox", "sh", "-c", containerCmd) out, _, err := runCommandWithOutput(runCmd) if err != nil { c.Fatalf("failed to start the container: %s, %v", out, err) } cleanCID := strings.TrimSpace(out) diffCmd := exec.Command(dockerBinary, "diff", cleanCID) out, _, err = runCommandWithOutput(diffCmd) if err != nil { c.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 { c.Errorf("couldn't find the new file in docker diff's output: %v", out) } } // test to ensure GH #3840 doesn't occur any more func (s *DockerSuite) TestDiffEnsureDockerinitFilesAreIgnored(c *check.C) { // 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 { c.Fatal(out, err) } cleanCID := strings.TrimSpace(out) diffCmd := exec.Command(dockerBinary, "diff", cleanCID) out, _, err = runCommandWithOutput(diffCmd) if err != nil { c.Fatalf("failed to run diff: %s, %v", out, err) } for _, filename := range dockerinitFiles { if strings.Contains(out, filename) { c.Errorf("found file which should've been ignored %v in diff output", filename) } } } } func (s *DockerSuite) TestDiffEnsureOnlyKmsgAndPtmx(c *check.C) { runCmd := exec.Command(dockerBinary, "run", "-d", "busybox", "sleep", "0") out, _, err := runCommandWithOutput(runCmd) if err != nil { c.Fatal(out, err) } cleanCID := strings.TrimSpace(out) diffCmd := exec.Command(dockerBinary, "diff", cleanCID) out, _, err = runCommandWithOutput(diffCmd) if err != nil { c.Fatalf("failed to run diff: %s, %v", out, err) } expected := map[string]bool{ "C /dev": true, "A /dev/full": true, // busybox "C /dev/ptmx": true, // libcontainer "A /dev/kmsg": true, // lxc "A /dev/fd": true, "A /dev/fuse": true, "A /dev/ptmx": true, "A /dev/null": true, "A /dev/random": true, "A /dev/stdout": true, "A /dev/stderr": true, "A /dev/tty1": true, "A /dev/stdin": true, "A /dev/tty": true, "A /dev/urandom": true, "A /dev/zero": true, } for _, line := range strings.Split(out, "\n") { if line != "" && !expected[line] { c.Errorf("%q is shown in the diff but shouldn't", line) } } }