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Docker-DCO-1.1-Signed-off-by: Tibor Vass <teabee89@gmail.com> (github: tiborvass)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,40 @@ | ||
| package operatingsystem | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "errors" | ||
| "io/ioutil" | ||
| ) | ||
|
|
||
| var ( | ||
| // file to use to detect if the daemon is running in a container | ||
| proc1Cgroup = "/proc/1/cgroup" | ||
|
|
||
| // file to check to determine Operating System | ||
| etcOsRelease = "/etc/os-release" | ||
| ) | ||
|
|
||
| func GetOperatingSystem() (string, error) { | ||
| b, err := ioutil.ReadFile(etcOsRelease) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| if i := bytes.Index(b, []byte("PRETTY_NAME")); i >= 0 { | ||
| b = b[i+13:] | ||
| return string(b[:bytes.IndexByte(b, '"')]), nil | ||
| } | ||
| return "", errors.New("PRETTY_NAME not found") | ||
| } | ||
|
|
||
| func IsContainerized() (bool, error) { | ||
| b, err := ioutil.ReadFile(proc1Cgroup) | ||
| if err != nil { | ||
| return false, err | ||
| } | ||
| for _, line := range bytes.Split(b, []byte{'\n'}) { | ||
| if len(line) > 0 && !bytes.HasSuffix(line, []byte{'/'}) { | ||
| return true, nil | ||
| } | ||
| } | ||
| return false, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| package operatingsystem | ||
|
|
||
| import ( | ||
| "io/ioutil" | ||
| "os" | ||
| "path/filepath" | ||
| "testing" | ||
| ) | ||
|
|
||
| func TestGetOperatingSystem(t *testing.T) { | ||
| var ( | ||
| backup = etcOsRelease | ||
| ubuntuTrusty = []byte(`NAME="Ubuntu" | ||
| VERSION="14.04, Trusty Tahr" | ||
| ID=ubuntu | ||
| ID_LIKE=debian | ||
| PRETTY_NAME="Ubuntu 14.04 LTS" | ||
| VERSION_ID="14.04" | ||
| HOME_URL="http://www.ubuntu.com/" | ||
| SUPPORT_URL="http://help.ubuntu.com/" | ||
| BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"`) | ||
| gentoo = []byte(`NAME=Gentoo | ||
| ID=gentoo | ||
| PRETTY_NAME="Gentoo/Linux" | ||
| ANSI_COLOR="1;32" | ||
| HOME_URL="http://www.gentoo.org/" | ||
| SUPPORT_URL="http://www.gentoo.org/main/en/support.xml" | ||
| BUG_REPORT_URL="https://bugs.gentoo.org/" | ||
| `) | ||
| noPrettyName = []byte(`NAME="Ubuntu" | ||
| VERSION="14.04, Trusty Tahr" | ||
| ID=ubuntu | ||
| ID_LIKE=debian | ||
| VERSION_ID="14.04" | ||
| HOME_URL="http://www.ubuntu.com/" | ||
| SUPPORT_URL="http://help.ubuntu.com/" | ||
| BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"`) | ||
| ) | ||
|
|
||
| dir := os.TempDir() | ||
| defer func() { | ||
| etcOsRelease = backup | ||
| os.RemoveAll(dir) | ||
| }() | ||
|
|
||
| etcOsRelease = filepath.Join(dir, "etcOsRelease") | ||
| for expect, osRelease := range map[string][]byte{ | ||
| "Ubuntu 14.04 LTS": ubuntuTrusty, | ||
| "Gentoo/Linux": gentoo, | ||
| "": noPrettyName, | ||
| } { | ||
| if err := ioutil.WriteFile(etcOsRelease, osRelease, 0600); err != nil { | ||
| t.Fatalf("failed to write to %s: %v", etcOsRelease, err) | ||
| } | ||
| s, err := GetOperatingSystem() | ||
| if s != expect { | ||
| if expect == "" { | ||
| t.Fatalf("Expected error 'PRETTY_NAME not found', but got %v", err) | ||
| } else { | ||
| t.Fatalf("Expected '%s', but got '%s'. Err=%v", expect, s, err) | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func TestIsContainerized(t *testing.T) { | ||
| var ( | ||
| backup = proc1Cgroup | ||
| nonContainerizedProc1Cgroup = []byte(`14:name=systemd:/ | ||
| 13:hugetlb:/ | ||
| 12:net_prio:/ | ||
| 11:perf_event:/ | ||
| 10:bfqio:/ | ||
| 9:blkio:/ | ||
| 8:net_cls:/ | ||
| 7:freezer:/ | ||
| 6:devices:/ | ||
| 5:memory:/ | ||
| 4:cpuacct:/ | ||
| 3:cpu:/ | ||
| 2:cpuset:/ | ||
| `) | ||
| containerizedProc1Cgroup = []byte(`9:perf_event:/docker/3cef1b53c50b0fa357d994f8a1a8cd783c76bbf4f5dd08b226e38a8bd331338d | ||
| 8:blkio:/docker/3cef1b53c50b0fa357d994f8a1a8cd783c76bbf4f5dd08b226e38a8bd331338d | ||
| 7:net_cls:/ | ||
| 6:freezer:/docker/3cef1b53c50b0fa357d994f8a1a8cd783c76bbf4f5dd08b226e38a8bd331338d | ||
| 5:devices:/docker/3cef1b53c50b0fa357d994f8a1a8cd783c76bbf4f5dd08b226e38a8bd331338d | ||
| 4:memory:/docker/3cef1b53c50b0fa357d994f8a1a8cd783c76bbf4f5dd08b226e38a8bd331338d | ||
| 3:cpuacct:/docker/3cef1b53c50b0fa357d994f8a1a8cd783c76bbf4f5dd08b226e38a8bd331338d | ||
| 2:cpu:/docker/3cef1b53c50b0fa357d994f8a1a8cd783c76bbf4f5dd08b226e38a8bd331338d | ||
| 1:cpuset:/`) | ||
| ) | ||
|
|
||
| dir := os.TempDir() | ||
| defer func() { | ||
| proc1Cgroup = backup | ||
| os.RemoveAll(dir) | ||
| }() | ||
|
|
||
| proc1Cgroup = filepath.Join(dir, "proc1Cgroup") | ||
|
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| if err := ioutil.WriteFile(proc1Cgroup, nonContainerizedProc1Cgroup, 0600); err != nil { | ||
| t.Fatalf("failed to write to %s: %v", proc1Cgroup, err) | ||
| } | ||
| inContainer, err := IsContainerized() | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| if inContainer { | ||
| t.Fatal("Wrongly assuming containerized") | ||
| } | ||
|
|
||
| if err := ioutil.WriteFile(proc1Cgroup, containerizedProc1Cgroup, 0600); err != nil { | ||
| t.Fatalf("failed to write to %s: %v", proc1Cgroup, err) | ||
| } | ||
| inContainer, err = IsContainerized() | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| if !inContainer { | ||
| t.Fatal("Wrongly assuming non-containerized") | ||
| } | ||
| } |
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