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Enhance container detection on some corner cases.

Browse source 
Not really bullet-proof, users can still create cgroups with name like
"foo:/init.scope" or "\nfoo" to bypass the detection. However, solving
these cases will require kernel to provide a better interface.

Signed-off-by: Robert Wang <robert@arctic.tw>
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
This commit is contained in:
Robert Wang 2018-01-17 14:16:04 +08:00 committed by Michael Crosby
parent fb459f6671
commit 2f9e62611e
2 changed files with 15 additions and 1 deletions
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2
pkg/parsers/operatingsystem/operatingsystem_linux.go
View file

@ -84,7 +84,7 @@ func IsContainerized() (bool, error) {
return false, err
}
for _, line := range bytes.Split(b, []byte{'\n'}) {
if len(line) > 0 && !bytes.HasSuffix(line, []byte{'/'}) && !bytes.HasSuffix(line, []byte("init.scope")) {
if len(line) > 0 && !bytes.HasSuffix(line, []byte(":/")) && !bytes.HasSuffix(line, []byte(":/init.scope")) {
return true, nil
}
}

14
pkg/parsers/operatingsystem/operatingsystem_linux_test.go
View file

@ -215,6 +215,9 @@ func TestIsContainerized(t *testing.T) {
3:cpuacct:/docker/3cef1b53c50b0fa357d994f8a1a8cd783c76bbf4f5dd08b226e38a8bd331338d
2:cpu:/docker/3cef1b53c50b0fa357d994f8a1a8cd783c76bbf4f5dd08b226e38a8bd331338d
1:cpuset:/`)
nonContainerizedProc1CgroupNotSystemd = []byte(`9:memory:/not/init.scope
1:name=not_systemd:/not.init.scope
`)
)
dir := os.TempDir()
@ -247,6 +250,17 @@ func TestIsContainerized(t *testing.T) {
t.Fatal("Wrongly assuming containerized for systemd /init.scope cgroup layout")
}
if err := ioutil.WriteFile(proc1Cgroup, nonContainerizedProc1CgroupNotSystemd, 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")
}
if err := ioutil.WriteFile(proc1Cgroup, containerizedProc1Cgroup, 0600); err != nil {
t.Fatalf("failed to write to %s: %v", proc1Cgroup, err)
}