blob: 7067e799fbeda24eb98565d5e46559c07590f170 [file] [log] [blame]
// +build linux
/*
Utility for testing cgroup operations.
Creates a mock of the cgroup filesystem for the duration of the test.
*/
package fs
import (
"io/ioutil"
"os"
"path/filepath"
"testing"
"github.com/opencontainers/runc/libcontainer/configs"
)
type cgroupTestUtil struct {
// cgroup data to use in tests.
CgroupData *cgroupData
// Path to the mock cgroup directory.
CgroupPath string
// Temporary directory to store mock cgroup filesystem.
tempDir string
t *testing.T
}
// Creates a new test util for the specified subsystem
func NewCgroupTestUtil(subsystem string, t *testing.T) *cgroupTestUtil {
d := &cgroupData{
config: &configs.Cgroup{},
}
d.config.Resources = &configs.Resources{}
tempDir, err := ioutil.TempDir("", "cgroup_test")
if err != nil {
t.Fatal(err)
}
d.root = tempDir
testCgroupPath := filepath.Join(d.root, subsystem)
if err != nil {
t.Fatal(err)
}
// Ensure the full mock cgroup path exists.
err = os.MkdirAll(testCgroupPath, 0755)
if err != nil {
t.Fatal(err)
}
return &cgroupTestUtil{CgroupData: d, CgroupPath: testCgroupPath, tempDir: tempDir, t: t}
}
func (c *cgroupTestUtil) cleanup() {
os.RemoveAll(c.tempDir)
}
// Write the specified contents on the mock of the specified cgroup files.
func (c *cgroupTestUtil) writeFileContents(fileContents map[string]string) {
for file, contents := range fileContents {
err := writeFile(c.CgroupPath, file, contents)
if err != nil {
c.t.Fatal(err)
}
}
}