117 lines
2.8 KiB
Go
117 lines
2.8 KiB
Go
package executor
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import (
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"io/ioutil"
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"log"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"testing"
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"github.com/hashicorp/nomad/client/driver/env"
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cstructs "github.com/hashicorp/nomad/client/driver/structs"
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"github.com/hashicorp/nomad/client/testutil"
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"github.com/hashicorp/nomad/nomad/mock"
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)
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func testExecutorContextWithChroot(t *testing.T) *ExecutorContext {
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taskEnv := env.NewTaskEnvironment(mock.Node())
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task, allocDir := mockAllocDir(t)
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ctx := &ExecutorContext{
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TaskEnv: taskEnv,
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Task: task,
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AllocDir: allocDir,
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ChrootEnv: map[string]string{
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"/etc/ld.so.cache": "/etc/ld.so.cache",
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"/etc/ld.so.conf": "/etc/ld.so.conf",
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"/etc/ld.so.conf.d": "/etc/ld.so.conf.d",
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"/lib": "/lib",
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"/lib64": "/lib64",
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"/usr/lib": "/usr/lib",
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"/bin/ls": "/bin/ls",
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"/foobar": "/does/not/exist",
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},
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}
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return ctx
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}
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func TestExecutor_IsolationAndConstraints(t *testing.T) {
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testutil.ExecCompatible(t)
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execCmd := ExecCommand{Cmd: "/bin/ls", Args: []string{"-F", "/", "/etc/"}}
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ctx := testExecutorContextWithChroot(t)
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defer ctx.AllocDir.Destroy()
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execCmd.FSIsolation = true
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execCmd.ResourceLimits = true
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execCmd.User = cstructs.DefaultUnpriviledgedUser
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executor := NewExecutor(log.New(os.Stdout, "", log.LstdFlags))
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if err := executor.SetContext(ctx); err != nil {
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t.Fatalf("Unexpected error")
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}
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ps, err := executor.LaunchCmd(&execCmd)
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if err != nil {
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t.Fatalf("error in launching command: %v", err)
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}
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if ps.Pid == 0 {
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t.Fatalf("expected process to start and have non zero pid")
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}
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_, err = executor.Wait()
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if err != nil {
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t.Fatalf("error in waiting for command: %v", err)
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}
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// Check if the resource contraints were applied
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memLimits := filepath.Join(ps.IsolationConfig.CgroupPaths["memory"], "memory.limit_in_bytes")
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data, err := ioutil.ReadFile(memLimits)
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if err != nil {
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t.Fatalf("err: %v", err)
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}
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expectedMemLim := strconv.Itoa(ctx.Task.Resources.MemoryMB * 1024 * 1024)
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actualMemLim := strings.TrimSpace(string(data))
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if actualMemLim != expectedMemLim {
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t.Fatalf("actual mem limit: %v, expected: %v", string(data), expectedMemLim)
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}
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if err := executor.Exit(); err != nil {
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t.Fatalf("error: %v", err)
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}
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// Check if Nomad has actually removed the cgroups
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if _, err := os.Stat(memLimits); err == nil {
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t.Fatalf("file %v hasn't been removed", memLimits)
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}
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expected := `/:
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alloc/
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bin/
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dev/
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etc/
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lib/
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lib64/
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local/
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proc/
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secrets/
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tmp/
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usr/
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/etc/:
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ld.so.cache
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ld.so.conf
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ld.so.conf.d/`
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file := filepath.Join(ctx.AllocDir.LogDir(), "web.stdout.0")
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output, err := ioutil.ReadFile(file)
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if err != nil {
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t.Fatalf("Couldn't read file %v", file)
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}
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act := strings.TrimSpace(string(output))
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if act != expected {
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t.Fatalf("Command output incorrectly: want %v; got %v", expected, act)
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}
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}
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