Golang Executor.Start方法代码示例

func soExpectSuccessAndOutput(execEng executor.Executor, formula def.Formula, output string) {
	job := execEng.Start(formula, def.JobID(guid.New()), nil, ioutil.Discard)
	So(job, ShouldNotBeNil)
	So(job.Wait().Error, ShouldBeNil)
	So(job.Wait().ExitCode, ShouldEqual, 0)
	msg, err := ioutil.ReadAll(job.OutputReader())
	So(err, ShouldBeNil)
	So(string(msg), ShouldEqual, output)
}

func CheckPwdBehavior(execEng executor.Executor) {
	Convey("SPEC: Working directory should be contained", func() {
		formula := getBaseFormula()

		Convey("The default pwd should be the root", func() {
			// This test exists because of a peculularly terrifying fact about chroots:
			// If you spawn a new process with the chroot without setting its current working dir,
			// the cwd is still *whatever it inherits*.  And even if the process can't reach there
			// starting from "/", it can still *walk deeper from that cwd*.
			formula.Action = def.Action{
				//Entrypoint: []string{"find", "-maxdepth", "5"}, // if you goofed, during test runs this will show you the executor's workspace!
				//Entrypoint: []string{"bash", "-c", "find -maxdepth 5 ; echo --- ; echo \"$PWD\" ; cd \"$(echo \"$PWD\" | sed 's/^(unreachable)//')\" ; ls"}, // this demo's that you can't actually cd back to it, though.
				Entrypoint: []string{"pwd"},
			}

			soExpectSuccessAndOutput(execEng, formula,
				"/\n",
			)
		})

		Convey("Setting another cwd should work", func() {
			formula.Action = def.Action{
				Cwd:        "/usr",
				Entrypoint: []string{"pwd"},
			}

			soExpectSuccessAndOutput(execEng, formula,
				"/usr\n",
			)
		})

		Convey("Setting a nonexistent cwd should fail to launch", FailureContinues, func() {
			formula.Action = def.Action{
				Cwd:        "/does/not/exist/by/any/means",
				Entrypoint: []string{"pwd"},
			}

			job := execEng.Start(formula, def.JobID(guid.New()), nil, ioutil.Discard)
			So(job, ShouldNotBeNil)
			So(job.Wait().Error, ShouldNotBeNil)
			So(job.Wait().Error, testutil.ShouldBeErrorClass, executor.TaskExecError)
			So(job.Wait().ExitCode, ShouldEqual, -1)
			msg, err := ioutil.ReadAll(job.OutputReader())
			So(err, ShouldBeNil)
			So(string(msg), ShouldEqual, "")
		})
	})
}

func CheckFilesystemContainment(execEng executor.Executor) {
	Convey("SPEC: Launching with multiple inputs should work", func() {
		formula := getBaseFormula()

		Convey("Launch should succeed", func() {
			filefixture.Beta.Create("./fixture/beta")
			formula.Inputs = append(formula.Inputs, (def.Input{
				Name:       "2-input-test",
				Type:       "dir",
				Hash:       filefixture.Beta_Hash,
				Warehouses: []string{"./fixture/beta"},
				MountPath:  "/data/test",
			}))

			formula.Action = def.Action{
				Entrypoint: []string{"/bin/true"},
			}
			job := execEng.Start(formula, def.JobID(guid.New()), nil, ioutil.Discard)
			So(job, ShouldNotBeNil)
			So(job.Wait().Error, ShouldBeNil)
			So(job.Wait().ExitCode, ShouldEqual, 0)

			Convey("Commands inside the job should be able to see the mounted files", FailureContinues, func() {
				formula.Action = def.Action{
					Entrypoint: []string{"ls", "/data/test"},
				}

				job := execEng.Start(formula, def.JobID(guid.New()), nil, ioutil.Discard)
				So(job, ShouldNotBeNil)
				So(job.Wait().Error, ShouldBeNil)
				So(job.Wait().ExitCode, ShouldEqual, 0)
				msg, err := ioutil.ReadAll(job.OutputReader())
				So(err, ShouldBeNil)
				So(string(msg), ShouldEqual, "1\n2\n3\n")
			})
		})
	})
}

func CheckEnvBehavior(execEng executor.Executor) {
	// NOTE the chroot executor currently uses `def.ValidateAll` which effectively *does not permit you to have an empty $PATH var*.
	// we may decide to change that later -- but there's a correctness versus convenience battle there, and for now, we're going with convenience.

	Convey("SPEC: Env vars should be contained", func() {
		formula := getBaseFormula()
		formula.Action = def.Action{
			Entrypoint: []string{"env"},
		}

		Convey("Env from the parent should not be inherited", func() {
			os.Setenv("REPEATR_TEST_KEY_1", "test value")
			defer os.Unsetenv("REPEATR_TEST_KEY_1") // using unique strings per test anyway, because this is too scary

			job := execEng.Start(formula, def.JobID(guid.New()), nil, ioutil.Discard)
			So(job, ShouldNotBeNil)
			So(job.Wait().Error, ShouldBeNil)
			So(job.Wait().ExitCode, ShouldEqual, 0)
			msg, err := ioutil.ReadAll(job.OutputReader())
			So(err, ShouldBeNil)
			So(strings.Contains("REPEATR_TEST_KEY_1", string(msg)), ShouldBeFalse)
		})

		Convey("Env specified with the job should be applied", func() {
			formula.Action.Env = make(map[string]string)
			formula.Action.Env["REPEATR_TEST_KEY_2"] = "test value"

			job := execEng.Start(formula, def.JobID(guid.New()), nil, ioutil.Discard)
			So(job, ShouldNotBeNil)
			So(job.Wait().Error, ShouldBeNil)
			So(job.Wait().ExitCode, ShouldEqual, 0)
			msg, err := ioutil.ReadAll(job.OutputReader())
			So(err, ShouldBeNil)
			So(string(msg), ShouldContainSubstring, "REPEATR_TEST_KEY_2=test value")
		})

	})
}

/*
	Check the basics of exec:
	  - Does it work at all?
	  - Can we see error codes?
	  - Can we stream stdout?
	  - If there's no rootfs, does it panic?
	  - If the command's not found, does it panic?

	Anything that requires *more than the one rootfs input* or anything
	about outputs belongs in another part of the spec tests.

	If any of these fail, most other parts of the specs will also fail.
*/
func CheckBasicExecution(execEng executor.Executor) {
	Convey("SPEC: Attempting launch with a rootfs that doesn't exist should error", func() {
		formula := def.Formula{
			Inputs: []def.Input{
				{
					Type:     "tar",
					Location: "/",
					// Funny thing is, the URI isn't even necessarily where the buck stops;
					// Remote URIs need not be checked if caches are in play, etc.
					// So the hash needs to be set (and needs to be invalid).
					URI:  "file:///nonexistance/in/its/most/essential/unform.tar.gz",
					Hash: "defnot",
				},
			},
		}

		Convey("We should get an error from the warehouse", func() {
			result := execEng.Start(formula, def.JobID(guid.New()), nil, ioutil.Discard).Wait()
			So(result.Error, testutil.ShouldBeErrorClass, integrity.WarehouseError)
		})

		Convey("The job exit code should clearly indicate failure", FailureContinues, func() {
			formula.Accents = def.Accents{
				Entrypoint: []string{"echo", "echococo"},
			}
			job := execEng.Start(formula, def.JobID(guid.New()), nil, ioutil.Discard)
			So(job, ShouldNotBeNil)
			So(job.Wait().Error, ShouldNotBeNil)
			// Even though one should clearly also check the error status,
			//  zero here could be very confusing, so jobs that error before start should be -1.
			So(job.Wait().ExitCode, ShouldEqual, -1)
		})
	})

	Convey("SPEC: Launching a command with a working rootfs should work", func() {
		formula := getBaseFormula()

		Convey("The executor should be able to invoke echo", FailureContinues, func() {
			formula.Accents = def.Accents{
				Entrypoint: []string{"echo", "echococo"},
			}

			job := execEng.Start(formula, def.JobID(guid.New()), nil, ioutil.Discard)
			So(job, ShouldNotBeNil)
			// note that we can read output concurrently.
			// no need to wait for job done.
			msg, err := ioutil.ReadAll(job.OutputReader())
			So(err, ShouldBeNil)
			So(string(msg), ShouldEqual, "echococo\n")
			So(job.Wait().Error, ShouldBeNil)
			So(job.Wait().ExitCode, ShouldEqual, 0)
		})

		Convey("The executor should be able to check exit codes", func() {
			formula.Accents = def.Accents{
				Entrypoint: []string{"sh", "-c", "exit 14"},
			}

			job := execEng.Start(formula, def.JobID(guid.New()), nil, ioutil.Discard)
			So(job, ShouldNotBeNil)
			So(job.Wait().Error, ShouldBeNil)
			So(job.Wait().ExitCode, ShouldEqual, 14)
		})

		Convey("The executor should report command not found clearly", FailureContinues, func() {
			formula.Accents = def.Accents{
				Entrypoint: []string{"not a command"},
			}

			job := execEng.Start(formula, def.JobID(guid.New()), nil, ioutil.Discard)
			So(job.Wait().Error, testutil.ShouldBeErrorClass, executor.NoSuchCommandError)
			So(job.Wait().ExitCode, ShouldEqual, -1)
			msg, err := ioutil.ReadAll(job.OutputReader())
			So(err, ShouldBeNil)
			So(string(msg), ShouldEqual, "")
		})
	})
}