Golang osutil.FileExists函数代码示例

func (s *SnapTestSuite) TestSnappyHandleServicesOnInstall(c *C) {
	snapYamlContent := `name: foo
apps:
 service:
   command: bin/hello
   daemon: forking
`
	si := &snap.SideInfo{
		OfficialName: "foo",
		Revision:     32,
	}

	snapPath := makeTestSnapPackage(c, snapYamlContent+"version: 1.0")
	// revision will be 0
	_, err := (&Overlord{}).InstallWithSideInfo(snapPath, si, AllowUnauthenticated, nil)
	c.Assert(err, IsNil)

	servicesFile := filepath.Join(dirs.SnapServicesDir, "snap.foo.service.service")
	c.Assert(osutil.FileExists(servicesFile), Equals, true)
	st, err := os.Stat(servicesFile)
	c.Assert(err, IsNil)
	// should _not_ be executable
	c.Assert(st.Mode().String(), Equals, "-rw-r--r--")

	// and that it gets removed on remove
	snapDir := filepath.Join(dirs.SnapSnapsDir, "foo", "32")
	yamlPath := filepath.Join(snapDir, "meta", "snap.yaml")
	snap, err := NewInstalledSnap(yamlPath)
	c.Assert(err, IsNil)
	err = (&Overlord{}).Uninstall(snap, &MockProgressMeter{})
	c.Assert(err, IsNil)
	c.Assert(osutil.FileExists(servicesFile), Equals, false)
	c.Assert(osutil.FileExists(snapDir), Equals, false)
}

func (s *SnapTestSuite) TestSnappyHandleBinariesOnInstall(c *C) {
	snapYamlContent := `name: foo
apps:
 bar:
  command: bin/bar
`
	snapPath := makeTestSnapPackage(c, snapYamlContent+"version: 1.0")
	// revision will be 0
	_, err := (&Overlord{}).Install(snapPath, AllowUnauthenticated, nil)
	c.Assert(err, IsNil)

	// ensure that the binary wrapper file go generated with the right
	// name
	binaryWrapper := filepath.Join(dirs.SnapBinariesDir, "foo.bar")
	c.Assert(osutil.FileExists(binaryWrapper), Equals, true)

	// and that it gets removed on remove
	snapDir := filepath.Join(dirs.SnapSnapsDir, "foo", "0")
	yamlPath := filepath.Join(snapDir, "meta", "snap.yaml")
	snap, err := NewInstalledSnap(yamlPath)
	c.Assert(err, IsNil)
	err = (&Overlord{}).Uninstall(snap, &MockProgressMeter{})
	c.Assert(err, IsNil)
	c.Assert(osutil.FileExists(binaryWrapper), Equals, false)
	c.Assert(osutil.FileExists(snapDir), Equals, false)
}

func (s *GadgetSuite) TestCleanupGadgetHardwareRules(c *C) {
	info, err := snap.InfoFromSnapYaml(hardwareYaml)
	c.Assert(err, IsNil)

	err = writeApparmorAdditionalFile(info)
	c.Assert(err, IsNil)

	additionalFile := filepath.Join(dirs.SnapAppArmorDir, "device-hive-iot-hal.json.additional")
	c.Assert(osutil.FileExists(additionalFile), Equals, true)

	err = cleanupGadgetHardwareUdevRules(info)
	c.Assert(err, IsNil)
	c.Assert(osutil.FileExists(additionalFile), Equals, false)
}

func populateStateFromInstalled() error {
	all, err := (&snappy.Overlord{}).Installed()
	if err != nil {
		return err
	}

	if osutil.FileExists(dirs.SnapStateFile) {
		return fmt.Errorf("cannot create state: state %q already exists", dirs.SnapStateFile)
	}

	st := state.New(&overlordStateBackend{
		path: dirs.SnapStateFile,
	})
	st.Lock()
	defer st.Unlock()

	for _, sn := range all {
		// no need to do a snapstate.Get() because this is firstboot
		info := sn.Info()

		var snapst snapstate.SnapState
		snapst.Sequence = append(snapst.Sequence, &info.SideInfo)
		snapst.Channel = info.Channel
		snapst.Active = sn.IsActive()
		snapstate.Set(st, sn.Name(), &snapst)
	}

	return nil
}

func (s *SnapTestSuite) TestDesktopFileIsAddedAndRemoved(c *C) {
	yamlFile, err := makeInstalledMockSnap(string(desktopAppYaml), 11)
	c.Assert(err, IsNil)
	snap, err := NewInstalledSnap(yamlFile)
	c.Assert(err, IsNil)

	// create a mock desktop file
	err = os.MkdirAll(filepath.Join(filepath.Dir(yamlFile), "gui"), 0755)
	c.Assert(err, IsNil)
	err = ioutil.WriteFile(filepath.Join(filepath.Dir(yamlFile), "gui", "foobar.desktop"), []byte(mockDesktopFile), 0644)
	c.Assert(err, IsNil)

	// ensure that activate creates the desktop file
	err = ActivateSnap(snap, nil)
	c.Assert(err, IsNil)

	mockDesktopFilePath := filepath.Join(dirs.SnapDesktopFilesDir, "foo_foobar.desktop")
	content, err := ioutil.ReadFile(mockDesktopFilePath)
	c.Assert(err, IsNil)
	c.Assert(string(content), Equals, `
[Desktop Entry]
Name=foo
Icon=/snap/foo/11/foo.png`)

	// unlink (deactivate) removes it again
	err = UnlinkSnap(snap.Info(), nil)
	c.Assert(err, IsNil)
	c.Assert(osutil.FileExists(mockDesktopFilePath), Equals, false)
}

func (dbs *databaseSuite) TestGenerateKey(c *C) {
	fingerp, err := dbs.db.GenerateKey("account0")
	c.Assert(err, IsNil)
	c.Check(fingerp, NotNil)
	keyPath := filepath.Join(dbs.topDir, "private-keys-v0/account0", fingerp)
	c.Check(osutil.FileExists(keyPath), Equals, true)
}

func UndoSetupSnap(s snap.PlaceInfo, meter progress.Meter) {
	// SetupSnap did it not made far enough
	if !osutil.FileExists(s.MountDir()) {
		return
	}

	if err := RemoveSnapFiles(s, meter); err != nil {
		logger.Noticef("cannot remove snap files: %s", err)
	}

	mountDir := s.MountDir()
	snapPath := s.MountFile()

	// remove install dir and the snap blob itself
	for _, path := range []string{
		mountDir,
		snapPath,
	} {
		if err := os.RemoveAll(path); err != nil {
			logger.Noticef("cannot remove snap package at %v: %s", mountDir, err)
		}
	}

	// FIXME: do we need to undo installGadgetHardwareUdevRules via
	//        cleanupGadgetHardwareUdevRules ? it will go away
	//        and can only be used during install right now
}

// InDeveloperMode returns true if the image was build with --developer-mode
func InDeveloperMode() bool {
	// FIXME: this is a bit terrible, we really need a single
	//        bootloader dir like /boot or /boot/loader
	//        instead of having to query the partition code
	bootloader, err := findBootloader()
	if err != nil {
		// can only happy on systems like ubuntu classic
		// that are not full snappy systems
		return false
	}

	file := filepath.Join(bootloader.Dir(), InstallYamlFile)
	if !osutil.FileExists(file) {
		// no idea
		return false
	}

	InstallYaml, err := parseInstallYaml(file)
	if err != nil {
		// no idea
		return false
	}

	return InstallYaml.InstallOptions.DeveloperMode
}

func (s *SquashfsTestSuite) TestInstallFailUnmountsSnap(c *C) {
	c.Skip("no easy path to this kind of late verification failure now!")
	snapPkg := makeTestSnapPackage(c, `name: hello
version: 1.10
apps:
 some-binary:
  command: some-binary
  plugs: [some-binary]

plugs:
 some-binary:
  interface: old-security
  security-template: not-there
`)
	// install but our missing security-template will break the install
	// revision will be 0
	_, err := (&Overlord{}).Install(snapPkg, 0, &MockProgressMeter{})
	c.Assert(err, ErrorMatches, "could not find specified template: not-there.*")

	// ensure the mount unit is not there
	mup := systemd.MountUnitPath("/snap/hello/1.10", "mount")
	c.Assert(osutil.FileExists(mup), Equals, false)

	// ensure that the mount gets unmounted and stopped
	c.Assert(s.systemdCmds, DeepEquals, [][]string{
		{"start", "snap-hello-0.mount"},
		{"--root", dirs.GlobalRootDir, "disable", "snap-hello-0.mount"},
		{"stop", "snap-hello-0.mount"},
		{"show", "--property=ActiveState", "snap-hello-0.mount"},
	})
}

// newUboot create a new Uboot bootloader object
func newUboot() Bootloader {
	u := &uboot{}
	if !osutil.FileExists(u.envFile()) {
		return nil
	}

	return u
}

func (t *CreateTestSuite) TestCreateFailDestroys(c *C) {
	t.makeMockLxdServer(c)
	t.imageReader = strings.NewReader("its all broken")

	err := Create(&progress.NullProgress{})
	c.Assert(err, ErrorMatches, `(?m)failed to unpack .*`)
	c.Assert(osutil.FileExists(dirs.ClassicDir), Equals, false)
}

// Release returns the release of the current snappy image
func Release(c *check.C) string {
	// FIXME: use `snap info` once it is available again
	if osutil.FileExists(snappyCmd) {
		return "15.04"
	}

	return "rolling"
}

// newGrub create a new Grub bootloader object
func newGrub() Bootloader {
	g := &grub{}
	if !osutil.FileExists(g.configFile()) {
		return nil
	}

	return g
}

func (s *SnapTestSuite) TestWriteHardwareUdevEtc(c *C) {
	info, err := snap.InfoFromSnapYaml(hardwareYaml)
	c.Assert(err, IsNil)

	dirs.SnapUdevRulesDir = c.MkDir()
	writeGadgetHardwareUdevRules(info)

	c.Assert(osutil.FileExists(filepath.Join(dirs.SnapUdevRulesDir, "80-snappy_gadget-foo_device-hive-iot-hal.rules")), Equals, true)
}

func getTrustedAccountKey() string {
	if !osutil.FileExists(dirs.SnapTrustedAccountKey) {
		// XXX: allow this fallback here for integration tests,
		// until we have a proper trusted public key shared
		// with the store and decide possibly for a different strategy
		return os.Getenv("SNAPPY_TRUSTED_ACCOUNT_KEY")
	}
	return dirs.SnapTrustedAccountKey
}