func (ms *mgrsSuite) TestHappyLocalInstall(c *C) {
	snapYamlContent := `name: foo
apps:
 bar:
  command: bin/bar
`
	snapPath := makeTestSnap(c, snapYamlContent+"version: 1.0")

	st := ms.o.State()
	st.Lock()
	defer st.Unlock()

	ts, err := snapstate.InstallPath(st, &snap.SideInfo{RealName: "foo"}, snapPath, "", snapstate.Flags{DevMode: true})
	c.Assert(err, IsNil)
	chg := st.NewChange("install-snap", "...")
	chg.AddAll(ts)

	st.Unlock()
	err = ms.o.Settle()
	st.Lock()
	c.Assert(err, IsNil)

	c.Assert(chg.Status(), Equals, state.DoneStatus, Commentf("install-snap change failed with: %v", chg.Err()))

	snap, err := snapstate.CurrentInfo(st, "foo")
	c.Assert(err, IsNil)

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

	// data dirs
	c.Assert(osutil.IsDirectory(snap.DataDir()), Equals, true)
	c.Assert(osutil.IsDirectory(snap.CommonDataDir()), Equals, true)

	// snap file and its mounting

	// after install the snap file is in the right dir
	c.Assert(osutil.FileExists(filepath.Join(dirs.SnapBlobDir, "foo_x1.snap")), Equals, true)

	// ensure the right unit is created
	mup := systemd.MountUnitPath("/snap/foo/x1")
	content, err := ioutil.ReadFile(mup)
	c.Assert(err, IsNil)
	c.Assert(string(content), Matches, "(?ms).*^Where=/snap/foo/x1")
	c.Assert(string(content), Matches, "(?ms).*^What=/var/lib/snapd/snaps/foo_x1.snap")

}

func (s *systemd) WriteMountUnitFile(name, what, where, fstype string) (string, error) {
	extra := ""
	if osutil.IsDirectory(what) {
		extra = "Options=bind\n"
		fstype = "none"
	}

	if fstype == "squashfs" && useFuse() {
		fstype = "fuse.squashfuse"
	}

	c := fmt.Sprintf(`[Unit]
Description=Mount unit for %s

[Mount]
What=%s
Where=%s
Type=%s
%s
[Install]
WantedBy=multi-user.target
`, name, what, where, fstype, extra)

	mu := MountUnitPath(where)
	return filepath.Base(mu), osutil.AtomicWriteFile(mu, []byte(c), 0644, 0)
}

func loadState(backend state.Backend) (*state.State, error) {
	if !osutil.FileExists(dirs.SnapStateFile) {
		// fail fast, mostly interesting for tests, this dir is setup
		// by the snapd package
		stateDir := filepath.Dir(dirs.SnapStateFile)
		if !osutil.IsDirectory(stateDir) {
			return nil, fmt.Errorf("fatal: directory %q must be present", stateDir)
		}
		s := state.New(backend)
		patch.Init(s)
		return s, nil
	}

	r, err := os.Open(dirs.SnapStateFile)
	if err != nil {
		return nil, fmt.Errorf("cannot read the state file: %s", err)
	}
	defer r.Close()

	s, err := state.ReadState(backend, r)
	if err != nil {
		return nil, err
	}

	// one-shot migrations
	err = patch.Apply(s)
	if err != nil {
		return nil, err
	}
	return s, nil
}

func trySnap(c *Command, r *http.Request, user *auth.UserState, trydir string, flags snapstate.Flags) Response {
	st := c.d.overlord.State()
	st.Lock()
	defer st.Unlock()

	if !filepath.IsAbs(trydir) {
		return BadRequest("cannot try %q: need an absolute path", trydir)
	}
	if !osutil.IsDirectory(trydir) {
		return BadRequest("cannot try %q: not a snap directory", trydir)
	}

	// the developer asked us to do this with a trusted snap dir
	info, err := unsafeReadSnapInfo(trydir)
	if err != nil {
		return BadRequest("cannot read snap info for %s: %s", trydir, err)
	}

	tsets, err := snapstateTryPath(st, info.Name(), trydir, flags)
	if err != nil {
		return BadRequest("cannot try %s: %s", trydir, err)
	}

	msg := fmt.Sprintf(i18n.G("Try %q snap from %q"), info.Name(), trydir)
	chg := newChange(st, "try-snap", msg, []*state.TaskSet{tsets}, []string{info.Name()})
	chg.Set("api-data", map[string]string{"snap-name": info.Name()})

	ensureStateSoon(st)

	return AsyncResponse(nil, &Meta{Change: chg.ID()})
}

func norm(path string) string {
	path = filepath.Clean(path)
	if osutil.IsDirectory(path) {
		path = path + "/"
	}

	return path
}

// addImplicitHooks adds hooks from the installed snap's hookdir to the snap info.
//
// Existing hooks (i.e. ones defined in the YAML) are not changed; only missing
// hooks are added.
func addImplicitHooks(snapInfo *Info) error {
	// First of all, check to ensure the hooks directory exists. If it doesn't,
	// it's not an error-- there's just nothing to do.
	hooksDir := snapInfo.HooksDir()
	if !osutil.IsDirectory(hooksDir) {
		return nil
	}

	fileInfos, err := ioutil.ReadDir(hooksDir)
	if err != nil {
		return fmt.Errorf("unable to read hooks directory: %s", err)
	}

	for _, fileInfo := range fileInfos {
		addHookIfValid(snapInfo, fileInfo.Name())
	}

	return nil
}

func (x *cmdTry) Execute([]string) error {
	if err := x.validateMode(); err != nil {
		return err
	}
	cli := Client()
	name := x.Positional.SnapDir
	opts := &client.SnapOptions{
		DevMode:  x.DevMode,
		JailMode: x.JailMode,
	}

	if name == "" {
		if osutil.FileExists("snapcraft.yaml") && osutil.IsDirectory("prime") {
			name = "prime"
		} else {
			if osutil.FileExists("meta/snap.yaml") {
				name = "./"
			}
		}
		if name == "" {
			return fmt.Errorf(i18n.G("error: the `<snap-dir>` argument was not provided and couldn't be inferred"))
		}
	}

	path, err := filepath.Abs(name)
	if err != nil {
		// TRANSLATORS: %q gets what the user entered, %v gets the resulting error message
		return fmt.Errorf(i18n.G("cannot get full path for %q: %v"), name, err)
	}

	changeID, err := cli.Try(path, opts)
	if err != nil {
		return err
	}

	chg, err := wait(cli, changeID)
	if err != nil {
		return err
	}

	// extract the snap name
	var snapName string
	if err := chg.Get("snap-name", &snapName); err != nil {
		// TRANSLATORS: %q gets the snap name, %v gets the resulting error message
		return fmt.Errorf(i18n.G("cannot extract the snap-name from local file %q: %v"), name, err)
	}
	name = snapName

	// show output as speced
	snaps, err := cli.List([]string{name}, nil)
	if err != nil {
		return err
	}
	if len(snaps) != 1 {
		// TRANSLATORS: %q gets the snap name, %v the list of things found when trying to list it
		return fmt.Errorf(i18n.G("cannot get data for %q: %v"), name, snaps)
	}
	snap := snaps[0]
	// TRANSLATORS: 1. snap name, 2. snap version (keep those together please). the 3rd %s is a path (where it's mounted from).
	fmt.Fprintf(Stdout, i18n.G("%s %s mounted from %s\n"), name, snap.Version, path)
	return nil
}

func (ms *mgrsSuite) TestHappyLocalInstallWithStoreMetadata(c *C) {
	snapDecl := ms.prereqSnapAssertions(c)

	snapYamlContent := `name: foo
apps:
 bar:
  command: bin/bar
`
	snapPath := makeTestSnap(c, snapYamlContent+"version: 1.5")

	si := &snap.SideInfo{
		RealName:    "foo",
		SnapID:      fooSnapID,
		Revision:    snap.R(55),
		DeveloperID: "devdevdevID",
		Developer:   "devdevdev",
	}

	st := ms.o.State()
	st.Lock()
	defer st.Unlock()

	// have the snap-declaration in the system db
	err := assertstate.Add(st, ms.storeSigning.StoreAccountKey(""))
	c.Assert(err, IsNil)
	err = assertstate.Add(st, ms.devAcct)
	c.Assert(err, IsNil)
	err = assertstate.Add(st, snapDecl)
	c.Assert(err, IsNil)

	ts, err := snapstate.InstallPath(st, si, snapPath, "", snapstate.Flags{DevMode: true})
	c.Assert(err, IsNil)
	chg := st.NewChange("install-snap", "...")
	chg.AddAll(ts)

	st.Unlock()
	err = ms.o.Settle()
	st.Lock()
	c.Assert(err, IsNil)

	c.Assert(chg.Status(), Equals, state.DoneStatus, Commentf("install-snap change failed with: %v", chg.Err()))

	info, err := snapstate.CurrentInfo(st, "foo")
	c.Assert(err, IsNil)
	c.Check(info.Revision, Equals, snap.R(55))
	c.Check(info.SnapID, Equals, fooSnapID)
	c.Check(info.DeveloperID, Equals, "devdevdevID")
	c.Check(info.Developer, Equals, "devdevdev")
	c.Check(info.Version, Equals, "1.5")

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

	// data dirs
	c.Assert(osutil.IsDirectory(info.DataDir()), Equals, true)
	c.Assert(osutil.IsDirectory(info.CommonDataDir()), Equals, true)

	// snap file and its mounting

	// after install the snap file is in the right dir
	c.Assert(osutil.FileExists(filepath.Join(dirs.SnapBlobDir, "foo_55.snap")), Equals, true)

	// ensure the right unit is created
	mup := systemd.MountUnitPath("/snap/foo/55")
	content, err := ioutil.ReadFile(mup)
	c.Assert(err, IsNil)
	c.Assert(string(content), Matches, "(?ms).*^Where=/snap/foo/55")
	c.Assert(string(content), Matches, "(?ms).*^What=/var/lib/snapd/snaps/foo_55.snap")
}