1/*
2Copyright 2013 The Perkeep Authors.
3
4Licensed under the Apache License, Version 2.0 (the "License");
5you may not use this file except in compliance with the License.
6You may obtain a copy of the License at
7
8     http://www.apache.org/licenses/LICENSE-2.0
9
10Unless required by applicable law or agreed to in writing, software
11distributed under the License is distributed on an "AS IS" BASIS,
12WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13See the License for the specific language governing permissions and
14limitations under the License.
15*/
16
17// This file adds the "mount" subcommand to devcam, to run pk-mount against the dev server.
18
19package main
20
21import (
22	"flag"
23	"fmt"
24	"os"
25	"os/exec"
26	"path/filepath"
27	"runtime"
28	"strconv"
29	"strings"
30
31	"perkeep.org/internal/osutil"
32	"perkeep.org/pkg/cmdmain"
33)
34
35type mountCmd struct {
36	// start of flag vars
37	altkey bool
38	path   string
39	port   string
40	tls    bool
41	debug  bool
42	// end of flag vars
43
44	env *Env
45}
46
47const mountpoint = "/tmp/pk-mount-dir"
48
49func init() {
50	cmdmain.RegisterMode("mount", func(flags *flag.FlagSet) cmdmain.CommandRunner {
51		cmd := &mountCmd{
52			env: NewCopyEnv(),
53		}
54		flags.BoolVar(&cmd.altkey, "altkey", false, "Use different gpg key and password from the server's.")
55		flags.BoolVar(&cmd.tls, "tls", false, "Use TLS.")
56		flags.StringVar(&cmd.path, "path", "/", "Optional URL prefix path.")
57		flags.StringVar(&cmd.port, "port", "3179", "Port perkeep is listening on.")
58		flags.BoolVar(&cmd.debug, "debug", false, "print debugging messages.")
59		return cmd
60	})
61}
62
63func (c *mountCmd) Usage() {
64	fmt.Fprintf(cmdmain.Stderr, "Usage: devcam mount [mount_opts] [<root-blobref>|<share URL>]\n")
65}
66
67func (c *mountCmd) Examples() []string {
68	return []string{
69		"",
70		"http://localhost:3169/share/<blobref>",
71	}
72}
73
74func (c *mountCmd) Describe() string {
75	return "run pk-mount in dev mode."
76}
77
78func tryUnmount(dir string) error {
79	if runtime.GOOS == "darwin" {
80		return exec.Command("diskutil", "umount", "force", dir).Run()
81	}
82	return exec.Command("fusermount", "-u", dir).Run()
83}
84
85func (c *mountCmd) RunCommand(args []string) error {
86	err := c.checkFlags(args)
87	if err != nil {
88		return cmdmain.UsageError(fmt.Sprint(err))
89	}
90	if !*noBuild {
91		if err := build(filepath.Join("cmd", "pk-mount")); err != nil {
92			return fmt.Errorf("Could not build pk-mount: %v", err)
93		}
94	}
95	c.env.SetCamdevVars(c.altkey)
96	// wipeCacheDir needs to be called after SetCamdevVars, because that is
97	// where CAMLI_CACHE_DIR is defined.
98	if *wipeCache {
99		c.env.wipeCacheDir()
100	}
101
102	tryUnmount(mountpoint)
103	if err := os.Mkdir(mountpoint, 0700); err != nil && !os.IsExist(err) {
104		return fmt.Errorf("Could not make mount point: %v", err)
105	}
106
107	blobserver := "http://localhost:" + c.port + c.path
108	if c.tls {
109		blobserver = strings.Replace(blobserver, "http://", "https://", 1)
110	}
111
112	cmdBin, err := osutil.LookPathGopath("pk-mount")
113	if err != nil {
114		return err
115	}
116	cmdArgs := []string{
117		"-debug=" + strconv.FormatBool(c.debug),
118		"-server=" + blobserver,
119	}
120	cmdArgs = append(cmdArgs, args...)
121	cmdArgs = append(cmdArgs, mountpoint)
122	fmt.Printf("pk-mount running with mountpoint %v. Press 'q' <enter> or ctrl-c to shut down.\n", mountpoint)
123	return runExec(cmdBin, cmdArgs, c.env)
124}
125
126func (c *mountCmd) checkFlags(args []string) error {
127	if _, err := strconv.ParseInt(c.port, 0, 0); err != nil {
128		return fmt.Errorf("Invalid -port value: %q", c.port)
129	}
130	return nil
131}
132