github.com/olivere/camlistore@v0.0.0-20140121221811-1b7ac2da0199/dev/devcam/cammount.go (about)

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