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/*
* fscrypt.go - File which starts up and runs the application. Initializes
* information about the application like the name, version, author, etc...
*
* Copyright 2017 Google Inc.
* Author: Joe Richey (joerichey@google.com)
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
/*
fscrypt is a comprehensive command line tool for managing filesystem encryption.
*/
package main
import (
"fmt"
"io/ioutil"
"log"
"os"
"time"
"github.com/urfave/cli"
)
var (
// Current version of the program (set by Makefile)
version string
// Formatted build time (set by Makefile)
buildTime string
// Authors to display in the info command
Authors = []cli.Author{{
Name: "Joe Richey",
Email: "joerichey@google.com",
}}
)
func main() {
cli.AppHelpTemplate = appHelpTemplate
cli.CommandHelpTemplate = commandHelpTemplate
cli.SubcommandHelpTemplate = subcommandHelpTemplate
// Create our command line application
app := cli.NewApp()
app.Usage = shortUsage
app.Authors = Authors
app.Copyright = apache2GoogleCopyright
// Grab the version and compilation time passed in from the Makefile.
app.Version = version
app.Compiled, _ = time.Parse(time.UnixDate, buildTime)
app.OnUsageError = onUsageError
// Setup global flags
cli.HelpFlag = helpFlag
cli.VersionFlag = versionFlag
cli.VersionPrinter = func(c *cli.Context) {
cli.HelpPrinter(c.App.Writer, versionInfoTemplate, c.App)
}
app.Flags = universalFlags
// We hide the help subcommand so that "fscrypt <command> --help" works
// and "fscrypt <command> help" does not.
app.HideHelp = true
// Initialize command list and setup all of the commands.
app.Action = defaultAction
app.Commands = []cli.Command{Setup, Encrypt, Unlock}
for i := range app.Commands {
setupCommand(&app.Commands[i])
}
app.Run(os.Args)
}
// setupCommand performs some common setup for each command. This includes
// hiding the help, formating the description, adding in the necessary
// flags, setting up error handlers, etc... Note that the command is modified
// in place and its subcommands are also setup.
func setupCommand(command *cli.Command) {
command.Description = wrapText(command.Description, indentLength)
command.HideHelp = true
command.Flags = append(command.Flags, universalFlags...)
if command.Action == nil {
command.Action = defaultAction
}
// Setup function handlers
command.OnUsageError = onUsageError
if len(command.Subcommands) == 0 {
command.Before = setupOutputs
} else {
// Cleanup subcommands (if applicable)
for i := range command.Subcommands {
setupCommand(&command.Subcommands[i])
}
}
}
// setupOutputs makes sure our logs, errors, and output are going to the correct
// io.Writers and that we haven't over-specified our flags. We only print the
// logs when using verbose, and only print normal stuff when not using quiet.
func setupOutputs(c *cli.Context) error {
log.SetOutput(ioutil.Discard)
c.App.Writer = ioutil.Discard
if verboseFlag.Value {
log.SetOutput(os.Stdout)
}
if !quietFlag.Value {
c.App.Writer = os.Stdout
}
return nil
}
// defaultAction will be run when no command is specified.
func defaultAction(c *cli.Context) error {
// Always default to showing the help
if helpFlag.Value {
cli.ShowAppHelp(c)
return nil
}
// Only exit when not calling with the help command
var message string
if args := c.Args(); args.Present() {
message = fmt.Sprintf("command \"%s\" not found", args.First())
} else {
message = "no command was specified"
}
return &usageError{c, message}
}
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