forked from keybase/client
/
cmd_simplefs_read.go
121 lines (102 loc) · 2.58 KB
/
cmd_simplefs_read.go
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// Copyright 2015 Keybase, Inc. All rights reserved. Use of
// this source code is governed by the included BSD license.
package client
import (
"fmt"
"golang.org/x/net/context"
"github.com/keybase/cli"
"github.com/keybase/client/go/libcmdline"
"github.com/keybase/client/go/libkb"
keybase1 "github.com/keybase/client/go/protocol/keybase1"
)
const readBufSizeDefault = 1600
// CmdSimpleFSRead is the 'fs read' command.
type CmdSimpleFSRead struct {
libkb.Contextified
path keybase1.Path
bufSize int
}
// NewCmdSimpleFSRead creates a new cli.Command.
func NewCmdSimpleFSRead(cl *libcmdline.CommandLine, g *libkb.GlobalContext) cli.Command {
return cli.Command{
Name: "read",
ArgumentHelp: "<path>",
Usage: "output file contents to standard output",
Action: func(c *cli.Context) {
cl.ChooseCommand(&CmdSimpleFSRead{Contextified: libkb.NewContextified(g)}, "read", c)
cl.SetNoStandalone()
},
Flags: []cli.Flag{
cli.IntFlag{
Name: "b, buffersize",
Value: readBufSizeDefault,
Usage: "read buffer size",
},
},
}
}
// Run runs the command in client/server mode.
func (c *CmdSimpleFSRead) Run() error {
cli, err := GetSimpleFSClient(c.G())
if err != nil {
return err
}
ctx := context.TODO()
opid, err2 := cli.SimpleFSMakeOpid(ctx)
if err2 != nil {
return err2
}
err = cli.SimpleFSOpen(ctx, keybase1.SimpleFSOpenArg{
OpID: opid,
Dest: c.path,
Flags: keybase1.OpenFlags_READ | keybase1.OpenFlags_EXISTING,
})
if err != nil {
return err
}
defer cli.SimpleFSClose(ctx, opid)
var offset int64
for {
c.G().Log.Debug("SimpleFS: Reading at %d", offset)
content, err := cli.SimpleFSRead(ctx, keybase1.SimpleFSReadArg{
OpID: opid,
Offset: offset,
Size: c.bufSize,
})
if err != nil {
return err
}
c.G().Log.Debug("SimpleFS: Read %d", len(content.Data))
if len(content.Data) > 0 {
offset += int64(len(content.Data))
c.output(content.Data)
} else {
break
}
}
return err
}
func (c *CmdSimpleFSRead) output(data []byte) {
ui := c.G().UI.GetTerminalUI()
ui.OutputWriter().Write(data)
}
// ParseArgv does nothing for this command.
func (c *CmdSimpleFSRead) ParseArgv(ctx *cli.Context) error {
nargs := len(ctx.Args())
var err error
c.bufSize = ctx.Int("buffersize")
if nargs == 1 {
c.path = makeSimpleFSPath(c.G(), ctx.Args()[0])
} else {
err = fmt.Errorf("read requires a path argument")
}
return err
}
// GetUsage says what this command needs to operate.
func (c *CmdSimpleFSRead) GetUsage() libkb.Usage {
return libkb.Usage{
Config: true,
KbKeyring: true,
API: true,
}
}