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write.go
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write.go
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// Copyright 2016 Keybase Inc. All rights reserved.
// Use of this source code is governed by a BSD
// license that can be found in the LICENSE file.
package main
import (
"flag"
"fmt"
"io"
"os"
"github.com/adamwalz/keybase-client/go/kbfs/fsrpc"
"github.com/adamwalz/keybase-client/go/kbfs/idutil"
"github.com/adamwalz/keybase-client/go/kbfs/libkbfs"
"golang.org/x/net/context"
)
type nodeWriter struct {
ctx context.Context
kbfsOps libkbfs.KBFSOps
node libkbfs.Node
off int64
verbose bool
}
var _ io.Writer = (*nodeWriter)(nil)
func (nw *nodeWriter) Write(p []byte) (n int, err error) {
if nw.verbose {
fmt.Fprintf(os.Stderr, "Writing %s at offset %d\n", byteCountStr(len(p)), nw.off)
}
err = nw.kbfsOps.Write(nw.ctx, nw.node, p, nw.off)
if err == nil {
n = len(p)
nw.off += int64(n)
}
return
}
func writeHelper(ctx context.Context, config libkbfs.Config, args []string) (err error) {
flags := flag.NewFlagSet("kbfs write", flag.ContinueOnError)
append := flags.Bool("a", false, "Append to an existing file instead of truncating it.")
verbose := flags.Bool("v", false, "Print extra status output.")
err = flags.Parse(args)
if err != nil {
return err
}
if flags.NArg() != 1 {
return errExactlyOnePath
}
filePathStr := flags.Arg(0)
defer func() {
if err != nil {
if _, ok := err.(cannotWriteErr); !ok {
err = cannotWriteErr{filePathStr, err}
}
}
}()
p, err := fsrpc.NewPath(filePathStr)
if err != nil {
return
}
if p.PathType != fsrpc.TLFPathType {
err = cannotWriteErr{filePathStr, nil}
return
}
dir, filename, err := p.DirAndBasename()
if err != nil {
return
}
if dir.PathType != fsrpc.TLFPathType {
err = cannotWriteErr{filePathStr, nil}
return
}
parentNode, err := dir.GetDirNode(ctx, config)
if err != nil {
return err
}
kbfsOps := config.KBFSOps()
noSuchFileErr := idutil.NoSuchNameError{Name: filename}
// The operations below are racy, but that is inherent to a
// distributed FS.
filenamePPS := parentNode.ChildName(filename)
fileNode, de, err := kbfsOps.Lookup(ctx, parentNode, filenamePPS)
if err != nil && err != noSuchFileErr {
return err
}
needSync := false
var off int64
if err == noSuchFileErr {
if *verbose {
fmt.Fprintf(os.Stderr, "Creating %s\n", p)
}
fileNode, _, err = kbfsOps.CreateFile(
ctx, parentNode, filenamePPS, false, libkbfs.NoExcl)
if err != nil {
return err
}
} else {
if *append {
if *verbose {
fmt.Fprintf(os.Stderr, "Appending to %s\n", p)
}
off = int64(de.Size)
} else {
if *verbose {
fmt.Fprintf(os.Stderr, "Truncating %s\n", p)
}
err = kbfsOps.Truncate(ctx, fileNode, 0)
if err != nil {
return err
}
needSync = true
}
}
nw := nodeWriter{
ctx: ctx,
kbfsOps: kbfsOps,
node: fileNode,
off: off,
verbose: *verbose,
}
written, err := io.Copy(&nw, os.Stdin)
if err != nil {
return err
}
if written > 0 {
needSync = true
}
if needSync {
if *verbose {
fmt.Fprintf(os.Stderr, "Syncing %s\n", p)
}
err := kbfsOps.SyncAll(ctx, fileNode.GetFolderBranch())
if err != nil {
return err
}
}
return nil
}
func write(ctx context.Context, config libkbfs.Config, args []string) (exitStatus int) {
err := writeHelper(ctx, config, args)
if err != nil {
printError("write", err)
exitStatus = 1
}
return
}