syncthing/internal/versioner/external.go
2015-03-19 11:31:21 +01:00

90 lines
2.1 KiB
Go

// Copyright (C) 2015 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.
package versioner
import (
"errors"
"os"
"os/exec"
"path/filepath"
"strings"
)
func init() {
// Register the constructor for this type of versioner with the name "external"
Factories["external"] = NewExternal
}
// The type holds our configuration
type External struct {
command string
folderPath string
}
// The constructor function takes a map of parameters and creates the type.
func NewExternal(folderID, folderPath string, params map[string]string) Versioner {
command := params["command"]
s := External{
command: command,
folderPath: folderPath,
}
if debug {
l.Debugf("instantiated %#v", s)
}
return s
}
// Move away the named file to a version archive. If this function returns
// nil, the named file does not exist any more (has been archived).
func (v External) Archive(filePath string) error {
_, err := os.Lstat(filePath)
if os.IsNotExist(err) {
if debug {
l.Debugln("not archiving nonexistent file", filePath)
}
return nil
} else if err != nil {
return err
}
if debug {
l.Debugln("archiving", filePath)
}
inFolderPath, err := filepath.Rel(v.folderPath, filePath)
if err != nil {
return err
}
if v.command == "" {
return errors.New("Versioner: command is empty, please enter a valid command")
}
cmd := exec.Command(v.command, v.folderPath, inFolderPath)
env := os.Environ()
// filter STGUIAUTH and STGUIAPIKEY from environment variables
filteredEnv := []string{}
for _, x := range env {
if !strings.HasPrefix(x, "STGUIAUTH=") && !strings.HasPrefix(x, "STGUIAPIKEY=") {
filteredEnv = append(filteredEnv, x)
}
}
cmd.Env = filteredEnv
err = cmd.Run()
if err != nil {
return err
}
// return error if the file was not removed
if _, err = os.Lstat(filePath); os.IsNotExist(err) {
return nil
}
return errors.New("Versioner: file was not removed by external script")
}