1 // NNCP -- Node to Node copy, utilities for store-and-forward data exchange
2 // Copyright (C) 2016-2024 Sergey Matveev <stargrave@stargrave.org>
4 // This program is free software: you can redistribute it and/or modify
5 // it under the terms of the GNU General Public License as published by
6 // the Free Software Foundation, version 3 of the License.
8 // This program is distributed in the hope that it will be useful,
9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 // GNU General Public License for more details.
13 // You should have received a copy of the GNU General Public License
14 // along with this program. If not, see <http://www.gnu.org/licenses/>.
32 NoSync = os.Getenv(CfgNoSync) != ""
35 func TempFile(dir, prefix string) (*os.File, error) {
36 // Assume that probability of suffix collision is negligible
37 suffix := strconv.FormatInt(time.Now().UnixNano()+int64(os.Getpid()), 16)
38 name := filepath.Join(dir, "nncp"+prefix+suffix)
39 return os.OpenFile(name, os.O_RDWR|os.O_CREATE|os.O_EXCL, os.FileMode(0666))
42 func (ctx *Ctx) NewTmpFile() (*os.File, error) {
43 jobsPath := filepath.Join(ctx.Spool, "tmp")
44 if err := ensureDir(jobsPath); err != nil {
47 fd, err := TempFile(jobsPath, "")
49 ctx.LogD("tmp", LEs{{"Src", fd.Name()}}, func(les LEs) string {
50 return "Temporary file created: " + fd.Name()
56 type TmpFileWHash struct {
63 func (ctx *Ctx) NewTmpFileWHash() (*TmpFileWHash, error) {
64 tmp, err := ctx.NewTmpFile()
70 W: bufio.NewWriter(io.MultiWriter(hsh, tmp)),
77 func (tmp *TmpFileWHash) Cancel() {
80 os.Remove(tmp.Fd.Name())
83 func DirSync(dirPath string) error {
87 fd, err := os.Open(dirPath)
99 func (tmp *TmpFileWHash) Checksum() string {
100 return Base32Codec.EncodeToString(tmp.Hsh.Sum(nil))
103 func (tmp *TmpFileWHash) Commit(dir string) error {
105 if err = ensureDir(dir); err != nil {
108 if err = tmp.W.Flush(); err != nil {
113 if err = tmp.Fd.Sync(); err != nil {
118 if err = tmp.Fd.Close(); err != nil {
121 checksum := tmp.Checksum()
124 LEs{{"Src", tmp.Fd.Name()}, {"Dst", checksum}},
125 func(les LEs) string {
126 return fmt.Sprintf("Temporary file: %s -> %s", tmp.Fd.Name(), checksum)
129 if err = os.Rename(tmp.Fd.Name(), filepath.Join(dir, checksum)); err != nil {