/*
goredo -- djb's redo implementation on pure Go
-Copyright (C) 2020-2021 Sergey Matveev <stargrave@stargrave.org>
+Copyright (C) 2020-2023 Sergey Matveev <stargrave@stargrave.org>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
package main
import (
- "errors"
+ "encoding/binary"
"os"
"strconv"
"golang.org/x/sys/unix"
)
+const InodeLen = 6 * 8
+
type InodeTrustType int
//go:generate stringer -type=InodeTrustType
var InodeTrust InodeTrustType
-type Inode struct {
- Size int64
- CtimeSec int64
- CtimeNsec int64
- MtimeSec int64
- MtimeNsec int64
-}
+// It is big-endian 64-bit unsigned integers: size, inodeNum,
+// ctime sec, ctime nsec, mtime sec, mtime nsec.
+type Inode string
-func (our *Inode) Equals(their *Inode) bool {
- if our.Size != their.Size {
+func (our Inode) Equals(their Inode) bool {
+ if our[:2*8] != their[:2*8] {
return false
}
switch InodeTrust {
case InodeTrustCtime:
- if our.CtimeSec != their.CtimeSec || our.CtimeNsec != their.CtimeNsec {
+ if our[2*8:4*8] != their[2*8:4*8] {
return false
}
case InodeTrustMtime:
- if our.MtimeSec == 0 || our.MtimeNsec == 0 {
- return false
- }
- if our.MtimeSec != their.MtimeSec || our.MtimeNsec != their.MtimeNsec {
+ if our[4*8:6*8] != their[4*8:6*8] {
return false
}
}
return true
}
-func (inode *Inode) RecfileFields() []recfile.Field {
+func (inode Inode) RecfileFields() []recfile.Field {
return []recfile.Field{
- {Name: "Size", Value: strconv.FormatInt(inode.Size, 10)},
- {Name: "CtimeSec", Value: strconv.FormatInt(inode.CtimeSec, 10)},
- {Name: "CtimeNsec", Value: strconv.FormatInt(inode.CtimeNsec, 10)},
- {Name: "MtimeSec", Value: strconv.FormatInt(inode.MtimeSec, 10)},
- {Name: "MtimeNsec", Value: strconv.FormatInt(inode.MtimeNsec, 10)},
+ {Name: "Size", Value: strconv.FormatUint(binary.BigEndian.Uint64(
+ []byte(inode[0*8:1*8])), 10)},
+ {Name: "InodeNum", Value: strconv.FormatUint(binary.BigEndian.Uint64(
+ []byte(inode[1*8:2*8])), 10)},
+ {Name: "CtimeSec", Value: strconv.FormatUint(binary.BigEndian.Uint64(
+ []byte(inode[2*8:3*8])), 10)},
+ {Name: "CtimeNsec", Value: strconv.FormatUint(binary.BigEndian.Uint64(
+ []byte(inode[3*8:4*8])), 10)},
+ {Name: "MtimeSec", Value: strconv.FormatUint(binary.BigEndian.Uint64(
+ []byte(inode[4*8:5*8])), 10)},
+ {Name: "MtimeNsec", Value: strconv.FormatUint(binary.BigEndian.Uint64(
+ []byte(inode[5*8:6*8])), 10)},
}
}
-func inodeFromFile(fd *os.File) (*Inode, error) {
- var fi os.FileInfo
- fi, err := fd.Stat()
- if err != nil {
- return nil, err
- }
- var stat unix.Stat_t
- err = unix.Fstat(int(fd.Fd()), &stat)
- if err != nil {
- return nil, err
- }
+func inodeFromFileStat(fi os.FileInfo, stat unix.Stat_t) Inode {
ctimeSec, ctimeNsec := stat.Ctim.Unix()
mtimeSec := fi.ModTime().Unix()
mtimeNsec := fi.ModTime().UnixNano()
- return &Inode{
- Size: fi.Size(),
- CtimeSec: ctimeSec, CtimeNsec: ctimeNsec,
- MtimeSec: mtimeSec, MtimeNsec: mtimeNsec,
- }, nil
+ buf := make([]byte, InodeLen)
+ binary.BigEndian.PutUint64(buf[0*8:1*8], uint64(fi.Size()))
+ binary.BigEndian.PutUint64(buf[1*8:2*8], uint64(stat.Ino))
+ binary.BigEndian.PutUint64(buf[2*8:3*8], uint64(ctimeSec))
+ binary.BigEndian.PutUint64(buf[3*8:4*8], uint64(ctimeNsec))
+ binary.BigEndian.PutUint64(buf[4*8:5*8], uint64(mtimeSec))
+ binary.BigEndian.PutUint64(buf[5*8:6*8], uint64(mtimeNsec))
+ return Inode(buf)
}
-func inodeFromRec(m map[string]string) (*Inode, error) {
- size := m["Size"]
- ctimeSec := m["CtimeSec"]
- ctimeNsec := m["CtimeNsec"]
- mtimeSec := m["MtimeSec"]
- mtimeNsec := m["MtimeNsec"]
- if size == "" {
- return nil, errors.New("Size is missing")
- }
- if ctimeSec == "" {
- return nil, errors.New("CtimeSec is missing")
+func inodeFromFileByFd(fd *os.File) (inode Inode, isDir bool, err error) {
+ fi, err := fd.Stat()
+ if err != nil {
+ return
}
- if ctimeNsec == "" {
- return nil, errors.New("CtimeNsec is missing")
+ if fi.IsDir() {
+ isDir = true
+ return
}
- inode := Inode{}
- var err error
- inode.Size, err = strconv.ParseInt(size, 10, 64)
+ var stat unix.Stat_t
+ err = unix.Fstat(int(fd.Fd()), &stat)
if err != nil {
- return nil, err
+ return
}
- inode.CtimeSec, err = strconv.ParseInt(ctimeSec, 10, 64)
+ inode = inodeFromFileStat(fi, stat)
+ return
+}
+
+func inodeFromFileByPath(p string) (Inode, error) {
+ fi, err := os.Stat(p)
if err != nil {
- return nil, err
+ return "", err
}
- inode.CtimeNsec, err = strconv.ParseInt(ctimeNsec, 10, 64)
+ var stat unix.Stat_t
+ err = unix.Stat(p, &stat)
if err != nil {
- return nil, err
- }
- if mtimeSec != "" {
- if mtimeNsec == "" {
- return nil, errors.New("MtimeNsec is missing")
- }
- inode.MtimeSec, err = strconv.ParseInt(mtimeSec, 10, 64)
- if err != nil {
- return nil, err
- }
- inode.MtimeNsec, err = strconv.ParseInt(mtimeNsec, 10, 64)
- if err != nil {
- return nil, err
- }
+ return "", err
}
- return &inode, nil
+ return inodeFromFileStat(fi, stat), nil
}