-/*
-goredo -- djb's redo implementation on pure Go
-Copyright (C) 2020-2021 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
-the Free Software Foundation, version 3 of the License.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program. If not, see <http://www.gnu.org/licenses/>.
-*/
+// goredo -- djb's redo implementation on pure Go
+// Copyright (C) 2020-2024 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
+// the Free Software Foundation, version 3 of the License.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
// Inode metainformation
package main
import (
- "errors"
+ "bytes"
+ "encoding/binary"
"os"
"strconv"
"golang.org/x/sys/unix"
)
-const EnvInodeNoTrust = "REDO_INODE_NO_TRUST"
+const InodeLen = 6 * 8
-var InodeTrust = false
+type InodeTrustType int
-type Inode struct {
- Size int64
- CtimeSec int64
- CtimeNsec int64
-}
+//go:generate stringer -type=InodeTrustType
+const (
+ EnvInodeTrust = "REDO_INODE_TRUST"
+
+ InodeTrustNone InodeTrustType = iota
+ InodeTrustCtime
+ InodeTrustMtime
+)
+
+var InodeTrust InodeTrustType
+
+// It is big-endian 64-bit unsigned integers: size, inodeNum,
+// ctime sec, ctime nsec, mtime sec, mtime nsec.
+type Inode [InodeLen]byte
func (our *Inode) Equals(their *Inode) bool {
- return (our.Size == their.Size) &&
- (our.CtimeSec == their.CtimeSec) &&
- (our.CtimeNsec == their.CtimeNsec)
+ if !bytes.Equal(our[:2*8], their[:2*8]) {
+ return false
+ }
+ switch InodeTrust {
+ case InodeTrustCtime:
+ if !bytes.Equal(our[2*8:4*8], their[2*8:4*8]) {
+ return false
+ }
+ case InodeTrustMtime:
+ if !bytes.Equal(our[4*8:6*8], their[4*8:6*8]) {
+ return false
+ }
+ }
+ return true
}
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: "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
+func inodeFromFileStat(fi os.FileInfo, stat unix.Stat_t) *Inode {
+ ctimeSec, ctimeNsec := stat.Ctim.Unix()
+ mtimeSec := fi.ModTime().Unix()
+ mtimeNsec := fi.ModTime().UnixNano()
+ inode := new(Inode)
+ binary.BigEndian.PutUint64(inode[0*8:1*8], uint64(fi.Size()))
+ binary.BigEndian.PutUint64(inode[1*8:2*8], uint64(stat.Ino))
+ binary.BigEndian.PutUint64(inode[2*8:3*8], uint64(ctimeSec))
+ binary.BigEndian.PutUint64(inode[3*8:4*8], uint64(ctimeNsec))
+ binary.BigEndian.PutUint64(inode[4*8:5*8], uint64(mtimeSec))
+ binary.BigEndian.PutUint64(inode[5*8:6*8], uint64(mtimeNsec))
+ return inode
+}
+
+func inodeFromFileByFd(fd *os.File) (inode *Inode, isDir bool, err error) {
fi, err := fd.Stat()
if err != nil {
- return nil, err
+ return
+ }
+ if fi.IsDir() {
+ isDir = true
+ return
}
var stat unix.Stat_t
err = unix.Fstat(int(fd.Fd()), &stat)
if err != nil {
- return nil, err
+ return
}
- sec, nsec := stat.Ctim.Unix()
- return &Inode{Size: fi.Size(), CtimeSec: sec, CtimeNsec: nsec}, nil
+ inode = inodeFromFileStat(fi, stat)
+ return
}
-func inodeFromRec(m map[string]string) (*Inode, error) {
- size := m["Size"]
- ctimeSec := m["CtimeSec"]
- ctimeNsec := m["CtimeNsec"]
- if size == "" {
- return nil, errors.New("Size is missing")
- }
- if ctimeSec == "" {
- return nil, errors.New("CtimeSec is missing")
- }
- if ctimeNsec == "" {
- return nil, errors.New("CtimeNsec is missing")
- }
- inode := Inode{}
- var err error
- inode.Size, err = strconv.ParseInt(size, 10, 64)
+func inodeFromFileByPath(p string) (*Inode, error) {
+ fi, err := os.Stat(p)
if err != nil {
return nil, err
}
- inode.CtimeSec, err = strconv.ParseInt(ctimeSec, 10, 64)
- if err != nil {
- return nil, 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
}
- return &inode, nil
+ return inodeFromFileStat(fi, stat), nil
}