restic/node_linux.go

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package restic
import (
"fmt"
"os"
"os/user"
"strconv"
"syscall"
"time"
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"github.com/restic/restic/debug"
)
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func (node *Node) OpenForReading() (*os.File, error) {
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file, err := os.OpenFile(node.path, os.O_RDONLY|syscall.O_NOATIME, 0)
if os.IsPermission(err) {
return os.OpenFile(node.path, os.O_RDONLY, 0)
}
return file, err
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}
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func (node *Node) fillExtra(path string, fi os.FileInfo) error {
stat, ok := fi.Sys().(*syscall.Stat_t)
if !ok {
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return nil
}
node.ChangeTime = time.Unix(stat.Ctim.Unix())
node.AccessTime = time.Unix(stat.Atim.Unix())
node.UID = stat.Uid
node.GID = stat.Gid
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if u, err := user.LookupId(strconv.Itoa(int(stat.Uid))); err == nil {
node.User = u.Username
}
node.Inode = stat.Ino
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var err error
switch node.Type {
case "file":
node.Size = uint64(stat.Size)
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node.Links = uint64(stat.Nlink)
case "dir":
case "symlink":
node.LinkTarget, err = os.Readlink(path)
case "dev":
node.Device = stat.Rdev
case "chardev":
node.Device = stat.Rdev
case "fifo":
case "socket":
default:
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err = fmt.Errorf("invalid node type %q", node.Type)
}
return err
}
func (node *Node) createDevAt(path string) error {
return syscall.Mknod(path, syscall.S_IFBLK|0600, int(node.Device))
}
func (node *Node) createCharDevAt(path string) error {
return syscall.Mknod(path, syscall.S_IFCHR|0600, int(node.Device))
}
func (node *Node) createFifoAt(path string) error {
return syscall.Mkfifo(path, 0600)
}
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func (node *Node) isNewer(path string, fi os.FileInfo) bool {
if node.Type != "file" {
debug.Log("node.isNewer", "node %v is newer: not file", path)
return true
}
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tpe := nodeTypeFromFileInfo(fi)
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if node.Name != fi.Name() || node.Type != tpe {
debug.Log("node.isNewer", "node %v is newer: name or type changed", path)
return true
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}
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extendedStat := fi.Sys().(*syscall.Stat_t)
changeTime := time.Unix(extendedStat.Ctim.Unix())
inode := extendedStat.Ino
size := uint64(extendedStat.Size)
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if node.ModTime != fi.ModTime() ||
node.ChangeTime != changeTime ||
node.Inode != inode ||
node.Size != size {
debug.Log("node.isNewer", "node %v is newer: timestamp, size or inode changed", path)
return true
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}
debug.Log("node.isNewer", "node %v is not newer", path)
return false
}