mirror of https://github.com/restic/restic.git
110 lines
2.6 KiB
Go
110 lines
2.6 KiB
Go
package restic
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import (
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"fmt"
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"os"
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"os/user"
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"strconv"
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"syscall"
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"time"
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"github.com/restic/restic/debug"
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)
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func (node *Node) OpenForReading() (*os.File, error) {
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return os.Open(node.path)
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}
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func (node *Node) fillExtra(path string, fi os.FileInfo) (err error) {
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stat, ok := fi.Sys().(*syscall.Stat_t)
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if !ok {
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return
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}
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node.ChangeTime = time.Unix(stat.Ctimespec.Unix())
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node.AccessTime = time.Unix(stat.Atimespec.Unix())
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node.UID = stat.Uid
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node.GID = stat.Gid
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// TODO: cache uid lookup
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if u, nil := user.LookupId(strconv.Itoa(int(stat.Uid))); err == nil {
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node.User = u.Username
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}
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// TODO: implement getgrnam() or use https://github.com/kless/osutil
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// if g, nil := user.LookupId(strconv.Itoa(int(stat.Uid))); err == nil {
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// node.User = u.Username
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// }
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node.Inode = stat.Ino
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switch node.Type {
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case "file":
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node.Size = uint64(stat.Size)
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node.Links = uint64(stat.Nlink)
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case "dir":
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// nothing to do
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case "symlink":
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node.LinkTarget, err = os.Readlink(path)
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case "dev":
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node.Device = uint64(stat.Rdev)
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case "chardev":
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node.Device = uint64(stat.Rdev)
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case "fifo":
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// nothing to do
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case "socket":
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// nothing to do
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default:
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panic(fmt.Sprintf("invalid node type %q", node.Type))
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}
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return err
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}
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func (node *Node) createDevAt(path string) error {
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return syscall.Mknod(path, syscall.S_IFBLK|0600, int(node.Device))
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}
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func (node *Node) createCharDevAt(path string) error {
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return syscall.Mknod(path, syscall.S_IFCHR|0600, int(node.Device))
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}
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func (node *Node) createFifoAt(path string) error {
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return syscall.Mkfifo(path, 0600)
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}
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func (node *Node) isNewer(path string, fi os.FileInfo) bool {
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// if this node has a type other than "file", treat as if content has changed
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if node.Type != "file" {
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debug.Log("node.isNewer", "node %v is newer: not file", path)
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return true
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}
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// if the name or type has changed, this is surely something different
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tpe := nodeTypeFromFileInfo(path, fi)
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if node.Name != fi.Name() || node.Type != tpe {
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debug.Log("node.isNewer", "node %v is newer: name or type changed", path)
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return false
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}
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// collect extended stat
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stat := fi.Sys().(*syscall.Stat_t)
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changeTime := time.Unix(stat.Ctimespec.Unix())
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inode := stat.Ino
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size := uint64(stat.Size)
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// if timestamps or inodes differ, content has changed
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if node.ModTime != fi.ModTime() ||
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node.ChangeTime != changeTime ||
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node.Inode != inode ||
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node.Size != size {
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debug.Log("node.isNewer", "node %v is newer: timestamp or inode changed", path)
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return false
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}
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// otherwise the node is assumed to have the same content
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debug.Log("node.isNewer", "node %v is not newer", path)
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return false
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}
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