1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
package system
import (
"fmt"
"os"
)
// Link registers an Op that links dst to src.
func (sys *I) Link(oldname, newname string) *I { return sys.LinkFileType(Process, oldname, newname) }
// LinkFileType registers a file linking Op labelled with type et.
func (sys *I) LinkFileType(et Enablement, oldname, newname string) *I {
sys.lock.Lock()
defer sys.lock.Unlock()
sys.ops = append(sys.ops, &Hardlink{et, newname, oldname})
return sys
}
type Hardlink struct {
et Enablement
dst, src string
}
func (l *Hardlink) Type() Enablement { return l.et }
func (l *Hardlink) apply(*I) error {
msg.Verbose("linking", l)
return wrapErrSuffix(os.Link(l.src, l.dst),
fmt.Sprintf("cannot link %q:", l.dst))
}
func (l *Hardlink) revert(_ *I, ec *Criteria) error {
if ec.hasType(l) {
msg.Verbosef("removing hard link %q", l.dst)
return wrapErrSuffix(os.Remove(l.dst),
fmt.Sprintf("cannot remove hard link %q:", l.dst))
} else {
msg.Verbosef("skipping hard link %q", l.dst)
return nil
}
}
func (l *Hardlink) Is(o Op) bool { l0, ok := o.(*Hardlink); return ok && l0 != nil && *l == *l0 }
func (l *Hardlink) Path() string { return l.src }
func (l *Hardlink) String() string { return fmt.Sprintf("%q from %q", l.dst, l.src) }
|
