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
|
package system
import (
"fmt"
)
// Link calls LinkFileType with the [Process] criteria.
func (sys *I) Link(oldname, newname string) *I { return sys.LinkFileType(Process, oldname, newname) }
// LinkFileType maintains a hardlink until its [Enablement] is no longer satisfied.
func (sys *I) LinkFileType(et Enablement, oldname, newname string) *I {
sys.ops = append(sys.ops, &hardlinkOp{et, newname, oldname})
return sys
}
// hardlinkOp implements [I.LinkFileType].
type hardlinkOp struct {
et Enablement
dst, src string
}
func (l *hardlinkOp) Type() Enablement { return l.et }
func (l *hardlinkOp) apply(sys *I) error {
sys.verbose("linking", l)
return newOpError("hardlink", sys.link(l.src, l.dst), false)
}
func (l *hardlinkOp) revert(sys *I, ec *Criteria) error {
if ec.hasType(l.Type()) {
sys.verbosef("removing hard link %q", l.dst)
return newOpError("hardlink", sys.remove(l.dst), true)
} else {
sys.verbosef("skipping hard link %q", l.dst)
return nil
}
}
func (l *hardlinkOp) Is(o Op) bool {
target, ok := o.(*hardlinkOp)
return ok && l != nil && target != nil && *l == *target
}
func (l *hardlinkOp) Path() string { return l.src }
func (l *hardlinkOp) String() string { return fmt.Sprintf("%q from %q", l.dst, l.src) }
|
