k3s/vendor/github.com/opencontainers/runtime-tools/filepath/ancestor.go
Darren Shepherd fa08d6076c Update vendor
2019-01-11 21:58:27 -07:00

33 lines
714 B
Go

package filepath
import (
"fmt"
"strings"
)
// IsAncestor returns true when pathB is an strict ancestor of pathA,
// and false where the paths are equal or pathB is outside of pathA.
// Paths that are not absolute will be made absolute with Abs.
func IsAncestor(os, pathA, pathB, cwd string) (_ bool, err error) {
if pathA == pathB {
return false, nil
}
pathA, err = Abs(os, pathA, cwd)
if err != nil {
return false, err
}
pathB, err = Abs(os, pathB, cwd)
if err != nil {
return false, err
}
sep := Separator(os)
if !strings.HasSuffix(pathA, string(sep)) {
pathA = fmt.Sprintf("%s%c", pathA, sep)
}
if pathA == pathB {
return false, nil
}
return strings.HasPrefix(pathB, pathA), nil
}