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