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import SystemPackage
/// Split the given path to the parent and the last component to be passed to openat
/// Note: `SystemPackage.FilePath` strips explicit trailing "/" by normalization at `init`,
/// so this function takes path as a `String`.
internal func splitParent(path: String) -> (FilePath, FilePath.Component)? {
func pathRequiresDirectory(path: String) -> Bool {
return path.hasSuffix("/") || path.hasSuffix("/.")
}
guard !path.isEmpty else { return nil }
if pathRequiresDirectory(path: path) {
// Create a link to the directory itself
return (FilePath(path), FilePath.Component("."))
}
let filePath = FilePath(path)
var components = filePath.components
if let c = components.popLast() {
switch c.kind {
case .regular, .currentDirectory:
return (FilePath(root: filePath.root, components), c)
case .parentDirectory:
// Create a link to the parent directory itself
return (filePath, FilePath.Component("."))
}
} else {
fatalError("non-empty path should have at least one component")
}
}
extension SandboxPrimitives {
static func openParent(start: FileDescriptor, path: String) throws -> (FileDescriptor, String) {
guard let (dirName, basename) = splitParent(path: path) else {
throw WASIAbi.Errno.ENOENT
}
let dirFd: FileDescriptor
if !dirName.isEmpty {
dirFd = try openAt(
start: start, path: dirName,
mode: .readOnly, options: .directory,
permissions: []
)
} else {
dirFd = start
}
return (dirFd, basename.string)
}
}
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