wehub-resource-sync
89 lines
3.0 KiB
Swift
89 lines
3.0 KiB
Swift
//===----------------------------------------------------------------------===//
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// Copyright © 2025-2026 Apple Inc. and the Containerization project authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//===----------------------------------------------------------------------===//
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#if canImport(FoundationEssentials)
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import FoundationEssentials
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#else
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import Foundation
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#endif
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/// `Path` provides utilities to look for binaries in the current PATH,
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/// or to return the current PATH.
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public struct Path {
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/// lookPath looks up an executable's path from $PATH
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public static func lookPath(_ name: String) -> URL? {
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lookup(name, path: getCurrentPath())
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}
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public static func lookPath(_ name: String, path: String) -> URL? {
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lookup(name, path: path)
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}
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// getEnv returns the default environment of the process
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// with the default $PATH added for the context of a macOS application bundle
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public static func getEnv() -> [String: String] {
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var env = ProcessInfo.processInfo.environment
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env["PATH"] = getCurrentPath()
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return env
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}
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private static func lookup(_ name: String, path: String) -> URL? {
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// Return nil for empty names
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if name.isEmpty {
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return nil
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}
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if name.contains("/") {
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if findExec(name) {
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return URL(fileURLWithPath: name)
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}
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return nil
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}
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for var lookdir in path.split(separator: ":") {
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if lookdir.isEmpty {
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lookdir = "."
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}
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let file = URL(fileURLWithPath: String(lookdir)).appendingPathComponent(name)
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if findExec(file.path) {
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return file
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}
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}
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return nil
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}
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/// getPath returns $PATH for the current process
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public static func getCurrentPath() -> String {
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let env = ProcessInfo.processInfo.environment
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return env["PATH"] ?? "/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin"
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}
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// findPath returns a string containing the 'PATH' environment variable
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public static func findPath(_ env: [String]?) -> String? {
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guard let env = env else {
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return nil
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}
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return env.first(where: { $0.hasPrefix("PATH=") })
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.map { String($0.dropFirst(5)) }
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}
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// findExec returns true if the provided path is an executable
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private static func findExec(_ path: String) -> Bool {
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let fm = FileManager.default
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return fm.isExecutableFile(atPath: path)
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}
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}
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