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https://github.com/apple/container.git
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Kathryn Baldauf
e283e023ab
Fixes an issue first described in https://github.com/apple/container/issues/740. Previously the initial process of the container was using vminitd's environment variables to find the target executable. This PR updates the code to use the container's configured environment for the initial process instead. The behavior of an exec in a container should be the same as before. Signed-off-by: Kathryn Baldauf <k_baldauf@apple.com>
87 lines
3.0 KiB
Swift
87 lines
3.0 KiB
Swift
//===----------------------------------------------------------------------===//
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// Copyright © 2025 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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import Foundation
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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: { path in
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let split = path.split(separator: "=")
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return split.count == 2 && split[0] == "PATH"
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})
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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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