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/*
This source file is part of the Swift.org open source project
Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
Licensed under Apache License v2.0 with Runtime Library Exception
See http://swift.org/LICENSE.txt for license information
See http://swift.org/CONTRIBUTORS.txt for Swift project authors
*/
import TSCBasic
import Foundation
/// Recognized Platform types.
@available(*, deprecated, message: "moved to SourceKit-LSP")
public enum Platform: Equatable {
case android
case darwin
case linux(LinuxFlavor)
case windows
/// Recognized flavors of linux.
public enum LinuxFlavor: Equatable {
case debian
case fedora
}
/// Lazily checked current platform.
public static var currentPlatform = Platform.findCurrentPlatform(localFileSystem)
/// Returns the cache directories used in Darwin.
private static var darwinCacheDirectoriesLock = NSLock()
private static var _darwinCacheDirectories: [AbsolutePath]? = .none
/// Attempt to match `uname` with recognized platforms.
internal static func findCurrentPlatform(_ fileSystem: FileSystem) -> Platform? {
#if os(Windows)
return .windows
#else
guard let uname = try? Process.checkNonZeroExit(args: "uname").spm_chomp().lowercased() else { return nil }
switch uname {
case "darwin":
return .darwin
case "linux":
return Platform.findCurrentPlatformLinux(fileSystem)
default:
return nil
}
#endif
}
internal static func findCurrentPlatformLinux(_ fileSystem: FileSystem) -> Platform? {
do {
if try fileSystem.isFile(AbsolutePath(validating: "/etc/debian_version")) {
return .linux(.debian)
}
if try fileSystem.isFile(AbsolutePath(validating: "/system/bin/toolbox")) ||
fileSystem.isFile(AbsolutePath(validating: "/system/bin/toybox")) {
return .android
}
if try fileSystem.isFile(AbsolutePath(validating: "/etc/redhat-release")) ||
fileSystem.isFile(AbsolutePath(validating: "/etc/centos-release")) ||
fileSystem.isFile(AbsolutePath(validating: "/etc/fedora-release")) ||
Platform.isAmazonLinux2(fileSystem) {
return .linux(.fedora)
}
} catch {}
return nil
}
private static func isAmazonLinux2(_ fileSystem: FileSystem) -> Bool {
do {
let release = try fileSystem.readFileContents(AbsolutePath(validating: "/etc/system-release")).cString
return release.hasPrefix("Amazon Linux release 2")
} catch {
return false
}
}
/// Returns the cache directories used in Darwin.
public static func darwinCacheDirectories() throws -> [AbsolutePath] {
try Self.darwinCacheDirectoriesLock.withLock {
if let darwinCacheDirectories = Self._darwinCacheDirectories {
return darwinCacheDirectories
}
var directories = [AbsolutePath]()
// Compute the directories.
try directories.append(AbsolutePath(validating: "/private/var/tmp"))
(try? TSCBasic.determineTempDirectory()).map{ directories.append($0) }
#if canImport(Darwin)
getConfstr(_CS_DARWIN_USER_TEMP_DIR).map({ directories.append($0) })
getConfstr(_CS_DARWIN_USER_CACHE_DIR).map({ directories.append($0) })
#endif
Self._darwinCacheDirectories = directories
return directories
}
}
#if canImport(Darwin)
/// Returns the value of given path variable using `getconf` utility.
///
/// - Note: This method returns `nil` if the value is an invalid path.
private static func getConfstr(_ name: Int32) -> AbsolutePath? {
let len = confstr(name, nil, 0)
let tmp = UnsafeMutableBufferPointer(start: UnsafeMutablePointer<Int8>.allocate(capacity: len), count:len)
defer { tmp.deallocate() }
guard confstr(name, tmp.baseAddress, len) == len else { return nil }
let value = String(cString: tmp.baseAddress!)
guard value.hasSuffix(AbsolutePath.root.pathString) else { return nil }
return try? resolveSymlinks(AbsolutePath(validating: value))
}
#endif
}
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