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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift open source project
//
// Copyright (c) 2025 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 the list of Swift project authors
//
//===----------------------------------------------------------------------===//
import SWBLibc
/// Represents an opaque signature of a list of files.
///
/// If any path is a directory, the directory hierarchy is recursively traversed and all files in the hierarchy are collected to add to the signature.
///
/// The signature returned is a byte string constructed from an MD5 of properties of all of the files, so the order of `paths` is significant, and a different signature may be returned for different orderings.
public struct FilesSignature: Hashable, Encodable, Sendable {
fileprivate let signature: ByteString
public init(_ paths: [Path], fs: any FSProxy = localFS) {
signature = fs.filesSignature(paths)
}
/// Whether the signatures are equivalent.
public static func == (lhs: FilesSignature, rhs: FilesSignature) -> Bool {
return lhs.signature == rhs.signature
}
public func hash(into hasher: inout Hasher) {
hasher.combine(signature)
}
}
extension FilesSignature: SerializableCodable {
public func serialize<T: Serializer>(to serializer: T) {
serializer.serialize(signature)
}
public init(from deserializer: any Deserializer) throws {
signature = try deserializer.deserialize()
}
}
fileprivate extension FSProxy {
/// Returns the signature of a list of files.
///
/// If any path is a directory, then this method recursively traverses the directory hierarchy and collects all files in the hierarchy to add to the signature.
///
/// The signature returned is a byte string constructed from an MD5 of properties of all of the files, so the order of `paths` is significant, and a different signature may be returned for different orderings.
func filesSignature(_ paths: [Path]) -> ByteString {
var stats: [(Path, stat?)] = []
for path in paths {
if isDirectory(path) {
do {
try traverse(path) { subPath in
stats.append((subPath, try? getFileInfo(subPath).statBuf))
}
} catch {
stats.append((path, nil))
}
} else {
stats.append((path, try? getFileInfo(path).statBuf))
}
}
return filesSignature(stats)
}
/// Returns the signature of a list of files.
func filesSignature(_ statInfos: [(Path, stat?)]) -> ByteString {
let md5Context = InsecureHashContext()
for (path, statInfo) in statInfos {
md5Context.add(string: path.str)
if let statInfo {
md5Context.add(string: "stat")
md5Context.add(number: statInfo.st_ino)
md5Context.add(number: statInfo.st_dev)
md5Context.add(number: statInfo.st_size)
md5Context.add(number: statInfo.st_mtimespec.tv_sec)
md5Context.add(number: statInfo.st_mtimespec.tv_nsec)
} else {
md5Context.add(string: "<missing>")
}
}
return md5Context.signature
}
}
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