native macOS codings agent orchestrator prowl.onev.cat
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1.9 kB · 64 lines
Swift
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465import Foundation
#if canImport(Darwin) import Darwin#elseif canImport(Glibc) import Glibc#endif
nonisolated enum StableOwnerFileReadResult: Equatable, Sendable { case stable(Data) case changed case oversized case unreadable}
nonisolated enum StableOwnerFileReader { static func read( _ url: URL, maximumBytes: Int, afterRead: () -> Void = {} ) -> StableOwnerFileReadResult { let path = url.path(percentEncoded: false) let descriptor = Darwin.open(path, O_RDONLY | O_NOFOLLOW | O_NONBLOCK | O_CLOEXEC) guard descriptor >= 0 else { return .unreadable } defer { Darwin.close(descriptor) } var before = stat() guard fstat(descriptor, &before) == 0, (before.st_mode & S_IFMT) == S_IFREG, before.st_uid == geteuid(), before.st_size >= 0 else { return .unreadable } guard before.st_size <= maximumBytes else { return .oversized }
var data = Data(count: Int(before.st_size)) var offset = 0 while offset < data.count { let count = data.withUnsafeMutableBytes { buffer in Darwin.read(descriptor, buffer.baseAddress?.advanced(by: offset), buffer.count - offset) } guard count > 0 else { return .unreadable } offset += count } afterRead()
var descriptorAfter = stat() var pathAfter = stat() guard fstat(descriptor, &descriptorAfter) == 0, lstat(path, &pathAfter) == 0, sameSnapshot(before, descriptorAfter), sameSnapshot(descriptorAfter, pathAfter), (pathAfter.st_mode & S_IFMT) == S_IFREG, pathAfter.st_uid == geteuid() else { return .changed } return .stable(data) }
private static func sameSnapshot(_ lhs: stat, _ rhs: stat) -> Bool { lhs.st_dev == rhs.st_dev && lhs.st_ino == rhs.st_ino && lhs.st_size == rhs.st_size && lhs.st_mtimespec.tv_sec == rhs.st_mtimespec.tv_sec && lhs.st_mtimespec.tv_nsec == rhs.st_mtimespec.tv_nsec }}