Michael Crosby
41 lines
1.6 KiB
Swift
41 lines
1.6 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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import ContainerizationError
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import Crypto
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import Foundation
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extension Mount {
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/// A deterministic hash of the mount's source path, used as the virtiofs tag.
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///
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/// Resolves symlinks before hashing so that different paths to the same
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/// directory produce an identical tag.
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public var tagHash: String {
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get throws {
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try hashFilePath(path: self.source)
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}
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}
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}
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func hashFilePath(path: String) throws -> String {
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// Resolve symlinks so different paths to the same directory get the same hash.
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let resolvedSource = URL(fileURLWithPath: path).resolvingSymlinksInPath().path
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guard let data = resolvedSource.data(using: .utf8) else {
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throw ContainerizationError(.invalidArgument, message: "\(path) could not be converted to Data")
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}
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return String(SHA256.hash(data: data).encoded.prefix(36))
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}
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