fix(vminitd): redact environment variable values from debug logs

vminitd/Sources/vminitd/LogRedaction.swift

@@ -0,0 +1,66 @@
+//===----------------------------------------------------------------------===//
+// Copyright © 2025-2026 Apple Inc. and the Containerization project authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//===----------------------------------------------------------------------===//
+
+import ContainerizationOCI
+
+/// Redacts environment variable values from a list of env vars in "KEY=VALUE" format.
+/// Returns the env vars with values replaced by "<redacted>".
+func redactEnvValues(_ env: [String]) -> [String] {
+    env.map { entry in
+        if let equalsIndex = entry.firstIndex(of: "=") {
+            let key = entry[..<equalsIndex]
+            return "\(key)=<redacted>"
+        }
+        return entry
+    }
+}
+
+/// A log-safe representation of a Process that redacts environment variable values.
+struct RedactedProcess: CustomStringConvertible {
+    let process: ContainerizationOCI.Process
+
+    var description: String {
+        var copy = process
+        copy.env = redactEnvValues(copy.env)
+        return "\(copy)"
+    }
+}
+
+/// A log-safe representation of a Spec that redacts environment variable values.
+struct RedactedSpec: CustomStringConvertible {
+    let spec: ContainerizationOCI.Spec
+
+    var description: String {
+        var copy = spec
+        if var process = copy.process {
+            process.env = redactEnvValues(process.env)
+            copy.process = process
+        }
+        return "\(copy)"
+    }
+}
+
+extension ContainerizationOCI.Spec {
+    var redacted: RedactedSpec {
+        RedactedSpec(spec: self)
+    }
+}
+
+extension ContainerizationOCI.Process {
+    var redacted: RedactedProcess {
+        RedactedProcess(process: self)
+    }
+}

vminitd/Sources/vminitd/ManagedContainer.swift

@@ -53,7 +53,7 @@ actor ManagedContainer {
             path: Self.craftBundlePath(id: id),
             spec: spec
         )
-        log.debug("created bundle with spec \(spec)")
+        log.debug("created bundle with spec \(spec.redacted)")
 
         let cgManager = Cgroup2Manager(
             group: URL(filePath: cgroupsPath),
@@ -163,7 +163,7 @@ extension ManagedContainer {
         stdio: HostStdio,
         process: ContainerizationOCI.Process
     ) throws {
-        log.debug("creating exec process with \(process)")
+        log.debug("creating exec process with \(process.redacted)")
 
         // Write the process config to the bundle, and pass this on
         // over to ManagedProcess to deal with.