Use Subprocess for process management

Package.swift

@@ -31,6 +31,7 @@ let package = Package(
         .package(url: "https://github.com/apple/swift-openapi-generator", from: "1.7.2"),
         .package(url: "https://github.com/apple/swift-openapi-runtime", from: "1.8.2"),
         .package(url: "https://github.com/apple/swift-system", from: "1.4.2"),
+        .package(url: "https://github.com/swiftlang/swift-subprocess", revision: "afc1f734feb29c3a1ebbd97cc1fe943f8e5d80e5"),
         // This dependency provides the correct version of the formatter so that you can run `swift run swiftformat Package.swift Plugins/ Sources/ Tests/`
         .package(url: "https://github.com/nicklockwood/SwiftFormat", exact: "0.49.18"),
     ],
@@ -67,6 +68,7 @@ let package = Package(
                 .product(name: "OpenAPIRuntime", package: "swift-openapi-runtime"),
                 .product(name: "OpenAPIAsyncHTTPClient", package: "swift-openapi-async-http-client"),
                 .product(name: "SystemPackage", package: "swift-system"),
+                .product(name: "Subprocess", package: "swift-subprocess"),
             ],
             swiftSettings: swiftSettings,
             plugins: ["GenerateCommandModels"]

Sources/LinuxPlatform/Linux.swift

@@ -255,7 +255,7 @@ public struct Linux: Platform {
         }
 
         if requireSignatureValidation {
-            guard (try? self.runProgram("gpg", "--version", quiet: true)) != nil else {
+            guard (try? await self.runProgram("gpg", "--version", quiet: true)) != nil else {
                 var msg = "gpg is not installed. "
                 if let manager {
                     msg += """
@@ -321,7 +321,7 @@ public struct Linux: Platform {
                 }
                 return false
             case "yum":
-                try self.runProgram("yum", "list", "installed", package, quiet: true)
+                try await self.runProgram("yum", "list", "installed", package, quiet: true)
                 return true
             default:
                 return true
@@ -382,7 +382,7 @@ public struct Linux: Platform {
                 tmpDir / String(name)
             }
 
-            try self.runProgram((tmpDir / "swiftly").string, "init")
+            try await self.runProgram((tmpDir / "swiftly").string, "init")
         }
     }
 

Sources/MacOSPlatform/MacOS.swift

@@ -142,7 +142,7 @@ public struct MacOS: Platform {
             try await sys.tar(.directory(installDir)).extract(.verbose, .archive(payload)).run(self, quiet: false)
         }
 
-        try self.runProgram((userHomeDir / ".swiftly/bin/swiftly").string, "init")
+        try await self.runProgram((userHomeDir / ".swiftly/bin/swiftly").string, "init")
     }
 
     public func uninstall(_ ctx: SwiftlyCoreContext, _ toolchain: ToolchainVersion, verbose: Bool)

Sources/SwiftlyCore/ModeledCommandLine.swift

@@ -181,7 +181,7 @@ extension Runnable {
             newEnv = newValue
         }
 
-        try p.runProgram([executable] + args, quiet: quiet, env: newEnv)
+        try await p.runProgram([executable] + args, quiet: quiet, env: newEnv)
     }
 }