SPM fails to parse manifest with no error

grosch · October 30, 2020, 7:09pm

I'm using the 5.3 release version of the CentOS 7 swift bundle with the package.swift file shown below. I can build this on mac without issue, but when I run the build command on the CentOS system, it's giving me this error that I don't understand:

$ swift build --enable-test-discovery -c release
/home/scott/push: error: manifest parse error(s):
The operation could not be completed. (TSCBasic.Process.Error error 0.)

This is the contents of my Package.swift file:

// swift-tools-version:5.3
// The swift-tools-version declares the minimum version of Swift required to build this package.

import PackageDescription

let package = Package(
    name: "push",
    platforms: [
       .macOS(.v10_15)
    ],
    dependencies: [
        .package(url: "https://github.com/vapor/postgres-kit.git", from: "2.0.0"),
        .package(name: "apnswift", url: "https://github.com/kylebrowning/APNSwift.git", from: "2.1.0")
    ],
    targets: [
        .target(
            name: "push", dependencies: [
                .product(name: "PostgresKit", package: "postgres-kit"),
                .product(name: "APNSwift", package: "apnswift")
        ]),
        .testTarget( name: "pushTests", dependencies: ["push"]),
    ]
)

SDGGiesbrecht · October 30, 2020, 7:43pm

TSCBasic.Process.Error 0 appears to mean an executable couldn’t be located.

github.com

apple/swift-tools-support-core/blob/8c3dfd42a36d0416345143eae4567d9314c12246/Sources/TSCBasic/Process.swift#L115-L124


      
          /// Process allows spawning new subprocesses and working with them.
          ///
          /// Note: This class is thread safe.
          public final class Process: ObjectIdentifierProtocol {
          
          
    /// Errors when attempting to invoke a process
              public enum Error: Swift.Error {
                  /// The program requested to be executed cannot be found on the existing search paths, or is not executable.
                  case missingExecutableProgram(program: String)
              }

If the error occurs exactly as you have posted it—immediately after the invocation and before any output about fetching dependencies for resolution—then I suspect the issue may be that Git is not installed. If it isn’t Git, then it may be some other process SwiftPM needs that isn’t included in the toolchain. Swift’s installation instructions mention several such things that need to be installed first.