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| 1 | +using System.Collections.Generic; |
| 2 | +using System.IO; |
| 3 | +using System.Reflection; |
| 4 | +using Microsoft.DotNet.PlatformAbstractions; |
| 5 | +using SimpleJson; |
| 6 | + |
| 7 | +namespace LibGit2Sharp |
| 8 | +{ |
| 9 | + static class NativeLibraryPathResolver |
| 10 | + { |
| 11 | + static readonly HashSet<string> nativeLibraries = new HashSet<string> { "debian.9-x64", "fedora-x64", "linux-x64", "osx", "rhel-x64", "win-x64", "win-x86" }; |
| 12 | + |
| 13 | + public static string GetNativeLibraryDefaultPath() |
| 14 | + { |
| 15 | + var runtimeIdentifier = RuntimeEnvironment.GetRuntimeIdentifier(); |
| 16 | + var graph = BuildRuntimeGraph(); |
| 17 | + |
| 18 | + var compatibleRuntimeIdentifiers = graph.GetCompatibleRuntimeIdentifiers(runtimeIdentifier); |
| 19 | + |
| 20 | + return GetNativeLibraryPath(compatibleRuntimeIdentifiers); |
| 21 | + } |
| 22 | + |
| 23 | + private static Graph BuildRuntimeGraph() |
| 24 | + { |
| 25 | + var assembly = Assembly.GetExecutingAssembly(); |
| 26 | + var resourceName = "runtime.json"; |
| 27 | + |
| 28 | + var rids = new Dictionary<string, Runtime>(); |
| 29 | + |
| 30 | + using (var stream = assembly.GetManifestResourceStream(resourceName)) |
| 31 | + using (var reader = new StreamReader(stream)) |
| 32 | + { |
| 33 | + var result = reader.ReadToEnd(); |
| 34 | + var json = (JsonObject)SimpleJson.SimpleJson.DeserializeObject(result); |
| 35 | + |
| 36 | + var runtimes = (JsonObject)json["runtimes"]; |
| 37 | + |
| 38 | + foreach (var runtime in runtimes) |
| 39 | + { |
| 40 | + var imports = (JsonArray)((JsonObject)runtime.Value)["#import"]; |
| 41 | + |
| 42 | + var importedRuntimeIdentifiers = new List<string>(); |
| 43 | + |
| 44 | + foreach (var import in imports) |
| 45 | + { |
| 46 | + importedRuntimeIdentifiers.Add((string)import); |
| 47 | + } |
| 48 | + |
| 49 | + rids.Add(runtime.Key, new Runtime(runtime.Key, importedRuntimeIdentifiers)); |
| 50 | + } |
| 51 | + } |
| 52 | + |
| 53 | + return new Graph(rids); |
| 54 | + } |
| 55 | + |
| 56 | + private static string GetNativeLibraryPath(List<string> runtimeIdentifiers) |
| 57 | + { |
| 58 | + foreach (var runtimeIdentifier in runtimeIdentifiers) |
| 59 | + { |
| 60 | + if (nativeLibraries.Contains(runtimeIdentifier)) |
| 61 | + { |
| 62 | + return Path.Combine(GetExecutingAssemblyDirectory(), "runtimes", runtimeIdentifier, "native"); |
| 63 | + } |
| 64 | + } |
| 65 | + |
| 66 | + return null; |
| 67 | + } |
| 68 | + |
| 69 | + private static string GetExecutingAssemblyDirectory() |
| 70 | + { |
| 71 | + // Assembly.CodeBase is not actually a correctly formatted |
| 72 | + // URI. It's merely prefixed with `file:///` and has its |
| 73 | + // backslashes flipped. This is superior to EscapedCodeBase, |
| 74 | + // which does not correctly escape things, and ambiguates a |
| 75 | + // space (%20) with a literal `%20` in the path. Sigh. |
| 76 | + var managedPath = Assembly.GetExecutingAssembly().CodeBase; |
| 77 | + |
| 78 | + if (managedPath == null) |
| 79 | + { |
| 80 | + managedPath = Assembly.GetExecutingAssembly().Location; |
| 81 | + } |
| 82 | + else if (managedPath.StartsWith("file:///")) |
| 83 | + { |
| 84 | + managedPath = managedPath.Substring(8).Replace('/', '\\'); |
| 85 | + } |
| 86 | + else if (managedPath.StartsWith("file://")) |
| 87 | + { |
| 88 | + managedPath = @"\\" + managedPath.Substring(7).Replace('/', '\\'); |
| 89 | + } |
| 90 | + |
| 91 | + managedPath = Path.GetDirectoryName(managedPath); |
| 92 | + |
| 93 | + return managedPath; |
| 94 | + } |
| 95 | + |
| 96 | + class Runtime |
| 97 | + { |
| 98 | + public string RuntimeIdentifier { get; } |
| 99 | + |
| 100 | + public List<string> ImportedRuntimeIdentifiers { get; } |
| 101 | + |
| 102 | + public Runtime(string runtimeIdentifier, List<string> importedRuntimeIdentifiers) |
| 103 | + { |
| 104 | + RuntimeIdentifier = runtimeIdentifier; |
| 105 | + ImportedRuntimeIdentifiers = importedRuntimeIdentifiers; |
| 106 | + } |
| 107 | + } |
| 108 | + |
| 109 | + class Graph |
| 110 | + { |
| 111 | + readonly Dictionary<string, Runtime> runtimes; |
| 112 | + |
| 113 | + public Graph(Dictionary<string, Runtime> runtimes) |
| 114 | + { |
| 115 | + this.runtimes = runtimes; |
| 116 | + } |
| 117 | + |
| 118 | + public List<string> GetCompatibleRuntimeIdentifiers(string runtimeIdentifier) |
| 119 | + { |
| 120 | + var result = new List<string>(); |
| 121 | + |
| 122 | + if (runtimes.TryGetValue(runtimeIdentifier, out var initialRuntime)) |
| 123 | + { |
| 124 | + var queue = new Queue<Runtime>(); |
| 125 | + var hash = new HashSet<string>(); |
| 126 | + |
| 127 | + hash.Add(runtimeIdentifier); |
| 128 | + queue.Enqueue(initialRuntime); |
| 129 | + |
| 130 | + while (queue.Count > 0) |
| 131 | + { |
| 132 | + var runtime = queue.Dequeue(); |
| 133 | + result.Add(runtime.RuntimeIdentifier); |
| 134 | + |
| 135 | + foreach (var item in runtime.ImportedRuntimeIdentifiers) |
| 136 | + { |
| 137 | + if (hash.Add(item)) |
| 138 | + { |
| 139 | + queue.Enqueue(runtimes[item]); |
| 140 | + } |
| 141 | + } |
| 142 | + } |
| 143 | + } |
| 144 | + else |
| 145 | + { |
| 146 | + result.Add(runtimeIdentifier); |
| 147 | + } |
| 148 | + |
| 149 | + return result; |
| 150 | + } |
| 151 | + } |
| 152 | + } |
| 153 | +} |
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