private static void FindExtension()
{
if (_looked)
{
return;
}
bool hasDependencyContext;
try
{
hasDependencyContext = DependencyContext.Default != null;
}
catch (Exception ex) // Work around dotnet/core-setup#4556
{
Debug.Fail(ex.ToString());
hasDependencyContext = false;
}
if (hasDependencyContext)
{
var candidateAssets = new Dictionary <(string, string), int>();
var rid = RuntimeInformation.RuntimeIdentifier;
var rids = DependencyContext.Default !.RuntimeGraph.FirstOrDefault(g => g.Runtime == rid)?.Fallbacks.ToList()
?? new List <string?>();
rids.Insert(0, rid);
foreach (var library in DependencyContext.Default.RuntimeLibraries)
{
foreach (var group in library.NativeLibraryGroups)
{
foreach (var file in group.RuntimeFiles)
{
if (string.Equals(
Path.GetFileName(file.Path),
"mod_spatialite" + SharedLibraryExtension,
StringComparison.OrdinalIgnoreCase))
{
var fallbacks = rids.IndexOf(group.Runtime);
if (fallbacks != -1 && library.Path is not null)
{
candidateAssets.Add((library.Path, file.Path), fallbacks);
}
}
}
}
}
var assetPath = candidateAssets.OrderBy(p => p.Value)
.Select(p => p.Key).FirstOrDefault();
if (assetPath != default)
{
string?assetDirectory;
if (File.Exists(Path.Combine(AppContext.BaseDirectory, assetPath.Item2)))
{
// NB: This enables framework-dependent deployments
assetDirectory = Path.Combine(
AppContext.BaseDirectory,
Path.GetDirectoryName(assetPath.Item2.Replace('/', Path.DirectorySeparatorChar)) !);
}
else
{
string?assetFullPath = null;
var probingDirectories = ((string)AppDomain.CurrentDomain.GetData("PROBING_DIRECTORIES") !)
.Split(Path.PathSeparator);
foreach (var directory in probingDirectories)
{
var candidateFullPath = Path.Combine(
directory,
(assetPath.Item1 + "/" + assetPath.Item2).Replace('/', Path.DirectorySeparatorChar));
if (File.Exists(candidateFullPath))
{
assetFullPath = candidateFullPath;
}
}
Check.DebugAssert(assetFullPath != null, "assetFullPath is null");
assetDirectory = Path.GetDirectoryName(assetFullPath);
}
Check.DebugAssert(assetDirectory != null, "assetDirectory is null");
// GetEnvironmentVariable can sometimes return null when there is a race condition
// with another thread setting it. Therefore we do a bit of back off and retry here.
// Note that the result can be null if no path is set on the system.
var delay = 1;
var currentPath = Environment.GetEnvironmentVariable(PathVariableName !);
while (currentPath == null && delay < 1000)
{
Thread.Sleep(delay);
delay *= 2;
currentPath = Environment.GetEnvironmentVariable(PathVariableName !);
}
if (currentPath == null ||
!currentPath.Split(Path.PathSeparator).Any(
p => string.Equals(
p.TrimEnd(Path.DirectorySeparatorChar),
assetDirectory,
StringComparison.OrdinalIgnoreCase)))
{
Environment.SetEnvironmentVariable(
PathVariableName !,
assetDirectory + Path.PathSeparator + currentPath);
}
}
}
_looked = true;
}
