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MigrationRunner.cs
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MigrationRunner.cs
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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.Diagnostics.Tracing;
using System.IO;
using System.Threading;
namespace NuGet.Common.Migrations
{
public static class MigrationRunner
{
private const string MaxMigrationFilename = "1";
public static void Run()
{
string migrationsDirectory = GetMigrationsDirectory();
Run(migrationsDirectory);
}
internal static void Run(string migrationsDirectory)
{
if (NuGetEventSource.IsEnabled) TraceEvents.RunStart();
var migrationPerformed = false;
var expectedMigrationFilename = Path.Combine(migrationsDirectory, MaxMigrationFilename);
try
{
if (!File.Exists(expectedMigrationFilename))
{
// Multiple processes or threads might be trying to call this concurrently (especially via NuGetSdkResolver)
// so use a global mutex and then check if someone else already did the work.
using (var mutex = new Mutex(false, "NuGet-Migrations"))
{
if (WaitForMutex(mutex))
{
try
{
Directory.CreateDirectory(migrationsDirectory);
// Only run migrations that have not already been run
if (!File.Exists(expectedMigrationFilename))
{
migrationPerformed = true;
Migration1.Run();
// Create file for the migration run, so that if an older version of NuGet is run, it doesn't try to run migrations again.
File.WriteAllText(expectedMigrationFilename, string.Empty);
}
}
catch { }
finally
{
mutex.ReleaseMutex();
}
}
}
}
}
finally
{
if (NuGetEventSource.IsEnabled) TraceEvents.RunStop(expectedMigrationFilename, migrationPerformed);
}
static bool WaitForMutex(Mutex mutex)
{
bool captured;
try
{
captured = mutex.WaitOne(TimeSpan.FromMinutes(1), false);
}
catch (AbandonedMutexException)
{
captured = true;
}
return captured;
}
}
internal static string GetMigrationsDirectory()
{
if (RuntimeEnvironmentHelper.IsWindows)
{
return Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "NuGet", "Migrations");
}
var XdgDataHome = Environment.GetEnvironmentVariable("XDG_DATA_HOME");
return string.IsNullOrEmpty(XdgDataHome)
? Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile), ".local", "share", "NuGet", "Migrations")
: Path.Combine(XdgDataHome, "NuGet", "Migrations");
}
private static class TraceEvents
{
private const string EventNameMigrationRun = "MigrationRunner/Run";
public static void RunStart()
{
var eventOptions = new EventSourceOptions
{
ActivityOptions = EventActivityOptions.Detachable,
Keywords = NuGetEventSource.Keywords.Common | NuGetEventSource.Keywords.Performance,
Opcode = EventOpcode.Start
};
NuGetEventSource.Instance.Write(EventNameMigrationRun, eventOptions);
}
public static void RunStop(string migrationFilePath, bool migrationPerformed)
{
var eventOptions = new EventSourceOptions
{
ActivityOptions = EventActivityOptions.Detachable,
Keywords = NuGetEventSource.Keywords.Common | NuGetEventSource.Keywords.Performance,
Opcode = EventOpcode.Stop
};
NuGetEventSource.Instance.Write(EventNameMigrationRun, eventOptions, new RunStopEventData(migrationFilePath, migrationPerformed));
}
[EventData]
private record struct RunStopEventData(string MigrationFileFullPath, bool MigrationPerformed);
}
}
}