private async Task DownloadRepositoryActionAsync(IExecutionContext executionContext, ActionDownloadDetails actionDownloadDetails, string destDirectory)
{
//download and extract action in a temp folder and rename it on success
string tempDirectory = Path.Combine(HostContext.GetDirectory(WellKnownDirectory.Actions), "_temp_" + Guid.NewGuid());
Directory.CreateDirectory(tempDirectory);
#if OS_WINDOWS
string archiveFile = Path.Combine(tempDirectory, $"{Guid.NewGuid()}.zip");
#else
string archiveFile = Path.Combine(tempDirectory, $"{Guid.NewGuid()}.tar.gz");
#endif
string link = actionDownloadDetails.ArchiveLink;
Trace.Info($"Save archive '{link}' into {archiveFile}.");
try
{
int retryCount = 0;
// Allow up to 20 * 60s for any action to be downloaded from github graph.
int timeoutSeconds = 20 * 60;
while (retryCount < 3)
{
using (var actionDownloadTimeout = new CancellationTokenSource(TimeSpan.FromSeconds(timeoutSeconds)))
using (var actionDownloadCancellation = CancellationTokenSource.CreateLinkedTokenSource(actionDownloadTimeout.Token, executionContext.CancellationToken))
{
try
{
//open zip stream in async mode
using (FileStream fs = new FileStream(archiveFile, FileMode.Create, FileAccess.Write, FileShare.None, bufferSize: _defaultFileStreamBufferSize, useAsync: true))
using (var httpClientHandler = HostContext.CreateHttpClientHandler())
using (var httpClient = new HttpClient(httpClientHandler))
{
actionDownloadDetails.ConfigureAuthorization(executionContext, httpClient);
httpClient.DefaultRequestHeaders.UserAgent.AddRange(HostContext.UserAgents);
using (var response = await httpClient.GetAsync(link))
{
if (response.IsSuccessStatusCode)
{
using (var result = await response.Content.ReadAsStreamAsync())
{
await result.CopyToAsync(fs, _defaultCopyBufferSize, actionDownloadCancellation.Token);
await fs.FlushAsync(actionDownloadCancellation.Token);
// download succeed, break out the retry loop.
break;
}
}
else if (response.StatusCode == HttpStatusCode.NotFound)
{
// It doesn't make sense to retry in this case, so just stop
throw new ActionNotFoundException(new Uri(link));
}
else
{
// Something else bad happened, let's go to our retry logic
response.EnsureSuccessStatusCode();
}
}
}
}
catch (OperationCanceledException) when(executionContext.CancellationToken.IsCancellationRequested)
{
Trace.Info("Action download has been cancelled.");
throw;
}
catch (ActionNotFoundException)
{
Trace.Info($"The action at '{link}' does not exist");
throw;
}
catch (Exception ex) when(retryCount < 2)
{
retryCount++;
Trace.Error($"Fail to download archive '{link}' -- Attempt: {retryCount}");
Trace.Error(ex);
if (actionDownloadTimeout.Token.IsCancellationRequested)
{
// action download didn't finish within timeout
executionContext.Warning($"Action '{link}' didn't finish download within {timeoutSeconds} seconds.");
}
else
{
executionContext.Warning($"Failed to download action '{link}'. Error: {ex.Message}");
}
}
}
if (String.IsNullOrEmpty(Environment.GetEnvironmentVariable("_GITHUB_ACTION_DOWNLOAD_NO_BACKOFF")))
{
var backOff = BackoffTimerHelper.GetRandomBackoff(TimeSpan.FromSeconds(10), TimeSpan.FromSeconds(30));
executionContext.Warning($"Back off {backOff.TotalSeconds} seconds before retry.");
await Task.Delay(backOff);
}
}
ArgUtil.NotNullOrEmpty(archiveFile, nameof(archiveFile));
executionContext.Debug($"Download '{link}' to '{archiveFile}'");
var stagingDirectory = Path.Combine(tempDirectory, "_staging");
Directory.CreateDirectory(stagingDirectory);
#if OS_WINDOWS
ZipFile.ExtractToDirectory(archiveFile, stagingDirectory);
#else
string tar = WhichUtil.Which("tar", require: true, trace: Trace);
// tar -xzf
using (var processInvoker = HostContext.CreateService <IProcessInvoker>())
{
processInvoker.OutputDataReceived += new EventHandler <ProcessDataReceivedEventArgs>((sender, args) =>
{
if (!string.IsNullOrEmpty(args.Data))
{
Trace.Info(args.Data);
}
});
processInvoker.ErrorDataReceived += new EventHandler <ProcessDataReceivedEventArgs>((sender, args) =>
{
if (!string.IsNullOrEmpty(args.Data))
{
Trace.Error(args.Data);
}
});
int exitCode = await processInvoker.ExecuteAsync(stagingDirectory, tar, $"-xzf \"{archiveFile}\"", null, executionContext.CancellationToken);
if (exitCode != 0)
{
throw new NotSupportedException($"Can't use 'tar -xzf' extract archive file: {archiveFile}. return code: {exitCode}.");
}
}
#endif
// repository archive from github always contains a nested folder
var subDirectories = new DirectoryInfo(stagingDirectory).GetDirectories();
if (subDirectories.Length != 1)
{
throw new InvalidOperationException($"'{archiveFile}' contains '{subDirectories.Length}' directories");
}
else
{
executionContext.Debug($"Unwrap '{subDirectories[0].Name}' to '{destDirectory}'");
IOUtil.CopyDirectory(subDirectories[0].FullName, destDirectory, executionContext.CancellationToken);
}
Trace.Verbose("Create watermark file indicate action download succeed.");
string watermarkFile = GetWatermarkFilePath(destDirectory);
File.WriteAllText(watermarkFile, DateTime.UtcNow.ToString());
executionContext.Debug($"Archive '{archiveFile}' has been unzipped into '{destDirectory}'.");
Trace.Info("Finished getting action repository.");
}
finally
{
try
{
//if the temp folder wasn't moved -> wipe it
if (Directory.Exists(tempDirectory))
{
Trace.Verbose("Deleting action temp folder: {0}", tempDirectory);
IOUtil.DeleteDirectory(tempDirectory, CancellationToken.None); // Don't cancel this cleanup and should be pretty fast.
}
}
catch (Exception ex)
{
//it is not critical if we fail to delete the temp folder
Trace.Warning("Failed to delete temp folder '{0}'. Exception: {1}", tempDirectory, ex);
}
}
}
private async Task DownloadRepositoryActionAsync(IExecutionContext executionContext, Pipelines.ActionStep repositoryAction)
{
Trace.Entering();
ArgUtil.NotNull(executionContext, nameof(executionContext));
var repositoryReference = repositoryAction.Reference as Pipelines.RepositoryPathReference;
ArgUtil.NotNull(repositoryReference, nameof(repositoryReference));
if (string.Equals(repositoryReference.RepositoryType, Pipelines.PipelineConstants.SelfAlias, StringComparison.OrdinalIgnoreCase))
{
Trace.Info($"Repository action is in 'self' repository.");
return;
}
if (!string.Equals(repositoryReference.RepositoryType, Pipelines.RepositoryTypes.GitHub, StringComparison.OrdinalIgnoreCase))
{
throw new NotSupportedException(repositoryReference.RepositoryType);
}
ArgUtil.NotNullOrEmpty(repositoryReference.Name, nameof(repositoryReference.Name));
ArgUtil.NotNullOrEmpty(repositoryReference.Ref, nameof(repositoryReference.Ref));
string destDirectory = Path.Combine(HostContext.GetDirectory(WellKnownDirectory.Actions), repositoryReference.Name.Replace(Path.AltDirectorySeparatorChar, Path.DirectorySeparatorChar), repositoryReference.Ref);
string watermarkFile = GetWatermarkFilePath(destDirectory);
if (File.Exists(watermarkFile))
{
executionContext.Debug($"Action '{repositoryReference.Name}@{repositoryReference.Ref}' already downloaded at '{destDirectory}'.");
return;
}
else
{
// make sure we get a clean folder ready to use.
IOUtil.DeleteDirectory(destDirectory, executionContext.CancellationToken);
Directory.CreateDirectory(destDirectory);
executionContext.Output($"Download action repository '{repositoryReference.Name}@{repositoryReference.Ref}'");
}
var configurationStore = HostContext.GetService <IConfigurationStore>();
var isHostedServer = configurationStore.GetSettings().IsHostedServer;
if (isHostedServer)
{
string apiUrl = GetApiUrl(executionContext);
string archiveLink = BuildLinkToActionArchive(apiUrl, repositoryReference.Name, repositoryReference.Ref);
Trace.Info($"Download archive '{archiveLink}' to '{destDirectory}'.");
var downloadDetails = new ActionDownloadDetails(archiveLink, ConfigureAuthorizationFromContext);
await DownloadRepositoryActionAsync(executionContext, downloadDetails, destDirectory);
return;
}
else
{
string apiUrl = GetApiUrl(executionContext);
// URLs to try:
var downloadAttempts = new List <ActionDownloadDetails> {
// A built-in action or an action the user has created, on their GHES instance
// Example: https://my-ghes/api/v3/repos/my-org/my-action/tarball/v1
new ActionDownloadDetails(
BuildLinkToActionArchive(apiUrl, repositoryReference.Name, repositoryReference.Ref),
ConfigureAuthorizationFromContext),
// The same action, on GitHub.com
// Example: https://api.github.com/repos/my-org/my-action/tarball/v1
new ActionDownloadDetails(
BuildLinkToActionArchive(_dotcomApiUrl, repositoryReference.Name, repositoryReference.Ref),
configureAuthorization: (e, h) => { /* no authorization for dotcom */ })
};
foreach (var downloadAttempt in downloadAttempts)
{
Trace.Info($"Download archive '{downloadAttempt.ArchiveLink}' to '{destDirectory}'.");
try
{
await DownloadRepositoryActionAsync(executionContext, downloadAttempt, destDirectory);
return;
}
catch (ActionNotFoundException)
{
Trace.Info($"Failed to find the action '{repositoryReference.Name}' at ref '{repositoryReference.Ref}' at {downloadAttempt.ArchiveLink}");
continue;
}
}
throw new ActionNotFoundException($"Failed to find the action '{repositoryReference.Name}' at ref '{repositoryReference.Ref}'. Paths attempted: {string.Join(", ", downloadAttempts.Select(d => d.ArchiveLink))}");
}
}
