Пример #1
0
        public IAsyncEnumerable <SoftwareIdentity> InstallPackage(SoftwareIdentity softwareIdentity, IHostApi requestObject)
        {
            if (requestObject == null)
            {
                throw new ArgumentNullException("requestObject");
            }

            if (softwareIdentity == null)
            {
                throw new ArgumentNullException("softwareIdentity");
            }

            // if the provider didn't say this was trusted, we should ask the user if it's ok.
            if (!softwareIdentity.FromTrustedSource)
            {
                try {
                    if (!requestObject.ShouldContinueWithUntrustedPackageSource(softwareIdentity.Name, softwareIdentity.Source))
                    {
                        requestObject.Warning(requestObject.FormatMessageString(Constants.Messages.UserDeclinedUntrustedPackageInstall, softwareIdentity.Name));
                        return(new EmptyAsyncEnumerable <SoftwareIdentity>());
                    }
                } catch {
                    return(new EmptyAsyncEnumerable <SoftwareIdentity>());
                }
            }

            return(new SoftwareIdentityRequestObject(this, requestObject ?? new object().As <IHostApi>(), request => Provider.InstallPackage(softwareIdentity.FastPackageReference, request), Constants.PackageStatus.Installed));
        }
        public IEnumerable <PackageProvider> SelectProviders(string providerName, IHostApi hostApi)
        {
            if (!string.IsNullOrWhiteSpace(providerName))
            {
                // match with wildcards
                var results = _packageProviders.Values.Where(each => each.ProviderName.IsWildcardMatch(providerName)).ReEnumerable();
                if (results.Any())
                {
                    return(results);
                }
                if (hostApi != null && !providerName.ContainsWildcards())
                {
                    // if the end user requested a provider that's not there. perhaps the bootstrap provider can find it.
                    if (RequirePackageProvider(null, providerName, Constants.MinVersion, hostApi))
                    {
                        // seems to think we found it.
                        if (_packageProviders.ContainsKey(providerName))
                        {
                            return(_packageProviders[providerName].SingleItemAsEnumerable());
                        }
                    }

                    // warn the user that that provider wasn't found.
                    hostApi.Warning(hostApi.FormatMessageString(Constants.Messages.UnknownProvider, providerName));
                }
                return(Enumerable.Empty <PackageProvider>());
            }

            return(PackageProviders);
        }
        /// <summary>
        ///     Searches for the assembly, interrogates it for it's providers and then proceeds to load
        /// </summary>
        /// <param name="request"></param>
        /// <param name="providerAssemblyName"></param>
        /// <returns></returns>
        internal bool TryToLoadProviderAssembly(string providerAssemblyName, IHostApi request)
        {
            request.Debug(request.FormatMessageString("Trying provider assembly: {0}", providerAssemblyName));

            var assemblyPath = FindAssembly(providerAssemblyName);

            if (assemblyPath != null)
            {
                try {
                    byte[] hash = null;
                    using (var stream = File.Open(assemblyPath, FileMode.Open, FileAccess.Read, FileShare.Read)) {
                        hash = System.Security.Cryptography.MD5.Create().ComputeHash(stream);
                    }
                    lock (_providerFiles) {
                        if (_providerFiles.ContainsKey(assemblyPath))
                        {
                            // have we tried this file before?
                            if (_providerFiles[assemblyPath].SequenceEqual(hash))
                            {
                                // and it's the exact same file?
                                request.Debug(request.FormatMessageString("Skipping previously processed assembly: {0}", assemblyPath));
                                return(false);
                            }
                            request.Debug(request.FormatMessageString("New assembly in location: {0}", assemblyPath));
                            // it's a different file in the same path?
                            // we're gonna let it try the new file.
                            _providerFiles.Remove(assemblyPath);
                        }
                        else
                        {
                            request.Debug(request.FormatMessageString("Attempting loading of assembly: {0}", assemblyPath));
                        }

                        // record that this file is being loaded.
                        _providerFiles.Add(assemblyPath, hash);
                    }
                    if (AcquireProviders(assemblyPath, request))
                    {
                        request.Debug(request.FormatMessageString("SUCCESS provider assembly: {0}", providerAssemblyName));
                        return(true);
                    }
                } catch (Exception e) {
                    e.Dump();

                    lock (_providerFiles) {
                        // can't create hash from file?
                        // we're not going to try and load this.
                        // all we can do is record the name.
                        if (!_providerFiles.ContainsKey(assemblyPath))
                        {
                            _providerFiles.Add(assemblyPath, new byte[0]);
                        }
                    }
                }
            }
            request.Debug(request.FormatMessageString("FAILED provider assembly: {0}", providerAssemblyName));
            return(false);
        }
Пример #4
0
        /// <summary>
        ///     Searches for the assembly, interrogates it for it's providers and then proceeds to load
        /// </summary>
        /// <param name="request"></param>
        /// <param name="providerAssemblyName"></param>
        /// <returns></returns>
        public bool LoadProviderAssembly(IHostApi request, string providerAssemblyName) {
            request.Debug(request.FormatMessageString("Trying provider assembly: {0}", providerAssemblyName));

            var assemblyPath = FindAssembly(providerAssemblyName);
            if (assemblyPath != null) {

                try {
                    byte[] hash = null;
                    using (var stream = File.Open(assemblyPath, FileMode.Open, FileAccess.Read, FileShare.Read)) {
                        hash = MD5.Create().ComputeHash(stream);
                    }
                    lock (_providerFiles) {
                        if (_providerFiles.ContainsKey(assemblyPath)) {
                            // have we tried this file before?
                            if (_providerFiles[assemblyPath].SequenceEqual(hash)) {
                                // and it's the exact same file?
                                request.Debug(request.FormatMessageString("Skipping previously processed assembly: {0}", assemblyPath));
                                return false;
                            }
                            request.Debug(request.FormatMessageString("New assembly in location: {0}", assemblyPath));
                            // it's a different file in the same path? 
                            // we're gonna let it try the new file. 
                            _providerFiles.Remove(assemblyPath);
                        } else {
                            request.Debug(request.FormatMessageString("Attempting loading of assembly: {0}", assemblyPath));
                        }

                        // record that this file is being loaded.
                        _providerFiles.Add(assemblyPath, hash);
                    }
                    if (AcquireProviders(assemblyPath, request)) {
                        request.Debug(request.FormatMessageString("SUCCESS provider assembly: {0}", providerAssemblyName));
                        return true;
                    }
                } catch (Exception e) {
                    e.Dump();

                    lock (_providerFiles) {
                        // can't create hash from file? 
                        // we're not going to try and load this.
                        // all we can do is record the name.
                        if (!_providerFiles.ContainsKey(assemblyPath)) {
                            _providerFiles.Add(assemblyPath, new byte[0]);
                        }
                    }
                }
            }
            request.Debug(request.FormatMessageString("FAILED provider assembly: {0}", providerAssemblyName));
            return false;
        }
Пример #5
0
        private IMetaProvider GetMetaProviderObject(IHostApi requestObject) {
            if (_metaProviders.ContainsKey("powershell")) {
                var powerShellMetaProvider = _metaProviders["powershell"];
                if (powerShellMetaProvider != null) {
                    return powerShellMetaProvider;
                }
            }

            requestObject.Error(Constants.Messages.FailedPowerShellMetaProvider, ErrorCategory.InvalidOperation.ToString(), "LoadProvider", requestObject.FormatMessageString(Constants.Messages.FailedPowerShellMetaProvider));
            return null;
        }
Пример #6
0
        private PackageProvider ImportProvider(IHostApi request, string providerName, IMetaProvider powerShellMetaProvider)
        {


            //foreach (var providerName in providers)
            {
                //var matchedProviderName = provider.As<DefaultPackageProvider>().GetPackageProviderName();
                //TODO pass in Maxi, mini, and requiredVersion to LoadAvailableProvider
                var instance = powerShellMetaProvider.LoadAvailableProvider(request.As<IRequest>(), providerName);
                if (instance == null)
                {
                   return null;
                }

                //Register newly created provider
                if (typeof(IPackageProvider).CanDynamicCastFrom(instance))
                {

                    var packageProvider = RegisterPackageProvider(instance.As<IPackageProvider>(), providerName, String.Empty, request);

                    if (packageProvider != null)
                    {
                        packageProvider.ProviderPath = powerShellMetaProvider.GetProviderPath(providerName);
                        return packageProvider;
                    }
                }
                else
                {
                    //A provider is not found
                    request.Error(Constants.Messages.UnknownProvider, ErrorCategory.InvalidOperation.ToString(),
                        providerName, request.FormatMessageString(Constants.Messages.UnknownProvider, providerName));
                }
            }
        }
Пример #7
0
        private IEnumerable<PackageProvider> ImportPackageProviderViaName(IHostApi request, string providerName)
        {
            var powerShellMetaProvider = GetMetaProviderObject(request);
            if (powerShellMetaProvider == null) {
                yield break;
            }

            //var availableProvider = powerShellMetaProvider.GetAvailableLocallyProviders(request.As<IRequest>()).ReEnumerable();
            var availableProviderNames = powerShellMetaProvider.GetProviderNames(); //.ReEnumerable();

            if (!availableProviderNames.Any())
            {
                //No available providers.
                if (!String.IsNullOrWhiteSpace(providerName)) {
                    //Error out if a user specific -Name
                    request.Error(Constants.Messages.UnknownProvider, ErrorCategory.InvalidOperation.ToString(),
                        providerName, request.FormatMessageString(Constants.Messages.UnknownProvider, providerName));
                }
                yield break;
            }

            // a user inputs "-Name" property, we load the specific provider

            //Find if it exists in the available list
            var matches = availableProviderNames.Where(each => each.IsWildcardMatch(providerName)).ReEnumerable();
            if (!matches.Any()) {
                request.Error(Constants.Messages.UnknownProvider, ErrorCategory.InvalidOperation.ToString(),
                    providerName, request.FormatMessageString(Constants.Messages.UnknownProvider, providerName));
            }
            foreach (var match in matches) {


                //var matchedProviderName = match.As<DefaultPackageProvider>().GetPackageProviderName();

                yield return ImportProvider(request, match, powerShellMetaProvider);

                //var instance = powerShellMetaProvider.LoadAvailableProvider(request.As<IRequest>(), matchedProviderName);
                //if (instance == null) {
                //    yield break;
                //}

                ////Register newly created provider
                //if (typeof (IPackageProvider).CanDynamicCastFrom(instance)) {

                //    var packageProvider = RegisterPackageProvider(instance.As<IPackageProvider>(), String.Empty, request);

                //    if (packageProvider != null) {
                //        packageProvider.ProviderPath = powerShellMetaProvider.GetProviderPath(matchedProviderName);
                //        yield return packageProvider;
                //    }
                //} else {
                //    //A provider is not found
                //    request.Error(Constants.Messages.UnknownProvider, ErrorCategory.InvalidOperation.ToString(),
                //        providerName, request.FormatMessageString(Constants.Messages.UnknownProvider, providerName));
                //}
            }
        }
Пример #8
0
        /// <summary>
        /// Get available provider if -ListAvailable present;load a provider specified in providerName.
        /// </summary>
        /// <param name="request"></param>
        /// <param name="providerName">provider to be loaded.</param>
        /// <param name="powerShellMetaProvider"></param>
        private IEnumerable<PackageProvider> GetAvailableProvider(IHostApi request, string providerName, IMetaProvider powerShellMetaProvider)
        {
            var results = _packageProviders.Values.Where(each => each.ProviderName.IsWildcardMatch(providerName)).ReEnumerable();

            if (results.Any()) {
                //the provider is already loaded and tracked in the loaded master list: _packageProviders 
                yield break;
            }

            //Get available powershell providers
            var availableProviders = powerShellMetaProvider.GetAvailableLocallyProviders(request.As<IRequest>()).ReEnumerable();                        

            if (!availableProviders.Any()) {
                //No available providers.
                if (!String.IsNullOrWhiteSpace(providerName)) {
                    //Error out if a user specific -Name
                    request.Error(Constants.Messages.UnknownProvider, ErrorCategory.InvalidOperation.ToString(),
                        providerName, request.FormatMessageString(Constants.Messages.UnknownProvider, providerName));
                }
                yield break;
            }

            if (String.IsNullOrWhiteSpace(providerName)) {
                // "-Name" does not exist, we return all we can find
                foreach (var module in availableProviders) {
                    yield return new PackageProvider(module.As<DefaultPackageProvider>());
                }
            } else {
                //A user inputs both -Name and -ListAvailable


                var matches = powerShellMetaProvider.GetProviderNames().Where(each => each.IsWildcardMatch(providerName)).ReEnumerable();
                if (!matches.Any()) {
                    request.Error(Constants.Messages.UnknownProvider, ErrorCategory.InvalidOperation.ToString(),
                        providerName, request.FormatMessageString(Constants.Messages.UnknownProvider, providerName));
                }

                foreach (var match in matches) {
                    yield return new PackageProvider(powerShellMetaProvider.GetAvailableLocallyProvider(match).As<DefaultPackageProvider>());
                    //yield return new PackageProvider(availableProviders[match].As<DefaultPackageProvider>());
                }
            }
        }
Пример #9
0
        public bool RequirePackageProvider(string requestor, string packageProviderName, string minimumVersion, IHostApi hostApi) {
            // check if the package provider is already installed
            if (_packageProviders.ContainsKey(packageProviderName)) {
                var current = _packageProviders[packageProviderName].Version;
                if (current >= minimumVersion) {
                    return true;
                }
            }

            var currentCallCount = hostApi.CallCount;

            if (_lastCallCount >= currentCallCount) {
                // we've already been here this call.

                // are they asking for the same provider again?
                if (_providersTriedThisCall.Contains(packageProviderName)) {
                    hostApi.Debug("Skipping RequirePackageProvider -- tried once this call previously.");
                    return false;
                }
                // remember this in case we come back again.
                _providersTriedThisCall.Add(packageProviderName);
            } else {
                _lastCallCount = currentCallCount;
                _providersTriedThisCall = new HashSet<string> {
                    packageProviderName
                };
            }

            if (!hostApi.IsInteractive) {
                hostApi.Debug("Skipping RequirePackageProvider due to not interactive");
                // interactive indicates that the host can respond to queries -- this doesn't happen
                // in powershell during tab-completion.
                return false;
            }

            // no?
            // ask the bootstrap provider if there is a package provider with that name available.
            if (!_packageProviders.ContainsKey(packageProviderName)){
                return false;
            }
            var bootstrap = _packageProviders["Bootstrap"];
            if (bootstrap == null) {
                hostApi.Debug("Skipping RequirePackageProvider due to missing bootstrap provider");
                return false;
            }

            var pkg = bootstrap.FindPackage(packageProviderName, null, minimumVersion, null, hostApi).OrderByDescending(p =>  p, SoftwareIdentityVersionComparer.Instance).GroupBy(package => package.Name).ToArray();
            if (pkg.Length == 1) {
                // Yeah? Install it.
                var package = pkg[0].FirstOrDefault();
                var metaWithProviderType = package.Meta.FirstOrDefault(each => each.ContainsKey("providerType"));
                var providerType = metaWithProviderType == null ? "unknown" : metaWithProviderType.GetAttribute("providerType");
                var destination = providerType == "assembly" ? (AdminPrivilege.IsElevated ? SystemAssemblyLocation : UserAssemblyLocation) : String.Empty;
                var link = package.Links.FirstOrDefault(each => each.Relationship == "installationmedia");
                var location = String.Empty;
                if (link != null) {
                    location = link.HRef.ToString();
                }

                // what can't find an installationmedia link?
                // todo: what should we say here?
                if (hostApi.ShouldBootstrapProvider(requestor, package.Name, package.Version, providerType, location, destination)) {
                    var newRequest = hostApi.Extend<IHostApi>(new {
                        GetOptionValues = new Func<string, IEnumerable<string>>(key => {
                            if (key == "DestinationPath") {
                                return new[] {
                                    destination
                                };
                            }
                            return new string[0];
                        })
                    });
                    var packagesInstalled = bootstrap.InstallPackage(package, newRequest).LastOrDefault();
                    if (packagesInstalled == null) {
                        // that's sad.
                        hostApi.Error(Constants.Messages.FailedProviderBootstrap, ErrorCategory.InvalidOperation.ToString(), package.Name, hostApi.FormatMessageString(Constants.Messages.FailedProviderBootstrap, package.Name));
                        return false;
                    }
                    // so it installed something
                    // we must tell the plugin loader to reload the plugins again.
                    LoadProviders(hostApi);
                    return true;
                }
            }

            return false;
        }
Пример #10
0
        /// <summary>
        ///     Searches for the assembly, interrogates it for it's providers and then proceeds to load
        /// </summary>
        /// <param name="request"></param>
        /// <param name="providerAssemblyName"></param>
        /// <param name="shouldRefreshCache"></param>
        /// <returns></returns>
        internal bool LoadProviderAssembly(IHostApi request, string providerAssemblyName, bool shouldRefreshCache) {
            request.Debug(request.FormatMessageString("Trying provider assembly: {0}", providerAssemblyName));
            var assemblyPath = FindAssembly(providerAssemblyName);

            if (assemblyPath != null) {

                try {
                    byte[] hash = null;
                    using (var stream = File.Open(assemblyPath, FileMode.Open, FileAccess.Read, FileShare.Read)) {
                        hash = System.Security.Cryptography.MD5.Create().ComputeHash(stream);
                    }
                    lock (_providerFiles) {
                        if (_providerFiles.ContainsKey(assemblyPath)) {
                            // have we tried this file before?
                             //if the exactly same provider is loaded already, skip the processed assembly. 

                            if (_providerFiles[assemblyPath].SequenceEqual(hash) && !shouldRefreshCache) {
                                // and it's the exact same file?
                                request.Verbose(string.Format(CultureInfo.CurrentCulture, Resources.Messages.SkippingProcessedAssembly, assemblyPath));
                                return false;
                            }
                            // it's a different file in the same path? -force exists?
                            // we're gonna let it try the new file. 
                            _providerFiles.Remove(assemblyPath);                            
                        }

                        request.Debug(request.FormatMessageString("Attempting loading of assembly: {0}", assemblyPath)); 
                        // record that this file is being loaded.
                        _providerFiles.Add(assemblyPath, hash);
                    }
                    if (AcquireProviders(assemblyPath, request, shouldRefreshCache)) {
                        request.Debug(request.FormatMessageString("SUCCESS provider assembly: {0}", providerAssemblyName));
                        return true;
                    }
                } catch (Exception e) {
                    e.Dump();

                    lock (_providerFiles) {
                        // can't create hash from file? 
                        // we're not going to try and load this.
                        // all we can do is record the name.
                        if (!_providerFiles.ContainsKey(assemblyPath)) {
                            _providerFiles.Add(assemblyPath, new byte[0]);
                        }
                    }
                }
            }
            request.Debug(request.FormatMessageString("FAILED provider assembly: {0}", providerAssemblyName));
            return false;
        }
Пример #11
0
        public IEnumerable<PackageProvider> SelectProviders(string providerName, IHostApi hostApi)
        {
            if (!string.IsNullOrWhiteSpace(providerName)) {
                // match with wildcards
                var results = _packageProviders.Values.Where(each => each.ProviderName.IsWildcardMatch(providerName)).ReEnumerable();
                if (results.Any()) {
                    return results;
                }
                if (hostApi != null && !providerName.ContainsWildcards()) {
                    // if the end user requested a provider that's not there. perhaps the bootstrap provider can find it.
                    if (RequirePackageProvider(null, providerName, Constants.MinVersion, hostApi)) {
                        // seems to think we found it.
                        if (_packageProviders.ContainsKey(providerName)) {
                            return _packageProviders[providerName].SingleItemAsEnumerable();
                        }
                    }

                    // warn the user that that provider wasn't found.
                    hostApi.Warning(hostApi.FormatMessageString(Constants.Messages.UnknownProvider, providerName));
                }
                return Enumerable.Empty<PackageProvider>();
            }

            return PackageProviders;
        }
        public bool RequirePackageProvider(string requestor, string packageProviderName, string minimumVersion, IHostApi hostApi)
        {
            // check if the package provider is already installed
            if (_packageProviders.ContainsKey(packageProviderName))
            {
                var current = _packageProviders[packageProviderName].Version;
                if (current >= minimumVersion)
                {
                    return(true);
                }
            }

            var currentCallCount = hostApi.CallCount;

            if (_lastCallCount >= currentCallCount)
            {
                // we've already been here this call.

                // are they asking for the same provider again?
                if (_providersTriedThisCall.Contains(packageProviderName))
                {
                    hostApi.Debug("Skipping RequirePackageProvider -- tried once this call previously.");
                    return(false);
                }
                // remember this in case we come back again.
                _providersTriedThisCall.Add(packageProviderName);
            }
            else
            {
                _lastCallCount          = currentCallCount;
                _providersTriedThisCall = new HashSet <string> {
                    packageProviderName
                };
            }

            if (!hostApi.IsInteractive)
            {
                hostApi.Debug("Skipping RequirePackageProvider due to not interactive");
                // interactive indicates that the host can respond to queries -- this doesn't happen
                // in powershell during tab-completion.
                return(false);
            }

            // no?
            // ask the bootstrap provider if there is a package provider with that name available.
            var bootstrap = _packageProviders["Bootstrap"];

            if (bootstrap == null)
            {
                hostApi.Debug("Skipping RequirePackageProvider due to missing bootstrap provider");
                return(false);
            }

            var pkg = bootstrap.FindPackage(packageProviderName, null, minimumVersion, null, hostApi).OrderByDescending(p => p, SoftwareIdentityVersionComparer.Instance).GroupBy(package => package.Name).ToArray();

            if (pkg.Length == 1)
            {
                // Yeah? Install it.
                var package = pkg[0].FirstOrDefault();
                var metaWithProviderType = package.Meta.FirstOrDefault(each => each.ContainsKey("providerType"));
                var providerType         = metaWithProviderType == null ? "unknown" : metaWithProviderType.GetAttribute("providerType");
                var destination          = providerType == "assembly" ? (AdminPrivilege.IsElevated ? SystemAssemblyLocation : UserAssemblyLocation) : string.Empty;
                var link     = package.Links.FirstOrDefault(each => each.Relationship == "installationmedia");
                var location = string.Empty;
                if (link != null)
                {
                    location = link.HRef.ToString();
                }

                // what can't find an installationmedia link?
                // todo: what should we say here?
                if (hostApi.ShouldBootstrapProvider(requestor, package.Name, package.Version, providerType, location, destination))
                {
                    var newRequest = hostApi.Extend <IHostApi>(new {
                        GetOptionValues = new Func <string, IEnumerable <string> >(key => {
                            if (key == "DestinationPath")
                            {
                                return(new[] {
                                    destination
                                });
                            }
                            return(new string[0]);
                        })
                    });
                    var packagesInstalled = bootstrap.InstallPackage(package, newRequest).LastOrDefault();
                    if (packagesInstalled == null)
                    {
                        // that's sad.
                        hostApi.Error(Constants.Messages.FailedProviderBootstrap, ErrorCategory.InvalidOperation.ToString(), package.Name, hostApi.FormatMessageString(Constants.Messages.FailedProviderBootstrap, package.Name));
                        return(false);
                    }
                    // so it installed something
                    // we must tell the plugin loader to reload the plugins again.
                    LoadProviders(hostApi);
                    return(true);
                }
            }

            return(false);
        }
Пример #13
0
        /// <summary>
        ///     This initializes the provider registry with the list of package providers.
        ///     (currently a hardcoded list, soon, registry driven)
        /// </summary>
        /// <param name="request"></param>
        internal void LoadProviders(IHostApi request)
        {
            if (request == null)
            {
                throw new ArgumentNullException("request");
            }

            var baseDir = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);

            var providerAssemblies = (_initialized ? Enumerable.Empty <string>() : _defaultProviders)
                                     .Concat(GetProvidersFromRegistry(Registry.LocalMachine, "SOFTWARE\\MICROSOFT\\ONEGET"))
                                     .Concat(GetProvidersFromRegistry(Registry.CurrentUser, "SOFTWARE\\MICROSOFT\\ONEGET"))
                                     .Concat(AutoloadedAssemblyLocations.SelectMany(location => {
                if (Directory.Exists(location))
                {
                    return(Directory.EnumerateFiles(location).Where(each => !IsExcluded(each) && (each.EndsWith(".exe", StringComparison.CurrentCultureIgnoreCase) || each.EndsWith(".dll", StringComparison.CurrentCultureIgnoreCase))));
                }
                return(Enumerable.Empty <string>());
            }));

#if DEEP_DEBUG
            providerAssemblies = providerAssemblies.ToArray();

            foreach (var each in providerAssemblies)
            {
                request.Debug("possible assembly: {0}".format(each));
            }
#endif

            // find modules that have manifests
            // todo: expand this out to validate the assembly is ok for this instance of OneGet.
            providerAssemblies = providerAssemblies.Where(each => Manifest.LoadFrom(each).Any(manifest => Swidtag.IsSwidtag(manifest) && new Swidtag(manifest).IsApplicable(new Hashtable())));

            // add inbox assemblies (don't require manifests, because they are versioned with the core)

#if !COMMUNITY_BUILD
            // todo: these should just be strong-named references. for now, just load them from the same directory.
            providerAssemblies = providerAssemblies.Concat(new[] {
                Path.Combine(baseDir, "Microsoft.OneGet.MetaProvider.PowerShell.dll"),
                Path.Combine(baseDir, "Microsoft.OneGet.ArchiverProviders.dll"),
                Path.Combine(baseDir, "Microsoft.OneGet.CoreProviders.dll"),
                Path.Combine(baseDir, "Microsoft.OneGet.MsuProvider.dll"),
#if !CORE_CLR
                // can't load these providers here.
                Path.Combine(baseDir, "Microsoft.OneGet.MsiProvider.dll"),
#endif
            });
#endif

#if DEEP_DEBUG
            providerAssemblies = providerAssemblies.ToArray();

            foreach (var each in providerAssemblies)
            {
                request.Debug("possible assembly with manifest: {0}".format(each));
            }
#endif

            providerAssemblies = providerAssemblies.OrderByDescending(each => {
                try {
                    // try to get a version from the file first
                    return((ulong)(FourPartVersion)FileVersionInfo.GetVersionInfo(each));
                } catch {
                    // otherwise we can't make a distinction.
                    return((ulong)0);
                }
            });
            providerAssemblies = providerAssemblies.Distinct(new PathEqualityComparer(PathCompareOption.FileWithoutExtension));

#if BEFORE_WE_HAD_MANIFESTS
            // hack to make sure we don't load the old version of the nuget provider
            // when we have the ability to examine a plugin without dragging it into the
            // primary appdomain, this won't be needed.
            FourPartVersion minimumnugetversion = "2.8.3.6";

            providerAssemblies = providerAssemblies.Where(assemblyFile => {
                try {
                    if ("nuget-anycpu".EqualsIgnoreCase(Path.GetFileNameWithoutExtension(assemblyFile)) && ((FourPartVersion)FileVersionInfo.GetVersionInfo(assemblyFile)) < minimumnugetversion)
                    {
                        return(false);
                    }
                } catch {
                }
                return(true);
            });
#endif

            // there is no trouble with loading providers concurrently.
#if DEBUG
            providerAssemblies.SerialForEach(providerAssemblyName => {
#else
            providerAssemblies.ParallelForEach(providerAssemblyName => {
#endif
                try {
                    request.Debug(request.FormatMessageString("Trying provider assembly: {0}", providerAssemblyName));
                    if (TryToLoadProviderAssembly(providerAssemblyName, request))
                    {
                        request.Debug(request.FormatMessageString("SUCCESS provider assembly: {0}", providerAssemblyName));
                    }
                    else
                    {
                        request.Debug(request.FormatMessageString("FAILED provider assembly: {0}", providerAssemblyName));
                    }
                } catch {
                    request.Error(Constants.Messages.ProviderPluginLoadFailure, ErrorCategory.InvalidOperation.ToString(), providerAssemblyName, request.FormatMessageString(Constants.Messages.ProviderPluginLoadFailure, providerAssemblyName));
                }
            });
        }