diff --git a/src/collection.cpp b/src/collection.cpp
index 2e339f6..5a015c5 100644
--- a/src/collection.cpp
+++ b/src/collection.cpp
@@ -5,6 +5,7 @@ constexpr std::string_view downloads("downloads");
 static const std::regex remote("(^https?):\\/\\/");
 
 Collection::Collection(
+    const std::filesystem::path& location,
     const std::filesystem::path& destination,
     const std::string& target,
     const std::shared_ptr<Logger>& logger,
@@ -16,8 +17,11 @@ Collection::Collection(
     destination(destination),
     target(target),
     taskManager(taskManager),
+    root(std::make_unique<Component>(location, shared_from_this(), logger)),
+    librariesPath(),
     knownSources(),
     successSources(),
+    pendingSources(),
     downloadingSources(),
     readingSources(),
     buildingSources()
@@ -29,16 +33,52 @@ Collection::Collection(
 
         throw e;
     }
+
+    root->read();
+    if (root->successfullyRead())
+        throw std::runtime_error("Error reading project in " + location.string());
+
+    if (root->getType() != Component::mason)
+        throw std::runtime_error("Project in " + location.string() + " doesn't seem to be a valid mason project");
+
+    librariesPath = root->getLibrariesPath();
+    std::lock_guard lock(mutex);
+    while (pendingSources.size() > 0) {
+        std::string source = pendingSources.front();
+        pendingSources.pop();
+        processSource(source);
+    }
+
+    taskManager->queue(
+        std::bind(&Component::build, root.get(), destination, target),
+        std::bind(&Collection::rootBuilt, this, std::placeholders::_1)
+    );
 }
 
 void Collection::addSource(const std::string& source) {
     std::lock_guard lock(mutex);
-    if (_hasSource(source)) {
+    std::pair<Sources::const_iterator, bool> result = knownSources.emplace(source);
+    if (!result.second) {
         major("Source " + source + " is already present, skipping as duplicate");
         return;
     }
 
     debug("Adding source " + source);
+    switch (root->getState()) {
+        case Component::initial:
+        case Component::reading:
+            pendingSources.emplace(source);
+            break;
+        case Component::ready:
+        case Component::building:
+        case Component::done:
+            processSource(source);
+        case Component::error:
+            throw std::runtime_error("Project in " + root->getLocation().string() + " doesn't seem to be a valid mason project");
+    }
+}
+
+void Collection::processSource(const std::string& source) {
     if (isRemote(source))
         queueDownload(source);
     else
@@ -62,7 +102,6 @@ void Collection::sourceDownaloded(const std::string& source, TaskManager::Error
 void Collection::sourceRead(const std::string& source, TaskManager::Error err) {
     std::lock_guard lock(mutex);
 
-    debug("Source " + source + " has been read");
     Components::iterator itr = readingSources.find(source);
     if (err.has_value()) {
         error("Coundn't read " + source + ": " + err.value()->what());
@@ -70,12 +109,18 @@ void Collection::sourceRead(const std::string& source, TaskManager::Error err) {
         return;
     }
 
-    debug("Queuing build of " + source);
+    if (itr->second->successfullyRead()) {
+        error("Source " + source + " had an error during read process, canceling build of this component");
+        readingSources.erase(itr);
+        return;
+    }
+
+    debug("Source " + source + " has been read, scheduling build");
     std::pair<Components::iterator, bool> res = buildingSources.emplace(source, std::move(itr->second));
     readingSources.erase(itr);
 
     taskManager->queue(
-        std::bind(&Component::build, res.first->second.get(), destination, target),
+        std::bind(&Component::build, res.first->second.get(), destination/librariesPath, target),
         std::bind(&Collection::sourceBuilt, this, source, std::placeholders::_1)
     );
 }
@@ -93,12 +138,16 @@ void Collection::sourceBuilt(const std::string& source, TaskManager::Error err)
     successSources.emplace(source);
 }
 
+void Collection::rootBuilt(TaskManager::Error err) {
+
+}
+
 bool Collection::isRemote(const std::string& source) {
     return std::regex_search(source, remote);
 }
 
 void Collection::queueDownload(const std::string& source) {
-    debug("Queuing download of " + source);
+    debug("Scheduling download of " + source);
     std::pair<Downloads::iterator, bool> res = downloadingSources.emplace(std::piecewise_construct,
         std::forward_as_tuple(source),
         std::forward_as_tuple(
@@ -113,7 +162,7 @@ void Collection::queueDownload(const std::string& source) {
 }
 
 void Collection::queueRead(const std::string& source, const std::filesystem::path& location) {
-    debug("Queuing read of " + source);
+    debug("Scheduling read of " + source);
     std::pair<Components::iterator, bool> res = readingSources.emplace(std::piecewise_construct,
         std::forward_as_tuple(source),
         std::forward_as_tuple(
@@ -132,6 +181,42 @@ bool Collection::hasSource(const std::string& source) const {
     return _hasSource(source);
 }
 
+unsigned int Collection::sourcesTotal() const {
+    std::lock_guard lock(mutex);
+    return _sourcesTotal();
+}
+
+unsigned int Collection::sourcesSuccess() const {
+    std::lock_guard lock(mutex);
+    return _sourcesSuccess();
+}
+
+unsigned int Collection::sourcesPending() const {
+    std::lock_guard lock(mutex);
+    return _sourcesPending();
+}
+
+unsigned int Collection::sourcesError() const {
+    std::lock_guard lock(mutex);
+    return _sourcesError();
+}
+
 bool Collection::_hasSource(const std::string& source) const {
     return knownSources.count(source) > 0;
 }
+
+unsigned int Collection::_sourcesTotal() const {
+    return knownSources.size();
+}
+
+unsigned int Collection::_sourcesSuccess() const {
+    return successSources.size();
+}
+
+unsigned int Collection::_sourcesPending() const {
+    return downloadingSources.size() + readingSources.size() + buildingSources.size() + pendingSources.size();
+}
+
+unsigned int Collection::_sourcesError() const {
+    return _sourcesTotal() - _sourcesPending() - _sourcesSuccess();
+}
diff --git a/src/collection.h b/src/collection.h
index 7aaaa44..0d555c7 100644
--- a/src/collection.h
+++ b/src/collection.h
@@ -8,6 +8,7 @@
 #include <string_view>
 #include <regex>
 #include <mutex>
+#include <queue>
 
 #include "loggable.h"
 #include "component.h"
@@ -16,11 +17,13 @@
 
 class Collection : protected Loggable, public std::enable_shared_from_this<Collection> {
     using Sources = std::set<std::string>;
+    using SourcesQueue = std::queue<std::string>;
     using Downloads = std::map<std::string, std::unique_ptr<Download>>;
     using Components = std::map<std::string, std::unique_ptr<Component>>;
 
 public:
     Collection(
+        const std::filesystem::path& location,
         const std::filesystem::path& destination,
         const std::string& target,
         const std::shared_ptr<Logger>& logger,
@@ -39,21 +42,30 @@ private:
     void sourceDownaloded(const std::string& source, TaskManager::Error err);
     void sourceRead(const std::string& source, TaskManager::Error err);
     void sourceBuilt(const std::string& source, TaskManager::Error err);
+    void rootBuilt(TaskManager::Error err);
 
     static bool isRemote(const std::string& source);
 
+    void processSource(const std::string& source);
     void queueDownload(const std::string& source);
     void queueRead(const std::string& source, const std::filesystem::path& location);
 
     bool _hasSource(const std::string& source) const;
+    unsigned int _sourcesTotal() const;
+    unsigned int _sourcesPending() const;
+    unsigned int _sourcesError() const;
+    unsigned int _sourcesSuccess() const;
 
 private:
     mutable std::mutex mutex;
     std::filesystem::path destination;
     std::string target;
     std::shared_ptr<TaskManager> taskManager;
+    std::unique_ptr<Component> root;
+    std::string librariesPath;
     Sources knownSources;
     Sources successSources;
+    SourcesQueue pendingSources;
     Downloads downloadingSources;
     Components readingSources;
     Components buildingSources;
diff --git a/src/component.cpp b/src/component.cpp
index bc337be..9f624dc 100644
--- a/src/component.cpp
+++ b/src/component.cpp
@@ -13,6 +13,13 @@ constexpr std::array<std::string_view, Component::done + 1> stringStates {
     "done"
 };
 
+constexpr std::array<std::string_view, Component::unknown + 1> stringTypes {
+    "file",
+    "directory",
+    "mason",
+    "unknown"
+};
+
 Component::Component(
     const std::filesystem::path& path,
     const std::weak_ptr<Collection>& collection,
@@ -23,7 +30,7 @@ Component::Component(
     type(unknown),
     collection(collection),
     location(path),
-    scenario(std::nullopt)
+    manifest(std::nullopt)
 {}
 
 void Component::read() {
@@ -56,65 +63,73 @@ void Component::tryReadingBuildScenarios() {
 }
 
 bool Component::readAsMason() {
-    std::filesystem::path masonScenarion = location/masonJSON;
+    std::filesystem::path masonManifest = location/masonJSON;
     try {
-        std::ifstream file(masonScenarion);
+        std::ifstream file(masonManifest);
         if (file.is_open())
-            scenario = nlohmann::json::parse(file);
+            manifest = nlohmann::json::parse(file);
         else
-            minor("Couldn't open " + masonScenarion.string());
+            minor("Couldn't open " + masonManifest.string());
     } catch (const nlohmann::json::exception& e) {
-        major("Couldn't parse " + masonScenarion.string());
+        major("Couldn't parse " + masonManifest.string());
     }
 
-    if (scenario.has_value()) {
-        const nlohmann::json& sc = scenario.value();
-        if (!sc.is_object())
-            return errorScenario(masonScenarion.string() + " is unexpected root type");
+    if (manifest.has_value()) {
+        const nlohmann::json& mnfst = manifest.value();
+        if (!mnfst.is_object())
+            return errorScenario(masonManifest.string() + " is unexpected root type");
 
-        nlohmann::json::const_iterator itr = sc.find(dependencies);
-        if (itr == sc.end()) {
-            info(masonScenarion.string() + " doesn't have dependencies");
+        nlohmann::json::const_iterator itr = mnfst.find(dependencies);
+        if (itr == mnfst.end()) {
+            info(masonManifest.string() + " doesn't have dependencies");
         } else {
             const nlohmann::json& deps = *itr;
-            if (!deps.is_array())
-                return errorScenario(masonScenarion.string() + " dependencies are not organized as an array");
-
-            for (const nlohmann::json& dep : deps) {
-                std::shared_ptr<Collection> col = collection.lock();
-                switch (dep.type()) {
-                    case nlohmann::json::value_t::string:
-                        col->addSource(dep);
-                        break;
-                    case nlohmann::json::value_t::object: {
-                        nlohmann::json::const_iterator ditr = dep.find("path");
-                        if (ditr == dep.end())
-                            return errorScenario(masonScenarion.string() + " object of unexpected format in dependecies");
-
-                        nlohmann::json path = *ditr;
-                        if (!path.is_string())
-                            return errorScenario(masonScenarion.string() + " object of unexpected format in dependecies");
-
-                        col->addSource(path);
-                    }
-                        break;
-                    default:
-                        return errorScenario(masonScenarion.string() + " has unexpected entries in dependecies");
-                }
-            }
+            if (!readMasonDependencies(deps, masonManifest))
+                return false;
         }
 
         type = mason;
-        info(location.string() + " seems to be a mason project");
+        info(location.string() + " seems to be a valid mason project");
         return true;
     }
 
     return false;
 }
 
+bool Component::readMasonDependencies(const nlohmann::json& deps, const std::string& manifestPath) {
+    if (!deps.is_array())
+        return errorScenario(manifestPath + " dependencies are not organized as an array");
+
+    for (const nlohmann::json& dep : deps) {
+        std::shared_ptr<Collection> col = collection.lock();
+        switch (dep.type()) {
+            case nlohmann::json::value_t::string:
+                col->addSource(dep);
+                break;
+            case nlohmann::json::value_t::object: {
+                nlohmann::json::const_iterator ditr = dep.find("path");
+                if (ditr == dep.end())
+                    return errorScenario(manifestPath + " object of unexpected format in dependecies");
+
+                nlohmann::json path = *ditr;
+                if (!path.is_string())
+                    return errorScenario(manifestPath + " object of unexpected format in dependecies");
+
+                col->addSource(path);
+            }
+                break;
+            default:
+                return errorScenario(manifestPath + " has unexpected entries in dependecies");
+        }
+    }
+
+    return true;
+}
+
+
 bool Component::errorScenario(const std::string& message) {
     major(message);
-    scenario = std::nullopt;
+    manifest = std::nullopt;
     return false;
     return false;
 }
@@ -124,11 +139,67 @@ void Component::build(const std::filesystem::path& destination, const std::strin
         throw WrongState(state, "build");
 
     state = building;
-
     info("Building " + location.string() + " to " + destination.string());
+
+    switch (type) {
+        case file:
+            buildAsFile(destination);
+            break;
+        case directory:
+            buildAsDiractory(destination);
+            break;
+        case mason:
+            buildAsMason(destination, target);
+            break;
+        default:
+            break;
+    }
+
     state = done;
 }
 
+void Component::buildAsFile(const std::filesystem::path& destination) {
+    std::filesystem::copy(location, destination/location.filename());
+}
+
+void Component::buildAsDiractory(const std::filesystem::path& destination) {
+    std::filesystem::copy(location, destination/location.filename(),
+                          std::filesystem::copy_options::recursive |
+                          std::filesystem::copy_options::overwrite_existing
+    );
+}
+
+std::string Component::getLibrariesPath() const {
+    //TODO may be it makes sence to cache
+    if (type != mason)
+        throw WrongType(type, "getLibrariesPath");
+
+    const nlohmann::json& mnfst = manifest.value();
+    nlohmann::json::const_iterator itr = mnfst.find("libraries");
+    if (itr == mnfst.end())
+        return "";
+
+    const nlohmann::json& libs = *itr;
+    if (libs.is_string())
+        return libs;
+
+    warn("Mason manifest " + (location/masonJSON).string()
+        + " has field \"libraries\" which is not string, ignoring it");
+    return "";
+}
+
+std::filesystem::path Component::getLocation() const {
+    return location;
+}
+
+bool Component::successfullyRead() const {
+    return state > reading && state != error;
+}
+
+void Component::buildAsMason(const std::filesystem::path& destination, const std::string& target) {
+    warn("mason build is not implemented yet");
+}
+
 Component::State Component::getState() const {
     return state;
 }
@@ -139,5 +210,10 @@ Component::Type Component::getType() const {
 
 Component::WrongState::WrongState(State state, const std::string& action):
     std::runtime_error("An attempt to perform action \"" + action
-                        + "\" on a wrong state \"" + stringStates[state].data() + '\"')
+                        + "\" on a wrong component state \"" + stringStates[state].data() + '\"')
+{}
+
+Component::WrongType::WrongType(Type type, const std::string& action):
+    std::runtime_error("An attempt to perform an action \"" + action
+                        + "\" on a wrong component type \"" + stringTypes[type].data() + '\"')
 {}
diff --git a/src/component.h b/src/component.h
index 2554e72..736d294 100644
--- a/src/component.h
+++ b/src/component.h
@@ -19,6 +19,7 @@ class Collection;
 class Component : protected Loggable {
 public:
     class WrongState;
+    class WrongType;
     enum State {
         initial,
         reading,
@@ -29,10 +30,10 @@ public:
     };
 
     enum Type {
-        unknown,
         file,
         directory,
-        mason
+        mason,
+        unknown
     };
 
     Component(
@@ -43,6 +44,9 @@ public:
 
     Type getType() const;
     State getState() const;
+    std::filesystem::path getLocation() const;
+    std::string getLibrariesPath() const;
+    bool successfullyRead() const;
 
     void read();
     void build(const std::filesystem::path& destination, const std::string& target);
@@ -52,15 +56,26 @@ private:
     bool readAsMason();
     bool errorScenario(const std::string& message);
 
+    void buildAsFile(const std::filesystem::path& destination);
+    void buildAsDiractory(const std::filesystem::path& destination);
+    void buildAsMason(const std::filesystem::path& destination, const std::string& target);
+
+    bool readMasonDependencies(const nlohmann::json& deps, const std::string& manifestPath);
+
 private:
     State state;
     Type type;
     std::weak_ptr<Collection> collection;
     std::filesystem::path location;
-    std::optional<nlohmann::json> scenario;
+    std::optional<nlohmann::json> manifest;
 };
 
 class Component::WrongState : public std::runtime_error {
 public:
     explicit WrongState(State state, const std::string& action);
 };
+
+class Component::WrongType : public std::runtime_error {
+public:
+    explicit WrongType(Type type, const std::string& action);
+};
diff --git a/src/download.cpp b/src/download.cpp
index 8b61c39..feeb69e 100644
--- a/src/download.cpp
+++ b/src/download.cpp
@@ -71,18 +71,16 @@ void Download::proceed() {
         const FileInfo& fl = file.value();
         std::optional<std::filesystem::path> path = downloadAsFile(fl);
         if (path.has_value()) {
-            bool success = true;
             info("Successfully downloaded " + url);
             if (fl.archive) {
                 info(url + " appears to be an archive, extracting");
-                success = extract(path.value(), destination/fl.name);
-                if (success)
+                bool success = extract(path.value(), destination/fl.name);
+                if (success) {
                     info("Successfully extracted " + url);
-            }
-
-            if (success) {
-                location = destination/fl.name;
-                return;
+                    location = destination/fl.name;
+                }
+            } else {
+                location = path;
             }
         }
 
diff --git a/src/main.cpp b/src/main.cpp
index 5a3f0e4..c15074d 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -20,25 +20,31 @@ int main(int argc, char *argv[]) {
 
     std::shared_ptr<Logger> logger = std::make_shared<Logger>(Logger::Severity::debug);
     std::shared_ptr<TaskManager> taskManager = std::make_shared<TaskManager>(logger);
-    std::shared_ptr<Collection> collection = std::make_shared<Collection>(secondArg, "", logger, taskManager);
+    std::shared_ptr<Collection> collection = std::make_shared<Collection>(
+        firstArg,
+        secondArg,
+        "",
+        logger,
+        taskManager
+    );
 
     taskManager->start();
-    collection->addSource(firstArg);
-
     taskManager->wait();
     taskManager->stop();
 
-    // int result = -1;
-    // if (success) {
-    //     root.info("successfully parsed project " + root.getName());
-    //     root.info("dependencies count is " + std::to_string(root.dependenciesCount()));
-    //
-    //     root.discover();
-    //     result = 0;
-    // }
-    //
-    // root.printLog();
+    unsigned int success = collection->sourcesSuccess();
+    unsigned int total = collection->sourcesTotal();
+    if (total == success) {
+        logger->log(Logger::Severity::info, "Successfully built " + firstArg);
+        return 0;
+    } else {
+        logger->log(Logger::Severity::error, "Failed to build " + firstArg);
+        logger->log(Logger::Severity::info, "Success: " + std::to_string(success));
+        logger->log(Logger::Severity::info, "Failed: " + std::to_string(collection->sourcesError()));
+        logger->log(Logger::Severity::info, "Unfinished: " + std::to_string(collection->sourcesPending()));
+        logger->log(Logger::Severity::info, "Total: " + std::to_string(total));
+        return -1;
+    }
 
-
-    return 0;
+    return -2;
 }
diff --git a/test/mason.json b/test/mason.json
index 2340e64..a4415fd 100644
--- a/test/mason.json
+++ b/test/mason.json
@@ -10,5 +10,6 @@
         },
         "https://git.macaw.me/blue/mason/archive/main.tar.gz",
         "https://git.macaw.me/blue/mason/raw/branch/main/src2/atomicmutex.h"
-    ]
+    ],
+    "libraries": "lib"
 }