packagefs: Automatic package attributes for packages symlinks

Add automatically generated attributes "SYS:PACKAGE" and
"SYS:PACKAGE_FILE" to the /packages/... directories and symlinks.

src/add-ons/kernel/file_systems/packagefs/package_links/PackageLinkDirectory.cpp

@@ -12,6 +12,7 @@
 
 #include <AutoDeleter.h>
 
+#include "AutoPackageAttributeDirectoryCookie.h"
 #include "DebugSupport.h"
 #include "PackageLinksListener.h"
 #include "StringConstants.h"
@@ -71,6 +72,36 @@ PackageLinkDirectory::ModifiedTime() const
 	return fModifiedTime;
 }
 
+
+status_t
+PackageLinkDirectory::OpenAttributeDirectory(AttributeDirectoryCookie*& _cookie)
+{
+	Package* package = fPackages.Head();
+	if (package == NULL)
+		return B_ENTRY_NOT_FOUND;
+
+	AutoPackageAttributeDirectoryCookie* cookie = new(std::nothrow)
+		AutoPackageAttributeDirectoryCookie();
+	if (cookie == NULL)
+		return B_NO_MEMORY;
+
+	_cookie = cookie;
+	return B_OK;
+}
+
+
+status_t
+PackageLinkDirectory::OpenAttribute(const StringKey& name, int openMode,
+	AttributeCookie*& _cookie)
+{
+	Package* package = fPackages.Head();
+	if (package == NULL)
+		return B_ENTRY_NOT_FOUND;
+
+	return AutoPackageAttributes::OpenCookie(package, name, openMode, _cookie);
+}
+
+
 void
 PackageLinkDirectory::AddPackage(Package* package,
 	PackageLinksListener* listener)

src/add-ons/kernel/file_systems/packagefs/package_links/PackageLinkDirectory.h

@@ -24,6 +24,11 @@ public:
 
 	virtual	timespec			ModifiedTime() const;
 
+	virtual	status_t			OpenAttributeDirectory(
+									AttributeDirectoryCookie*& _cookie);
+	virtual	status_t			OpenAttribute(const StringKey& name,
+									int openMode, AttributeCookie*& _cookie);
+
 			void				AddPackage(Package* package,
 									PackageLinksListener* listener);
 			void				RemovePackage(Package* package,

src/add-ons/kernel/file_systems/packagefs/package_links/PackageLinkSymlink.cpp

@@ -10,6 +10,7 @@
 
 #include <NodeMonitor.h>
 
+#include "AutoPackageAttributeDirectoryCookie.h"
 #include "DebugSupport.h"
 #include "NodeListener.h"
 #include "PackageLinksListener.h"
@@ -79,6 +80,7 @@ private:
 PackageLinkSymlink::PackageLinkSymlink(Package* package, Type type)
 	:
 	Node(0),
+	fPackage(),
 	fLinkPath(kUnknownLinkTarget),
 	fType(type)
 {
@@ -96,6 +98,8 @@ PackageLinkSymlink::Update(Package* package, PackageLinksListener* listener)
 {
 	OldAttributes oldAttributes(fModifiedTime, FileSize());
 
+	fPackage = package;
+
 	if (package != NULL) {
 		fLinkPath = package->InstallPath();
 		if (fLinkPath[0] != '\0') {
@@ -161,3 +165,27 @@ PackageLinkSymlink::ReadSymlink(void* buffer, size_t* bufferSize)
 
 	return B_OK;
 }
+
+
+status_t
+PackageLinkSymlink::OpenAttributeDirectory(AttributeDirectoryCookie*& _cookie)
+{
+	AutoPackageAttributeDirectoryCookie* cookie = new(std::nothrow)
+		AutoPackageAttributeDirectoryCookie();
+	if (cookie == NULL)
+		return B_NO_MEMORY;
+
+	_cookie = cookie;
+	return B_OK;
+}
+
+
+status_t
+PackageLinkSymlink::OpenAttribute(const StringKey& name, int openMode,
+	AttributeCookie*& _cookie)
+{
+	if (fPackage.Get() == NULL)
+		return B_ENTRY_NOT_FOUND;
+
+	return AutoPackageAttributes::OpenCookie(fPackage, name, openMode, _cookie);
+}

src/add-ons/kernel/file_systems/packagefs/package_links/PackageLinkSymlink.h

@@ -40,11 +40,17 @@ public:
 
 	virtual	status_t			ReadSymlink(void* buffer, size_t* bufferSize);
 
+	virtual	status_t			OpenAttributeDirectory(
+									AttributeDirectoryCookie*& _cookie);
+	virtual	status_t			OpenAttribute(const StringKey& name,
+									int openMode, AttributeCookie*& _cookie);
+
 private:
 			struct OldAttributes;
 
 private:
 			timespec			fModifiedTime;
+			BReference<Package>	fPackage;
 			const char*			fLinkPath;
 			Type				fType;
 };