hpkg format: Add attribute for declaring post install scripts

headers/os/package/PackageInfo.h

@@ -90,6 +90,8 @@ public:
 			const BObjectList<BUser>& Users() const;
 			const BStringList&	Groups() const;
 
+			const BStringList&	PostInstallScripts() const;
+
 			const BObjectList<BPackageResolvable>&	ProvidesList() const;
 			const BObjectList<BPackageResolvableExpression>&
 								RequiresList() const;
@@ -145,6 +147,9 @@ public:
 			void				ClearGroups();
 			status_t			AddGroup(const BString& group);
 
+			void				ClearPostInstallScripts();
+			status_t			AddPostInstallScript(const BString& path);
+
 			void				ClearProvidesList();
 			status_t			AddProvides(const BPackageResolvable& provides);
 
@@ -278,6 +283,8 @@ private:
 			UserList			fUsers;
 			BStringList			fGroups;
 
+			BStringList			fPostInstallScripts;
+
 			ResolvableList		fProvidesList;
 
 			ResolvableExpressionList fRequiresList;

headers/os/package/PackageInfoAttributes.h

@@ -49,6 +49,8 @@ enum BPackageInfoAttributeID {
 								// list of (Unix) users defined/needed
 	B_PACKAGE_INFO_GROUPS,
 								// list of (Unix) groups defined/needed
+	B_PACKAGE_INFO_POST_INSTALL_SCRIPTS,
+								// list of scripts to be executed post-install
 	//
 	B_PACKAGE_INFO_ENUM_COUNT,
 };

headers/os/package/hpkg/PackageAttributes.h

@@ -77,3 +77,5 @@ B_DEFINE_HPKG_ATTRIBUTE(48, STRING,	"package:user.home",	PACKAGE_USER_HOME)
 B_DEFINE_HPKG_ATTRIBUTE(49, STRING,	"package:user.shell",	PACKAGE_USER_SHELL)
 B_DEFINE_HPKG_ATTRIBUTE(50, STRING,	"package:user.group",	PACKAGE_USER_GROUP)
 B_DEFINE_HPKG_ATTRIBUTE(51, STRING,	"package:group",		PACKAGE_GROUP)
+B_DEFINE_HPKG_ATTRIBUTE(52, STRING,	"package:post-install-script",
+	PACKAGE_POST_INSTALL_SCRIPT)