Name the generated HPKG files properly

* rule AddPackageFilesToHaikuImage: Add "flags" parameter. The only
  supported flag is "nameFromMetaInfo". It causes the packages to be
  copied under their canonical file name onto the image.
* Use the new flag for all generated packages save haiku_loader.hpkg.

build/jam/ImageRules

@@ -1009,14 +1009,26 @@ rule AddBootModuleSymlinksToHaikuImage targets
 		: $(targets) ;
 }
 
-rule AddPackageFilesToHaikuImage location : packages
+rule AddPackageFilesToHaikuImage location : packages : flags
 {
+	# AddPackageFilesToHaikuImage <location> : <packages> : <flags>
+	#
+	# Supported flags:
+	#	nameFromMetaInfo - determine the target file name from the package meta
+	#		info
+
 	packages = [ FFilterByBuildFeatures $(packages) ] ;
 	HAIKU_PACKAGES_IN_IMAGE on $(HAIKU_IMAGE_CONTAINER_NAME)
 		= [ on $(HAIKU_IMAGE_CONTAINER_NAME) return $(HAIKU_PACKAGES_IN_IMAGE) ]
 			$(packages) ;
 	HAIKU_PACKAGE_INSTALLATION_LOCATION on $(packages) = $(location) ;
-	AddFilesToHaikuImage $(location) packages : $(packages) ;
+
+	if nameFromMetaInfo in $(flags) {
+		AddFilesToHaikuImage $(location) packages : $(packages)
+			: packageFileName : computeName ;
+	} else {
+		AddFilesToHaikuImage $(location) packages : $(packages) ;
+	}
 }
 
 rule AddOptionalHaikuImagePackages packages

build/jam/OptionalPackages

@@ -146,6 +146,8 @@ if [ IsOptionalHaikuImagePackageAdded DevelopmentMin ]
 		haiku_devel.hpkg
 		haiku_$(TARGET_PACKAGING_ARCHS[2-])_devel.hpkg
 		makefile_engine.hpkg
+		:
+		nameFromMetaInfo
 		;
 }
 
@@ -271,7 +273,8 @@ if [ IsOptionalHaikuImagePackageAdded WebPositive ] {
 	for architectureObject in [ MultiArchSubDirSetup ] {
 		on $(architectureObject) {
 			if [ FIsBuildFeatureEnabled webpositive ] {
-				AddPackageFilesToHaikuImage system : webpositive.hpkg ;
+				AddPackageFilesToHaikuImage system : webpositive.hpkg
+					: nameFromMetaInfo ;
 				InstallOptionalHaikuImagePackage
 					$(baseURL)/WebPositiveBookmarks-2012-02-18.zip
 					: home config settings WebPositive ;
@@ -284,8 +287,9 @@ if [ IsOptionalHaikuImagePackageAdded WebPositive ] {
 
 # Welcome
 if [ IsOptionalHaikuImagePackageAdded Welcome ] {
-	AddPackageFilesToHaikuImage system : haiku_userguide.hpkg ;
+	AddPackageFilesToHaikuImage system : haiku_userguide.hpkg
-	AddPackageFilesToHaikuImage system : haiku_welcome.hpkg ;
+		: nameFromMetaInfo ;
+	AddPackageFilesToHaikuImage system : haiku_welcome.hpkg : nameFromMetaInfo ;
 
 	AddSymlinkToHaikuImage home Desktop	: /boot/system/bin/welcome
 		: Welcome ;

build/jam/images/HaikuImage

@@ -218,6 +218,8 @@ include [ FDirName $(HAIKU_BUILD_RULES_DIR) HaikuPackages ] ;
 AddPackageFilesToHaikuImage system :
 	haiku.hpkg
 	haiku_$(TARGET_PACKAGING_ARCHS[2-]).hpkg
+	:
+	nameFromMetaInfo
 	;
 AddPackageFilesToHaikuImage system : haiku_loader.hpkg ;
 

build/jam/images/HaikuImageBootstrap

@@ -175,6 +175,8 @@ include [ FDirName $(HAIKU_BUILD_RULES_DIR) HaikuPackages ] ;
 AddPackageFilesToHaikuImage system :
 	haiku.hpkg
 	haiku_$(TARGET_PACKAGING_ARCHS[2-]).hpkg
+	:
+	nameFromMetaInfo
 	;
 AddPackageFilesToHaikuImage system : haiku_loader.hpkg ;
 

build/scripts/build_haiku_image

@@ -219,6 +219,12 @@ downloadFile()
 }
 
 
+packageFileName()
+{
+	$package info -f "%fileName%" "$1"
+}
+
+
 mkdir -p $tmpDir
 copyrightsFile=$tmpDir/copyrights
 $rmAttrs -f $copyrightsFile