Portage_Extension_Script

Portage overlays are really useful. But if you want a rather custom system, they're pretty hard to use. When packages get update, etc. you need to redo your overlay. But here's a patch to simplify making custom ebuilds:

--- usr/lib/portage/bin/ebuild.sh	2005-02-18 17:07:34.742019008 -0500
+++ usr/lib/portage/bin/ebuild.sh.new	2005-02-20 16:01:36.275220768 -0500
@@ -212,6 +212,121 @@
 	/usr/lib/portage/bin/portageq "$@"
 }
 
+extendscript_run() {
+	if hasq extendscript $FEATURES; then
+		ebuild_extension $1
+	else
+		$1
+	fi
+}
+
+if hasq extendscript $FEATURES; then
+	# Use the binary so we don't have to deal with aliases
+	revextendlist="$(/usr/bin/ls /etc/portage/extend/ | rev)"
+	extendlist="$(echo $revextendlist | rev)"
+
+	ees_inherit() {
+		source /etc/portage/extend/virtual.$@
+	}
+
+	ges_inherit() {
+		for inheritscript in $@; do
+			if ! hasq $inheritscript $ges_total; then
+				if [ -e /etc/portage/extend/global/$inheritscript ]; then
+					source /etc/portage/extend/global/$inheritscript
+					ges_total="$ges_total $inheritscript"
+				else
+					die "Global Extension Script $script not found"
+				fi
+			fi
+		done
+	}
+
+	for script in /etc/portage/extend/*; do
+		if [[ "`basename $script`" == "${CATEGORY}.${PF}" ||
+		"`basename $script`" == "${CATEGORY}.${PN}" ||
+		"`basename $script`" == "${CATEGORY}" ]]; then
+			source $script
+			break
+		fi
+	done
+
+	for script in $GES_SCRIPT; do
+		if ! hasq $script $ges_total; then
+			if [ -e /etc/portage/extend/global/$script ]; then
+				source /etc/portage/extend/global/$script
+				ges_total="$ges_total $script"
+			else
+				die "Global Extension Script $script not found"
+			fi
+		fi
+	done
+	
+	# Run the global extension function
+	global_extension() {
+		# 1 - Function Name: pkg_preinst
+
+		local functionbase="$(echo $1 | sed -e "s:^.*_::")"
+		local gesvariable="GES_$(echo $functionbase | tr "[a-z]" "[A-Z]")"
+
+		for script in $ges_total; do
+			if [ "$(eval echo \$${script}_${gesvariable})" == "extend" ]; then
+				${script}_ges_${functionbase}
+			fi
+		done
+	}
+	
+	# Run a function given the function name
+	ebuild_extension() {
+		# 1 - Function Name: pkg_preinst
+
+		local functionbase="$(echo $1 | sed -e "s:^.*_::")"
+		local eesvariable="EES_$(echo $functionbase | tr "[a-z]" "[A-Z]")"
+
+		# Ebuild, global, specific:	extend
+		# Ebuild, global:		undefined
+		# Global, specific:		override
+		# Global:			global
+		# Specific:			only
+		# Nothing:			void
+		
+		
+		# Not defined: Run ebuild, global
+		if [ -z "${!eesvariable}" ]; then
+			$1; global_extension $1
+			
+		# "void": Run nothing
+		elif [ "${!eesvariable}" == "void" ]; then
+			einfo "Skipping $functionbase"
+			
+		else
+			ebegin "Running $functionbase: ${!eesvariable}"
+			
+			# "extend": Run ebuild, global, specific
+			if [ "${!eesvariable}" == "extend" ]; then
+				$1; global_extension $1; ees_$functionbase;
+
+			# "override": Run global, specific
+			elif [ "${!eesvariable}" == "override" ]; then
+				global_extension $1; ees_$functionbase
+
+			# "global": Run global
+			elif [ "${!eesvariable}" == "global" ]; then
+				global_extension $1
+
+			# "only": Run specific
+			elif [ "${!eesvariable}" == "only" ]; then
+				ees_$functionbase
+
+			else
+				die "Illegal $eesvariable setting"
+			fi
+			eend $?
+		fi
+	}
+fi
+
+
 
 # ----------------------------------------------------------------------------
 # ----------------------------------------------------------------------------
@@ -464,7 +579,8 @@
 			--sysconfdir=/etc \
 			--localstatedir=/var/lib \
 			${EXTRA_ECONF} \
-			"$@"
+			"$@" \
+			${EES_ECONF}
 
 		if ! "${ECONF_SOURCE}/configure" \
 			--prefix=/usr \
@@ -475,7 +591,8 @@
 			--sysconfdir=/etc \
 			--localstatedir=/var/lib \
 			${EXTRA_ECONF} \
-			"$@" ; then
+			"$@" \
+			${EES_ECONF} ; then
 
 			if [ -s config.log ]; then
 				echo
@@ -678,7 +795,7 @@
 	install -m0700 -d "${WORKDIR}" || die "Failed to create dir '${WORKDIR}'"
 	[ -d "$WORKDIR" ] && cd "${WORKDIR}"
 	echo ">>> Unpacking source..."
-	src_unpack
+	extendscript_run "src_unpack"
 	touch "${BUILDDIR}/.unpacked" || die "IO Failure -- Failed 'touch .unpacked' in BUILDIR"
 	echo ">>> Source unpacked."
 	cd "$BUILDDIR"
@@ -1126,8 +1243,8 @@
 	# set IMAGE depending if this is a binary or compile merge
 	[ "${EMERGE_FROM}" == "binary" ] && IMAGE=${PKG_TMPDIR}/${PF}/bin \
 					|| IMAGE=${D}
-
-	pkg_preinst
+	
+	extendscript_run "pkg_preinst"
 
 	# hopefully this will someday allow us to get rid of the no* feature flags
 	# we don't want globbing for initial expansion, but afterwards, we do