1 files changed, 63 insertions, 0 deletions
diff --git a/system-build/functions/cache.sh b/system-build/functions/cache.sh
new file mode 100755
index 0000000..467a674
--- /dev/null
+++ b/system-build/functions/cache.sh
@@ -0,0 +1,63 @@
+#!/bin/sh
+
+## live-build(7) - System Build Scripts
+## Copyright (C) 2006-2015 Daniel Baumann <mail@daniel-baumann.ch>
+##
+## This program comes with ABSOLUTELY NO WARRANTY; for details see COPYING.
+## This is free software, and you are welcome to redistribute it
+## under certain conditions; see COPYING for details.
+
+
+Restore_cache ()
+{
+	DIRECTORY="${1}"
+
+	if [ "${LB_CACHE}" = "true" ] && [ "${LB_CACHE_PACKAGES}" = "true" ]
+	then
+		if [ -e "${DIRECTORY}" ]
+		then
+			# Restore old cache
+			if [ "$(stat --printf %d ${DIRECTORY}/)" = "$(stat --printf %d chroot/var/cache/apt/archives/)" ]
+			then
+				# with hardlinks
+				find "${DIRECTORY}" -name "*.deb" | xargs cp -fl -t chroot/var/cache/apt/archives
+			else
+				# without hardlinks
+				find "${DIRECTORY}" -name "*.deb" | xargs cp -t chroot/var/cache/apt/archives
+			fi
+		fi
+	fi
+}
+
+Save_cache ()
+{
+	DIRECTORY="${1}"
+
+	if [ "${LB_CACHE}" = "true" ] && [ "${LB_CACHE_PACKAGES}" = "true" ]
+	then
+		# Cleaning current cache
+		# In case of interrupted or incomplete builds, this may return an error,
+		# but we still do want to save the cache.
+		Chroot chroot "apt-get autoclean" || true
+
+		if ls chroot/var/cache/apt/archives/*.deb > /dev/null 2>&1
+		then
+			# Creating cache directory
+			mkdir -p "${DIRECTORY}"
+
+			# Saving new cache
+			for PACKAGE in chroot/var/cache/apt/archives/*.deb
+			do
+				if [ -e "${DIRECTORY}"/"$(basename ${PACKAGE})" ]
+				then
+					rm -f "${PACKAGE}"
+				else
+					mv "${PACKAGE}" "${DIRECTORY}"
+				fi
+			done
+		fi
+	else
+		# Purging current cache
+		rm -f chroot/var/cache/apt/archives/*.deb
+	fi
+}