#!/bin/sh

## live-build(7) - System Build Scripts
## Copyright (C) 2006-2010 Daniel Baumann <daniel@debian.org>
##
## live-build 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.


set -e

# Including common functions
. "${LB_BASE:-/usr/share/live/build}"/scripts/build.sh

# Setting static variables
DESCRIPTION="$(Echo 'manage /etc/apt/sources.list')"
HELP=""
USAGE="${PROGRAM} {install|remove} [--force]"

Arguments "${@}"

# Reading configuration files
Read_conffiles config/all config/common config/bootstrap config/chroot config/binary config/source
Set_defaults

# Requiring stage file
Require_stagefile .stage/config .stage/bootstrap

_LB_LOCAL_KEY_EMAIL="live-build-local-key@invalid"

case "${1}" in
	install)
		Echo_message "Configuring file /etc/apt/sources.list"

		# Checking stage file
		Check_stagefile .stage/chroot_sources

		# Checking lock file
		Check_lockfile .lock

		# Creating lock file
		Create_lockfile .lock

		# Restoring cache
		Restore_cache cache/packages_chroot

		# Configure custom sources.list

cat > chroot/etc/apt/sources.list << EOF
# /etc/apt/sources.list

deb ${LB_MIRROR_CHROOT} ${LB_DISTRIBUTION} ${LB_ARCHIVE_AREAS}
EOF

		if [ "${LB_SOURCE}" = "true" ]
		then
			echo "deb-src ${LB_MIRROR_CHROOT} ${LB_DISTRIBUTION} ${LB_ARCHIVE_AREAS}" >> chroot/etc/apt/sources.list
		fi

		if [ "${LB_SECURITY}" = "true" ]
		then
			case "${LB_MODE}" in
				ubuntu)
					echo "deb ${LB_MIRROR_CHROOT_SECURITY} ${LB_DISTRIBUTION}-security ${LB_ARCHIVE_AREAS}" >> chroot/etc/apt/sources.list

					if [ "${LB_SOURCE}" = "true" ]
					then
						echo "deb-src ${LB_MIRROR_CHROOT_SECURITY} ${LB_DISTRIBUTION}-security ${LB_ARCHIVE_AREAS}" >> chroot/etc/apt/sources.list
					fi
					;;

				*)
					if [ "${LB_DISTRIBUTION}" != "sid" ] && [ "${LB_DISTRIBUTION}" != "unstable" ]
					then
						echo "deb ${LB_MIRROR_CHROOT_SECURITY} ${LB_DISTRIBUTION}/updates ${LB_ARCHIVE_AREAS}" >> chroot/etc/apt/sources.list

						if [ "${LB_SOURCE}" = "true" ]
						then
							echo "deb-src ${LB_MIRROR_CHROOT_SECURITY} ${LB_DISTRIBUTION}/updates ${LB_ARCHIVE_AREAS}" >> chroot/etc/apt/sources.list
						fi
					fi
					;;
			esac
		fi

		if [ "${LB_VOLATILE}" = "true" ]
		then
			case "${LB_MODE}" in
				debian|debian-release)
					echo "deb ${LB_MIRROR_CHROOT_VOLATILE} ${LB_DISTRIBUTION}-volatile ${LB_ARCHIVE_AREAS}" >> chroot/etc/apt/sources.list

					if [ "${LB_SOURCE}" = "true" ]
					then
						echo "deb-src ${LB_MIRROR_CHROOT_VOLATILE} ${LB_DISTRIBUTION}-volatile ${LB_ARCHIVE_AREAS}" >> chroot/etc/apt/sources.list
					fi
					;;

				ubuntu)
					echo "deb ${LB_MIRROR_CHROOT_VOLATILE} ${LB_DISTRIBUTION}-updates ${LB_ARCHIVE_AREAS}" >> chroot/etc/apt/sources.list

					if [ "${LB_SOURCE}" = "true" ]
					then
						echo "deb-src ${LB_MIRROR_CHROOT_VOLATILE} ${LB_DISTRIBUTION}-updates ${LB_ARCHIVE_AREAS}" >> chroot/etc/apt/sources.list
					fi
					;;
			esac
		fi

		if [ "${LB_BACKPORTS}" = "true" ]
		then
			case "${LB_MODE}" in
				debian|debian-release)
					if [ "${LB_DISTRIBUTION}" != "sid" ] && [ "${LB_DISTRIBUTION}" != "unstable" ]
					then
						echo "deb ${LB_MIRROR_CHROOT_BACKPORTS} ${LB_DISTRIBUTION}-backports ${LB_ARCHIVE_AREAS}" >> chroot/etc/apt/sources.list

						if [ "${LB_SOURCE}" = "true" ]
						then
							echo "deb-src ${LB_MIRROR_CHROOT_BACKPORTS} ${LB_DISTRIBUTION}-backports ${LB_ARCHIVE_AREAS}" >> chroot/etc/apt/sources.list
						fi
					fi
					;;
			esac
		fi

		# Check local sources.list
		if Find_files config/chroot_sources/*.chroot
		then
			# Deconfigure (possibly) old sources.list snipplets
			if Find_files config/chroot_sources/*.binary
			then
				for FILE in config/chroot_sources/*.binary
				do
					rm -f "chroot/etc/apt/sources.list.d/$(basename ${FILE} .binary).list"
				done
			fi

			# Configure new sources.list snipplets
			for FILE in config/chroot_sources/*.chroot
			do
				cp "${FILE}" "chroot/etc/apt/sources.list.d/$(basename ${FILE} .chroot).list"
			done
		fi

		# Configure third-party repositories
		if [ -n "${LB_REPOSITORIES}" ]
		then
			for REPOSITORY in ${LB_REPOSITORIES}
			do
				# ubuntu workaround to allow using live.debian.net
				if [ "${LB_MODE}" = "ubuntu" ] && [ "${REPOSITORY}" = "live.debian.net" ]
				then
					_DISTRIBUTION="sid"
				else
					_DISTRIBUTION="${LB_DISTRIBUTION}"
				fi

				for PLACE in config/repositories "${LB_BASE}/repositories"
				do
					# Prefer repositories from the config tree
					# over the global ones.
					if ! ls "${PLACE}/${REPOSITORY}"* > /dev/null 2>&1
					then
						continue
					fi

					# Adding sources.list entries (chroot)
					if [ -e "${PLACE}/${REPOSITORY}.chroot" ]
					then
						sed -e "s|@DISTRIBUTION@|${_DISTRIBUTION}|g" \
						    -e "s|@ARCHIVE_AREAS@|${LB_ARCHIVE_AREAS}|g" \
						"${PLACE}/${REPOSITORY}.chroot" > \
						"chroot/etc/apt/sources.list.d/${REPOSITORY}.list"
					elif [ -e "${PLACE}/${REPOSITORY}" ]
					then
						sed -e "s|@DISTRIBUTION@|${_DISTRIBUTION}|g" \
						    -e "s|@ARCHIVE_AREAS@|${LB_ARCHIVE_AREAS}|g" \
						"${PLACE}/${REPOSITORY}" > \
						"chroot/etc/apt/sources.list.d/${REPOSITORY}.list"
					fi

					if [ "${LB_APT_SECURE}" != false ]
					then
						# Adding archive signing keys (chroot)
						if [ -e "${PLACE}/${REPOSITORY}.chroot.gpg" ]
						then
							cat "${PLACE}/${REPOSITORY}.chroot.gpg" | Chroot chroot "apt-key add -"
						elif [ -e "${PLACE}/${REPOSITORY}.gpg" ]
						then
							cat "${PLACE}/${REPOSITORY}.gpg" | Chroot chroot "apt-key add -"
						fi
					fi
				done
			done
		fi

		# Configure local package repository
		if Find_files config/chroot_local-packages/*.deb
		then
			rm -rf chroot/root/local-packages
			mkdir -p chroot/root/local-packages

			if [ "$(stat --printf %d config/chroot_local-packages)" = "$(stat --printf %d chroot/root/local-packages)" ]
			then
				CP_OPTIONS="-l"
			fi

			# Copy packages
			if Find_files config/chroot_local-packages/*_"${LB_ARCHITECTURE}".deb
			then
				for FILE in config/chroot_local-packages/*_"${LB_ARCHITECTURE}".deb
				do
					if [ -L "${FILE}" ]
					then
						cp -L config/chroot_local-packages/*_"${LB_ARCHITECTURE}".deb chroot/root/local-packages
					else
						cp ${CP_OPTIONS} config/chroot_local-packages/*_"${LB_ARCHITECTURE}".deb chroot/root/local-packages
					fi
				done
			fi

			if Find_files config/chroot_local-packages/*_all.deb
			then
				for FILE in config/chroot_local-packages/*_all.deb
				do
					if [ -L "${FILE}" ]
					then
						cp -L config/chroot_local-packages/*_all.deb chroot/root/local-packages
					else
						cp ${CP_OPTIONS} config/chroot_local-packages/*_all.deb chroot/root/local-packages
					fi
				done
			fi

			if Find_files chroot/root/local-packages/*.deb
			then
				# If we bootstrapped a minimal chroot, we need
				# to install apt-utils before we have have
				# completed all the indices.
				case "${LB_PACKAGES_LISTS}" in
					stripped|minimal)
						Chroot chroot "apt-get update"
						;;
				esac

				# Check depends
				Check_package chroot/usr/bin/apt-ftparchive apt-utils

				# Installing depends
				Install_package

				# Generate Packages and Packages.gz 
				echo "cd /root/local-packages && apt-ftparchive packages . > Packages" | Chroot chroot sh
				gzip -9 -c chroot/root/local-packages/Packages > chroot/root/local-packages/Packages.gz

				# Generate Release
				echo "cd /root/local-packages && apt-ftparchive \
					-o APT::FTPArchive::Release::Origin=chroot_local-packages \
					release . > Release" | Chroot chroot sh

				if [ "${LB_APT_SECURE}" = "true" ]
				then
					_LB_DOTGNUPG_EXISTED=0
					if [ -d chroot/root/.gnupg ]
					then
						_LB_DOTGNUPG_EXISTED=1
					fi

					# Ensure ~/.gnupg exists (required for gnupg >= ~1.4.9)
					mkdir -p chroot/root/.gnupg

					# Temporarily replace /dev/random with /dev/urandom so as not
					# to block automated image builds; we don't care about the
					# security of this key anyway.
					if [ -e chroot/dev/random ]
					then
						mv chroot/dev/random chroot/dev/random.orig
						cp -a chroot/dev/urandom chroot/dev/random
					fi

					if Find_files cache/local-package-keyring.*
					then
						cp cache/local-package-keyring.* chroot/root
					else
						# Generate temporary key
						echo "Key-Type: RSA
						      Key-Length: 1024
						      Subkey-Type: ELG-E
						      Subkey-Length: 1024
						      Name-Real: live-build local packages key
						      Name-Email: ${_LB_LOCAL_KEY_EMAIL}
						      Expire-Date: 0
						      %secring /root/local-package-keyring.sec
						      %pubring /root/local-package-keyring.pub
						      %commit" | Chroot chroot "gpg --batch --gen-key" || _LB_RET=${?}

						case "${_LB_RET}" in
							""|2)
								# Gnupg sometimes seems to return with a status of 2 when there was not
								# enough entropy (and key creation blocks temporarily) even if the
								# operation was ultimately successful.
								;;
							*)
								Echo_error "GPG exited with error status %s" "${_LB_RET}"
								exit ${_LB_RET}
								;;
						esac

						# Save keyrings to avoid regeneration
						cp chroot/root/local-package-keyring.* cache/
					fi

					# Sign release
					Chroot chroot "gpg --no-default-keyring --secret-keyring /root/local-package-keyring.sec \
						--keyring /root/local-package-keyring.pub -abs -o \
						/root/local-packages/Release.gpg /root/local-packages/Release"

					# Import key
					Chroot chroot "gpg --no-default-keyring --secret-keyring /root/local-package-keyring.sec \
						--keyring /root/local-package-keyring.pub --armor \
						--export ${_LB_LOCAL_KEY_EMAIL}" | Chroot chroot "apt-key add -"

					# Remove temporary keyrings
					rm chroot/root/local-package-keyring.pub
					rm chroot/root/local-package-keyring.sec

					# Revert /dev/random
					if [ -e chroot/dev/random.orig ]
					then
						mv chroot/dev/random.orig chroot/dev/random
					fi

					# Remove /root/.gnupg if we created it during the signing process
					if [ "${_LB_DOTGNUPG_EXISTED}" -eq 0 ]
					then
						rm -rf chroot/root/.gnupg
					fi
				fi

				# Add to sources.list.d
				echo "deb file:/root/local-packages ./" > chroot/etc/apt/sources.list.d/local-packages.list

				# Removing depends
				Remove_package
			else
				Echo_warning "Local packages must be named with suffix '_all.deb' or '_\$architecture.deb'."
			fi
		fi

		# Update indices from cache
		if [ "${LB_CACHE_INDICES}" = "true" ] && [ -d cache/indices_bootstrap ]
		then
			if Find_files cache/indices_bootstrap/secring.gpg*
			then
				cp -f cache/indices_bootstrap/secring.gpg* chroot/etc/apt
			fi

			if Find_files cache/indices_bootstrap/trusted.gpg*
			then
				cp -rf cache/indices_bootstrap/trusted.gpg* chroot/etc/apt
			fi

			if [ -f cache/indices_bootstrap/pkgcache.bin ]
			then
				cp -f cache/indices_bootstrap/pkgcache.bin chroot/var/cache/apt
			fi

			if [ -f cache/indices_bootstrap/srcpkgcache.bin ]
			then
				cp -f cache/indices_bootstrap/srcpkgcache.bin chroot/var/cache/apt
			fi

			if Find_files cache/indices_bootstrap/*_Packages
			then
				cp -f cache/indices_bootstrap/*_Packages chroot/var/lib/apt/lists
			fi

			if Find_files cache/indices_bootstrap/*_Sources
			then
				cp -f cache/indices_bootstrap/*_Sources chroot/var/lib/apt/lists
			fi

			if Find_files cache/indices_bootstrap/*_Release*
			then
				cp -f cache/indices_bootstrap/*_Release* chroot/var/lib/apt/lists
			fi

			if [ "${LB_APT}" = "aptitude" ] && [ ! -x /usr/bin/aptitude ]
			then
				Chroot chroot "apt-get ${APT_OPTIONS} install aptitude"
			fi
		else # Get fresh indices
			# Check local gpg keys
			if Find_files config/chroot_sources/*.chroot.gpg
			then
				for FILE in config/chroot_sources/*.chroot.gpg
				do
					cp ${FILE} chroot/root
					Chroot chroot "apt-key add /root/$(basename ${FILE})"
					rm -f chroot/root/$(basename ${FILE})
				done
			fi

			# Check local keyring packages
			if Find_files config/chroot_sources/*.deb
			then
				for PACKAGE in config/chroot_sources/*.deb
				do
					cp ${PACKAGE} chroot/root
					Chroot chroot "dpkg -i /root/$(basename ${PACKAGE})"
					rm -f chroot/root/$(basename ${PACKAGE})
				done
			fi

			# Installing aptitude
			if [ "${LB_APT}" = "aptitude" ] && [ ! -x /usr/bin/aptitude ]
			then
				Chroot chroot "apt-get ${APT_OPTIONS} update"
				Chroot chroot "apt-get ${APT_OPTIONS} install aptitude"
			fi

			Apt update
			Apt upgrade
			Apt dist-upgrade

			# Installing keyring packages
			if [ -n "${LB_KEYRING_PACKAGES}" ]
			then
				Chroot chroot "apt-get --yes --force-yes install ${LB_KEYRING_PACKAGES}"
				Apt update
			fi

			if [ "${LB_CACHE_INDICES}" = "true" ]
			then
				mkdir -p cache/indices_bootstrap

				cp -f chroot/etc/apt/secring.gpg* cache/indices_bootstrap
				cp -rf chroot/etc/apt/trusted.gpg* cache/indices_bootstrap

				cp -f chroot/var/cache/apt/pkgcache.bin cache/indices_bootstrap

				if Find_files chroot/var/cache/apt/srcpkgcache.bin
				then
					cp -f chroot/var/cache/apt/srcpkgcache.bin cache/indices_bootstrap
				fi

				cp -f chroot/var/lib/apt/lists/*_Packages cache/indices_bootstrap

				if Find_files chroot/var/lib/apt/lists/*_Sources
				then
					cp -f chroot/var/lib/apt/lists/*_Sources cache/indices_bootstrap
				fi

				cp -f chroot/var/lib/apt/lists/*_Release* cache/indices_bootstrap
			fi
		fi

		# Saving cache
		Save_cache cache/packages_chroot

		# Creating stage file
		Create_stagefile .stage/chroot_sources
		;;

	remove)
		Echo_message "Deconfiguring file /etc/apt/sources.list"

		# Checking lock file
		Check_lockfile .lock

		# Creating lock file
		Create_lockfile .lock

		# Configure generic indices
		# Don't do anything if it's not required
		if [ "${LB_MIRROR_CHROOT}" = "${LB_MIRROR_BINARY}" ] && \
		[ "${LB_MIRROR_CHROOT_SECURITY}" = "${LB_MIRROR_BINARY_SECURITY}" ] && \
		[ ! -d chroot/root/local-packages ]
		then
			# Removing stage file
			rm -f .stage/chroot_sources

			exit 0
		fi

		# Cleaning apt list cache
		rm -rf chroot/var/lib/apt/lists
		mkdir -p chroot/var/lib/apt/lists/partial

cat > chroot/etc/apt/sources.list << EOF
# /etc/apt/sources.list

deb ${LB_MIRROR_BINARY} ${LB_DISTRIBUTION} ${LB_ARCHIVE_AREAS}
EOF

		if [ "${LB_SOURCE}" = "true" ]
		then
			echo "deb-src ${LB_MIRROR_BINARY} ${LB_DISTRIBUTION} ${LB_ARCHIVE_AREAS}" >> chroot/etc/apt/sources.list
		fi

		if [ "${LB_SECURITY}" = "true" ]
		then
			case "${LB_MODE}" in
				ubuntu)
					echo "deb ${LB_MIRROR_BINARY_SECURITY} ${LB_DISTRIBUTION}-security ${LB_ARCHIVE_AREAS}" >> chroot/etc/apt/sources.list

					if [ "${LB_SOURCE}" = "true" ]
					then
						echo "deb-src ${LB_MIRROR_BINARY_SECURITY} ${LB_DISTRIBUTION}-security ${LB_ARCHIVE_AREAS}" >> chroot/etc/apt/sources.list
					fi
					;;

				*)
					if [ "${LB_DISTRIBUTION}" != "sid" ] && [ "${LB_DISTRIBUTION}" != "unstable" ]
					then
						echo "deb ${LB_MIRROR_BINARY_SECURITY} ${LB_DISTRIBUTION}/updates ${LB_ARCHIVE_AREAS}" >> chroot/etc/apt/sources.list

						if [ "${LB_SOURCE}" = "true" ]
						then
							echo "deb-src ${LB_MIRROR_BINARY_SECURITY} ${LB_DISTRIBUTION}/updates ${LB_ARCHIVE_AREAS}" >> chroot/etc/apt/sources.list
						fi
					fi
					;;
			esac
		fi

		if [ "${LB_VOLATILE}" = "true" ]
		then
			case "${LB_MODE}" in
				debian|debian-release)
					echo "deb ${LB_MIRROR_BINARY_VOLATILE} ${LB_DISTRIBUTION}-volatile ${LB_ARCHIVE_AREAS}" >> chroot/etc/apt/sources.list

					if [ "${LB_SOURCE}" = "true" ]
					then
						echo "deb-src ${LB_MIRROR_BINARY_VOLATILE} ${LB_DISTRIBUTION}/volatile ${LB_ARCHIVE_AREAS}" >> chroot/etc/apt/sources.list
					fi
					;;

				ubuntu)
					echo "deb ${LB_MIRROR_BINARY_VOLATILE} ${LB_DISTRIBUTION}-updates ${LB_ARCHIVE_AREAS}" >> chroot/etc/apt/sources.list

					if [ "${LB_SOURCE}" = "true" ]
					then
						echo "deb-src ${LB_MIRROR_BINARY_VOLATILE} ${LB_DISTRIBUTION}-updates ${LB_ARCHIVE_AREAS}" >> chroot/etc/apt/sources.list
					fi
					;;
			esac
		fi

		if [ "${LB_BACKPORTS}" = "true" ]
		then
			case "${LB_MODE}" in
				debian|debian-release)
					if [ "${LB_DISTRIBUTION}" != "sid" ] && [ "${LB_DISTRIBUTION}" != "unstable" ]
					then
						echo "deb ${LB_MIRROR_BINARY_BACKPORTS} ${LB_DISTRIBUTION}-backports ${LB_ARCHIVE_AREAS}" >> chroot/etc/apt/sources.list

						if [ "${LB_SOURCE}" = "true" ]
						then
							echo "deb-src ${LB_MIRROR_BINARY_BACKPORTS} ${LB_DISTRIBUTION}-backports ${LB_ARCHIVE_AREAS}" >> chroot/etc/apt/sources.list
						fi
					fi
					;;
			esac
		fi

		# Configure third-party repositories
		if [ -n "${LB_REPOSITORIES}" ]
		then
			for REPOSITORY in ${LB_REPOSITORIES}
			do
				# Removing sources.list entries (chroot)
				rm -f "chroot/etc/apt/sources.list.d/${REPOSITORY}.list"

				for PLACE in config/repositories "${LB_BASE}/repositories"
				do
					# Prefer repositories from the config tree
					# over the global ones.
					if ! ls "${PLACE}/${REPOSITORY}"* > /dev/null 2>&1
					then
						continue
					fi

					# Adding sources.list entries (binary)
					if [ -e "${PLACE}/${REPOSITORY}.binary" ]
					then
						sed -e "s|@DISTRIBUTION@|${LB_DISTRIBUTION}|g" \
						    -e "s|@ARCHIVE_AREAS@|${LB_ARCHIVE_AREAS}|g" \
						"${PLACE}/${REPOSITORY}.binary" > \
						"chroot/etc/apt/sources.list.d/${REPOSITORY}.list"
					elif [ -e "${PLACE}/${REPOSITORY}" ]
					then
						sed -e "s|@DISTRIBUTION@|${LB_DISTRIBUTION}|g" \
						    -e "s|@ARCHIVE_AREAS@|${LB_ARCHIVE_AREAS}|g" \
						"${PLACE}/${REPOSITORY}" > \
						"chroot/etc/apt/sources.list.d/${REPOSITORY}.list"
					fi

					if [ "${LB_APT_SECURE}" != false ]
					then
						# Adding archive signing keys (binary)
						if [ -e "${PLACE}/${REPOSITORY}.binary.gpg" ]
						then
							cat "${PLACE}/${REPOSITORY}.binary.gpg" | Chroot chroot "apt-key add -"
						elif [ -e "${PLACE}/${REPOSITORY}.gpg" ]
						then
							cat "${PLACE}/${REPOSITORY}.gpg" | Chroot chroot "apt-key add -"
						fi
					fi
				done
			done
		fi

		# Check local sources.list
		if Find_files config/chroot_sources/*.binary
		then
			# Deconfigure (possibly) old sources.list snipplets
			if Find_files config/chroot_sources/*.chroot
			then
			for FILE in config/chroot_sources/*.chroot
				do
					rm -f "chroot/etc/apt/sources.list.d/$(basename ${FILE} .chroot).list"
				done
			fi

			# Configure new sources.list snipplets
			for FILE in config/chroot_sources/*.binary
			do
				cp "${FILE}" "chroot/etc/apt/sources.list.d/$(basename ${FILE} .binary).list"
			done
		fi

		# Check local gpg keys
		if Find_files config/chroot_sources/*.binary.gpg
		then
			for FILE in config/chroot_sources/*.binary.gpg
			do
				cp ${FILE} chroot/root
				Chroot chroot "apt-key add /root/$(basename ${FILE})"
				rm -f chroot/root/$(basename ${FILE})
			done
		fi

		# Updating indices
		Apt update

		# Cleaning apt package cache
		rm -rf chroot/var/cache/apt
		mkdir -p chroot/var/cache/apt/archives/partial

		# Cleaning apt package lists
		if [ "${LB_APT_INDICES}" = "false" ]
		then
			rm -rf chroot/var/lib/apt/lists
			mkdir -p chroot/var/lib/apt/lists/partial
		fi

		# Remove local package repository
		rm -f chroot/etc/apt/sources.list.d/local-packages.list
		rm -rf chroot/root/local-packages

		# Remove local packages key if it exists
		if apt-key list | grep -q ${_LB_LOCAL_KEY_EMAIL}
		then
			apt-key del ${_LB_LOCAL_KEY_EMAIL}
		fi

		# Removing stage file
		rm -f .stage/chroot_sources
		;;

	*)
		Usage
		;;
esac