bare image: tweak apt.conf settings: 86M

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>

scripts/chroot.sh

@@ -160,6 +160,16 @@ if [ "x${chroot_very_small_image}" = "xenable" ] ; then
 	sudo sh -c "echo \"path-exclude=/usr/share/doc/*\" >> ${tempdir}/etc/dpkg/dpkg.cfg.d/excludes"
 	sudo sh -c "echo \"\" >> ${tempdir}/etc/dpkg/dpkg.cfg.d/excludes"
 
+	#apt: no local cache
+	sudo sh -c "echo \"Dir::Cache {\" >> ${tempdir}/etc/apt/apt.conf.d/02nocache"
+	sudo sh -c "echo \"  srcpkgcache \"\";\" >> ${tempdir}/etc/apt/apt.conf.d/02nocache"
+	sudo sh -c "echo \"  pkgcache \"\";\" >> ${tempdir}/etc/apt/apt.conf.d/02nocache"
+	sudo sh -c "echo \"}\" >> ${tempdir}/etc/apt/apt.conf.d/02nocache"
+
+	#apt: /var/lib/apt/lists/, store compressed only
+	sudo sh -c "echo \"Acquire::GzipIndexes \"true\";\" >> ${tempdir}/etc/apt/apt.conf.d/02compress-indexes"
+	sudo sh -c "echo \"Acquire::CompressionTypes::Order:: \"gz\";\" >> ${tempdir}/etc/apt/apt.conf.d/02compress-indexes"
+
 	echo "Log: after locale/man purge"
 	report_size
 fi