apt caching proof of concept

config

@@ -20,15 +20,18 @@
 ## libdevuansdk configuration
 
 vars+=(release version mirror section blend_name image_name vm_name)
-vars+=(arch earch)
+vars+=(arch earch aptcachedir APT_CACHE)
 vars+=(usercredentials rootcredentials)
 
 arrs+=(core_packages base_packages purge_packages blend_packages)
 
+## enable local apt cache
+APT_CACHE=1
+aptcachedir="$LIBPATH/apt-cache"
 
 os="devuan"
 release="jessie"
-version="1.0.0-RC2"
+version="1.0.0"
 mirror="http://auto.mirror.devuan.org/merged"
 section="main"
 

zlibs/bootstrap

@@ -100,7 +100,6 @@ apt-get --yes --force-yes install ${core_packages}
 apt-get --yes --force-yes install ${base_packages}
 apt-get --yes --force-yes purge  ${purge_packages}
 apt-get --yes --force-yes autoremove
-apt-get clean
 
 rm -f /debconf.set
 rm -f /etc/ssh/ssh_host_*
@@ -174,7 +173,6 @@ done
 apt-get --yes --force-yes upgrade
 apt-get --yes --force-yes install ${extra_packages}
 apt-get --yes --force-yes autoremove
-apt-get clean
 EOF
 
 	chroot-script -d postunpack || zerr

zlibs/helpers

@@ -60,6 +60,7 @@ build_iso_dist() {
 	iso_write_isolinux_cfg  || { zerr; wrapup }
 	#[[ $INSTALLER = 1 ]] && iso_setup_installer || zerr
 	blend_postinst          || { zerr; wrapup }
+	fill_apt_cache          || { zerr; wrapup }
 	iso_squash_strap        || { zerr; wrapup }
 	iso_xorriso_build       || { zerr; wrapup }
 }
@@ -257,7 +258,6 @@ for deb in ${custom_deb_packages}; do
 done
 cd /
 apt-get autoremove
-apt-get clean
 rm -rf /debs
 EOF
 	chroot-script install-debs
@@ -269,6 +269,7 @@ chroot-script() {
 	ckreq || return 1
 
 	mkdir -p "$R/log"
+
 	case "x$1" in
 		x-d)
 			local script="$2"
@@ -278,6 +279,7 @@ chroot-script() {
 			## logging
 			sudo sed -i "$strapdir/$script" \
 				-e 's@#!/bin/sh@#!/bin/sh\'$'\nset -x ; exec 2>/'$script'.log@'
+
 			notice "chrooting to execute $script..."
 			sudo chmod +x  "$strapdir/$script"    || zerr
 			sudo -E chroot "$strapdir" "/$script" || zerr
@@ -288,15 +290,18 @@ chroot-script() {
 			;;
 		*)
 			local script="$1"
+			[[ "$APT_CACHE" = 1 ]] && { aptcache on "$strapdir/mnt"  || zerr }
 
 			## logging
 			sudo sed -i "$strapdir/$script" \
 				-e 's@#!/bin/sh@#!/bin/sh\'$'\nset -x ; exec 2>/'$script'.log@'
 
 			notice "chrooting to execute $script..."
-			sudo chmod +x  "$strapdir/$script" || zerr
+			sudo chmod +x  "$strapdir/$script"    || zerr
 			sudo -E chroot "$strapdir" "/$script" || zerr
 			sudo mv -f "$strapdir/${script}.log" "$R/log/"
+
+			[[ "$APT_CACHE" = 1 ]] && { aptcache off "$strapdir/mnt" || zerr }
 			;;
 	esac
 
@@ -352,6 +357,57 @@ blend_postinst() {
 	return 0
 }
 
+aptcache() {
+	fn aptcache "$*"
+	req=(aptcachedir watdo werdo APT_CACHE)
+	local watdo="$1"
+	local werdo="$2"
+	ckreq || return 1
+
+	[[ $APT_CACHE = 1 ]] || return 0
+
+	case "$watdo" in
+		on)
+			act "mounting local apt cache"
+			sudo mount -o bind "$aptcachedir" "$werdo" || zerr
+			;;
+		off)
+			act "umounting local apt cache"
+			sudo umount "$werdo" || zerr
+			;;
+	esac
+}
+
+fill_apt_cache() {
+	fn fill_apt_cache
+	req=(strapdir APT_CACHE)
+	ckreq || return 1
+
+	[[ $APT_CACHE = 1 ]] || return 0
+
+	notice "filling local apt cache"
+
+	cat <<EOF | sudo tee ${strapdir}/fill-apt-cache >/dev/null
+#!/bin/sh
+
+# NOTE: do we need apt update or does it read the remote(s)?
+apt-get update
+apt-get install dpkg-dev
+
+cp -afv /var/cache/apt/archives/*.deb /mnt
+cd /mnt
+dpkg-scanpackages . /dev/null | gzip -9c > Packages.gz
+cd -
+
+apt-get purge dpkg-dev
+
+sed -i -e "@deb file:/mnt@d" /etc/apt/sources.list
+apt-get update
+
+EOF
+	chroot-script fill-apt-cache || zerr
+}
+
 silly() {
 	fn silly "$@"
 	local arg1="$1"

zlibs/iso

@@ -33,7 +33,6 @@ iso_prepare_strap() {
 apt-get update
 apt-get --yes --force-yes install dialog live-boot live-boot-initramfs-tools
 apt-get --yes --force-yes autoremove
-apt-get clean
 EOF
 
 	chroot-script -d isoprep    || zerr

zlibs/sysconf

@@ -118,6 +118,8 @@ conf_print_sourceslist() {
 	ckreq || return 1
 
 	cat <<EOF
+deb file:/mnt ./
+
 ## package repositories
 deb ${mirror} ${release} ${section}
 deb ${mirror} ${release}-updates ${section}