auto/config: enable Debug::pkgDepCache::AutoInstall so tracking down

dependency bugs in the livefs is a little clearer.

debian/changelog

@@ -1,9 +1,14 @@
 livecd-rootfs (2.448) UNRELEASED; urgency=medium
 
+  [ Balint Reczey ]
   * Depend on packages in main instead of installing them at runtime
   * Depend on pxz and vmdk-stream-converter instead of installing them
     at run time
 
+  [ Mathieu Trudel-Lapierre ]
+  * auto/config: enable Debug::pkgDepCache::AutoInstall so tracking down
+    dependency bugs in the livefs is a little clearer.
+
  -- Balint Reczey <rbalint@ubuntu.com>  Wed, 14 Jun 2017 18:25:32 +0200
 
 livecd-rootfs (2.447) artful; urgency=medium

live-build/auto/config

@@ -94,6 +94,8 @@ PREINSTALL_POOL_SEEDS=
 CHROOT_HOOKS=
 BINARY_HOOKS=
 
+APT_OPTIONS=" --yes -oDebug::pkgDepCache::AutoInstall=yes "
+
 add_chroot_hook ()
 {
 	CHROOT_HOOKS="${CHROOT_HOOKS:+$CHROOT_HOOKS }$1"
@@ -343,7 +345,7 @@ case $PROJECT in
 
 		# The Lubuntu STRUCTURE file has "feature
 		# no-follow-recommends".  Mirror this.
-		export APT_OPTIONS="--yes --no-install-recommends"
+		APT_OPTIONS="${APT_OPTIONS} --no-install-recommends"
 		;;
 
 	lubuntu-next)
@@ -359,7 +361,7 @@ case $PROJECT in
 
 		# The Lubuntu STRUCTURE file has "feature
 		# no-follow-recommends". Mirror this.
-		export APT_OPTIONS="--yes --no-install-recommends"
+		APT_OPTIONS="${APT_OPTIONS} --no-install-recommends"
 		;;
 
 	ubuntu-gnome)
@@ -557,6 +559,8 @@ case $PROJECT in
 		;;
 esac
 
+export APT_OPTIONS
+
 if [ "$PREINSTALLED" != "true" ] && [ "$LIVE_TASK" ]; then
 	add_task live "$LIVE_TASK"
 fi