--- a/lib/pvl/hosts/dhcp.sh	Tue Mar 03 12:08:58 2015 +0200
+++ b/lib/pvl/hosts/dhcp.sh	Tue Mar 03 12:09:22 2015 +0200
@@ -11,10 +11,11 @@
 function update_hosts_dhcp {
     local out="$1"
     local src="$2"
-    local srcs=($(list_tree $src))
     local msg="$out: Generating DHCP hosts: $src"
+    local include_cache=$(include_cache_path $src)
+    local srcs=($(include_cache $include_cache))
 
-    if apply_check "$out" "${srcs[@]}"; then
+    if apply_check "$out" ${srcs[@]:-}; then
         log_skip "$msg"
     else
         log_apply "$msg"

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/pvl/hosts/include_cache.sh	Tue Mar 03 12:09:22 2015 +0200
@@ -0,0 +1,26 @@
+INCLUDE_CACHE='var/include-cache'
+
+## Normalize a given source path for use in the include-cache
+function include_cache_path {
+    local src="$1"
+    local cache="$src"
+
+    cache="${cache//_/__}"
+    cache="${cache//\//_}"
+
+    echo "$INCLUDE_CACHE/$cache"
+}
+
+## Read the include cache for given path
+function include_cache {
+    local cache="$1"
+
+    if [ ! -e "$cache" ]; then
+        debug "missing: $cache"
+
+        return 0
+    fi
+    
+    cat $cache
+}
+

--- a/lib/pvl/hosts/update.sh	Tue Mar 03 12:08:58 2015 +0200
+++ b/lib/pvl/hosts/update.sh	Tue Mar 03 12:09:22 2015 +0200
@@ -4,6 +4,7 @@
 UPDATE_RELOAD=
 UPDATE_INCLUDES=
 
+. $LIB/pvl/hosts/include_cache.sh
 . $LIB/pvl/hosts/dhcp.sh
 . $LIB/pvl/hosts/zone.sh
 

--- a/lib/pvl/hosts/zone.sh	Tue Mar 03 12:08:58 2015 +0200
+++ b/lib/pvl/hosts/zone.sh	Tue Mar 03 12:09:22 2015 +0200
@@ -13,16 +13,18 @@
 function update_hosts_forward {
     local out="$1"
     local src="$2"
-    local srcs=($(list_tree $src))
     local msg="$out: Generating forward hosts zone: $src"
+    local include_cache=$(include_cache_path $src)
+    local srcs=($(include_cache $include_cache))
 
-    if apply_check "$out" "${srcs[@]}"; then
+    if apply_check "$out" ${srcs[@]:-}; then
         log_skip "$msg"
     else
         log_apply "$msg"
     
         apply_cmd "$out" $OPT/bin/pvl.hosts-forward \
-            --hosts-include="$HOSTS_INCLUDE" \
+            --hosts-include=$HOSTS_INCLUDE \
+            --hosts-include-trace=$include_cache \
              "$src"
     fi
 }
@@ -33,16 +35,18 @@
 function update_hosts_reverse {
     local out="$1"
     local src="$2"
-    local srcs=($(list_tree $src))
     local msg="$out: Generating reverse hosts zone: $src"
+    local include_cache=$(include_cache_path $src)
+    local srcs=($(include_cache $include_cache))
 
-    if apply_check "$out" "${srcs[@]}"; then
+    if apply_check "$out" ${srcs[@]:-}; then
         log_skip "$msg"
     else
         log_apply "$msg"
     
         apply_cmd "$out" $OPT/bin/pvl.hosts-reverse \
             --hosts-include="$HOSTS_INCLUDE" \
+            --hosts-include-trace=$include_cache \
              "$src"
     fi
 }