--- a/lib/update.operations	Wed Mar 21 16:45:59 2012 +0200
+++ b/lib/update.operations	Wed Mar 21 17:04:21 2012 +0200
@@ -3,6 +3,21 @@
 #
 # Operations on zonefiles/hosts/whatever
 
+function link_generic {
+    local out=$1
+    local tgt=$2
+
+    if check_link $out $tgt; then
+        log_update "Linking $out -> $tgt..."
+
+        do_link $out $tgt
+
+    else
+        log_skip "Linking $out -> $tgt: not changed"
+    fi
+}
+
+
 ## Hosts
 ## Update hosts from verbatim from input zone data:
 #
@@ -100,17 +115,11 @@
     local zone=$1
     local base=$2
 
-    local lnk=$SERIALS/$zone.serial
+    local out=$SERIALS/$zone.serial
     local tgt=$SERIALS/$base.serial
 
-    if check_link $lnk $tgt; then
-        log_update "Linking $lnk -> $tgt..."
 
-        do_link $lnk $tgt
-
-    else
-        log_skip "Linking $lnk -> $tgt: not changed"
-    fi
+    link_generic $out $tgt
 }
 
 ## Update zone file verbatim from source:
@@ -180,14 +189,18 @@
     local out=$ZONES/$view/$zone
     local tgt=$(choose_link $out $ZONES/$view/$base $ZONES/common/$base)
 
-    if check_link $out $tgt; then
-        log_update "Linking $out -> $tgt..."
+    link_generic $out $tgt
+}
 
-        do_link $out $tgt
+## Link dhcp file directly from data to hosts
+function link_dhcp_hosts {
+    local hosts=$1
+    local base=${2:-$hosts}
 
-    else
-        log_skip "Linking $out -> $tgt: not changed"
-    fi
+    local out=$DHCP/$hosts.conf
+    local tgt=$(choose_link $out $DHCP/$base.conf $DHCP_DATA/$base.conf)
+
+    link_generic $out $tgt
 }
 
 ## Test hosts zone for validity:
@@ -239,6 +252,39 @@
     fi
 }
 
+## Test DHCP configuration for validity using dhcpd -t:
+#
+#   check_dhcp      [$conf]
+#
+# Defaults to the global $DHCPD_CONF.
+# Fails if the check fails.
+function check_dhcp {
+    local conf=${1:-$DHCPD_CONF}
+
+    local cmd=($DHCPD -cf $conf -t)
+
+    if "${cmd[@]}" -q; then
+        log_skip    "Check $conf: OK"
+
+    else
+        log_error   "  Check $conf: Failed"
+
+        indent "    " "${cmd[@]}"
+
+        exit 1
+    fi
+}
+
+## Test DHCP configuration of given hosts file using check_dhcp $DHCP/$host.conf:
+#
+#   check_dhcp_hosts    $host
+#
+function check_dhcp_hosts {
+    local host=$1
+
+    check_dhcp $DHCP/$host.conf
+}
+
 # Run rndc reload
 function do_reload {
     # run