ovs-save: Refactor and move some code to ovs-lib.

An upcoming commit becomes the second user of the
new functions.

Signed-off-by: Gurucharan Shetty <gshetty@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>

utilities/ovs-lib.in

@@ -250,3 +250,68 @@ daemon_is_running () {
     pidfile=$rundir/$1.pid
     test -e "$pidfile" && pid=`cat "$pidfile"` && pid_exists "$pid" && pid_comm_check $1 $pid
 } >/dev/null 2>&1
+
+# Prints commands needed to restore the ip address of an interface.
+save_ip_address () {
+    dev="$1"
+
+    # IP addresses (including IPv6).
+    echo "ip addr flush dev $dev 2>/dev/null" # Suppresses "Nothing to flush".
+    ip addr show dev $dev | while read addr; do
+        set -- $addr
+
+        # Check and trim family.
+        family=$1
+        shift
+        case $family in
+            inet | inet6) ;;
+            *) continue ;;
+        esac
+
+        # Trim device off the end--"ip" insists on having "dev" precede it.
+        addrcmd=
+        while test $# != 0; do
+            case $1 in
+                dynamic)
+                    # Omit kernel-maintained route.
+                    continue 2
+                    ;;
+                scope)
+                    if test "$2" = link -a "$family" != inet6; then
+                        # Omit route derived from IP address, e.g.
+                        # 172.16.0.0/16 derived from 172.16.12.34,
+                        # but preserve IPv6 link-local address.
+                        continue 2
+                    fi
+                    ;;
+                "$dev"|"$dev:"*)
+                    # Address label string
+                    addrcmd="$addrcmd label $1"
+                    shift
+                    continue
+                    ;;
+            esac
+            addrcmd="$addrcmd $1"
+            shift
+        done
+        if test "$1" != "$dev"; then
+            addrcmd="$addrcmd $1"
+        fi
+
+        echo ip -f $family addr add $addrcmd dev $dev
+    done
+}
+
+# Prints commands needed to restore the ip route of an interface.
+save_ip_routes () {
+    dev="$1"
+    echo "ip route flush dev $dev proto boot 2>/dev/null" # Suppresses "Nothing to flush".
+    ip route show dev $dev | while read route; do
+        # "proto kernel" routes are installed by the kernel automatically.
+        case $route in
+            *" proto kernel "*) continue ;;
+        esac
+
+        echo "ip route add $route dev $dev"
+    done
+}

utilities/ovs-save

@@ -14,6 +14,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+case $0 in
+    */*) dir0=`echo "$0" | sed 's,/[^/]*$,,'` ;;
+    *) dir0=./ ;;
+esac
+. "$dir0/ovs-lib" || exit 1
+
 usage() {
     UTIL=$(basename $0)
     cat <<EOF
@@ -78,62 +84,9 @@ save_interfaces () {
             echo ip link set dev $dev $linkcmd
         fi
 
-        # IP addresses (including IPv6).
+        save_ip_address $dev
-        echo "ip addr flush dev $dev 2>/dev/null" # Suppresses "Nothing to flush".
-        ip addr show dev $dev | while read addr; do
-            set -- $addr
 
-            # Check and trim family.
+        save_ip_routes $dev
-            family=$1
-            shift
-            case $family in
-                inet | inet6) ;;
-                *) continue ;;
-            esac
-
-            # Trim device off the end--"ip" insists on having "dev" precede it.
-            addrcmd=
-            while test $# != 0; do
-                case $1 in
-                    dynamic)
-                        # Omit kernel-maintained route.
-                        continue 2
-                        ;;
-                    scope)
-                        if test "$2" = link -a "$family" != inet6; then
-                            # Omit route derived from IP address, e.g.
-                            # 172.16.0.0/16 derived from 172.16.12.34,
-                            # but preserve IPv6 link-local address.
-                            continue 2
-                        fi
-                        ;;
-                    "$dev"|"$dev:"*)
-                        # Address label string
-                        addrcmd="$addrcmd label $1"
-                        shift
-                        continue
-                        ;;
-                esac
-                addrcmd="$addrcmd $1"
-                shift
-            done
-            if test "$1" != "$dev"; then
-                addrcmd="$addrcmd $1"
-            fi
-
-            echo ip -f $family addr add $addrcmd dev $dev
-        done
-
-        # Routes.
-        echo "ip route flush dev $dev proto boot 2>/dev/null" # Suppresses "Nothing to flush".
-        ip route show dev $dev | while read route; do
-            # "proto kernel" routes are installed by the kernel automatically.
-            case $route in
-                *" proto kernel "*) continue ;;
-            esac
-
-            echo "ip route add $route dev $dev"
-        done
 
         echo
     done