Add bind-mount for /etc/adjtime to make subhost use host clock without ado

[rrq/overlay-boot.git] / functions

diff --git a/functions b/functions
index e9111fe08e9c72e6640a7cca20dfe1e1f88b9449..8f39d4014e9213a56c63f4dc03b228f94e73c5ce 100644 (file)
--- a/functions
+++ b/functions
@@ -92,6 +92,9 @@ EOF
 
 # Setup the network namespace for the given $CABLES
 # $1=netns ( $2="br=mac" .. )
+# br is optional, mac is optional.
+# If mac is .N then it's taken as vlan tag on prior outer interface
+# (with ifup configuration) and the inner interface is left alone.
 setup_veth_cables() {
     local NETNS BR IF MAC C i ADD
     NETNS="$1"
@@ -100,14 +103,29 @@ setup_veth_cables() {
     for C in "$@" ; do
        IF=$NETNS$i
        MAC="${C#*=}"
-       [ -z "$MAC" ] || MAC="address $MAC"
-       ip link add $IF type veth peer name eth$i $MAC netns $NETNS
-       ip link set $IF up
+        if ip link show $IF > /dev/null 2>&1 ; then
+           : # The interface exists already (bad badness); let things fail
+        elif ifquery --state $IF >/dev/null 2>&1 ; then
+            # doesn't exist but has residue state; quiet cleanup
+            ifdown -f $IF > /dev/null 2>&1
+        fi
+       if [ -z "$MAC" ] ; then
+           # set up veth with "random" mac address
+           ip link add $IF type veth peer name eth$i netns $NETNS
+       elif [ -z "${MAC%%.*}" ] ; then
+           # set up a host vlan with specified tag on previous eth 
+           i=$((i-1))
+           IF=$NETNS$i$MAC
+           ifup $IF
+       else
+           # set up veth with specified mac address
+           ip link add $IF type veth peer name eth$i address $MAC netns $NETNS
+       fi
        BR="${C%=*}"
        if [ -z "$BR" ] ; then
-           ip link set $IF
-           ifup $IF
+           ifup $IF || ip link set $IF up
        else
+           ip link set $IF up
            brctl addif $BR $IF
        fi
        i=$((i+1))
@@ -151,17 +169,17 @@ setup_overlay() {
     elif [ "$LIVE" != "$UPPER" ] ; then
        # With UPPER = LOWER we rather make a bind mount to LIVE
        env CONFIG="$CONFIG" $PREMOUNT "$UPPER"
-       mount --bind $UPPER $LOWER
+       mount --bind $UPPER $LIVE
     fi
 
     grep ^SHARE= "$CONFIG" | while read A ; do
         B="$(echo ${A#SHARE=})"
-        D="$(realpath "$LOWER$B")"
+        D="$(realpath "$B")"
         [ "$D" = "$LOWER" ] && continue
         if [ -d "$D" ] ; then
-            echo bind mount $D onto $LIVE$D
+            echo bind mount $D onto $LIVE$B
             mkdir -p $LIVE$D
-            mount --bind $D $LIVE$D
+            mount --bind $D $LIVE$B
         fi
     done