From: Ralph Ronnquist <ralph.ronnquist@gmail.com>
Date: Sat, 26 Feb 2022 23:08:14 +0000 (+1100)
Subject: Minor correction, with explicit chroot (as required in beowulf)
X-Git-Url: https://git.rrq.au/?a=commitdiff_plain;h=e0808ddd112116c36fc3fceb65bea8589dff5647;p=rrq%2Fsubhost.git

Minor correction, with explicit chroot (as required in beowulf)
---

diff --git a/control b/control
index b63bc74..f5831a2 100755
--- a/control
+++ b/control
@@ -29,7 +29,7 @@ usage() {
 : ${WORK=$TOP/work}
 : ${MOUNT=$TOP/mnt}
 : ${NSNAME=$NAME}
-: ${BRIDGES=homenet}
+: ${BRIDGES=lan_br}
 : ${CONFIG=$TOP/config}
 
 [ -e "$CONFIG" ] && . "$CONFIG"
@@ -39,7 +39,7 @@ cd "$SUBHOST" || exit 1
 # Create a simple overlay subhost without its own image file
 create_subhost() {
     mkdir -p $TARGET $MOUNT $UPPER $WORK
-    [ -d "$OSROOT" ] || OSROOT=$SUBHOST/daedalus/root
+    [ -d "$OSROOT" ] || OSROOT=$SUBHOST/chimaera/base
     [ -e $CONFIG ] || cat <<EOF > "$CONFIG"
 # Subhost $NAME is an autogenerated overlay subhost with shared filesystem
 OSROOT="$OSROOT"
@@ -47,10 +47,18 @@ BRIDGES="$BRIDGES"
 EOF
 }
 
-# generate a mac for given $1 (interface) using the last 5 characters
+# map a string into a hexadecimal number with 10-digits by folding the given string into 9-digit ascii-code numbers and adding them
+hexfoldsum() {
+    local V
+    V="$(b2sum -l 40 <<< "$1" | sed 's/\(..\)/\1:/g')"
+    echo "02:${V:0:14}"
+}
+
+# Generate a mac address for given interface by passing hostname,
+# subhost name and interface through 40-bit b2sum and with 02: prefix.
 macaddr() {
-    local M="$(xxd -p <<< "${1:$(( ${#1} - 5)):5}")66666666"
-    echo "0a:${M:0:2}:${M:2:2}:${M:4:2}:${M:6:2}:${M:8:2}"
+    local V="$(b2sum -l 40 <<< "$(hostname)$NAME$1" | sed 's/\(..\)/\1:/g')"
+    echo "02:${V:0:14}"
 }
 
 # setup the subhost network namespace and link up the host side
@@ -78,8 +86,9 @@ setup_rootfs() {
     if is_mounted $TARGET ; then
 	mount -oremount $TARGET
     else
-	if [ -f "$IMAGE" ] ; then
-	    # The subhost has an image file with /root and /work in it
+	if [ -e "$IMAGE" ] ; then
+	    # $IMAGE is either an image file or a link to a partition,
+	    # with /root and /work in it.
 	    is_mounted $MOUNT || mount $IMAGE $MOUNT || exit 1
 	    UPPER=$MOUNT/root
 	    WORK=$MOUNT/work
@@ -106,7 +115,7 @@ case "$CMD" in
 	exec ip netns exec $NSNAME unshare \
 	     --fork --pid --mount-proc --kill-child \
 	     --uts --ipc --mount --cgroup \
-	     "--root=$TARGET" $START
+	     chroot $TARGET $START
 	;;
     stop)
 	umount $TARGET