Add systemd unit for vbmcd in devstack

Besides managing vbmcd from systemd, this patch fixes a bug
in vbmcd handling.

The bug was that devstack runs ironic plugin under user `stack`, but
preserving superuser environment by means of `su -p`. That makes
`vbmcd` expanding tilda into `/root`, attempting to write into that
directory and failing miserably.

On top of that, all this happens when `vbmc` tries to invoke `vbmcd`
under the hood to preserve backward compatibility of the `vbmc`
behaviour before `vbmcd` was introduced.

This patch:

* adds systemd unit file for vbmcd
* invokes `vbmcd` explicitly before everything else and
* does that before becoming root and `stack` again

The `vbmc` tool can still run in a broken environment
for as long as it does not depend on the config file.

Change-Id: I6670ea50d126065d0472e558943890d4f9313083

devstack/lib/ironic

@@ -336,6 +336,7 @@ IRONIC_IS_HARDWARE=$(trueorfalse False IRONIC_IS_HARDWARE)
 IRONIC_VBMC_PORT_RANGE_START=${IRONIC_VBMC_PORT_RANGE_START:-6230}
 IRONIC_VBMC_CONFIG_FILE=${IRONIC_VBMC_CONFIG_FILE:-$HOME/.vbmc/virtualbmc.conf}
 IRONIC_VBMC_LOGFILE=${IRONIC_VBMC_LOGFILE:-$IRONIC_VM_LOG_DIR/virtualbmc.log}
+IRONIC_VBMC_SYSTEMD_SERVICE=devstack@virtualbmc.service
 
 # Virtual PDU configs
 IRONIC_VPDU_CONFIG_FILE=${IRONIC_VPDU_CONFIG_FILE:-$HOME/.vpdu/virtualpdu.conf}
@@ -723,6 +724,25 @@ function setup_syslinux_modules {
     fi
 }
 
+function start_virtualbmc {
+    $SYSTEMCTL start $IRONIC_VBMC_SYSTEMD_SERVICE
+}
+
+function stop_virtualbmc {
+    $SYSTEMCTL stop $IRONIC_VBMC_SYSTEMD_SERVICE
+}
+
+function cleanup_virtualbmc {
+    stop_virtualbmc
+
+    $SYSTEMCTL disable $IRONIC_VBMC_SYSTEMD_SERVICE
+
+    local unitfile="$SYSTEMD_DIR/$IRONIC_VBMC_SYSTEMD_SERVICE"
+    sudo rm -f $unitfile
+
+    $SYSTEMCTL daemon-reload
+}
+
 function setup_virtualbmc {
     # Install pyghmi from source, if requested, otherwise it will be
     # downloaded as part of the virtualbmc installation
@@ -747,8 +767,18 @@ function setup_virtualbmc {
 
     iniset $IRONIC_VBMC_CONFIG_FILE log debug True
     iniset $IRONIC_VBMC_CONFIG_FILE log logfile $IRONIC_VBMC_LOGFILE
-}
 
+    local cmd
+
+    cmd=$(which vbmcd)
+    cmd+=" --foreground"
+
+    write_user_unit_file $IRONIC_VBMC_SYSTEMD_SERVICE "$cmd" "" "root"
+
+    $SYSTEMCTL enable $IRONIC_VBMC_SYSTEMD_SERVICE
+
+    start_virtualbmc
+}
 
 function setup_virtualpdu {
     if use_library_from_git "virtualpdu"; then
@@ -2450,7 +2480,7 @@ function cleanup_baremetal_basic_ops {
         done
     done
 
-    sudo killall vbmc || true
+    cleanup_virtualbmc
 
     sudo ovs-vsctl --if-exists del-br $IRONIC_VM_NETWORK_BRIDGE
 

devstack/tools/ironic/scripts/cleanup-node.sh

@@ -23,7 +23,7 @@ virsh list --inactive | grep -q $NAME && virsh undefine $NAME --nvram
 
 # Delete the Virtual BMC
 if [[ $(type -P vbmc) != "" ]]; then
-    sudo vbmc list | grep -a $NAME && sudo vbmc delete $NAME
+    vbmc list | grep -a $NAME && vbmc delete $NAME
 fi
 
 if virsh pool-list | grep -q $LIBVIRT_STORAGE_POOL ; then

devstack/tools/ironic/scripts/create-node.sh

@@ -129,10 +129,10 @@ if ! virsh list --all | grep -q $NAME; then
         --disk-format $DISK_FORMAT $VM_LOGGING --engine $ENGINE $UEFI_OPTS $vm_opts \
         --interface-count $INTERFACE_COUNT $MAC_ADDRESS >&2
 
-    # Createa Virtual BMC for the node if IPMI is used
+    # Create Virtual BMC for the node if IPMI is used
     if [[ $(type -P vbmc) != "" ]]; then
-        sudo vbmc add $NAME --port $VBMC_PORT
-        sudo vbmc start $NAME
+        vbmc add $NAME --port $VBMC_PORT
+        vbmc start $NAME
     fi
 fi