introduce if/then & for/do rules

we mostly have a consistent style on if/then & for/do in devstack,
except when we don't. This attempts to build a set of rules to
enforce this.

Because there are times when lines are legitimately long, and there
is a continuation, this starts off ignoring if and for loops with
continuations. But for short versions, we should enforce this.

Changes to make devstack pass are included. The fact that the
cleanup patch was so small is pretty solid reason that this is
actually the style we've all agreed to.

Part of a git stash from hong kong that I finally cleaned up.

Change-Id: I6376d7afd59cc5ebba9ed69e5ee784a3d5934a10

lib/baremetal

@@ -431,8 +431,7 @@ function upload_baremetal_image() {
 
 function clear_baremetal_of_all_nodes() {
     list=$(nova baremetal-node-list | awk -F '| ' 'NR>3 {print $2}' )
-    for node in $list
-    do
+    for node in $list; do
         nova baremetal-node-delete $node
     done
 }

lib/heat

@@ -186,8 +186,7 @@ function disk_image_create {
     local elements=$2
     local arch=$3
     local output=$TOP_DIR/files/$4
-    if [[ -f "$output.qcow2" ]];
-    then
+    if [[ -f "$output.qcow2" ]]; then
         echo "Image file already exists: $output_file"
     else
         ELEMENTS_PATH=$elements_path disk-image-create \

lib/neutron_plugins/bigswitch_floodlight

@@ -44,16 +44,14 @@ function neutron_plugin_configure_plugin_agent() {
 function neutron_plugin_configure_service() {
     iniset /$Q_PLUGIN_CONF_FILE restproxy servers $BS_FL_CONTROLLERS_PORT
     iniset /$Q_PLUGIN_CONF_FILE restproxy servertimeout $BS_FL_CONTROLLER_TIMEOUT
-    if [ "$BS_FL_VIF_DRIVER" = "ivs" ]
-    then
+    if [ "$BS_FL_VIF_DRIVER" = "ivs" ]; then
         iniset /$Q_PLUGIN_CONF_FILE nova vif_type ivs
     fi
 }
 
 function neutron_plugin_setup_interface_driver() {
     local conf_file=$1
-    if [ "$BS_FL_VIF_DRIVER" = "ivs" ]
-    then
+    if [ "$BS_FL_VIF_DRIVER" = "ivs" ]; then
         iniset $conf_file DEFAULT interface_driver neutron.agent.linux.interface.IVSInterfaceDriver
     else
         iniset $conf_file DEFAULT interface_driver neutron.agent.linux.interface.OVSInterfaceDriver

lib/neutron_plugins/nec

@@ -106,8 +106,7 @@ function _neutron_setup_ovs_tunnels() {
     local id=0
     GRE_LOCAL_IP=${GRE_LOCAL_IP:-$HOST_IP}
     if [ -n "$GRE_REMOTE_IPS" ]; then
-        for ip in ${GRE_REMOTE_IPS//:/ }
-        do
+        for ip in ${GRE_REMOTE_IPS//:/ }; do
             if [[ "$ip" == "$GRE_LOCAL_IP" ]]; then
                 continue
             fi

lib/neutron_thirdparty/bigswitch_floodlight

@@ -24,8 +24,7 @@ function init_bigswitch_floodlight() {
     sudo ovs-vsctl --no-wait br-set-external-id ${OVS_BRIDGE} bridge-id ${OVS_BRIDGE}
 
     ctrls=
-    for ctrl in `echo ${BS_FL_CONTROLLERS_PORT} | tr ',' ' '`
-    do
+    for ctrl in `echo ${BS_FL_CONTROLLERS_PORT} | tr ',' ' '`; do
         ctrl=${ctrl%:*}
         ctrls="${ctrls} tcp:${ctrl}:${BS_FL_OF_PORT}"
     done

stack.sh

@@ -1124,8 +1124,8 @@ fi
 # Create a randomized default value for the keymgr's fixed_key
 if is_service_enabled nova; then
     FIXED_KEY=""
-    for i in $(seq 1 64);
-        do FIXED_KEY+=$(echo "obase=16; $(($RANDOM % 16))" | bc);
+    for i in $(seq 1 64); do
+        FIXED_KEY+=$(echo "obase=16; $(($RANDOM % 16))" | bc);
     done;
     iniset $NOVA_CONF keymgr fixed_key "$FIXED_KEY"
 fi

tests/functions.sh

@@ -49,8 +49,7 @@ function test_enable_service() {
 
     ENABLED_SERVICES="$start"
     enable_service $add
-    if [ "$ENABLED_SERVICES" = "$finish" ]
-    then
+    if [ "$ENABLED_SERVICES" = "$finish" ]; then
         echo "OK: $start + $add -> $ENABLED_SERVICES"
     else
         echo "changing $start to $finish with $add failed: $ENABLED_SERVICES"
@@ -76,8 +75,7 @@ function test_disable_service() {
 
     ENABLED_SERVICES="$start"
     disable_service "$del"
-    if [ "$ENABLED_SERVICES" = "$finish" ]
-    then
+    if [ "$ENABLED_SERVICES" = "$finish" ]; then
         echo "OK: $start - $del -> $ENABLED_SERVICES"
     else
         echo "changing $start to $finish with $del failed: $ENABLED_SERVICES"
@@ -102,8 +100,7 @@ echo "Testing disable_all_services()"
 ENABLED_SERVICES=a,b,c
 disable_all_services
 
-if [[ -z "$ENABLED_SERVICES" ]]
-then
+if [[ -z "$ENABLED_SERVICES" ]]; then
     echo "OK"
 else
     echo "disabling all services FAILED: $ENABLED_SERVICES"
@@ -118,8 +115,7 @@ function test_disable_negated_services() {
 
     ENABLED_SERVICES="$start"
     disable_negated_services
-    if [ "$ENABLED_SERVICES" = "$finish" ]
-    then
+    if [ "$ENABLED_SERVICES" = "$finish" ]; then
         echo "OK: $start + $add -> $ENABLED_SERVICES"
     else
         echo "changing $start to $finish failed: $ENABLED_SERVICES"

tools/bash8.py

@@ -21,9 +21,19 @@
 # Currently Supported checks
 #
 # Errors
+# Basic white space errors, for consistent indenting
 # - E001: check that lines do not end with trailing whitespace
 # - E002: ensure that indents are only spaces, and not hard tabs
 # - E003: ensure all indents are a multiple of 4 spaces
+#
+# Structure errors
+#
+# A set of rules that help keep things consistent in control blocks.
+# These are ignored on long lines that have a continuation, because
+# unrolling that is kind of "interesting"
+#
+# - E010: *do* not on the same line as *for*
+# - E011: *then* not on the same line as *if*
 
 import argparse
 import fileinput
@@ -51,6 +61,23 @@ def print_error(error, line):
     print(" - %s: L%s" % (fileinput.filename(), fileinput.filelineno()))
 
 
+def not_continuation(line):
+    return not re.search('\\\\$', line)
+
+def check_for_do(line):
+    if not_continuation(line):
+        if re.search('^\s*for ', line):
+            if not re.search(';\s*do(\b|$)', line):
+                print_error('E010: Do not on same line as for', line)
+
+
+def check_if_then(line):
+    if not_continuation(line):
+        if re.search('^\s*if \[', line):
+            if not re.search(';\s*then(\b|$)', line):
+                print_error('E011: Then non on same line as if', line)
+
+
 def check_no_trailing_whitespace(line):
     if re.search('[ \t]+$', line):
         print_error('E001: Trailing Whitespace', line)
@@ -100,6 +127,8 @@ def check_files(files):
 
         check_no_trailing_whitespace(logical_line)
         check_indents(logical_line)
+        check_for_do(logical_line)
+        check_if_then(logical_line)
 
 
 def get_options():

tools/xen/install_os_domU.sh

@@ -194,8 +194,7 @@ function wait_for_VM_to_halt() {
     while true
     do
         state=$(xe_min vm-list name-label="$GUEST_NAME" power-state=halted)
-        if [ -n "$state" ]
-        then
+        if [ -n "$state" ]; then
             break
         else
             echo -n "."

tools/xen/scripts/install-os-vpx.sh

@@ -63,8 +63,7 @@ get_params()
                 ;;
         esac
     done
-    if [[ -z $BRIDGE ]]
-    then
+    if [[ -z $BRIDGE ]]; then
         BRIDGE=xenbr0
     fi
 
@@ -91,8 +90,7 @@ xe_min()
 find_network()
 {
     result=$(xe_min network-list bridge="$1")
-    if [ "$result" = "" ]
-    then
+    if [ "$result" = "" ]; then
         result=$(xe_min network-list name-label="$1")
     fi
     echo "$result"
@@ -121,8 +119,7 @@ destroy_vifs()
 {
     local v="$1"
     IFS=,
-    for vif in $(xe_min vif-list vm-uuid="$v")
-    do
+    for vif in $(xe_min vif-list vm-uuid="$v"); do
         xe vif-destroy uuid="$vif"
     done
     unset IFS

tools/xen/scripts/on_exit.sh

@@ -7,8 +7,7 @@ declare -a on_exit_hooks
 
 on_exit()
 {
-    for i in $(seq $((${#on_exit_hooks[*]} - 1)) -1 0)
-    do
+    for i in $(seq $((${#on_exit_hooks[*]} - 1)) -1 0); do
         eval "${on_exit_hooks[$i]}"
     done
 }
@@ -17,8 +16,7 @@ add_on_exit()
 {
     local n=${#on_exit_hooks[*]}
     on_exit_hooks[$n]="$*"
-    if [[ $n -eq 0 ]]
-    then
+    if [[ $n -eq 0 ]]; then
         trap on_exit EXIT
     fi
 }

tools/xen/test_functions.sh

@@ -227,16 +227,14 @@ function test_get_local_sr_path {
 }
 
 [ "$1" = "run_tests" ] && {
-    for testname in $($0)
-    do
+    for testname in $($0); do
         echo "$testname"
         before_each_test
         (
             set -eux
             $testname
         )
-        if [ "$?" != "0" ]
-        then
+        if [ "$?" != "0" ]; then
             echo "FAIL"
             exit 1
         else