[show_tech] Filter out a list of commands in generate_dump script which are not applicable to Supervisor (sonic-net#3646)

hat I did
On 202205 branch, execute "show techsupport " on Supervisor. It hung in the scripts which call "show queue counters". This PR filters out a list of command which are not applicable to Supervisor. Fixes Nokia-ION/ndk#60

How I did it
Modify generate_dump script by adding code to check if IS_SUPERVISOR, not to executes the "show queue counters".
And also return at the beginning of the following functions which are not applicable on Supervisor:
save_bfd_info()
save_bgp_info()
save_evpn_info()
save_frr_info()
Also fix some of the failure which are shown during the show techsupport.
a) check if file /etc//cron.d/logrote exists before access it in function disable_logrotate() and enable_logrotate()
b) check if directory /var/log/sai_failure_dump/ exists before using this directory.
Add "show reboot-cause history" to the generate_dump
Check if output of "show vrf" is empty, don't access the empty list with "awk" command
How to verify it
"show techsupport" shoudl work fine on Supervisor as well as on LC

Signed-off-by: mlok <[email protected]>

Author: mlok-nokia

scripts/generate_dump

@@ -51,6 +51,7 @@ SAVE_STDERR=true
 RETURN_CODE=$EXT_SUCCESS
 DEBUG_DUMP=false
 ROUTE_TAB_LIMIT_DIRECT_ITERATION=24000
+IS_SUPERVISOR=false
 
 # lock dirs/files
 LOCKDIR="/tmp/techsupport-lock"
@@ -532,8 +533,11 @@ save_bgp_neighbor() {
         save_cmd "vtysh $ns -c \"show bgp ipv6 neighbors $word advertised-routes\"" "ipv6.bgp.neighbor.$word.adv$asic_id"
         save_cmd "vtysh $ns -c \"show bgp ipv6 neighbors $word routes\"" "ipv6.bgp.neighbor.$word.rcv$asic_id"
     done
-
-    vrf_list=`${timeout_cmd} bash -c "vtysh $ns -c 'show vrf' | awk -F" " '{print \$2}'"`
+    vrf_list=""
+    vrf_output=$(${timeout_cmd} bash -c "vtysh $ns -c 'show vrf'")
+    if [ ! -z $vrf_output]; then
+        vrf_list= echo $vrf_output | awk -F" " '{print $2}'
+    fi
     for vrf in $vrf_list; do
         neighbor_list=`${timeout_cmd} bash -c "vtysh $ns -c 'show ip bgp vrf $vrf neighbors' | grep 'BGP neighbor is' | awk -F '[, ]' '{print \$4}'"`
         for word in $neighbor_list; do
@@ -651,6 +655,9 @@ save_nat_info() {
 ###############################################################################
 save_bfd_info() {
     trap 'handle_error $? $LINENO' ERR
+    if $IS_SUPERVISOR; then
+        return
+    fi
     save_vtysh "show bfd peers" "frr.bfd.peers"
     save_vtysh "show bfd peers counters" "frr.bfd.peers.counters"
     save_vtysh "show bfd peers json" "frr.bfd.peers.json"
@@ -688,6 +695,9 @@ save_ip_info() {
 ###############################################################################
 save_bgp_info() {
     trap 'handle_error $? $LINENO' ERR
+    if $IS_SUPERVISOR; then
+        return
+    fi
     save_vtysh "show ip bgp summary" "bgp.summary"
     save_vtysh "show ip bgp neighbors" "bgp.neighbors"
     save_vtysh "show ip bgp" "bgp.table"
@@ -725,6 +735,9 @@ save_bgp_info() {
 ###############################################################################
 save_evpn_info() {
     trap 'handle_error $? $LINENO' ERR
+    if $IS_SUPERVISOR; then
+        return
+    fi
     save_vtysh "show bgp l2vpn evpn" "bgp.l2vpn.evpn"
     save_vtysh "show bgp l2vpn evpn summary json" "bgp.evpn.summary.json"
     save_vtysh "show bgp l2vpn evpn route" "bgp.evpn.route"
@@ -758,6 +771,9 @@ save_evpn_info() {
 ###############################################################################
 save_frr_info() {
     trap 'handle_error $? $LINENO' ERR
+    if $IS_SUPERVISOR; then
+        return
+    fi
     save_vtysh "show running-config" "frr.running_config"
     save_vtysh "show ip route vrf all nexthop-group" "frr.ip_route.nhg"
     save_vtysh "show ipv6 route vrf all nexthop-group" "frr.ip6_route.nhg"
@@ -1141,6 +1157,9 @@ find_files() {
 #  None
 ###############################################################################
 disable_logrotate() {
+    if [ ! -f "/etc/cron.d/logrotate" ]; then
+        return
+    fi
     sed -i '/\/usr\/sbin\/logrotate/s/^/#/g' /etc/cron.d/logrotate
 }
 
@@ -1154,6 +1173,9 @@ disable_logrotate() {
 #  None
 ###############################################################################
 enable_logrotate() {
+    if [ ! -f "/etc/cron.d/logrotate" ]; then
+        return
+    fi
     sed -i '/\/usr\/sbin\/logrotate/s/^#*//g' /etc/cron.d/logrotate
 }
 
@@ -1860,6 +1882,9 @@ save_crash_files() {
 #  None
 ###############################################################################
 save_sai_failure_dump(){
+    if [ ! -d "/var/log/sai_failure_dump/" ]; then
+        return
+    fi
     for file in $(find_files "/var/log/sai_failure_dump/"); do
         if $TAR -tf $TARFILE | grep $BASE/log/$(basename $file); then
             # if the files are already collected under the log/ dir
@@ -1919,7 +1944,9 @@ save_counter_snapshot() {
 
     save_cmd "echo $counter_t" "date.counter_$idx"
     save_cmd "show interface counters" "interface.counters_$idx"
-    save_cmd_all_ns "show queue counters" "queue.counters_$idx"
+    if ! $IS_SUPERVISOR; then
+       save_cmd_all_ns "show queue counters" "queue.counters_$idx"
+    fi
     save_redis "COUNTERS_DB" "COUNTERS_DB_$idx"
 
     if [ "$asic_name" = "broadcom" ]; then
@@ -2028,6 +2055,7 @@ main() {
 
     # Save reboot cause information
     save_cmd "show reboot-cause" reboot.cause &
+    save_cmd "show reboot-cause history" "reboot.cause.history" &
     wait
 
     local asic="$(/usr/local/bin/sonic-cfggen -y /etc/sonic/sonic_version.yml -v asic_type)"
@@ -2458,7 +2486,16 @@ fi
 ##
 ## Attempt Locking
 ##
-
+platform_name=$(show platform summary --json | python -c 'import sys, json; print(json.load(sys.stdin)["platform"])')
+supervisor=0
+PLATFORM_ENV_CONF=/usr/share/sonic/device/${platform_name}/platform_env.conf
+if [ -f "$PLATFORM_ENV_CONF" ]; then
+    source $PLATFORM_ENV_CONF
+fi
+if [[ x"$supervisor" == x"1" ]]; then
+    IS_SUPERVISOR=true
+fi
+    
 if $MKDIR "${LOCKDIR}" &>/dev/null; then
     trap 'handle_exit' EXIT
     echo "$$" > "${PIDFILE}"