show tech with platform dump option (sonic-net#1158)

- What I did
Add an option to force the hardware register dump with -f for show techsupport --allow-process-stop
- How I did it
Add an option '--allow-process-stop' to show techsupport cli command and '-a' to generate_dump script
- How to verify it
Perform show techsupport --allow-process-stop to collect extra hardware registers information which may require system interruption.
- Previous command output (if the output of a command-line utility has changed)
N/A
- New command output (if the output of a command-line utility has changed)
N/A

scripts/generate_dump

@@ -20,6 +20,7 @@ MV=mv
 GREP=grep
 TOUCH=touch
 V=
+ALLOW_PROCESS_STOP=
 NOOP=false
 DO_COMPRESS=true
 CMD_PREFIX=
@@ -763,7 +764,7 @@ main() {
     # run 'hw-management-generate-dump.sh' script and save the result file
     HW_DUMP_FILE=/usr/bin/hw-management-generate-dump.sh
     if [ -f "$HW_DUMP_FILE" ]; then
-      /usr/bin/hw-management-generate-dump.sh
+      /usr/bin/hw-management-generate-dump.sh $ALLOW_PROCESS_STOP
       save_file "/tmp/hw-mgmt-dump*" "hw-mgmt" false
       rm -f /tmp/hw-mgmt-dump*
     else
@@ -827,6 +828,9 @@ OPTIONS
         passed to them
     -n
         Noop mode. Don't actually create anything, just echo what would happen
+    -a
+        Allow any process stop. This allows for collection of platform HW register
+        status, which may require potential system interruption
     -z
         Don't compress the tar at the end.
     -s DATE
@@ -837,7 +841,7 @@ OPTIONS
 EOF
 }
 
-while getopts ":xnvhzs:" opt; do
+while getopts ":xnvhzsa:" opt; do
     case $opt in
         x)
             # enable bash debugging
@@ -868,6 +872,9 @@ while getopts ":xnvhzs:" opt; do
         z)
             DO_COMPRESS=false
             ;;
+        a)
+            ALLOW_PROCESS_STOP="-a"
+            ;;
         s)
             SINCE_DATE="${OPTARG}"
             # validate date expression

show/main.py

@@ -1128,11 +1128,16 @@ def users(verbose):
 @cli.command()
 @click.option('--since', required=False, help="Collect logs and core files since given date")
 @click.option('--verbose', is_flag=True, help="Enable verbose output")
-def techsupport(since, verbose):
+@click.option('--allow-process-stop', is_flag=True, help="Dump additional data which may require system interruption")
+def techsupport(since, verbose, allow_process_stop):
     """Gather information for troubleshooting"""
     cmd = "sudo generate_dump -v"
+    if allow_process_stop:
+        cmd += " -a"
+
     if since:
         cmd += " -s {}".format(since)
+
     run_command(cmd, display_cmd=verbose)