[generate_dump] allow to extend dump with plugin scripts. (sonic-net#…

…1335)

- What I did
Added support for tech support extension scripts.

- How I did it
It looks at /usr/bin/debug-dump for scripts, if it finds one it will execute them and save the output to dump/ folder.

- How to verify it
Write a simple scripts that outputs something and place it under /usr/bin/debug-dump/

Signed-off-by: Stepan Blyshchak <[email protected]>

scripts/generate_dump

@@ -32,6 +32,7 @@ DUMPDIR=/var/dump
 TARDIR=$DUMPDIR/$BASE
 TARFILE=$DUMPDIR/$BASE.tar
 LOGDIR=$DUMPDIR/$BASE/dump
+PLUGINS_DIR=/usr/local/bin/debug-dump
 NUM_ASICS=1
 HOME=${HOME:-/root}
 USER=${USER:-root}
@@ -138,6 +139,7 @@ save_bcmcmd_all_ns() {
 #  cmd: The command to run. Make sure that arguments with spaces have quotes
 #  filename: the filename to save the output as in $BASE/dump
 #  do_gzip: (OPTIONAL) true or false. Should the output be gzipped
+#  save_stderr: (OPTIONAL) true or false. Should the stderr output be saved
 # Returns:
 #  None
 ###############################################################################
@@ -148,10 +150,17 @@ save_cmd() {
     local filename=$2
     local filepath="${LOGDIR}/$filename"
     local do_gzip=${3:-false}
+    local save_stderr=${4:-true}
     local tarpath="${BASE}/dump/$filename"
     local timeout_cmd="timeout --foreground ${TIMEOUT_MIN}m"
+    local redirect="&>"
     [ ! -d $LOGDIR ] && $MKDIR $V -p $LOGDIR
 
+    if ! $save_stderr
+    then
+        redirect=">"
+    fi
+
     # eval required here to re-evaluate the $cmd properly at runtime
     # This is required if $cmd has quoted strings that should be bunched
     # as one argument, e.g. vtysh -c "COMMAND HERE" needs to have
@@ -171,9 +180,9 @@ save_cmd() {
         fi
     else
         if $NOOP; then
-            echo "${timeout_cmd} $cmd &> '$filepath'"
+            echo "${timeout_cmd} $cmd $redirect '$filepath'"
         else
-            eval "${timeout_cmd} $cmd" &> "$filepath"
+            eval "${timeout_cmd} $cmd" "$redirect" "$filepath"
             if [ $? -ne 0 ]; then
                 echo "Command: $cmd timedout after ${TIMEOUT_MIN} minutes."
             fi
@@ -1076,6 +1085,12 @@ main() {
     save_cmd "docker ps -a" "docker.ps"
     save_cmd "docker top pmon" "docker.pmon"
 
+    local -r dump_plugins="$(find ${PLUGINS_DIR} -type f -executable)"
+    for plugin in $dump_plugins; do
+        # save stdout output of plugin and gzip it
+        save_cmd "$plugin" "$(basename $plugin)" true false
+    done
+
     save_saidump
 
     if [[ "$asic" = "mellanox" ]]; then