* [saidump]

        •       Saidump for DNX-SAI sonic-net/sonic-buildimage#13561

        Solution and modification:
        To use the redis-db SAVE option to save the snapshot of DB each time and recover later, instead of looping through each entry in the table and saving it.

        (1) Updated sonic-buildimage/build_debian.sh, to install Python library rdbtools into the host.
        (2) Updated sonic-buildimage/src/sonic-sairedis/saidump/saidump.cpp, add a new option -r, which updates the rdbtools's output-JSON files' format.
        (3) Add a new script file: files/scripts/saidump.sh, to do the below steps
          For each ASIC0, such as ASIC0,

          1. Save the Redis data.
          sudo sonic-db-cli -n asic$1 SAVE > /dev/null

          2. Move dump files to /var/run/redisX/
          docker exec database$1 sh -c "mv /var/lib/redis/dump.rdb /var/run/redis$1/"

          3. Run rdb command to convert the dump files into JSON files
          sudo python /usr/local/bin/rdb --command json  /var/run/redis$1/dump.rdb | sudo tee /var/run/redis$1/dump.json > /dev/null

          4. Run saidump -r to update the JSON files' format as same as the saidump before. Then we can get the saidump result in standard output.
          docker exec syncd$1 sh -c "saidump -r /var/run/redis$1/dump.json"

          5. clear
          sudo rm -f /var/run/redis$1/dump.rdb
          sudo rm -f /var/run/redis$1/dump.json

        (4) Update sonic-buildimage/src/sonic-utilities/scripts/generate_dump, replace saidump with saidump.sh

scripts/generate_dump

@@ -892,7 +892,7 @@ save_saidump() {
 # Returns:
 #  None
 ###############################################################################
-save_saidump_by_save_cmd() {
+save_saidump_by_redis_save_cmd() {
     trap 'handle_error $? $LINENO' ERR
     if [[ ( "$NUM_ASICS" == 1 ) ]] ; then
         save_cmd "saidump.sh" "saidump"
@@ -1813,7 +1813,7 @@ main() {
     if [[ "$device_type" != "SpineRouter" ]]; then
         save_saidump
     else
-        save_saidump_by_save_cmd
+        save_saidump_by_redis_save_cmd
     fi
 
     if [ "$asic" = "barefoot" ]; then