[show_techsupport][pstore] Archive /var/lib/systemd/pstore info to techsupport (sonic-net#3745)

Author: mlok-nokia

scripts/generate_dump

@@ -895,21 +895,66 @@ save_proc() {
 save_sys() {
     trap 'handle_error $? $LINENO' ERR
     local sysfiles="$@"
+    local cp_cmd="sudo cp"
+    
     $MKDIR $V -p $TARDIR/sys
     for f in $sysfiles
     do
         if $NOOP; then
             if [ -e $f ]; then
-                echo "$CP $V -r $f $TARDIR/sys"
+                echo "$cp_cmd $V -r -p $f $TARDIR/sys"
             fi
         else
-            ( [ -e $f ] && $CP $V -r $f $TARDIR/sys ) || echo "$f not found" > $TARDIR/$f
+            ( [ -e $f ] && $cp_cmd $V -r -p $f $TARDIR/sys ) || echo "$f not found" > $TARDIR/$f
         fi
     done
 
     chmod ugo+rw -R $DUMPDIR/$BASE/sys
 }
 
+###############################################################################
+# Given list of pstore directories or files, saves subdirectories and files to tar.
+# Globals:
+#  V
+#  TARDIR
+#  MKDIR
+#  CP
+#  DUMPDIR
+#  TAR
+#  RM
+#  BASE
+#  TARFILE
+#  NOOP
+# Arguments:
+#  *pstorefiles: variable-length list of pstore file paths to save
+# Returns:
+#  None
+###############################################################################
+save_pstore() {
+    trap 'handle_error $? $LINENO' ERR
+    local pstorefiles="$@"
+    PSTORE_DIR_LIST_INFO_FILE="techsupport_pstore_dir_listing_info"
+    $MKDIR $V -p $TARDIR/pstore
+    
+    echo "==================================" > $TARDIR/pstore/$PSTORE_DIR_LIST_INFO_FILE
+    echo "/var/lib/systemd/pstore files info" >> $TARDIR/pstore/$PSTORE_DIR_LIST_INFO_FILE
+    echo "==================================" >> $TARDIR/pstore/$PSTORE_DIR_LIST_INFO_FILE
+    for f in $pstorefiles
+    do
+        if $NOOP; then
+            if [ -e $f ]; then
+                echo "$CP $V -r -p $f/* $TARDIR/pstore"
+            fi
+        else
+            ls --time-style='+%d-%m-%Y %H:%M:%S' -last $f >> $TARDIR/pstore/$PSTORE_DIR_LIST_INFO_FILE
+            ls --time-style='+%d-%m-%Y %H:%M:%S' -last $f/* >> $TARDIR/pstore/$PSTORE_DIR_LIST_INFO_FILE
+            ( [ -e $f ] && $CP $V -r -p $f/* $TARDIR/pstore ) || echo "$f not found" > $TARDIR/$f
+        fi
+    done
+
+    chmod ugo+rw -R $DUMPDIR/$BASE/pstore
+}
+
 ###############################################################################
 # Dump io stats for processes
 # Globals:
@@ -2133,12 +2178,19 @@ main() {
     echo "[ Capture Proc State ] : $(($end_t-$start_t)) msec" >> $TECHSUPPORT_TIME_INFO
     wait
 
-    # capture /sys info - include acpi info
-    save_sys /sys/firmware/acpi/tables &
+    # capture /sys info - include acpi info and pre-process pstore info
+    save_sys /sys/firmware/acpi/tables /sys/fs/pstore &
     end_t2=$(date +%s%3N)
     echo "[ Capture Sys info ] : $(($end_t2-$end_t)) msec" >> $TECHSUPPORT_TIME_INFO
     wait
 
+    # capture /var/lib/systemd/pstore info
+    start_t=$(date +%s%3N)
+    save_pstore /var/lib/systemd/pstore &
+    end_t=$(date +%s%3N)
+    echo "[ Capture pstore info ] : $(($end_t-$start_t)) msec" >> $TECHSUPPORT_TIME_INFO
+    wait
+    
     # Save all the processes within each docker
     save_cmd "show services" services.summary &