hijack.sh: Track dmesg.txt collection

Log dmesg.txt collection and warn if it is empty.

Signed-off-by: Dmitrii Golovanov <dmitrii.golovanov@intel.com>

Author: golowanow

case-lib/hijack.sh

@@ -132,17 +132,28 @@ function func_exit_handler()
         storage_checks || exit_status=1
     fi
 
+    dmesg_txt="$LOG_ROOT/dmesg.txt"
     if [[ "$KERNEL_CHECKPOINT" =~ ^[0-9]{10} ]]; then
         # Do not collect the entire duration of the test but only the
         # last iteration.
-        journalctl_cmd --since=@"$KERNEL_CHECKPOINT" > "$LOG_ROOT/dmesg.txt"
+        dlogi "Save kernel messages since ${KERNEL_CHECKPOINT} to ${dmesg_txt}"
+        journalctl_cmd --since=@"$KERNEL_CHECKPOINT" > "${dmesg_txt}"
     elif [[ "$KERNEL_CHECKPOINT" == "disabled" ]]; then
-        journalctl_cmd > "$LOG_ROOT/dmesg.txt"
+        dlogi "Save all kernel messages to ${dmesg_txt}"
+        journalctl_cmd > "${dmesg_txt}"
     else
        dloge 'Kernel check point "KERNEL_CHECKPOINT" is not properly set'
        dloge "KERNEL_CHECKPOINT=$KERNEL_CHECKPOINT"
        test "$exit_status" -ne 0 || exit_status=1
     fi
+    # Check the dmesg.txt
+    if test -s "${dmesg_txt}"; then
+       wcLog=$(wc -l "${dmesg_txt}")
+       dlogi  "nlines=$wcLog"
+    else
+       dlogw "Empty ${dmesg_txt}"
+    fi
+
     # After log collected, KERNEL_CHECKPOINT will not be used any more
     unset KERNEL_CHECKPOINT