include/instrumentation/syscalls/lttng-syscalls-extract.sh

   1 #!/bin/bash
   2 # SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
   3
   4 set -eu
   5
   6 outfile="${1:-}"
   7
   8 if [ "x$outfile" = "x" ]; then
   9         echo "Specify an output file as first argument, it will be overwritten."
  10         exit 1
  11 fi
  12
  13 cd lttng-syscalls-extractor || exit 1
  14 make
  15 cd - || exit 1
  16
  17 # Generate a random string to use as an identifier
  18 ident=$(tr -dc 'a-zA-Z0-9' < /dev/urandom | fold -w 8 | head -n1)
  19
  20 sudo insmod ./lttng-syscalls-extractor/lttng-syscalls-extractor.ko ident="$ident" || true
  21
  22 sudo dmesg | sed -n -e 's/\(\[.*\] \)\?'"$ident"'//p' > "$outfile"
  23
  24 # Make sure we have both the start and end markers
  25 if grep -q -- '---START---' "$outfile"; then
  26         sed -i '/^---START---/d' "$outfile"
  27 else
  28         echo "Error: Start marker missing from dmesg output, your kernel log buffer is probably too small, set CONFIG_LOG_BUF_SHIFT to a bigger value."
  29         exit 1
  30 fi
  31
  32 if grep -q -- '---END---' "$outfile"; then
  33         sed -i '/^---END---/d' "$outfile"
  34 else
  35         echo "Error: End marker missing from dmesg output, something went wrong."
  36         exit 1
  37 fi