scripts/built-in.sh

   1 #!/bin/bash
   2 # SPDX-License-Identifier: (GPL-2.0-only OR LGPL-2.1-only)
   3
   4 set -e
   5
   6 usage() {
   7         echo "usage: $0 <kernel source tree>" >&2
   8         exit 1
   9 }
  10
  11 [ "$#" -eq 1 ] || usage
  12 KERNEL_DIR="$(readlink --canonicalize-existing "$1")"
  13
  14 # Symlink the lttng-modules directory in the kernel source
  15 ln -sf "$(pwd)" "${KERNEL_DIR}/lttng"
  16
  17 # Graft ourself to the kernel build system
  18 echo 'source "lttng/src/Kconfig"' >> "${KERNEL_DIR}/Kconfig"
  19
  20 # In kernel v6.1, subdirectories were moved to Kbuild
  21 if grep -qE '^obj-y[[:space:]]+\+= kernel/' "${KERNEL_DIR}/Kbuild"; then
  22         echo 'obj-y += lttng/' >> "${KERNEL_DIR}/Kbuild"
  23 else
  24         sed -i 's#+= kernel/#+= kernel/ lttng/#' "${KERNEL_DIR}/Makefile"
  25 fi
  26
  27 echo >&2
  28 echo "    $0: done." >&2
  29 echo "    $0: now you can build the kernel with LTTng support." >&2
  30 echo "    $0: make sure you enable it (CONFIG_LTTNG) before building." >&2
  31 echo >&2