LXR linux/kernel/gen

   1#!/bin/bash
   2# SPDX-License-Identifier: GPL-2.0
   3
   4# This script generates an archive consisting of kernel headers
   5# for CONFIG_IKHEADERS.
   6set -e
   7sfile="$(readlink -f "$0")"
   8outdir="$(pwd)"
   9tarfile=$1
  10cpio_dir=$outdir/$tarfile.tmp
  11
  12dir_list="
  13include/
  14arch/$SRCARCH/include/
  15"
  16
  17# Support incremental builds by skipping archive generation
  18# if timestamps of files being archived are not changed.
  19
  20# This block is useful for debugging the incremental builds.
  21# Uncomment it for debugging.
  22# if [ ! -f /tmp/iter ]; then iter=1; echo 1 > /tmp/iter;
  23# else iter=$(($(cat /tmp/iter) + 1)); echo $iter > /tmp/iter; fi
  24# find $src_file_list -name "*.h" | xargs ls -l > /tmp/src-ls-$iter
  25# find $obj_file_list -name "*.h" | xargs ls -l > /tmp/obj-ls-$iter
  26
  27# include/generated/compile.h is ignored because it is touched even when none
  28# of the source files changed. This causes pointless regeneration, so let us
  29# ignore them for md5 calculation.
  30pushd $srctree > /dev/null
  31src_files_md5="$(find $dir_list -name "*.h"                        |
  32                grep -v "include/generated/compile.h"              |
  33                grep -v "include/generated/autoconf.h"             |
  34                xargs ls -l | md5sum | cut -d ' ' -f1)"
  35popd > /dev/null
  36obj_files_md5="$(find $dir_list -name "*.h"                        |
  37                grep -v "include/generated/compile.h"              |
  38                grep -v "include/generated/autoconf.h"             |
  39                xargs ls -l | md5sum | cut -d ' ' -f1)"
  40# Any changes to this script will also cause a rebuild of the archive.
  41this_file_md5="$(ls -l $sfile | md5sum | cut -d ' ' -f1)"
  42if [ -f $tarfile ]; then tarfile_md5="$(md5sum $tarfile | cut -d ' ' -f1)"; fi
  43if [ -f kernel/kheaders.md5 ] &&
  44        [ "$(cat kernel/kheaders.md5|head -1)" == "$src_files_md5" ] &&
  45        [ "$(cat kernel/kheaders.md5|head -2|tail -1)" == "$obj_files_md5" ] &&
  46        [ "$(cat kernel/kheaders.md5|head -3|tail -1)" == "$this_file_md5" ] &&
  47        [ "$(cat kernel/kheaders.md5|tail -1)" == "$tarfile_md5" ]; then
  48                exit
  49fi
  50
  51if [ "${quiet}" != "silent_" ]; then
  52       echo "  GEN     $tarfile"
  53fi
  54
  55rm -rf $cpio_dir
  56mkdir $cpio_dir
  57
  58pushd $srctree > /dev/null
  59for f in $dir_list;
  60        do find "$f" -name "*.h";
  61done | cpio --quiet -pd $cpio_dir
  62popd > /dev/null
  63
  64# The second CPIO can complain if files already exist which can
  65# happen with out of tree builds. Just silence CPIO for now.
  66for f in $dir_list;
  67        do find "$f" -name "*.h";
  68done | cpio --quiet -pd $cpio_dir >/dev/null 2>&1
  69
  70# Remove comments except SDPX lines
  71find $cpio_dir -type f -print0 |
  72        xargs -0 -P8 -n1 perl -pi -e 'BEGIN {undef $/;}; s/\/\*((?!SPDX).)*?\*\///smg;'
  73
  74tar -Jcf $tarfile -C $cpio_dir/ . > /dev/null
  75
  76echo "$src_files_md5" >  kernel/kheaders.md5
  77echo "$obj_files_md5" >> kernel/kheaders.md5
  78echo "$this_file_md5" >> kernel/kheaders.md5
  79echo "$(md5sum $tarfile | cut -d ' ' -f1)" >> kernel/kheaders.md5
  80
  81rm -rf $cpio_dir
  82