make

   1 #!/bin/sh
   2
   3 # this script is brutal and verbose, has no tricks and is quite linear, then
   4 # quite easy to deal with
   5 # for the moment, it's hardcoded for a gcc toolchain... BAD! Since now
   6 # gcc is a c++ piece of shit
   7
   8 # stolen from ffmpeg configure like a pig
   9 set -e
  10
  11 # prevent locale nonsense from breaking basic text processing
  12 LC_ALL=C
  13 export LC_ALL
  14
  15 init_file_name=init
  16
  17 init_ulinux_src_files='
  18 ulinux/utils/ascii/string/vsprintf.c
  19 ulinux/utils/mem.c
  20 ulinux/utils/ascii/string/conv/decimal/decimal.c
  21 '
  22
  23 init_src_files="
  24 uevents.c
  25 modules.c
  26 uevent.c
  27 init.c
  28 ramfs.c
  29 $init_ulinux_src_files
  30 "
  31
  32 sep_start()
  33 {
  34 printf '###############################################################################\n'
  35 }
  36
  37 sep_end()
  38 {
  39 printf '###############################################################################\n\n'
  40 }
  41
  42 subsep_start()
  43 {
  44 printf '*******************************************************************************\n'
  45 }
  46
  47 subsep_end()
  48 {
  49 printf '*******************************************************************************\n'
  50 }
  51
  52 ################################################################################
  53
  54 is_in()
  55 {
  56 value=$1
  57 shift
  58 for var in $*; do
  59         [ $var = $value ] && return 0
  60 done
  61 return 1
  62 }
  63
  64 die_unknown(){
  65 echo "Unknown option \"$1\"."
  66 echo "See $0 --help for available options."
  67 exit 1
  68 }
  69
  70 set_default(){
  71 for opt; do
  72         eval : \${$opt:=\$${opt}_default}
  73 done
  74 }
  75
  76 CMDLINE_SET='
  77 linux_build_dir
  78 kernel_modules_base_dir
  79 init_cpp
  80 init_cc
  81 init_ccld
  82 init_ulinux_arch
  83 uevents_timeout
  84 gen_init_cpio
  85 kernel_release
  86 extra_modules
  87 pkg_config
  88 elf_interpreter
  89 '
  90 # command line set defaults
  91 # if the root is not around in less than 4s, something is really wrong
  92 uevents_timeout_default=4000
  93 gen_init_cpio_default='$linux_build_dir/usr/gen_init_cpio'
  94 linux_build_dir_default=/usr/src/linux
  95 #-------------------------------------------------------------------------------
  96 # this defaults are for gcc, tested with version 4.7.3. You will need to
  97 # override those for you compiler (tinycc/open64/pcc...). additionnally, source
  98 # support for different toolchains is not done
  99 # since we use standard C runtime libs, be nice with the C runtime
 100 init_cpp_default='gcc -E -Wall -Wextra'
 101 init_cc_default='gcc -Wall -Wextra -Wno-implicit-fallthrough -std=gnu99 -O2 -c'
 102 init_ccld_default='gcc -Wl,-s -static'
 103 #-------------------------------------------------------------------------------
 104 kernel_modules_base_dir_default=/
 105 kernel_release_default=$(uname -r)
 106 init_ulinux_arch_default=$(uname -m | sed -e s/i.86/i386/ -e s/parisc64/parisc/ -e s/sun4u/sparc64/ -e s/arm.*/arm/ -e s/sa110/arm/ -e s/sh.*/sh/)
 107 extra_modules_default=
 108 pkg_config_default=pkg-config
 109 elf_interpreter_default=
 110
 111 set_default $CMDLINE_SET
 112
 113 show_help()
 114 {
 115 cat <<EOF
 116 Usage: make [options] [operations]
 117
 118 default is to build the the initramfs xz compressed cpio archive:
 119
 120 Options: [defaults in brackets after descriptions]
 121
 122 Help options:
 123   --help                               print this message
 124
 125 Standard options:
 126   --lib-path-list=LIB_PATH_LIST        colon separated paths to look for target libraries
 127   --uevents-timeout=UEVENTS_TIMEOUT    uevents timeout in ms looking up for root block device to go online [$uevents_timeout]
 128   --quiet                              init will be silenced (output code compiled out)
 129   --linux-build-dir=DIR                where to find the target linux build tree [$linux_build_dir_default]
 130   --kernel-release=RELEASE             the linux releases version [$kernel_release]
 131   --kernel-modules-base-dir=DIR        the base dir for linux modules and support files [$kernel_modules_base_dir]
 132   --extra-modules=EXTRA_MODULES        coma separated list of extra module to probe
 133
 134 Advanced options:
 135   --gen-init-cpio=GEN_INIT_CPIO_PATH   use this linux host tool to build the linux cpio initramfs [$gen_init_cpio_default]
 136   --pkg-config=PKG_CONFIG              use PKG_CONFIG pkg-config command for target libraries [$pkg_config_default]
 137   --init-cpp=CPP                       use CPP compiler command line CPP for target init process [$init_cpp_default]
 138   --init-cc=CC                         use C compiler command line CC for target init process objects [$init_cc_default]
 139   --init-ccld=CCLD                     use compiler driver linker command line CCLD for target init process [$init_ccld_default]
 140   --init-ulinux-arch=ARCH              use ulinux ARCH for target init process [$init_ulinux_arch]
 141 EOF
 142 exit 0
 143 }
 144
 145 ################################################################################
 146
 147 for opt do
 148         optval="${opt#*=}"
 149         case "$opt" in
 150                 --help|-h) show_help
 151                 ;;
 152                 --quiet) CPPFLAGS="$CPPFLAGS -DQUIET"
 153                 ;;
 154                 *)
 155                         optname=${opt%%=*}
 156                         optname=${optname#--}
 157                         optname=$(echo "$optname" | sed 's/-/_/g')
 158                         if is_in $optname $CMDLINE_SET; then
 159                                 eval $optname='$optval'
 160                         else
 161                                 die_unknown $opt
 162                         fi
 163                 ;;
 164         esac
 165 done
 166
 167 ################################################################################
 168
 169 sep_start;echo 'looking for source path:'
 170 if test -f make; then
 171         src_path=.
 172 else
 173         src_path=$(cd $(dirname "$0"); pwd)
 174         echo "$src_path" | grep -q '[[:blank:]]' &&
 175                 die "out of tree builds are impossible with whitespace in source path."
 176 fi
 177 echo "source path is $src_path";sep_end
 178
 179 ################################################################################
 180
 181 sep_start;echo 'checking libkmod and libblkid pkgconfig support:'
 182 if $pkg_config --exists libkmod blkid; then
 183         echo "found pkg-config files for libkmod and libblkid"
 184 else
 185         echo "missing pkg-config file for libkmod or libblkid"
 186         exit 1
 187 fi
 188 sep_end
 189
 190 ################################################################################
 191
 192 # define variable in source
 193 CPPFLAGS="$CPPFLAGS -DUEVENTS_TIMEOUT=$uevents_timeout"
 194 CPPFLAGS="$CPPFLAGS $($pkg_config --cflags-only-I libkmod blkid)"
 195 CFLAGS="$CFLAGS $($pkg_config --cflags-only-other libkmod blkid)"
 196 LIBS="$($pkg_config --libs --static libkmod blkid) $LIBS"
 197
 198 ################################################################################
 199
 200 sep_start;echo 'configure ulinux src tree for target arch:'
 201 rm -f $src_path/ulinux/arch
 202 ln -s archs/$init_ulinux_arch $src_path/ulinux/arch
 203 echo "init ulinux arch is $init_ulinux_arch"
 204 sep_end
 205
 206 ################################################################################
 207
 208 # generated some code/headers
 209
 210 sep_start
 211 revision=$(echo "$kernel_release" | egrep -o '^[[:digit:]]+\.[[:digit:]]+')
 212 . $src_path/$revision
 213 printf "linux revision is $revision, $src_path/$revision was sourced:\n--------\n"
 214 cat $src_path/$revision
 215 echo '--------'
 216 sep_end
 217
 218 # those modules are all loaded before anything else
 219 sep_start;echo 'generate static module list:'
 220 $src_path/script/static_modules_h.sh $extra_modules $DISK_MODULES \
 221                                                              >./static_modules.h
 222 cat ./static_modules.h
 223 sep_end
 224
 225 ################################################################################
 226
 227 sep_start;echo 'C preprocess init src files:'
 228 for init_src_file in $init_src_files
 229 do
 230         init_pp_c_file=${init_src_file%.c}.pp.c
 231         echo "INIT_CPP $init_src_file->$init_pp_c_file"
 232         mkdir -p $(dirname $init_pp_c_file)
 233         $init_cpp       -o $init_pp_c_file              \
 234                         $CPPFLAGS                       \
 235                         -I.                             \
 236                         -I$src_path                     \
 237                         $src_path/$init_src_file
 238         init_pp_c_files="$init_pp_c_file $init_pp_c_files"
 239 done
 240 sep_end
 241
 242 ################################################################################
 243
 244 sep_start;echo 'compile init preprocessed src files:'
 245 for init_pp_c_file in $init_pp_c_files
 246 do
 247         init_obj_file=${init_pp_c_file%.pp.c}.o
 248         echo "INIT_CC $init_pp_c_file-->$init_obj_file"
 249         $init_cc $CFLAGS -o $init_obj_file $init_pp_c_file
 250         init_obj_files="$init_obj_file $init_obj_files"
 251 done
 252 sep_end
 253
 254 ################################################################################
 255
 256 sep_start;echo 'link the init objects to produce the init binary:'
 257 echo "INIT_CCLD $init_file_name"
 258 $init_ccld -o $init_file_name $init_obj_files $LIBS
 259 sep_end
 260
 261 ################################################################################
 262
 263 sep_start;echo 'generate the cpio source file:'
 264 sed -e "s:@INIT_PATH@:$(readlink -f  $init_file_name):" "$src_path/cpio.in" >cpio
 265 echo "dir /lib/modules/$kernel_release 0755 0 0">>cpio
 266
 267 modules=$HW_MODULES,$DISK_MODULES,$FS_MODULES
 268 if test -n "$extra_modules";then
 269         modules=$modules,$extra_modules
 270 fi
 271
 272 subsep_start
 273 #add proper entries in the cpio definition file related to linux modules
 274 $src_path/script/cpio_modules_add.sh $kernel_modules_base_dir $kernel_release \
 275                                                                  $modules ./cpio
 276 subsep_end
 277
 278 printf "cpio source file is:\n--------\n"
 279 cat cpio
 280 echo '--------'
 281 sep_end
 282
 283 ################################################################################
 284
 285 sep_start;echo 'generating and compressing the cpio archive'
 286 e_gen_init_cpio=$(eval echo "$gen_init_cpio")
 287 $e_gen_init_cpio cpio >${kernel_release}.cpio
 288 xz --force --check=crc32 --extreme --stdout ${kernel_release}.cpio >${kernel_release}.cpio.xz
 289 sep_end