bootstrap

   1 #! /bin/sh -
   2 #
   3 #  Builder of custom stages (cross compilers, GNU/Linux distributions)
   4 #
   5 #  Copyright (C) 2014-2017 Matias Andres Fonzo <selk@dragora.org>
   6 #
   7 #  This program is free software: you can redistribute it and/or modify
   8 #  it under the terms of the GNU General Public License as published by
   9 #  the Free Software Foundation, either version 3 of the License, or
  10 #  (at your option) any later version.
  11 #
  12 #  This program is distributed in the hope that it will be useful,
  13 #  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 #  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 #  GNU General Public License for more details.
  16 #
  17 #  You should have received a copy of the GNU General Public License
  18 #  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19
  20 # EXIT STATUS
  21 # 0  = Successful completion
  22 # 1  = Minor common errors (e.g: help usage, support not available)
  23 # 2  = Command execution error
  24 # 3  = Integrity check error for compressed files
  25
  26 PROGRAM="${0##*/}"
  27
  28 # Override locale settings
  29 LC_ALL=C
  30 LANGUAGE=C
  31 export LC_ALL LANGUAGE
  32
  33 # Get physical working directory, absolute path name
  34 CWD=$(CDPATH= cd -P -- $(dirname -- "$0") && printf "$PWD")
  35
  36 #### Functions
  37
  38 usage() {
  39     printf "%s\n" \
  40      "Builder of custom stages (cross compilers, GNU/Linux distributions)"  \
  41      ""                                                                     \
  42      "Usage: $PROGRAM [OPTION]... [FILE]..."                                \
  43      ""                                                                     \
  44      "Defaults for the options are specified in brackets."                  \
  45      ""                                                                     \
  46      "Options:"                                                             \
  47      "  -h          display this help and exit"                             \
  48      "  -V          print version information and exit"                     \
  49      "  -a          target architecture [${arch}]"                          \
  50      "  -j          parallel jobs for the compiler [${jobs}]"               \
  51      "  -k          keep (don't delete) source directory"                   \
  52      "  -o          output directory [${output}]"                           \
  53      "  -s          stage number to build [${stage}]"                       \
  54      ""                                                                     \
  55      "Some influential environment variables:"                              \
  56      "  TMPDIR      temporary directory for sources [${TMPDIR}]"            \
  57      "  BTCC        C compiler command [${BTCC}]"                           \
  58      "  BTCXX       C++ compiler command [${BTCXX}]"                        \
  59      "  BTCFLAGS    C compiler flags [${BTCFLAGS}]"                         \
  60      "  BTCXXFLAGS  C++ compiler flags [${BTCXXFLAGS}]"                     \
  61      "  BTLDFLAGS   linker flags [${BTLDFLAGS}]"                            \
  62      "  VENDOR      vendor name to reflect on the target triplet"           \
  63      ""                                                                     \
  64      "Supported architectures (targets):"
  65      for arch in "${CWD}/targets"/*
  66      do
  67          printf "${arch##*/} "
  68      done
  69     echo
  70 }
  71
  72 version()
  73 {
  74     printf "%s\n" \
  75      "$PROGRAM 3.14" \
  76      "Copyright (C) 2014-2017 Matias Andres Fonzo." \
  77      "License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>" \
  78      "This is free software: you are free to change and redistribute it." \
  79      "There is NO WARRANTY, to the extent permitted by law."
  80 }
  81
  82 warn()
  83 {
  84     echo "$@" 1>&2
  85 }
  86
  87 checkstatus_or_exit()
  88 {
  89     status=$?
  90
  91     if test $status -ne 0
  92     then
  93         echo "Return status = $status" 1>&2
  94         exit ${1-2};    # If not given, defaults to 2
  95     fi
  96
  97     unset status
  98 }
  99
 100 # Function to test and extract tarball files
 101 untar() {
 102     tar tf "$1" > /dev/null && {
 103         cd -- "$2" && tar xpf "$1"
 104     }
 105     checkstatus_or_exit 3
 106 }
 107
 108 #### Warning for good practices
 109
 110 # Recommended practices is to set variables in front of `configure',
 111 # or make(1), see also:
 112 #
 113 # http://www.gnu.org/savannah-checkouts/gnu/autoconf/manual/autoconf-2.69/html_node/Defining-Variables.html
 114 # http://www.gnu.org/savannah-checkouts/gnu/autoconf/manual/autoconf-2.69/html_node/Setting-Output-Variables.html
 115 # http://www.gnu.org/software/make/manual/make.html#Environment
 116
 117 warn_flags()
 118 {
 119     warn "WARNING: Environment variable '$1' is set."   \
 120          "This will be unset to avoid possible risks."  \
 121          ""
 122 }
 123
 124 #### Default values
 125
 126 BTCC="${BTCC:=cc}"
 127 BTCXX="${BTCXX:=c++}"
 128 BTCFLAGS="${BTCFLAGS:=-g0 -Os}"
 129 BTCXXFLAGS="${BTCXXFLAGS:=$BTCFLAGS}"
 130 BTLDFLAGS="${BTLDFLAGS:=-s}"
 131 worktree="$CWD"
 132 arch="$(uname -m)" || exit 2
 133 jobs=1
 134 opt_keep=opt_keep.off
 135 output=${worktree}/OUTPUT.${PROGRAM}
 136 TMPDIR="${TMPDIR:=${output}/sources}"
 137 stage=0
 138
 139 # Compose vendor name adding "-" as suffix
 140 test -n "$VENDOR" && VENDOR="${VENDOR}-"
 141
 142 #### Parse options
 143
 144 while getopts :ha:j:ko:s:V name
 145 do
 146     case $name in
 147     h)
 148         usage
 149         exit 0
 150         ;;
 151     a)
 152         arch="$OPTARG"
 153         ;;
 154     j)
 155         jobs="$OPTARG"
 156         ;;
 157     k)
 158         opt_keep=opt_keep
 159         ;;
 160     o)
 161         output="$OPTARG"
 162         ;;
 163     s)
 164         stage="$OPTARG"
 165         ;;
 166     V)
 167         version
 168         exit 0
 169         ;;
 170     :)
 171         warn "Option '-${OPTARG}' requires an argument"
 172         usage
 173         exit 1
 174         ;;
 175     \?)
 176         warn "Illegal option -- '-${OPTARG}'"
 177         usage
 178         exit 1
 179         ;;
 180     esac
 181 done
 182 shift $(( OPTIND - 1 ))
 183
 184 # Check for environment variables, print warning, unset in any case
 185 test "${CC:+CC_defined}" = CC_defined && warn_flags CC
 186 test "${CXX:+CXX_defined}" = CXX_defined && warn_flags CXX
 187 test "${CFLAGS:+CFLAGS_defined}" = CFLAGS_defined && warn_flags CFLAGS
 188 test "${CXXFLAGS:+CXXFLAGS_defined}" = CXXFLAGS_defined && warn_flags CXXFLAGS
 189 test "${LDFLAGS:+LDFLAGS_defined}" = LDFLAGS_defined && warn_flags LDFLAGS
 190
 191 unset CC CXX CFLAGS CXXFLAGS LDFLAGS warn_flags
 192
 193 # Avoid exportation of 'libSuffix' when a target is loaded
 194 libSuffix=""
 195
 196 # Load target architecture-file
 197
 198 if test -f "${worktree}/targets/$arch"
 199 then
 200     echo "${PROGRAM}: Loading target $arch ..."
 201     . "${worktree}/targets/$arch"
 202 else
 203     warn \
 204      "${PROGRAM}: Target name not recognized -- '${arch}'" \
 205      "See '$0 -h' for more information"
 206     exit 1
 207 fi
 208
 209 # Determine the host to use.
 210
 211 # Set up the host if a C compiler command was exported,
 212 # otherwise, a local `cc' will be used instead
 213
 214 if test -n "$BTCC"
 215 then
 216     host="$(${BTCC} -dumpmachine)" || exit 2
 217 else
 218     host="$(cc -dumpmachine)" || exit 2
 219 fi
 220
 221 # If the host and the target are the same triplet, it won't work.
 222 # We are changing the host if it is really needed
 223
 224 if test "$host" = "$target"
 225 then
 226     # Rename VENDOR to 'cross'.  If empty, 'cross-linux' is added
 227     case "${host%-*-*}" in
 228     *-*)
 229         host="$(echo "$host" | sed -e 's/-[^-]*/-cross/')"
 230         ;;
 231     *)
 232         host="$(echo "$host" | sed -e 's/-[^-]*/-cross-linux/')"
 233         ;;
 234     esac
 235 fi
 236
 237 # Compose variables for the physical output,
 238 # print some useful information
 239
 240 crossdir=${output}/cross/${target}
 241 rootdir=${output}/stage${stage}
 242
 243 printf "%s\n" \
 244  "BTCC: $BTCC"                  \
 245  "BTCXX: $BTCXX"                \
 246  "BTCFLAGS: $BTCFLAGS"          \
 247  "BTCXXFLAGS: $BTCXXFLAGS"      \
 248  "BTLDFLAGS: $BTLDFLAGS"        \
 249  "Host: $host"                  \
 250  "Target: $target"              \
 251  "Output directory: $output"    \
 252  "Cross  directory: $crossdir"  \
 253  "Root   directory: $rootdir"
 254
 255 # Remove write permission for group and other
 256 umask 022
 257
 258 # Create required directories
 259 if test ! -d "$output"
 260 then
 261     mkdir -p -- "$output" || exit 2
 262 fi
 263 if test ! -d "$TMPDIR"
 264 then
 265     mkdir -p -- "$TMPDIR" || exit 2
 266 fi
 267
 268 # Set default path and propagate variables
 269
 270 PATH="${crossdir}/bin:${PATH}"
 271 export PATH VENDOR TMPDIR
 272
 273 # Main loop
 274 for file in "${CWD}/stages/${stage}"/${@:-??-*}
 275 do
 276     file="${file##*/}"
 277
 278     if test ! -f "${CWD}/stages/${stage}/$file"
 279     then
 280         warn "${PROGRAM}: ${stage}/${file}: No such file or stage number"
 281         exit 1
 282     fi
 283     if test ! -x "${CWD}/stages/${stage}/$file"
 284     then
 285         warn "${PROGRAM}: ${stage}/${file}: File not executable, dodging"
 286         continue;
 287     fi
 288
 289     #### Stage pre-settings
 290
 291     # Create sysroot directory, recreating the symlink for the stage 0
 292
 293     if test "$stage" = 0
 294     then
 295         mkdir -p -- "${crossdir}/$target" || exit 2
 296
 297         if test ! -e "${crossdir}/${target}/usr"
 298         then
 299             ln -sf . "${crossdir}/${target}/usr" || exit 2
 300         fi
 301
 302         # Ensure toolchain sanity for multilib purposes
 303         case $arch in
 304         i586 | *x32 | x86_64 )
 305             if test ! -e "${crossdir}/lib" -a -n "$libSuffix"
 306             then
 307                 ln -sf lib${libSuffix} "${crossdir}/lib" || exit 2
 308             fi
 309             ;;
 310         esac
 311     fi
 312
 313     # Create "tools" directory, recreating the symlink for the stage 1
 314     if test "$stage" = 1
 315     then
 316         if test ! -d "${rootdir}/tools"
 317         then
 318             mkdir -p -- "${rootdir}/tools" || exit 2
 319         fi
 320
 321         # Make required symlink
 322         ln -sf "${rootdir}/tools" / || exit 2
 323     fi
 324
 325     #### Load the file containing the instruction
 326
 327     echo "${PROGRAM}: Processing $file from stage $stage ..."
 328
 329     # Exit immediately on any error
 330     set -e
 331
 332     . "${CWD}/stages/${stage}/$file" || checkstatus_or_exit 2
 333
 334     # Deactivate shell option
 335     set +e
 336
 337     # Delete declared directories on the cleanup() function
 338     if test "$opt_keep" != opt_keep
 339     then
 340         if type cleanup 1> /dev/null 2> /dev/null
 341         then
 342             cleanup || checkstatus_or_exit 2
 343             unset cleanup
 344         fi
 345     fi
 346
 347     # Back to the current working directory
 348     cd -- "$CWD" || exit 2
 349 done
 350