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annotate build.sh @ 1730:7f1b9fb1099e draft

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Move simple-root-filesystem.sh to root-filesystem.sh
author Rob Landley <rob@landley.net>
date Tue, 10 Feb 2015 21:02:53 -0600
parents b89324905ca2
children 1acbe7e78d9d
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1 #!/bin/bash
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2
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3 # Run all the steps needed to build a system image from scratch.
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4
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5 # The default set of stages run by this script is (in order):
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6 # download, host-tools, simple-cross-compiler, root-filesystem,
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7 # native-compiler, system-image.
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9 # That sanitizes the host build environment and builds a cross compiler,
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10 # cross compiles a root filesystem and a native toolchain for the target,
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11 # and finally packages the root filesystem up into a system image bootable
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12 # by qemu.
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14 # The optional cross-compiler stage (after simple-cross-compiler but before
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15 # root-filesystem) creates a more powerful and portable cross compiler
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16 # that can be used to cross compile more stuff (if you're into that sort of
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17 # thing). To enable that:
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18
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19 # CROSS_COMPILER_HOST=i686 ./build.sh $TARGET
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20
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21 # Where "i686" is whichever target you want the new cross compiler to run on.
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22
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23 # The simplest set of stages (if you run them yourself) is:
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24 # download, simple-cross-compiler, root-filesystem, system-image.
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25
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26 # If this script was run with no arguments, list available architectures
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27
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28 [ ! -z "$2" ] && REBUILD="$2"
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29
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30 if [ $# -lt 1 ] || [ $# -gt 2 ] || [ ! -e sources/targets/"$1" ]
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31 then
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32 echo
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33 echo "Usage: $0 TARGET [REBUILD_FROM_STAGE]"
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34 echo
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35 echo "Supported architectures:"
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36 ls sources/targets
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37 echo
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38 echo "Build stages:"
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39 sed -n 's/#.*//;s@.*[.]/\([^.]*\)[.]sh.*@\1@p' "$0" | uniq | xargs echo
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40 echo
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42 exit 1
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43 fi
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44 ARCH="$1"
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45
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46 # Use environment variables persistently set in the config file.
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47
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48 [ -e config ] && source config
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50 # Allow the output directory to be overridden. This hasn't been tested in
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51 # forever and probably doesn't work.
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52
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53 [ -z "$BUILD" ] && BUILD="build"
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54
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55 # Very simple dependency tracking: skip stages that have already been done
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56 # (because the tarball they create is already there).
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58 # If you need to rebuild a stage (and everything after it), delete its
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59 # tarball out of "build" and re-run build.sh.
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60
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61 not_already()
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62 {
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63 [ "$REBUILD" == "$1" ] && zap "$1"
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64
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65 if [ -f "$BUILD/$1-$ARCH.tar.bz2" ]
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66 then
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67 echo "=== Skipping $1-$ARCH (already there)"
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68 return 1
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69 fi
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70
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71 return 0
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72 }
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73
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74 zap()
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75 {
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76 for i in "$@"
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77 do
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78 rm -f "$BUILD/$i-$ARCH.tar.bz2"
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79 done
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80 }
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81
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82 # The first two stages (download.sh and host-tools.sh) are architecture
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83 # independent. In order to allow multiple builds in parallel, re-running
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84 # them after they've already completed must be a safe NOP.
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85
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86 # Download source code.
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87
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88 time ./download.sh || exit 1
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89
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90 # Build host tools. This populates a single directory with every command the
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91 # build needs, so we can ditch the host's $PATH afterwards.
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93 if [ -z "$NO_HOST_TOOLS" ]
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94 then
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95 time ./host-tools.sh || exit 1
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96 fi
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97
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98 # Do we need to build the simple cross compiler?
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99
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100 if not_already simple-cross-compiler
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101 then
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102 # If we need to build cross compiler, assume root filesystem is stale.
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103
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104 zap root-filesystem cross-compiler native-compiler linux-kernel
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105
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106 time ./simple-cross-compiler.sh "$ARCH" || exit 1
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107 fi
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108
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109 # Optionally, we can build a more capable statically linked compiler via
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110 # canadian cross. (It's more powerful than we need here, but if you're going
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111 # to use the cross compiler in other contexts this is probably what you want.)
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112
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113 if [ ! -z "$CROSS_COMPILER_HOST" ] && not_already cross-compiler
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114 then
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115 zap root-filesystem native-compiler linux-kernel
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116
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117 # Build the host compiler if necessary
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118
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119 if ARCH="$CROSS_COMPILER_HOST" not_already simple-cross-compiler
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120 then
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121 time ./simple-cross-compiler.sh "$CROSS_COMPILER_HOST" || exit 1
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122 fi
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123
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124 time ./cross-compiler.sh "$ARCH" || exit 1
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125 fi
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126
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127 # Build the basic root filesystem.
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128
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129 if not_already root-filesystem
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130 then
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131 zap system-image
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132 [ "$SYSIMAGE_TYPE" == rootfs ] && zap linux-kernel
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133
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134 time ./root-filesystem.sh "$ARCH" || exit 1
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135 fi
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136
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137 # Build a native compiler. It's statically linked by default so it can
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138 # run on an arbitrary host system.
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139
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140 if not_already native-compiler
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141 then
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142 zap system-image
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143
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144 time ./native-compiler.sh "$ARCH" || exit 1
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145 fi
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146
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147 # Package it all up into something qemu can boot.
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148
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149 if not_already system-image
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150 then
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151 time ./system-image.sh $1 || exit 1
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152 fi