annotate build.sh @ 1228:8a88cae14011

Remove RW_SYSTEM_IMAGE option. The gentoo-stage1 build shows how to setup a writeable chroot, and the FAQ says how to build a writeable system image. I'm not shipping two different system iamges, then I'd have to explain it and it's not worth the confusion.
author Rob Landley <rob@landley.net>
date Tue, 24 Aug 2010 02:53:11 -0500
parents 19f3be2b4d04
children 7eabfa815c90
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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, simple-root-filesystem,
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7 # native-compiler, root-filesystem, 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 simplest set of stages is:
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15 # download, simple-cross-compiler, simple-root-filesystem, system-image.
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16 #
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17 # That skips sanitizing the host environment, and skips building the native
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18 # compiler. It builds a system image containing just enough code to boot to
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19 # a command prompt. To invoke that, do:
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20 #
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21 # NO_HOST_TOOLS=1 NO_NATIVE_COMPILER=1 ./build.sh $TARGET
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23 # The optional cross-compiler stage (after simple-cross-compiler but before
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24 # simple-root-filesystem) creates a more powerful and portable cross compiler
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25 # that can be used to cross compile more stuff (if you're into that sort of
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26 # thing). To enable that:
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28 # CROSS_HOST_ARCH=i686 ./build.sh $TARGET
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29
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30 # Where "i686" is whichever target you want the new cross compiler to run on.
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32 # Start with some housekeeping stuff. If this script was run with no
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33 # arguments, list available architectures out of sources/targets.
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34
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35 if [ $# -ne 1 ]
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36 then
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37 echo "Usage: $0 TARGET"
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38
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39 echo "Supported architectures:"
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40 cd sources/targets
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41 ls
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42
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43 exit 1
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44 fi
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45 ARCH="$1"
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47 # Use environment variables persistently set in the config file.
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48
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49 [ -e config ] && source config
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51 # Allow the output directory to be overridden. This hasn't been tested in
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52 # forever and probably doesn't work.
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53
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54 [ -z "$BUILD" ] && BUILD="build"
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55
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56 # Very simple dependency tracking: skip stages that have already been done
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57 # (because the tarball they create is already there).
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59 # If you need to rebuild a stage (and everything after it), delete its
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60 # tarball out of "build" and re-run build.sh.
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62 not_already()
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63 {
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64 if [ -f "$BUILD/$1-$ARCH.tar.bz2" ]
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65 then
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66 echo "=== Skipping $1-$ARCH (already there)"
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67 return 1
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68 fi
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69
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70 return 0
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71 }
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72
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73 # The first two stages (download.sh and host-tools.sh) are architecture
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74 # independent. In order to allow multiple builds in parallel, re-running
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75 # them after they've already completed must be a safe NOP.
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77 # Download source code.
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78
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79 time ./download.sh || exit 1
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80
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81 # Build host tools. This populates a single directory with every command the
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82 # build needs, so we can ditch the host's $PATH afterwards.
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84 if [ -z "$NO_HOST_TOOLS" ]
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85 then
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86 time ./host-tools.sh || exit 1
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87 fi
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88
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89 # Do we need to build the simple cross compiler?
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90
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91 if not_already simple-cross-compiler
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92 then
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93 # If we need to build cross compiler, assume root filesystem is stale.
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94
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95 rm -rf "$BUILD/simple-root-filesystem-$ARCH.tar.bz2"
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96
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97 time ./simple-cross-compiler.sh "$ARCH" || exit 1
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98 fi
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99
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100 # Optionally, we can build a more capable statically linked compiler via
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101 # canadian cross. (It's more powerful than we need here, but if you're going
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102 # to use the cross compiler in other contexts this is probably what you want.)
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103
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104 if [ ! -z "$CROSS_HOST_ARCH" ] && not_already cross-compiler
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105 then
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106 rm -rf "$BUILD/simple-root-filesystem-$ARCH.tar.bz2"
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107
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108 # Build the host compiler if necessary
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109
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110 if ARCH="$CROSS_HOST_ARCH" not_already simple-cross-compiler
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111 then
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112 time ./simple-cross-compiler.sh "$CROSS_HOST_ARCH" || exit 1
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113 fi
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114
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115 time ./cross-compiler.sh "$ARCH" || exit 1
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116 fi
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117
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118 # Build the basic root filesystem.
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119
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120 if not_already simple-root-filesystem
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121 then
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122 # If we need to build root filesystem, assume root-filesystem and
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123 # system-image are stale.
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124
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125 rm -rf "$BUILD/root-filesystem-$ARCH.tar.bz2"
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126 rm -rf "$BUILD/system-image-$ARCH.tar.bz2"
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127
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128 time ./simple-root-filesystem.sh "$ARCH" || exit 1
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129
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130 fi
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131
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132 # Build a native compiler. It's statically linked by default so it can
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133 # run on an arbitrary host system.
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134
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135 if not_already native-compiler && [ -z "$NO_NATIVE_COMPILER" ]
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136 then
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137 rm -rf "$BUILD/root-filesystem-$ARCH.tar.bz2"
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138
e5f9681a8b3c Lots of comment updates. Add a NO_HOST_TOOLS=1 config option, and a few "time" calls to stages that didn't have them. Put native-compiler.sh after root-filesystem.sh in build so it's slightly easier to document.
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139 time ./native-compiler.sh "$ARCH" || exit 1
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140 fi
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141
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142 # Install the native compiler into the root filesystem, if necessary.
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143
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144 if not_already root-filesystem && [ -z "$NO_NATIVE_COMPILER" ]
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145 then
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146 rm -rf "$BUILD/system-image-$ARCH.tar.bz2"
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147
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148 time ./root-filesystem.sh "$ARCH" || exit 1
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149 fi
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150
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151 # Package it up into something qemu can boot.
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152
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153 if not_already system-image
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154 then
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155 time ./system-image.sh $1 || exit 1
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156 fi