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annotate sources/utility_functions.sh @ 1376:a6d18adf198d

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Added tag 1.0.2 for changeset a9685aea2a2c
author Rob Landley <rob@landley.net>
date Tue, 14 Jun 2011 20:48:07 -0500
parents 9252453c40d0
children e26390768b3c
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1 #!/bin/echo "This file is sourced, not run"
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2
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3 # This file contains generic functions, presumably reusable in other contexts.
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4
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5 # Unset all environment variables that we don't know about, in case some crazy
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6 # person already exported $CROSS_COMPILE, $ARCH, $CDPATH, or who knows what
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7 # else. It's hard to know what might drive some package crazy, so use a
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8 # whitelist.
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9
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10 sanitize_environment()
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11 {
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12 # Which variables are set in config?
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13
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14 TEMP=$(echo $(sed -n 's/.*export[ \t]*\([^=]*\)=.*/\1/p' config) | sed 's/ /,/g')
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15
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16 # What other variables should we keep?
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17
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18 TEMP="$TEMP,LANG,PATH,SHELL,TERM,USER,USERNAME,LOGNAME,PWD,EDITOR,HOME,DISPLAY,_"
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19 TEMP="$TEMP,TOPSHELL,START_TIME,STAGE_NAME,TOOLCHAIN_PREFIX,HOST_ARCH"
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20
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21 # Unset any variable we don't recognize. It can screw up the build.
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22
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23 for i in $(env | sed -n 's/=.*//p')
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24 do
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25 is_in_list $i "$TEMP" && continue
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26 [ "${i:0:7}" == "DISTCC_" ] && continue
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27 [ "${i:0:7}" == "CCACHE_" ] && continue
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28
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29 unset $i 2>/dev/null
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30 done
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31 }
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32
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33 # Assign (export) a variable only if current value is blank
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34
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35 export_if_blank()
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36 {
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37 [ -z "$(eval "echo \"\${${1/=*/}}\"")" ] && export "$1"
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38 }
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39
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40 # Create a blank directory at first argument, deleting existing contents if any
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41
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42 blank_tempdir()
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43 {
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44 # sanity test: never rm -rf something we don't own.
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45 [ -z "$1" ] && dienow
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46 touch -c "$1" || dienow
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47
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48 # Delete old directory, create new one.
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49 [ -z "$NO_CLEANUP" ] && rm -rf "$1"
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50 mkdir -p "$1" || dienow
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51 }
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52
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53 # output the sha1sum of a file
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54
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55 sha1file()
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56 {
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57 sha1sum "$@" | awk '{print $1}'
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58 }
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59
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60 # dienow() is an exit function that works properly even from a subshell.
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61 # (actually_dienow is run in the parent shell via signal handler.)
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62
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63 actually_dienow()
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64 {
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65 echo -e "\n\e[31mExiting due to errors ($ARCH_NAME $STAGE_NAME $PACKAGE)\e[0m" >&2
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66 exit 1
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67 }
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68
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69 trap actually_dienow SIGUSR1
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70 TOPSHELL=$$
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71
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72 dienow()
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73 {
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74 kill -USR1 $TOPSHELL
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75 exit 1
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76 }
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77
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78 # Turn a bunch of output lines into a much quieter series of periods,
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79 # roughly one per screenfull
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80
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81 dotprogress()
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82 {
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83 x=0
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84 while read i
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85 do
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86 x=$[$x + 1]
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87 if [[ "$x" -eq 25 ]]
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88 then
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89 x=0
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90 echo -n .
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91 fi
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92 done
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93 echo
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94 }
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95
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96 # Announce an action to the world
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97
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98 announce()
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99 {
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100 # Write a line to the log file with easily greppable header
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101 echo "=== $1 ($ARCH_NAME $STAGE_NAME)"
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102
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103 # Set the title bar of the current xterm
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104 [ -z "$NO_TITLE_BAR" ] && echo -en "\033]2;$ARCH_NAME $STAGE_NAME $1\007"
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105 }
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106
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107 # Filter out unnecessary noise, keeping just lines starting with "==="
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108
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109 maybe_quiet()
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110 {
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111 [ -z "$FORK" ] && cat || grep "^==="
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112 }
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113
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114 # Run a command background if FORK is set, in foreground otherwise
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115
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116 maybe_fork()
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117 {
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118 [ -z "$BUILD_VERBOSE" ] || echo "$*"
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119
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120 if [ -z "$FORK" ]
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121 then
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122 eval "$*"
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123 else
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124 eval "$*" &
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125 fi
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126 }
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127
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128 # Kill a process and all its decendants
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129
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130 killtree()
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131 {
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132 local KIDS=""
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133
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134 while [ $# -ne 0 ]
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135 do
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136 KIDS="$KIDS $(pgrep -P$1)"
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137 shift
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138 done
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139
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140 KIDS="$(echo -n $KIDS)"
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141 if [ ! -z "$KIDS" ]
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142 then
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143 # Depth first kill avoids reparent_to_init hiding stuff.
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144 killtree $KIDS
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145 kill $KIDS 2>/dev/null
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146 fi
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147 }
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148
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149 # Search a colon-separated path for files matching a pattern.
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150
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151 # Arguments are 1) path to search, 2) pattern, 3) command to run on each file.
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152 # During command, $DIR/$FILE points to file found.
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153
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154 path_search()
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155 {
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156 # For each each $PATH element, loop through each file in that directory,
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157 # and create a symlink to the wrapper with that name. In the case of
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158 # duplicates, keep the first one.
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159
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160 echo "$1" | sed 's/:/\n/g' | while read DIR
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161 do
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162 find "$DIR/" -maxdepth 1 -mindepth 1 -name "$2" | sed 's@.*/@@' | \
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163 while read FILE
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164 do
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165 eval "$3"
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166
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167 # Output is verbose. Pipe it to dotprogress.
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168
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169 echo $FILE
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170 done
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171 done
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172 }
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173
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174 # Abort if we haven't got a prerequisite in the $PATH
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175
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176 check_prerequisite()
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177 {
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178 if [ -z "$(which "$1")" ]
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179 then
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180 [ -z "$FAIL_QUIET" ] && echo No "$1" in '$PATH'. >&2
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181 dienow
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182 fi
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183 }
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184
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185 # Search through all the files under a directory and collapse together
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186 # identical files into hardlinks
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187
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188 collapse_hardlinks()
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189 {
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190 SHA1LIST=""
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191 find "$1" -type f | while read FILE
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192 do
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193 echo "$FILE"
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194 SHA1=$(sha1file "$FILE")
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195 MATCH=$(echo "$SHA1LIST" | grep "^$SHA1")
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196 if [ -z "$MATCH" ]
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197 then
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198 # Yes, the quote spanning two lines here is intentional
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199 SHA1LIST="$SHA1LIST
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200 $SHA1 $FILE"
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201 else
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202 FILE2="$(echo "$MATCH" | sed 's/[^ ]* //')"
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203 cmp -s "$FILE" "$FILE2" || continue
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204 ln -f "$FILE" "$FILE2" || dienow
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205 fi
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206 done
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207 }
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208
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209 # Check if $1 is in the comma separated list $2
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210
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211 is_in_list()
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212 {
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213 [ "$2" == all ] || [ ! -z "$(echo ,"$2", | grep ,"$1",)" ]
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214 }