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annotate sources/utility_functions.sh @ 1815:191dfad915ba draft

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Fix from Geoff Salmon for hang (sha1sum reading stdin) when new gather_patches function returns nothing for a given package.
author Rob Landley <rob@landley.net>
date Wed, 18 Nov 2015 09:18:44 -0600
parents c654511d227c
children
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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 # Create a blank directory at first argument, deleting existing contents if any
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6
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7 blank_tempdir()
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8 {
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9 # sanity test: never rm -rf something we don't own.
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10 [ -z "$1" ] && dienow
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11 touch -c "$1" || dienow
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12
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13 # Delete old directory, create new one.
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14 [ -z "$NO_CLEANUP" ] && rm -rf "$1"
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15 mkdir -p "$1" || dienow
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16 }
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17
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18 # output the sha1sum of a file
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19
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20 sha1file()
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21 {
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191dfad915ba Fix from Geoff Salmon for hang (sha1sum reading stdin) when new gather_patches function returns nothing for a given package.
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22 sha1sum /dev/null "$@" | tail -n +2 | awk '{print $1}'
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23 }
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24
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25 # dienow() is an exit function that works properly even from a subshell.
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26 # (actually_dienow is run in the parent shell via signal handler.)
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27
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28 actually_dienow()
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29 {
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30 echo -e "\n\e[31mExiting due to errors ($ARCH_NAME $STAGE_NAME $PACKAGE)\e[0m" >&2
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31 exit 1
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32 }
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33
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34 trap actually_dienow SIGUSR1
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35 TOPSHELL=$$
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36
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37 dienow()
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38 {
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39 kill -USR1 $TOPSHELL
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40 exit 1
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41 }
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42
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43 # Turn a bunch of output lines into a much quieter series of periods,
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44 # roughly one per screenfull
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45
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46 dotprogress()
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47 {
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48 x=0
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49 while read i
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50 do
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51 x=$[$x + 1]
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52 if [[ "$x" -eq 25 ]]
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53 then
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54 x=0
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55 echo -n .
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56 fi
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57 done
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58 echo
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59 }
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60
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61 # Announce an action to the world
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62
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63 announce()
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64 {
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65 # Write a line to the log file with easily greppable header
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66 echo "=== $1 ($ARCH_NAME $STAGE_NAME)"
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67
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68 # Set the title bar of the current xterm
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69 [ -z "$NO_TITLE_BAR" ] && echo -en "\033]2;$ARCH_NAME $STAGE_NAME $1\007"
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70 }
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71
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72 # Filter out unnecessary noise, keeping just lines starting with "==="
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73
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74 maybe_quiet()
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75 {
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76 [ -z "$FORK" ] && cat || grep "^==="
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77 }
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78
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79 # Run a command background if FORK is set, in foreground otherwise
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80
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81 maybe_fork()
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82 {
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83 [ -z "$BUILD_VERBOSE" ] || echo "$*"
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84
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85 if [ -z "$FORK" ]
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86 then
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87 eval "$*"
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88 else
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89 eval "$*" &
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90 fi
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91 }
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92
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93 # Kill a process and all its decendants
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94
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95 killtree()
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96 {
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97 local KIDS=""
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98
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99 while [ $# -ne 0 ]
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100 do
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101 KIDS="$KIDS $(pgrep -P$1)"
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102 shift
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103 done
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104
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105 KIDS="$(echo -n $KIDS)"
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106 if [ ! -z "$KIDS" ]
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107 then
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108 # Depth first kill avoids reparent_to_init hiding stuff.
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109 killtree $KIDS
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110 kill $KIDS 2>/dev/null
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111 fi
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112 }
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113
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114 # Search a colon-separated path for files matching a pattern.
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115
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116 # Arguments are 1) path to search, 2) pattern, 3) command to run on each file.
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117 # During command, $DIR/$FILE points to file found.
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118
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119 path_search()
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120 {
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121 # For each each $PATH element, loop through each file in that directory,
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122 # and create a symlink to the wrapper with that name. In the case of
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123 # duplicates, keep the first one.
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124
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125 echo "$1" | sed 's/:/\n/g' | while read DIR
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126 do
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127 find "$DIR/" -maxdepth 1 -mindepth 1 -name "$2" | sed 's@.*/@@' | \
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128 while read FILE
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129 do
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130 eval "$3"
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131
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132 # Output is verbose. Pipe it to dotprogress.
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133
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134 echo $FILE
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135 done
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136 done
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137 }
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138
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139 # Abort if we haven't got a prerequisite in the $PATH
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140
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141 check_prerequisite()
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142 {
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143 if [ -z "$(which "$1")" ]
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144 then
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145 [ -z "$FAIL_QUIET" ] && echo No "$1" in '$PATH'. >&2
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146 dienow
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147 fi
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148 }
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149
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150 # Search through all the files under a directory and collapse together
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151 # identical files into hardlinks
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152
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153 collapse_hardlinks()
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154 {
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155 SHA1LIST=""
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156 find "$1" -type f | while read FILE
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157 do
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158 echo "$FILE"
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159 SHA1=$(sha1file "$FILE")
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160 MATCH=$(echo "$SHA1LIST" | grep "^$SHA1")
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161 if [ -z "$MATCH" ]
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162 then
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163 # Yes, the quote spanning two lines here is intentional
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164 SHA1LIST="$SHA1LIST
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165 $SHA1 $FILE"
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166 else
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167 FILE2="$(echo "$MATCH" | sed 's/[^ ]* //')"
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168 cmp -s "$FILE" "$FILE2" || continue
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169 ln -f "$FILE" "$FILE2" || dienow
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170 fi
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171 done
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172 }
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173
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174 # Check if $1 is in the comma separated list $2
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175
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176 is_in_list()
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177 {
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178 [ "$2" == all ] || [ ! -z "$(echo ,"$2", | grep ,"$1",)" ]
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179 }