Mercurial > cpython-lru_cache-weakref

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Add use_weakref option to functools.lru_cache The use_weakref option makes lru_cache create weak references to the function arguments when creating the cache key, which prevents them from staying in the memory forever even after all other references to them are gone. This is a proof of concept for http://bugs.python.org/issue19859
author Radomir Dopieralski <devel@sheep.art.pl>
date Tue, 03 Dec 2013 16:02:48 +0100
parents 1f334198e6d7
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #!/bin/sh
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2 #
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3 # install - install a program, script, or datafile
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4 #
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5 # This originates from X11R5 (mit/util/scripts/install.sh), which was
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6 # later released in X11R6 (xc/config/util/install.sh) with the
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7 # following copyright and license.
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8 #
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9 # Copyright (C) 1994 X Consortium
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10 #
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11 # Permission is hereby granted, free of charge, to any person obtaining a copy
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12 # of this software and associated documentation files (the "Software"), to
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13 # deal in the Software without restriction, including without limitation the
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14 # rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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15 # sell copies of the Software, and to permit persons to whom the Software is
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16 # furnished to do so, subject to the following conditions:
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17 #
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18 # The above copyright notice and this permission notice shall be included in
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19 # all copies or substantial portions of the Software.
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20 #
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21 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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22 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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23 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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24 # X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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25 # AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNEC-
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26 # TION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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27 #
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28 # Except as contained in this notice, the name of the X Consortium shall not
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29 # be used in advertising or otherwise to promote the sale, use or other deal-
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30 # ings in this Software without prior written authorization from the X Consor-
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31 # tium.
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32 #
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33 #
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34 # FSF changes to this file are in the public domain.
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35 #
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36 # Calling this script install-sh is preferred over install.sh, to prevent
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37 # `make' implicit rules from creating a file called install from it
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38 # when there is no Makefile.
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39 #
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40 # This script is compatible with the BSD install script, but was written
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41 # from scratch. It can only install one file at a time, a restriction
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42 # shared with many OS's install programs.
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43
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44
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45 # set DOITPROG to echo to test this script
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46
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47 # Don't use :- since 4.3BSD and earlier shells don't like it.
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48 doit="${DOITPROG-}"
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49
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50
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51 # put in absolute paths if you don't have them in your path; or use env. vars.
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52
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53 mvprog="${MVPROG-mv}"
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54 cpprog="${CPPROG-cp}"
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55 chmodprog="${CHMODPROG-chmod}"
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56 chownprog="${CHOWNPROG-chown}"
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57 chgrpprog="${CHGRPPROG-chgrp}"
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58 stripprog="${STRIPPROG-strip}"
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59 rmprog="${RMPROG-rm}"
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60 mkdirprog="${MKDIRPROG-mkdir}"
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61
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62 transformbasename=""
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63 transform_arg=""
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64 instcmd="$mvprog"
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65 chmodcmd="$chmodprog 0755"
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66 chowncmd=""
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67 chgrpcmd=""
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68 stripcmd=""
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69 rmcmd="$rmprog -f"
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70 mvcmd="$mvprog"
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71 src=""
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72 dst=""
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73 dir_arg=""
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74
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75 while [ x"$1" != x ]; do
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76 case $1 in
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77 -c) instcmd=$cpprog
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78 shift
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79 continue;;
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80
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81 -d) dir_arg=true
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82 shift
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83 continue;;
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84
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85 -m) chmodcmd="$chmodprog $2"
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86 shift
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87 shift
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88 continue;;
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89
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90 -o) chowncmd="$chownprog $2"
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91 shift
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92 shift
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93 continue;;
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94
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95 -g) chgrpcmd="$chgrpprog $2"
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96 shift
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97 shift
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98 continue;;
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99
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100 -s) stripcmd=$stripprog
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101 shift
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102 continue;;
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103
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104 -t=*) transformarg=`echo $1 | sed 's/-t=//'`
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105 shift
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106 continue;;
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107
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108 -b=*) transformbasename=`echo $1 | sed 's/-b=//'`
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109 shift
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110 continue;;
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111
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112 *) if [ x"$src" = x ]
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113 then
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114 src=$1
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115 else
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116 # this colon is to work around a 386BSD /bin/sh bug
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117 :
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118 dst=$1
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119 fi
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120 shift
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121 continue;;
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122 esac
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123 done
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124
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125 if [ x"$src" = x ]
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126 then
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127 echo "$0: no input file specified" >&2
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128 exit 1
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129 else
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130 :
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131 fi
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132
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133 if [ x"$dir_arg" != x ]; then
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134 dst=$src
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135 src=""
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136
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137 if [ -d "$dst" ]; then
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138 instcmd=:
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139 chmodcmd=""
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140 else
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141 instcmd=$mkdirprog
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142 fi
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143 else
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144
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145 # Waiting for this to be detected by the "$instcmd $src $dsttmp" command
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146 # might cause directories to be created, which would be especially bad
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147 # if $src (and thus $dsttmp) contains '*'.
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148
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149 if [ -f "$src" ] || [ -d "$src" ]
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150 then
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151 :
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152 else
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153 echo "$0: $src does not exist" >&2
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154 exit 1
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155 fi
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156
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157 if [ x"$dst" = x ]
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158 then
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159 echo "$0: no destination specified" >&2
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160 exit 1
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161 else
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162 :
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163 fi
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164
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165 # If destination is a directory, append the input filename; if your system
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166 # does not like double slashes in filenames, you may need to add some logic
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167
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168 if [ -d "$dst" ]
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169 then
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170 dst=$dst/`basename "$src"`
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171 else
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172 :
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173 fi
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174 fi
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175
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176 ## this sed command emulates the dirname command
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177 dstdir=`echo "$dst" | sed -e 's,[^/]*$,,;s,/$,,;s,^$,.,'`
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178
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179 # Make sure that the destination directory exists.
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180 # this part is taken from Noah Friedman's mkinstalldirs script
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181
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182 # Skip lots of stat calls in the usual case.
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183 if [ ! -d "$dstdir" ]; then
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184 defaultIFS='
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185 '
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186 IFS="${IFS-$defaultIFS}"
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187
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188 oIFS=$IFS
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189 # Some sh's can't handle IFS=/ for some reason.
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190 IFS='%'
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191 set - `echo "$dstdir" | sed -e 's@/@%@g' -e 's@^%@/@'`
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192 IFS=$oIFS
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193
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194 pathcomp=''
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195
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196 while [ $# -ne 0 ] ; do
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197 pathcomp=$pathcomp$1
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198 shift
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199
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200 if [ ! -d "$pathcomp" ] ;
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201 then
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202 $mkdirprog "$pathcomp"
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203 else
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204 :
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205 fi
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206
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207 pathcomp=$pathcomp/
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208 done
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209 fi
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210
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211 if [ x"$dir_arg" != x ]
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212 then
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213 $doit $instcmd "$dst" &&
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214
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215 if [ x"$chowncmd" != x ]; then $doit $chowncmd "$dst"; else : ; fi &&
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216 if [ x"$chgrpcmd" != x ]; then $doit $chgrpcmd "$dst"; else : ; fi &&
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217 if [ x"$stripcmd" != x ]; then $doit $stripcmd "$dst"; else : ; fi &&
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218 if [ x"$chmodcmd" != x ]; then $doit $chmodcmd "$dst"; else : ; fi
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219 else
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220
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221 # If we're going to rename the final executable, determine the name now.
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222
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223 if [ x"$transformarg" = x ]
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224 then
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225 dstfile=`basename "$dst"`
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226 else
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227 dstfile=`basename "$dst" $transformbasename |
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228 sed $transformarg`$transformbasename
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229 fi
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230
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231 # don't allow the sed command to completely eliminate the filename
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232
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233 if [ x"$dstfile" = x ]
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234 then
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235 dstfile=`basename "$dst"`
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236 else
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237 :
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238 fi
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239
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240 # Make a couple of temp file names in the proper directory.
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241
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242 dsttmp=$dstdir/#inst.$$#
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243 rmtmp=$dstdir/#rm.$$#
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244
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245 # Trap to clean up temp files at exit.
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246
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247 trap 'status=$?; rm -f "$dsttmp" "$rmtmp" && exit $status' 0
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248 trap '(exit $?); exit' 1 2 13 15
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249
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250 # Move or copy the file name to the temp name
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251
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252 $doit $instcmd "$src" "$dsttmp" &&
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253
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254 # and set any options; do chmod last to preserve setuid bits
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255
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256 # If any of these fail, we abort the whole thing. If we want to
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257 # ignore errors from any of these, just make sure not to ignore
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258 # errors from the above "$doit $instcmd $src $dsttmp" command.
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259
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260 if [ x"$chowncmd" != x ]; then $doit $chowncmd "$dsttmp"; else :;fi &&
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261 if [ x"$chgrpcmd" != x ]; then $doit $chgrpcmd "$dsttmp"; else :;fi &&
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262 if [ x"$stripcmd" != x ]; then $doit $stripcmd "$dsttmp"; else :;fi &&
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263 if [ x"$chmodcmd" != x ]; then $doit $chmodcmd "$dsttmp"; else :;fi &&
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264
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265 # Now remove or move aside any old file at destination location. We try this
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266 # two ways since rm can't unlink itself on some systems and the destination
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267 # file might be busy for other reasons. In this case, the final cleanup
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268 # might fail but the new file should still install successfully.
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269
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270 {
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271 if [ -f "$dstdir/$dstfile" ]
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272 then
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273 $doit $rmcmd -f "$dstdir/$dstfile" 2>/dev/null ||
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274 $doit $mvcmd -f "$dstdir/$dstfile" "$rmtmp" 2>/dev/null ||
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275 {
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276 echo "$0: cannot unlink or rename $dstdir/$dstfile" >&2
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277 (exit 1); exit
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278 }
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279 else
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280 :
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281 fi
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282 } &&
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283
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284 # Now rename the file to the real destination.
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285
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286 $doit $mvcmd "$dsttmp" "$dstdir/$dstfile"
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287
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288 fi &&
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289
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290 # The final little trick to "correctly" pass the exit status to the exit trap.
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291
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292 {
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293 (exit 0); exit
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294 }