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  70                   <h2 itemprop="name" class="asset-name entry-title">Building Bluecat on RH 8.0</h2>
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  73                       <li class="asset-meta-list-item">Posted on <time datetime="2005-04-04T14:33:32-08:00" itemprop="datePublished">April  4, 2005</time></li>
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  77                       <li class="asset-meta-list-item">in <a itemprop="articleSection" rel="tag" href="http://defaria.com/blogs/Status/lynuxworks/">LynuxWorks</a></li>
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  84                   <ul>
  85   <li>Build local GNUTools on RH 8.0</li>
  86
  87   <li>Fixed bug in do_it script WRT RH 8.0</li>
  88 </ul>
  89                   <h3>Building GNUTools on RH 8.0</h3>
  90
  91 <p>When trying to build Bluecat on RH 8.0 and running mktools (to build the local gnutools) I get the following:</p>
  92
  93 <div class="code"><pre>
  94 [int@europa make]$ autoreconf -f -i
  95 autoreconf: `aclocal.m4' is updated
  96 Makefile.am: installing `./depcomp'
  97 WARNING: Using auxiliary files such as `acconfig.h', `config.h.bot'
  98 WARNING: and `config.h.top', to define templates for `config.h.in'
  99 WARNING: is deprecated and discouraged.
 100
 101 WARNING: Using the third argument of `AC_DEFINE' and
 102 WARNING: `AC_DEFINE_UNQUOTED' allows to define a template without
 103 WARNING: `acconfig.h':
 104
 105 WARNING:   AC_DEFINE([NEED_MAIN], 1,
 106 WARNING:             [Define if a function `main' is needed.])
 107
 108 WARNING: More sophisticated templates can also be produced, see the
 109 WARNING: documentation.
 110 autoheader-2.53: `config.h.in' is updated
 111 </pre></div>
 112
 113 <p>Further, after running configure I get the following odd file in /usr/local/bluecat/eng/bluecat/make/.deps: remote-$(REMOTE).Po which causes the make to fail:</p>
 114
 115 <div class="code"><pre>
 116 [int@europa make]$ make
 117 Makefile:329: .deps/remote-stub.Po: No such file or directory
 118 make: *** No rule to make target `.deps/remote-stub.Po'.  Stop.
 119 </pre></div>
 120
 121 <p>Renaming .deps/remote-$(REMOTE).Po -> .deps/remote-stub.Po allows the make to proceed.</p>
 122
 123 <h3>Fun with eval, echo and new shell</h3>
 124
 125 <p>One of the things that the Bluecat do_it script does is to define the series of "steps" that need to be performed in terms of command lines in variables. Later on the $BUILD_STEP is evaluated to determine which set of commands need to be done as follows:</p>
 126
 127 <div class="code"><pre>
 128 echo "---- Step $BUILD_STEP started at `date` ----"
 129 su $BUILD_CMD_OWNER -c "mkdir -p $LOGS_PREFIX/step${BUILD_STEP}"
 130 cmd=`eval echo $"STEP${BUILD_STEP}_CMD"`
 131 su $BUILD_CMD_OWNER -c "$cmd $*"
 132 </pre></div>
 133
 134 <p>Effectively the name of the environment variable holding the proper command(s) for the step is composed with the echo portion. The eval statement is used to "evaluate" that environment variable thus storing the string of commands into the environment variable cmd. This works well in past versions of the OS but it fails in RH 8.0. First here's the behavior on RH 6.1:</p>
 135
 136 <div class="code"><pre>
 137 <font color="blue"><b>RH6.1:</b></font><u>export STEP1_CMD="ls /tmp"</u>
 138 <font color="blue"><b>RH6.1:</b></font><u>export BUILD_STEP=1</u>
 139 <font color="blue"><b>RH6.1:</b></font><u>echo $"STEP${BUILD_STEP}_CMD"</u>
 140 $STEP1_CMD
 141 </pre></div>
 142
 143 <p>However hears the same commands on RH8.0:</p>
 144
 145 <div class="code"><pre>
 146 <font color="red"><b>RH8.0:</b></font><u>export STEP1_CMD="ls /tmp"</u>
 147 <font color="red"><b>RH8.0:</b></font><u>export BUILD_STEP=1</u>
 148 <font color="red"><b>RH8.0:</b></font><u>echo $"STEP${BUILD_STEP}_CMD"</u>
 149 STEP1_CMD
 150 </pre></div>
 151
 152 <p>As you can see the result is missing a $. Prepending a leading \ before the $ fixes this. Adding in the eval portion also works:</p>
 153
 154 <div class="code"><pre>
 155 <font color="red"><b>RH8.0:</b></font><u>eval echo \$"STEP${BUILD_STEP}_CMD"</u>
 156 ls /tmp
 157 </pre></div>
 158
 159 <p>However when this is assigned to another environment variable (i.e. cmd) the result is not correct:</p>
 160
 161 <div class="code"><pre>
 162 <font color="red"><b>RH8.0:</b></font><u>cmd=`eval echo \$"STEP${BUILD_STEP}_CMD"`</u>
 163 <font color="red"><b>RH8.0:</b></font><u>echo $cmd</u>
 164 STEP1_CMD
 165 </pre></div>
 166
 167 <p>Subsituting the syntax of $(<command>) for `<command` however does work:</p>
 168
 169 <div class="code"><pre>
 170 <font color="red"><b>RH8.0:</b></font><u>cmd=$(eval echo \$"STEP${BUILD_STEP}_CMD")</u>
 171 <font color="red"><b>RH8.0:</b></font><u>echo $cmd</u>
 172 ls /tmp
 173 </pre></div>
 174
 175 <p>Note that the shell (bash) has been majorly updated for RH8.0:</p>
 176
 177 <div class="code"><pre>
 178 <font color="blue"><b>RH6.1:</b></font><u>bash -version</u>
 179 GNU bash, version 1.14.7(1)
 180 </pre></div>
 181
 182 <p>Versus:</p>
 183
 184 <div class="code"><pre>
 185 <font color="red"><b>RH8.0:</b></font><u>bash -version</u>
 186 GNU bash, version 2.05b.0(1)-release (i686-pc-linux-gnu)
 187 Copyright (C) 2002 Free Software Foundation, Inc.
 188 </pre></div>
 189
 190 <p>Please note that this new syntax also works flawlessly on the older RH 6.1.</p>
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