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  73                       <li class="asset-meta-list-item">Posted on <time datetime="2008-02-20T14:49:49-08:00" itemprop="datePublished">February 20, 2008</time></li>
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  84                   <h2>For immediate release...</h2>
  85
  86 <p>Recently Gantry mentioned the following problem:</p>
  87
  88 <blockquote type=cite>
  89   <p>Error Prone Deliveries:</p>
  90
  91   <p>Another problem is that Reinaldo's private files have to be merged
  92 manually.</p>
  93
  94   <p>Ross, Andrew, and I are in a similar situation now where we have to
  95 take a snapshot of directories in a view over to seast1 in order to do
  96 development, then remember what we changed and copy them back in and
  97 deliver.</p>
  98
  99   <p>We have already made several mistakes. </p>
 100 </blockquote>
 101
 102 <p>The problem here is that we have two different Clearcase registry
 103 regions and subnets, code is developed in one region and run in the
 104 other. Gantry proposed a solution of writing more script to maintain
 105 that will essentially copy things between systems. I would like to
 106 propose an alternative...</p>
 107
 108 <h2>Release process</h2>
 109
 110 <p>What if we instead had a release process such that we deliver our
 111 development to the feature stream that is then automatically seen over
 112 on the cclinux region? Code is developed through the WOR process on the
 113 RAN and delivered to the feature stream. This stream has an official
 114 view which is exported to the cclinux region where it is mounted
 115 directly into place<a href="#note_1"><sup>1</sup></a>. Since all
 116 processes that utilize these scripts do so through this base they are
 117 all automatically and immediately updated when the view is updated.
 118 Additionally code is developed cognizant of this base such that an
 119 alternate base can easily be set allowing one to test the release
 120 before making it official.</p>
 121
 122 <h2>Solution proposed</h2>
 123
 124 <h3>Exporting a view</h3>
 125
 126 <p>Clearcase has the ability to export a view/vob path from a view
 127 server to any other machine. This allows you to "access Clearcase from
 128 a machine which does not have Clearcase" (see ct man export_mvfs). In
 129 order to do this a systems administrator adds a line to
 130 /etc/exports.mvfs on the view server where the view resides using the
 131 format of:</p>
 132
 133 <div class=code><pre>
 134 /view/&lt;<i>view_name</i>&gt;/vobs/&lt;<i>vobpath</i>&gt;&lt;<i>netgroup or machine</i>&gt;
 135 </pre></div>
 136
 137 <p>And executes the /opt/rational/clearcase/etc/export_mvfs -a
 138 command.  Additionally &lt;<i>view_name</i>&gt; should be started<a
 139 href="#note_2"><sup>2</sup></a>.</p>
 140
 141 <h3>Official view</h3>
 142
 143 <p>Additionally, as noted above, a view must be utilized. I suggest using
 144 what I like to call <i>official views</i> for this. An <i>official
 145 view</i> is merely a view not associated with any particular person
 146 (e.g. maybe ccadm) that serves in an official capacity. This view
 147 usually has a simple config spec such as the following:</p>
 148
 149 <div class=code><pre>
 150 element * REL_1.0 -nocheckout
 151 </pre></div>
 152
 153 <p>thereby limiting what was seen through the view as only that which is
 154 labeled with REL_1.0. The release process therefore consisted of
 155 applying the REL_1.0 label and poof! Automatically and immediately the
 156 new version was available. Updating to say a REL_1.1 release would
 157 involve then simply a ct setcs and a changing of REL_1.0 to REL_1.1.</p>
 158
 159 <p>For UCM based views, translate the above to applicable baselines...</p>
 160
 161 <h3>Importing the view</h3>
 162
 163 <p>On the client machine, importing the view is simply a mount
 164 command.  The suggestion here is to mount directly to our base,
 165 /usr/local/east:</p>
 166
 167 <div class=code><pre>
 168 $ mount view1:/views/&lt;<i>official view</i>&gt;/vobs/rantest /usr/local/east
 169 </pre></div>
 170
 171 <p>(Actually this should be added to /etc/fstab for automatic, at boot
 172 time, mounting).</p>
 173
 174 <h3>Security and visibility</h3>
 175
 176 <p>There is concern regarding exposing too much visibility of vob
 177 elements in the cclinux region. Since /etc/exports.mvfs allows us to
 178 specify an exacting path of what is exported we can insure that we are
 179 only exporting the .../vobs/rantest portion or even a subdirectory(s)
 180 under rantest. This should sufficiently limit the scope of what's
 181 exposed.</p>
 182
 183 <h2>Notes</h2>
 184
 185 <ol>
 186   <li><small><a name="note_1"></a>This assumes that we adopt a concept
 187 of a base variable from which everything emanates (e.g. /usr/local/east)</small></li>
 188   <li><small><a name="note_2"></a>At HP I devised a simply script
 189 solution to insure that views listed in /etc/views_to_start would be
 190 started at boot up on the view servers.</small></li>
 191 </ol>
 192
 193 <p>Comments? Concerns?</p>
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