defaria.com/blogs/Status/2005/12/get-views-for-s.html

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  70                   <h2 itemprop="name" class="asset-name entry-title">get_views_for_stream/create_dev_snapview.pl</h2>
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  73                       <li class="asset-meta-list-item">Posted on <time datetime="2005-12-14T13:48:32-08:00" itemprop="datePublished">December 14, 2005</time></li>
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  84                   <ul>
  85   <li>Found and fixed bug in get_views_for_stream</li>
  86
  87   <li>Fixed bug in create_dev_snapview.pl::ParseBaselines
  88 </ul>
  89                   <h2>get_views_for_stream</h2>
  90
  91 <p>Hi Naga. I'm writing you this because I believe there's a bug, possibly with Clearcase, but that seems to manifest itself in code I believe you wrote. I came across this implementing enhancements to create_dev_snapview.pl for Andrew Feltham. In essence Andrew wants to be able to have multiple views in a stream. I've implemented a -reuse_stream parm to allow this. If -reuse_stream is used then the code will skip recreating the stream and effectively just make another view in that same stream. If -reuse_stream is not specified then the stream is removed - along with any views that that stream has.</p>
  92
  93 <p>It appears as if the code was coded to attempt to handle the case where a stream has multiple views however it fails due to a possible but with lsstream. When calling create_stream the code checks to see if the stream exists and if it does it attempts to recreate the stream by determining the view(s) in the stream, deleting them, deleting the stream and creating the stream anew.</p>
  94
  95 <p>To determine the view(s) in the stream get_views_for_stream is called. Here's the original function:</p>
  96
  97 <div class="code"><pre>
  98 sub get_views_for_stream {
  99     my $sel_pvob = $_[0];
 100     my $sel_stream = $_[1];
 101
 102     my @views = split(/\n/, `cleartool lsstream -fmt \"\%\[views\]p\\n\" stream:$sel_stream\@\\$sel_pvob`);
 103     return @views;
 104 }
 105 </pre></div>
 106
 107 <p>Essentially it does an lsstream asking for only the views, separated by newlines. The problem is that lsstream (with that format) does not return the views separated by newlines:</p>
 108
 109 <div class="code"><pre>
 110 P:\>cleartool lsstream -fmt "%[views]p\n" stream:Build_rmnaNT_adefaria_LTSJCA-ADEFARIA_sv_ldx_2.3@\rmna_projects
 111 adefaria_test adefaria_test2 adefaria_test3
 112
 113 P:\>
 114 </pre></div>
 115
 116 <p>As you can see adefaria_test, adefaria_test2 and adefaria_test3 all appear on the same line. The code then splits the line on \n and effectively always returns a 1 entry array with possibly multiple view names in the first entry separated by spaces. Needless to say this will fail later on when remove_view is called and it generates a "cleartool rmview -force &lt;view names&gt;".</p>
 117
 118 <p>Here's my proposed fix:</p>
 119
 120 <div class="code"><pre>
 121 sub get_views_for_stream {
 122     my $sel_pvob = $_[0];
 123     my $sel_stream = $_[1];
 124     # Modified Wed Dec 14 11:25:09 PST 2005 Andrew@DeFaria.com
 125     #
 126     # Note: The format -fmt "%[views]p\n" below does not work! What is
 127     # expected to be returned is:
 128     #
 129     # view1
 130     # view2
 131     # view3
 132     #
 133     # However what is actually returned is:
 134     #
 135     # view1 view2 view3
 136     #
 137     # Therefore the old spilt of /\n/ always returned a single entry
 138     # array with possibly multiple view names in the first
 139     # entry. Changed to use / / for split and not append a \n.
 140     my @views = split(/ /, `cleartool lsstream -fmt \"\%\[views\]p\" stream:$sel_stream\@\\$sel_pvob`);
 141     return @views;
 142 }
 143 </pre></div>
 144
 145 <p>Is this acceptable to you?</p>
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