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/usr/lib/apt-cacher-ng/report.html is in apt-cacher-ng 3.1-1build1.

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<!DOCTYPE html>
<html lang="en">
   <head>
      <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
      <meta http-equiv="X-UA-Compatible" content="IE=8">
      <meta name="MSSmartTagsPreventParsing" content="true">
      <title>Apt-Cacher NG Command And Control Page</title>
      <link rel="stylesheet" type="text/css" href="/style.css">
   </head>
   <body>
      <div align="center">
         <div class="title maxwid"><span>Apt-Cacher NG maintenance page for ${hostname}</span></div>
         <a name="stats"></a>
      <div class="visarea maxwid" style="text-align:left">
         <h2>Transfer statistics</h2>
         <table border=0 cellpadding=2 cellspacing=1 bgcolor="black">
                 <tr>
                         <td class="coltitle"> </td>
                         <td class="coltitle">Since startup</td>
                         <td class="coltitle">Recent history</td>
                 </tr>
                 <tr>
                         <td class="coltitle" style="text-align:left">Data fetched:</td>
                         <td class="colcont" style="text-align:left"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAIAAACQd1PeAAAACXBIWXMAAAsTAAALEwEAmpwYAAAA
                         B3RJTUUH4AoKFBQ7exd8OgAAAAxJREFUCNdjUDC/DwABsQE3XXYqIQAAAABJRU5ErkJggg==" width=${dataIn} height=11> ${dataInHuman}</td>
                         <td class="colcont" style="text-align:left"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAIAAACQd1PeAAAACXBIWXMAAAsTAAALEwEAmpwYAAAA
                         B3RJTUUH4AoKFBQ7exd8OgAAAAxJREFUCNdjUDC/DwABsQE3XXYqIQAAAABJRU5ErkJggg==" width=${dataHistIn} height=11> ${dataHistInHuman}</td>
                 </tr>
                 <tr>
                         <td class="coltitle" style="text-align:left">Data served:</td>
                         <td class="colcont" style="text-align:left"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAIAAACQd1PeAAAACXBIWXMAAAsTAAALEwEAmpwYAAAA
B3RJTUUH4AoKFBIl10Lm3wAAAB1pVFh0Q29tbWVudAAAAAAAQ3JlYXRlZCB3aXRoIEdJTVBkLmUH
AAAADElEQVQI12MQVSgBAAD3AKpQhOaUAAAAAElFTkSuQmCC" width=${dataOut} height=11> ${dataOutHuman}</td>
                         <td class="colcont" style="text-align:left"><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAIAAACQd1PeAAAACXBIWXMAAAsTAAALEwEAmpwYAAAA
B3RJTUUH4AoKFBIl10Lm3wAAAB1pVFh0Q29tbWVudAAAAAAAQ3JlYXRlZCB3aXRoIEdJTVBkLmUH
AAAADElEQVQI12MQVSgBAAD3AKpQhOaUAAAAAElFTkSuQmCC" width=${dataHistOut} height=11> ${dataHistOutHuman}</td>
                 </tr>
         </table>
         <h3>Log analysis</h3>
         <table border=0 cellpadding=2 cellspacing=1 bgcolor="black">
            <tr>
               <td class="coltitle" rowspan=3>Period</td>
               <td class="coltitle" colspan=8>Cache efficiency</td>
            </tr>
            <tr>
               <td class="coltitle"><span>&nbsp;</span></td>
               <td class="coltitle" colspan=3>Requests</td>
               <td class="coltitle"><span>&nbsp;</span></td>
               <td class="coltitle" colspan=3>Data</td>
            </tr>
            <tr bgcolor="white">
               <td class="coltitle"><span>&nbsp;</span></td>
               <td class="coltitle">Hits</td>
               <td class="coltitle">Misses</td>
               <td class="coltitle">Total</td>
               <td class="coltitle"><span>&nbsp;</span></td>
               <td class="coltitle">Hits</td>
               <td class="coltitle">Misses</td>
               <td class="coltitle">Total</td>
            
            </tr>
            ${statsRow}
         </table>
         <br>
         Note: data table is created based on the current log file. Deviation from real request count is possible due to previous log file optimization.
         <h2>Configuration instructions</h2>
         Please visit any invalid download URL to see <a href="/">configuration
            instructions</a> for users. For system administrators, read the <a
            href="/acng-doc/html/index.html">manual</a> (or see system
         documentation <a
            href="http://${serverip}/doc/apt-cacher-ng/html/index.html">online</a>
         resp. in the <a
            href="file:///usr/share/doc/apt-cacher-ng/html/index.html">local
            filesystem</a>).

         <form action="#bottom">

         <h2>Shared processing options</h2>
         Temporary options for the general behavour and index update
         configuration can set in this user interface. They are only relevant
         to expiration and import features triggered below.
         <br />
         <label><input type="checkbox" name="abortOnErrors" value="aOe" ${aOeDefaultChecked}> Stop the work on errors during index update step</label>
               <br>
         <label>      <input type="checkbox" name="beVerbose" value="bV"> More verbosity</label>
               <br>
               <label><input type="checkbox" name="forceRedownload" value="fRd"> Force the download of index files (even having fresh ones)</label>
               <br>
               <!--input type="checkbox" name="jsMode" value="js" checked> Auto-scrolling (requires JavaScript)
               <br-->
            <label><input type="checkbox" name="skipIxUp" value="si"> Don't update index files (DANGEROUS for expiration tasks!)</label>

         <h2>Expiration</h2>
         <p>
         Expiration mechanism is needed to delete files from the local cache when
         they are removed on the servers, e.g. when the software versions of the
         package is updated and the package files are replaced. This is rarely
         needed when Stable system distribution is used by the clients, but use of
         unstable branches with high fluctuation requires to clean up the local
         cache from time to time. ACNG includes helper code to identify
         unreferenced files automatically and optionally check the cache and
         verify data against file information in the index files, where
         available.
         </p>
            <p>
            <h3>Scan and semi-automatic expiration</h3>
            The default method does update the index files, check the
            files present in the cache and optionally delete them. The
            checks consist of file name comparison and optionally file
            contents verification or directory location comparison.
            Files that are not listed in any index file or have
            incorrect contents are marked for removal in one of the
            later sessions, or can be removed by direct user action
            triggered with the controls below.
            <p></p>
            <!--/td>
         </tr>
         <tr>
            <td valign=top-->
               <label><input type="checkbox" name="ignoreTradeOff" value="iTO"> Ignore the threshold that aborts early when there is probably not much to do</label>
               <br>
               <label><input type="checkbox" name="skipHeadChecks" value="sHC"> Skip header checks (faster, not detecting bad metadata)</label>
               <br>
               <label><input type="checkbox" name="byPath" value="bP" id="idBP" onChange="endis();"> <i>Validate by file name AND file directory (use with care),</i></label>
               <br>
               <label><input type="checkbox" name="byChecksum" value="bS" id="idBS" onChange="endis();">
                  <i>then validate file contents through checksum (<font color=red>SLOW</font>), also detecting corrupt files,</i>
               </label>
               <br>
               <label><input type="checkbox" name="truncNow" value="tN" id="idTN"> <i>then truncate damaged files immediately.</i></label>
               <br>
               <label><input type="checkbox" name="incomAsDamaged" value="iad" id="idIAD"> <i>Treat incomplete files as damaged.</i></label>
               <br>
               <label><input type="checkbox" name="purgeNow" value="pN"> Purge unreferenced files immediately after scan</label>
               <br>
               <script type="text/javascript">
document.getElementById("idBS").disabled="disabled";
document.getElementById("idTN").disabled="disabled";
document.getElementById("idIAD").disabled="disabled";
document.getElementById("idBS").checked=false;
document.getElementById("idTN").checked=false;
document.getElementById("idIAD").checked=false;
function endis()
{
   endisCb('idBP', 'idBS');
   endisCb('idBS', 'idTN');
   endisCb('idBS', 'idIAD');
}
function endisCb(idCon, idWhat)
{
   var pCon=document.getElementById(idCon);
   var pWhat=document.getElementById(idWhat);
   if(pCon.checked)
      pWhat.disabled="";
   else
   {
      pWhat.checked=false;
      pWhat.disabled="disabled";
   }
   // pWhat.onchange(); // no longer works with Firefox/IE :-( Using the alternative method too...
   /*var fireOnThis = document.getElementById('idWhat');
   var evObj = document.createEvent('HTMLEvents');
   evObj.initEvent( 'change', true, true );
   fireOnThis.dispatchEvent(evObj);
   */
}
</script>
               <br>
               <input type="submit" name="doExpire" value="Start Scan and/or Expiration">

               <h3>Direct actions</h3>
               <input type="submit" name="justShow" value="Show unreferenced">
               <input type="submit" name="justRemove" value="Delete unreferenced">
               <input type="submit" name="justShowDamaged" value="Show damaged">
               <input type="submit" name="justRemoveDamaged" value="Delete damaged">
               <input type="submit" name="justTruncDamaged" value="Truncate damaged">
            <h2>Import</h2>
            <p>
            Importing package files from foreign sources works in following case:
	    <p>
            Files can be assigned to <b>known</b> download locations. The
            locations become known when they are found in index files. However,
            this index files must exist in the package cache, therefore at least
            one client needs to download them, i.e. running "<b>apt-get update</b>" on a client system
            which is configured for use with ACNG. See ACNG manual for more details.
            <p>
            <!--
            </li>
         </ul>
         -->
         When all conditions are met <!--for one of the described ways,--> put your files into
         the "_import" directory, e.g. <i>/var/cache/apt-cacher-ng/_import/</i>.
         Subdirectories and symlinks are ok. Then run import.       </p>
            <p>
            <input type="submit" name="doImport" value="Start Import">
            </p>
            <h2>Guided precaching (Mirroring)</h2>
            <p>
            Apt-Cacher NG supports a massive download of package files
            referenced in a specified set of index files. This is configured
            with the <i>PrecacheFor</i> configuration option (see config
            examples and manual for details).
            <p>
            In special cases this feature can be used to create a local
            partial mirror where the cache internal structure of packages
            mostly represents the contents of the remote package archive and
            includes everything apt might want to download.
            <p>
            <label><input type="checkbox" name="calcSize" value="cs" checked="checked"> Calculate and display download size</label>
            <br>
            <label><input type="checkbox" name="doDownload" value="dd"> Download package files</label>
            <br>
            <label><input type="checkbox" name="asNeeded" value="an" checked="checked"> Restrict to packages related to previously cached files</label>
            <br>
            <label><input type="checkbox" name="useDebDelta" value="ud"> Use Debdelta if possible (experimental)</label>
            <p>
            <input type="submit" name="doMirror" value="Start Mirroring">
            </p>

         </form>

            <h2>File Type Pattern Tracing</h2>
            <p>
            This section provides a simple tool useful to identify new file name patterns which might be needed to configuration in order to handle new file types correctly. Please provide your findings to apt-cacher-ng author if they might be useful for other users.
            <a name="trace"></a>
            Current value of pattern extensions:
            <br>
            <pre>SPfilePatternEx: ${cfg:SPfilePatternEx}
VfilePatternEx: ${cfg:VfilePatternEx}
PfilePatternEx: ${cfg:PfilePatternEx}</pre>
	    <form action="#trace" method="get">
               <span style="white-space:nowrap;">
                  Current mode:
                  <font style="display:${:/cfg:patrace/inline/none};white-space:nowrap;">
                     <font style="color:red;font-weight:bold;white-space:nowrap;">Active</font>
                     (watching download activity)
                  </font>
                  <font style="display:${:/cfg:patrace/none/inline};white-space:nowrap;">not tracing
                  </font>
               </span>
               <span>
		    <input type="submit" name="doTraceStart" value="Start Tracing" ${:/cfg:patrace/disabled/}>
                    <input type="submit" name="doTraceStop" value="Stop Tracing" ${:/cfg:patrace//disabled}>
                    <input type="submit" name="doTraceClear" value="Clear Trace Data">
                 </span>
                    <p>Currently collected file paths not covered by the configured patterns:
                    <input type="submit" name="doTraceRefresh${random}" value="Refresh">
                    <pre><br>${curPatTraceCol}</pre>
	    </form>
</tr>
         ${footer}
      </div>
   </div>
   </body>
</html>