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Hi Andy,

The version check is done properly for the XrdClProxyPlugin:

When the plugin version doesn't match it is rejected:

[simonm@idefix XrdCl]$ strings -a $XRD_PLUGIN | grep "@V"
@V:XrdClGetPlugIn v3.9.9
[simonm@idefix XrdCl]$ strings -a libXrdCl.so | grep "@V"
@V:client v4.9.9
[simonm@idefix XrdCl]$ ./xrdcp -f -d 1 root://esvm000//tmp/file1.dat /tmp/dump
[2017-03-28 15:14:19.234129 +0200][Debug ][Utility ] Unable to process user config file: [ERROR] OS Error: No such file or directory
[2017-03-28 15:14:19.234302 +0200][Info ][Utility ] Env: Importing from shell XRD_PLUGIN=/home/simonm/test/xrootd-3.9.9/build/src/libXrdClProxyPlugin.so as PlugIn
[2017-03-28 15:14:19.234335 +0200][Debug ][PlugInMgr ] Initializing plug-in manager...
[2017-03-28 15:14:19.234387 +0200][Debug ][PlugInMgr ] Loading default plug-in from /home/simonm/test/xrootd-3.9.9/build/src/libXrdClProxyPlugin.so...
[2017-03-28 15:14:19.234611 +0200][Debug ][PlugInMgr ] Error while loading /home/simonm/test/xrootd-3.9.9/build/src/libXrdClProxyPlugin.so: Unable to load client plugin /home/simonm/test/xrootd-3.9.9/build/src/libXrdClProxyPlugin.so
[2017-03-28 15:14:19.234625 +0200][Debug ][PlugInMgr ] Failed to load default plug-in from /home/simonm/test/xrootd-3.9.9/build/src/libXrdClProxyPlugin.so
[3.015kB/3.015kB][100%][==================================================][3.015kB/s]

If the plugin version does match it is loaded:

[simonm@idefix XrdCl]$ strings -a $XRD_PLUGIN | grep "@V"
@V:XrdClGetPlugIn v4.9.9
[simonm@idefix XrdCl]$ strings -a libXrdCl.so | grep "@V"
@V:client v4.9.9
[simonm@idefix XrdCl]$ ./xrdcp -f -d 1 root://esvm000//tmp/file1.dat /tmp/dump
[2017-03-28 15:15:05.885847 +0200][Debug ][Utility ] Unable to process user config file: [ERROR] OS Error: No such file or directory
[2017-03-28 15:15:05.885951 +0200][Info ][Utility ] Env: Importing from shell XRD_PLUGIN=/home/simonm/test/xrootd-4.9.9/build/src/libXrdClProxyPlugin.so as PlugIn
[2017-03-28 15:15:05.885971 +0200][Debug ][PlugInMgr ] Initializing plug-in manager...
[2017-03-28 15:15:05.885992 +0200][Debug ][PlugInMgr ] Loading default plug-in from /home/simonm/test/xrootd-4.9.9/build/src/libXrdClProxyPlugin.so...
[3.015kB/3.015kB][100%][==================================================][3.015kB/s]

To be honest the XrdClProxyPlugin is the first plugin that will be included with xrootd core, so there is no convention yet. Hence, it's up to you whether we should follow the "-4" naming convention, or not ;-)

Cheers,
Michal

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