HTTPS SSH
       The Community Earth System Model version 1.3 (CESM1.3)

                     http://www2.cesm.ucar.edu

       See the CESM web site for documentation and information.


For commits to the CESM svn repo

1) check out the latest ccsm4 tag but do not populate external directories
> svn co --ignore-externals $SVNREPO/cesm1/tags/cesm1_3_alpha## my_sandbox
> svn co -N $SVNREPO/cesm1/tags/cesm1_3_alpha## my_sandbox

2) modify the file SVN_EXTERNAL_DIRECTORIES with any changes to
component tags
> cd  my_sandbox
> emacs SVN_EXTERNAL_DIRECTORIES

3) set the property for the external definitions - don't forget the dot at the end
> svn propset  svn:externals  -F SVN_EXTERNAL_DIRECTORIES .

4) populate your sandbox with the external files
> svn update

5) test

6) document your mods
> cp  ChangeLog_template  ChangeLog.new
> cat  ChangeLog  >>  ChangeLog.new
> emacs  ChangeLog.new
> mv ChangeLog.new  ChangeLog

7) copy your sandbox to a new tag in the repository
> svn copy . $SVNREPO/ccsm4/tags/cesm1_3_alpha## -m "created tag cesm1_3_alpha##"