I choose "Update as much as possible with svn revert before checkout" ad checkout strategy, but jenkins delete workspace before checkout, resulting in an error deleting unversioned-file directory
Checking out a fresh workspace because there's no workspace at /var/lib/myshared

In the log (see attachment) you can see the stack trace:

at hudson.Util.deleteRecursive(Util.java:310)
at hudson.Util.deleteContentsRecursive(Util.java:212)
at hudson.scm.subversion.CheckoutUpdater$1.perform(CheckoutUpdater.java:80)
at hudson.scm.subversion.WorkspaceUpdater$UpdateTask.delegateTo(WorkspaceUpdater.java:162)
at hudson.scm.subversion.WorkspaceUpdater$UpdateTask.delegateTo(WorkspaceUpdater.java:170)
at hudson.scm.subversion.UpdateUpdater$TaskImpl.perform(UpdateUpdater.java:133)
at hudson.scm.subversion.WorkspaceUpdater$UpdateTask.delegateTo(WorkspaceUpdater.java:162)
at hudson.scm.SubversionSCM$CheckOutTask.perform(SubversionSCM.java:991)
at hudson.scm.SubversionSCM$CheckOutTask.invoke(SubversionSCM.java:972)
at hudson.scm.SubversionSCM$CheckOutTask.invoke(SubversionSCM.java:948)