How do I get the CVS plugin working in Eclipse 2021-09?

Question

I have an Eclipse 2021-09 install on a RHEL8 machine without Internet access.

Therefore I have downloaded the CVS jar org.eclipse.cvs_1.4.1900.v20210906-0500.jar on an other machine and then copied it into the dropins directory of my RHEL8 Eclipse install. After this I started the Eclipse IDE and now I can see that CVS plugin in Eclipse's list of plugins.

So far so good. But when I try to import a CVS project (via File > Import) I cannot see an CVS import option. Nowhere else I can see anything about the CVS plugin either.

How do I get the CVS plugin working in Eclipse 2021-09?

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More Details:

Eclipse writes the follwoing messages to stdout/stderr:

org.eclipse.m2e.logback.configuration: The org.eclipse.m2e.logback.configuration bundle was activated before the state location was initialized.  Will retry after the state location is initialized.
org.eclipse.m2e.logback.configuration: Logback config file: /home/halloleo/eclipse-workspace/.metadata/.plugins/org.eclipse.m2e.logback.configuration/logback.1.16.1.20210603-1006.xml
org.eclipse.m2e.logback.configuration: Initializing logback

Answer 1

That plug-in on its own only contains a small part of the CVS code. The CVS feature.xml for 2021-09 contains:

  <plugin
         id="org.eclipse.cvs"
         download-size="30"
         install-size="40"
         version="1.4.1900.v20210906-0500"
         unpack="false"/>

   <plugin
         id="org.eclipse.team.cvs.core"
         download-size="577"
         install-size="1343"
         version="3.5.0.v20210511-0556"
         unpack="false"/>

   <plugin
         id="org.eclipse.team.cvs.ssh2"
         download-size="30"
         install-size="57"
         version="3.4.0.v20210426-0837"
         unpack="false"/>

   <plugin
         id="org.eclipse.team.cvs.ui"
         download-size="1527"
         install-size="3495"
         version="3.5.0.v20210426-0843"
         unpack="false"/>

So you need all those plug-ins.