Is it possible to configure svn such that it automatically sets the svn:keywords property after svn-adding a file?
That is, when I add a file to svn, I usually do that with two steps:
svn add someNewFile.foo
svn propset svn:keywords "HeadURL Revision Author Date Id" someNewFile.foo
and I'd like to have the 2nd step automatically done for me by svn.
You should have a look at the svn:auto-props feature. Details can be found here and here.
Note, however, that this is a client-side feature, i.e. it is not done by the server, but by every client. This means, every client has to change its configuration. This downside is also explained in the provided links.
Yes you can use the client configuration of your svn client.
/home/user/.subversion/config
There you find a section with auto-props. That's the area where you can configure that behaviour but ths will work only for added files as you mentioned.