Christian Couder wrote:

+------------
+
+* Configure a 'sign' trailer with a command to automatically add a
+  'Signed-off-by: ' with the author information only if there is no
+  'Signed-off-by: ' already, and show how it works:
++
+------------
+$ git config trailer.sign.key "Signed-off-by: "
+$ git config trailer.sign.ifmissing add
+$ git config trailer.sign.ifexists doNothing
+$ git config trailer.sign.command 'echo "$(git config user.name) <$(git config 
user.email)>"'
+$ git interpret-trailers <<EOF
+> EOF

How to configure git-interpret-trailers command so that it follow
current rules for DCO:
* Signed-off-by: is always at bottom; we can have
  signoff+signoff+ack+signoff
* Signed-off-by: can repeat itself with the same author;
  this denotes steps in coming up with current version of the patch.
* but we shouldn't repeat the same signoff one after another

So we want to allow this:

  Signed-off-by: A U Thor <aut...@example.com>
  Signed-off-by: Joe R. Hacker <j...@hacker.com>
  Acked-by: D E Veloper <develo...@example.com>
  Signed-off-by: C O Mitter <commit...@example.com>

but prevent this

  Signed-off-by: C O Mitter <commit...@example.com>
  Signed-off-by: C O Mitter <commit...@example.com>


IIRC
--
Jakub Narębski

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