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 "$(git config <$(git config>"'
+$ 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
* 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 <>
  Signed-off-by: Joe R. Hacker <>
  Acked-by: D E Veloper <>
  Signed-off-by: C O Mitter <>

but prevent this

  Signed-off-by: C O Mitter <>
  Signed-off-by: C O Mitter <>

Jakub Narębski

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