Drop the Signed-off-by requirement

We've had this for roughly 10y now and it's value is dubious. Most of
xorg no longer requires, mesa accepts but doesn't require it, most of GNOME
doesn't accept it and neither does systemd.

Let's drop the requirement.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

.gitlab-ci.yml

@@ -169,7 +169,7 @@ check-ci-script:
     - exit 1
 
 #
-# Verify that commit messages are as expected, signed-off, etc.
+# Verify that commit messages are as expected, etc.
 #
 
 check-commit:
@@ -177,7 +177,7 @@ check-commit:
     - .fdo.ci-fairy
   stage: sanity check
   script:
-    - ci-fairy -vv check-commits --signed-off-by --junit-xml=results.xml && exit 0 || true
+    - ci-fairy -vv check-commits --junit-xml=results.xml && exit 0 || true
     - >
       printf "%s\n" \
         "Error checking commit format. Please verify" \

.gitlab-ci/ci.template

@@ -157,7 +157,7 @@ check-ci-script:
     - exit 1
 
 #
-# Verify that commit messages are as expected, signed-off, etc.
+# Verify that commit messages are as expected, etc.
 #
 
 check-commit:
@@ -165,7 +165,7 @@ check-commit:
     - .fdo.ci-fairy
   stage: sanity check
   script:
-    - ci-fairy -vv check-commits --signed-off-by --junit-xml=results.xml && exit 0 || true
+    - ci-fairy -vv check-commits --junit-xml=results.xml && exit 0 || true
     - >
       printf "%s\n" \
         "Error checking commit format. Please verify" \

.triage-policies.yml

@@ -33,8 +33,7 @@ resource_rules:
             - "bugbot::commit-rules"
           comment: |
             Hi. Looks like the pipeline failed because one or more of the commits in this MR do not meet our requirements.
-            Most commonly this is a missing Signed-off-by, sometimes its the format of the commit message itself.
+            Most commonly this the format of the commit message itself. The "Test summary" above has the details.
-            The "Test summary" above has the details.
 
             Please see [our docs for commit messages](https://wayland.freedesktop.org/libinput/doc/latest/contributing.html#commit-messages)
             and [our docs for submitting code](https://wayland.freedesktop.org/libinput/doc/latest/contributing.html#submitting-code)

CODING_STYLE.md

@@ -211,38 +211,6 @@ the approach chosen was correct. A good commit message also helps
 maintainers to decide if a given patch is suitable for stable branches or
 inclusion in a distribution.
 
-## Developer Certificate of Origin
-
-Your commit **must** be signed off with a line:
-```
-Signed-off-by: <your name> <your email address>
-```
-By signing off, you indicate the [developer certificate of origin](https://developercertificate.org/).
-
-> By making a contribution to this project, I certify that:
->
-> (a) The contribution was created in whole or in part by me and I
->     have the right to submit it under the open source license
->     indicated in the file; or
->
-> (b) The contribution is based upon previous work that, to the best
->     of my knowledge, is covered under an appropriate open source
->     license and I have the right under that license to submit that
->     work with modifications, whether created in whole or in part
->     by me, under the same open source license (unless I am
->     permitted to submit under a different license), as indicated
->     in the file; or
->
-> (c) The contribution was provided directly to me by some other
->     person who certified (a), (b) or (c) and I have not modified
->     it.
->
-> (d) I understand and agree that this project and the contribution
->     are public and that a record of the contribution (including all
->     personal information I submit with it, including my sign-off) is
->     maintained indefinitely and may be redistributed consistent with
->     this project or the open source license(s) involved.
-
 ## Commit message format
 
 The canonical git commit message format is:
@@ -257,8 +225,6 @@ supported.
 You can include extra data where required like:
 - benchmark one says 10s
 - benchmark two says 12s
-
-Signed-off-by: <your name> <your email>
 ```
 
 The subject line is the first thing everyone sees about this commit, so make
@@ -270,9 +236,8 @@ sure it's on point.
   "change foo to bar", not "changed foo to bar".
 - The text width of the commit should be 78 chars or less, especially the
   subject line.
-- The author and signed-off-by must be the name you usually identify
+- The author must be the name you usually identify as and email address. We do
-  as and email address. We do not accept the default `@users.noreply` gitlab
+  not accept the default `@users.noreply` gitlab addresses.
-  addresses.
   ```
   git config --global user.name Your Name
   git config --global user.email your@email

doc/user/contributing.rst

@@ -266,25 +266,6 @@ same file(s) as the patch being sent.
 Commit Messages
 ------------------------------------------------------------------------------
 
-Commit messages **must** contain a **Signed-off-by** line with your name
-and email address. An example is: ::
-
-    A description of this commit, and it's great work.
-
-    Signed-off-by: Claire Someone <name@domain>
-
-If you're not the patch's original author, you should
-also gather S-o-b's by them (and/or whomever gave the patch to you.) The
-significance of this is that it certifies that you created the patch, that
-it was created under an appropriate open source license, or provided to you
-under those terms. This lets us indicate a chain of responsibility for the
-copyright status of the code. An example is: ::
-
-    A description of this commit, and it's great work.
-
-    Signed-off-by: Claire Someone <name@domain>
-    Signed-off-by: Ferris Crab <name@domain>
-
 When you re-send patches, revised or not, it would be very good to document the
 changes compared to the previous revision in the commit message and/or the
 merge request. If you have already received Reviewed-by or Acked-by tags, you
@@ -353,26 +334,6 @@ step failed.
 
 Follow the appropriate section to fix the errors.
 
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-Missing "Signed-off-by: author information"
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-As explained in :ref:`contributing_commit_messages`, every commit must contain a
-Signed-off-by line with your name and email address.
-
-When this line is not present, it can be added to your commit afterwards: ::
-
-  git commit --amend -s
-
-If the merge request contains more than one commit, it must be added to all of
-them: ::
-
-  git rebase --interactive --exec 'git commit --amend -s' main
-
-Once the problem is fixed, force-push your branch. See
-:ref:`contributing_submitting_code` for more details about how to push your code
-and interactive rebases.
-
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Committed gitlab-ci.yml differs from generated gitlab-ci.yml. Please verify
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~