On Thu, May 27 2021, Kyle Meyer wrote:

> This series updates b4 to the latest version.  b4 now uses a separate tool for
> patch attestation (added in patch 2), which in turn uses a license that's not
> in guix/licenses.scm (added in patch 1).
>
>   [1/3] licenses: Add Expat No Attribution license.
>   [2/3] gnu: Add patatt.
>   [3/3] gnu: b4: Update to 0.7.0.

b4 and patatt both build for me, and I was able to check the DKIM
signature and generate a git-am-ready mbox with it.

--8<---------------cut here---------------start------------->8---
~/src/linux $ b4 am 20200313231252.64999-1-keescook@chromium.org
Looking up https://lore.kernel.org/r/20200313231252.64999-1-keescook%40chromium.org
Analyzing 5 messages in the thread
Checking attestation on all messages, may take a moment...
---
  ✓ [PATCH v2 1/2] selftests/harness: Move test child waiting logic
  ✓ [PATCH v2 2/2] selftests/harness: Handle timeouts cleanly
  ---
  ✓ Signed: DKIM/chromium.org
---
Total patches: 2
---
Cover: ./v2_20200313_keescook_selftests_harness_handle_timeouts_cleanly.cover
 Link: https://lore.kernel.org/r/20200313231252.64999-1-keescook@chromium.org
 Base: not found
       git am ./v2_20200313_keescook_selftests_harness_handle_timeouts_cleanly.mbx
--8<---------------cut here---------------end--------------->8---

Thanks for working on this!