For patchtest, it would be quite useful to have a new key-value of the current head at time of submission, i.e. head-at-submission-time:f0d128ea0dfc2c403ff53a1ac1db3521854b63d5, in the stored mbox:

From patchwork Thu Jun 29 16:40:49 2017
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Subject: [v4,1/4] export: new plugin to export the devtool workspace
From: Leonardo Sandoval <leonardo.sandoval.gonzalez@linux.intel.com>
X-Patchwork-Id: 141371
head-at-submission-time:f0d128ea0dfc2c403ff53a1ac1db3521854b63d5
Message-Id: <6bc25ed3eb36791b66c9d187ba145ee34afa6c54.1498754105.git.leonardo.sandoval.gonzalez@linux.intel.com>
To: openembedded-core@lists.openembedded.org
Date: Thu, 29 Jun 2017 09:40:49 -0700

with this key-value info, patchtest can easily move to a base commit and test the corresponding mbox/patch  and (in theory) allowing all tests to be executed because patch merge is possible.