https://bugs.freedesktop.org/show_bug.cgi?id=95358
--- Comment #4 from Andy Furniss adf.lists@gmail.com --- Possible progress with the git aspect - while reading about reflog I saw a comment which lead me to doing -
git log --walk-reflogs origin/drm-next-4.7-wip-dal
which apparently gets me a sha for every time I did git fetch origin and dal got updated.
Looks promising, but I haven't had time to test it out yet.