[Gnu-arch-users] getting the diff represented by a revision name

[martin f krafft]

Given a revision name, such as foobar--main--0--patch-4, is it
somehow possible to obtain the diff it encapsulates?

The idea is that arch-trigger gives me foobar--main--0--patch-4 and
I want to include diffs in the commit mails it sends. So, without
some magic to figure out what revision preceeded
foobar--main--0--patch-4 (which is not really trivial), using 'tla
delta', and working with the temporary directory it drops, is there
an easier way?

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