Jeff King authored Aug 26, 2014 and Junio C Hamano committed Aug 26, 2014

The log-tree code keeps a "struct decoration" hash to show
text decorations for each commit during log traversals. It
makes this available to other files by providing global
access to the hash. This can result in other code adding
entries that do not conform to what log-tree expects.

For example, the bisect code adds its own "dist"
decorations to be shown. Originally the bisect code was
correct, but when the name_decoration code grew a new field
in eb3005e2

 (commit.h: add 'type' to struct name_decoration,
2010-06-19), the bisect code was not updated. As a result,
the log-tree code can access uninitialized memory and even
segfault.

We can fix this by making name_decoration's adding function
public. If all callers use it, then any changes to struct
initialization only need to happen in one place (and because
the members come in as parameters, the compiler can notice a
caller who does not supply enough information).

As a bonus, this also means that the decoration hashes
created by the bisect code will use less memory (previously
we over-allocated space for the distance integer, but now we
format it into a temporary buffer and copy it to the final
flex-array).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>