tree 774fe5904ceca628b7cbe876bd767864299ec766
parent 384af7ef191b8b3f52b212f6b7f02ace786ba2a9
author Matwey V. Kornilov <matwey.kornilov@gmail.com> 1456925430 +0300
committer Matwey V. Kornilov <matwey.kornilov@gmail.com> 1458288318 +0300

Introduce REBAR_VSN_CACHE_FILE env variable to load/save vsn cache

When REBAR_VSN_CACHE_FILE is set, then vsn cache is loaded from
this file on rebar start and updated when new data.

Under specific circumstances (i.e. in build environments),
full git tree may not be available, but only its snapshot.
We need a way to use preheat vsn cache instead of invocing
git command.

Signed-off-by: Matwey V. Kornilov <matwey.kornilov@gmail.com>