The venv build process currently executes on
every build, destroying all existing venvs for
the distribution/architecture of the repo server
it executes on, then rebuilds them.
It is also terribly difficult to troubleshoot
due to the fact that it is executed in parallel
through a single bash script using backgrounded
processes.
This patch breaks the build process up into two
parts - the per-venv options files, and the
script that uses the options to build the venvs.
With this breakdown we're able to do the following:
- Only execute a venv rebuild if the venv
options (indexes, requirements) have changed.
- Use the Ansible asynchonous execution to
execute parallel venv builds.
As a very welcome side-effect, this also means
that the venv build execution provides individual
output for success or failures, making it much
easier to see what went wrong when failing.
As part of the patch, the removal of the *.in,
*.txt and *.html files on each wheel build is
taken out. This is to protect the venv options
files. The removal of those files was unnecessary
anyway as they're templated and therefore replaced
by Ansible if they need to be changed.
Change-Id: I063c3addb6fbabb01d620be33aac2cab29a02750
27ec4a229d