Arvados

Currently, saving time by reusing temp dirs involves passing a growing list of arguments to run-tests like GOPATH=/tmp/1 VENVDIR=/tmp/2. If you let run-tests.sh do its own thing, it makes a number of temp dirs in /tmp/.

Better way:

• When no override args are given, make one tempdir and put VENVDIR, GOPATH, etc. inside that. Call them VENVDIR, GOPATH, etc.
• When a --temp arg is given, use that as the tempdir. Create whatever VENVDIR, GOPATH, etc. dirs don't already exist there.

Old recipe for reusing your tmp dirs:

1. Run once with --leave-temp
2. Copy & paste the GOPATH="/tmp/foo" etc. from the end of run-tests's output into your next command line, and run that from now on

New recipe for reusing your tmp dirs:

1. Run "run-tests.sh --temp ~/.cache/arvados-build" one or more times