out of disk space on the bot

[John Meinel]

>       verify_command = export GOPATH=/home/tarmac/trees; godeps -u
> dependencies.tsv && export TMPDIR=`mktemp -d --tmpdir
> juju-core-test.XXXXXX` && go fmt ./... && go install ./... && go test
> ./...; STATUS=$?; rm -rf $TMPDIR; killall -u tarmac mongod; exit $STATUS
>
>
This line caused 2 problems which have now been addressed:

a) TestRunStop creates a unix socket in
$TMPDIR/$GOCHECKTMP/var/lib/juju/agent.socket which turns out to grow
larger than the 107 characters that you're allowed to put in a socket name.
(see https://bugs.launchpad.net/unity-scopes-api/+bug/1252588 for a case
where unity ran into the path limit).
So I made the prefix a bit shorter. (I guess we were at 108 characters
exactly.)

b) If there was a failure earlier in the run (before we overrode TMPDIR) it
could cause the above script to rm -rf /tmp. So I changed it to use a local
var and only delete that one.

I don't know *how* it managed it, but somehow it actually deleted /tmp
completely. I would have thought only root could do that.

New command is:
 verify_command = export GOPATH=/home/tarmac/trees; godeps -u
dependencies.tsv && MYTMP=`mktemp -d --tmpdir jctest.XXX` && export
TMPDIR="$MYTMP" && go fmt ./... && go install ./... && go test ./...;
STATUS=$?; rm -rf $MYTMP; killall -u tarmac mongod; exit $STATUS

John
=:->
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