Without a seed, the "random" script path locations for the remote-exec
provisioner were actually deterministic!
Every rand.Int31() would return the same pseudorandom chain starting w/
the numbers: 1298498081, 2019727887, 1427131847, 939984059, ...
So here we properly seed the communicators so the script paths are
actually random, and multiple runs on a single remote host have much
less chance of clobbering each other.
Fixes#4186
Kudos to @DustinChaloupka for the correct hunch leading to this fix!
As the command completes, the winrm.Command does not wait for its copy of
the remote.Command streams to report itself completed.
This adds an additional sync.WaitGroup to ensure that copy is finished up
before moving on, solving the data race.
Fixes the following data race:
```
==================
WARNING: DATA RACE
Read by goroutine 6:
github.com/hashicorp/terraform/communicator/winrm.TestStart()
/Users/phinze/go/src/github.com/hashicorp/terraform/communicator/winrm/communicator_test.go:79 +0xa44
testing.tRunner()
/private/var/folders/vd/7l9ys5k57l91x63sh28wl_kc0000gn/T/workdir/go/src/testing/testing.go:456 +0xdc
Previous write by goroutine 14:
bytes.(*Buffer).ReadFrom()
/private/var/folders/vd/7l9ys5k57l91x63sh28wl_kc0000gn/T/workdir/go/src/bytes/buffer.go:174 +0x465
io.copyBuffer()
/private/var/folders/vd/7l9ys5k57l91x63sh28wl_kc0000gn/T/workdir/go/src/io/io.go:375 +0x1a5
io.Copy()
/private/var/folders/vd/7l9ys5k57l91x63sh28wl_kc0000gn/T/workdir/go/src/io/io.go:351 +0x78
Goroutine 6 (running) created at:
testing.RunTests()
/private/var/folders/vd/7l9ys5k57l91x63sh28wl_kc0000gn/T/workdir/go/src/testing/testing.go:561 +0xaa3
testing.(*M).Run()
/private/var/folders/vd/7l9ys5k57l91x63sh28wl_kc0000gn/T/workdir/go/src/testing/testing.go:494 +0xe4
main.main()
github.com/hashicorp/terraform/communicator/winrm/_test/_testmain.go:62 +0x20f
Goroutine 14 (finished) created at:
github.com/hashicorp/terraform/communicator/winrm.runCommand()
/Users/phinze/go/src/github.com/hashicorp/terraform/communicator/winrm/communicator.go:151 +0xf8
==================
```
I added a debug log line in the last commit, only to find out it’s now
logging the same info twice. So removed the double entry and tweaked
the existing once.
* We now return an error when you set the script_path to
C:\Windows\Temp explaining this is currently not supported
* The fix in PR #1588 is converted to the updated setup in this PR
including the unit tests
Last thing to do is add a few tests for the WinRM communicator…
Paul Hinze