Support Docker `volumes` field in Windows. Previously, volumes parser
assumed some Unix-ism (e.g. didn't expect `:` in mount paths).
Here, we use the Docker parser to identify host and container paths.
Docker parsers use different validation logic from our previous unix
implementation: Docker parser accepts single path as a volume entry
(parsing it as a container path with auto-created volume) and enforces
additional checks (e.g. validity of mode). Thereforce, I opted to use
Docker parser only for Windows, and keep Nomad's linux parser to
preserve current behavior.
In Nomad 0.9, we made volume driver handling the same for `""`, and
`"local"` volumes. Prior to Nomad 0.9 however these had slightly different
behaviour for relative paths and named volumes.
Prior to 0.9 the empty string would expand relative paths within the task
dir, and `"local"` volumes that are not absolute paths would be treated
as docker named volumes.
This commit reverts to the previous behaviour as follows:
| Nomad Version | Driver | Volume Spec | Behaviour |
|-------------------------------------------------------------------------
| all | "" | testing:/testing | allocdir/testing |
| 0.8.7 | "local" | testing:/testing | "testing" as named volume |
| 0.9.0 | "local" | testing:/testing | allocdir/testing |
| 0.9.1 | "local" | testing:/testing | "testing" as named volume |
nvidia library use of dynamic library seems to conflict with alpine and
musl based OSes. This adds a `nonvidia` tag to allow compiling nomad
for alpine images.
The nomad releases currently only support glibc based OS environments,
so we default to compiling with nvidia.
Fix AppVeyor failing builds, by moving docker image url test to run on unix
systems only. The used paused image is a linux image only, not
available on Windows.
destCh was being written to by one goroutine and closed by another
goroutine. This panic occurred in Travis:
```
=== FAIL: drivers/docker TestDockerCoordinator_ConcurrentPulls (117.66s)
=== PAUSE TestDockerCoordinator_ConcurrentPulls
=== CONT TestDockerCoordinator_ConcurrentPulls
panic: send on closed channel
goroutine 5358 [running]:
github.com/hashicorp/nomad/drivers/docker.dockerStatsCollector(0xc0003a4a20, 0xc0003a49c0, 0x3b9aca00)
/home/travis/gopath/src/github.com/hashicorp/nomad/drivers/docker/stats.go:108 +0x167
created by
github.com/hashicorp/nomad/drivers/docker.TestDriver_DockerStatsCollector
/home/travis/gopath/src/github.com/hashicorp/nomad/drivers/docker/stats_test.go:33 +0x1ab
```
The 2 ways to fix this kind of error are to either (1) add extra
coordination around multiple goroutines writing to a chan or (2) make it
so only one goroutines writes to a chan.
I implemented (2) first as it's simpler, but @notnoop pointed out since
the same destCh in reused in the stats loop there's now a double close
panic possible!
So this implements (1) by adding a *usageSender struct for handling
concurrent senders and closing.
Reverts hashicorp/nomad#5433
Apparently, channel communications can constitute Happens-Before even for proximate variables, so this syncing isn't necessary.
> _The closing of a channel happens before a receive that returns a zero value because the channel is closed._
https://golang.org/ref/mem#tmp_7
