Fixes#2093
Enable configuring `memory_hard_limit` in the docker config stanza for tasks.
If set, this field will be passed to the container runtime as `--memory`, and
the `memory` configuration from the task resource configuration will be passed
as `--memory_reservation`, creating hard and soft memory limits for tasks using
the docker task driver.
This partially addresses #7799.
Task state filesystems are contained within a subdirectory of their
parent allocation, so almost everything that existed for browsing task
state filesystems was applicable to browsing allocations, just without
the task name prepended to the path. I aimed to push this differential
handling into as few contained places as possible.
The tests also have significant overlap, so this includes an extracted
behavior to run the same tests for allocations and task states.
Ensure that api test agent is terminated gracefully. This is desired for
two purposes:
First, to ensure that the logs are fully flished out. If the agent is
killed mid log line and go test doesn't emit a new line before `---
PASS:` indicator, the test may be marked as failed, even if it passed.
Sample failure is https://circleci.com/gh/hashicorp/nomad/72360 .
Second, ensure that the agent terminates any auxiliary processes (e.g.
logmon, tasks).
Handle case where a snapshot is made before cluster metadata is created.
This fixes a bug where a server may have empty cluster metadata if it
created and installed a Raft snapshot before a new cluster metadata ID is
generated.
This case is very unlikely to arise. Most likely reason is when
upgrading from an old version slowly where servers may use snapshots
before all servers upgrade. This happened for a user with a log line
like:
```
2020-05-21T15:21:56.996Z [ERROR] nomad.fsm: ClusterSetMetadata failed: error=""set cluster metadata failed: refusing to set new cluster id, previous: , new: <<redacted>
```
Fixes#7854
Nomad requires a version of go-getter that is currently in PR (https://github.com/hashicorp/go-getter/pull/256)
We also require some recent bug fix to go-getter around the handling of URL redirects.
Update our vendor'd copy of go-getter to the newly rebased umask changes so that we can incorporate
the latest changes for go-getter.
* changes necessary to support oss licesning shims
revert nomad fmt changes
update test to work with enterprise changes
update tests to work with new ent enforcements
make check
update cas test to use scheduler algorithm
back out preemption changes
add comments
* remove unused method
