Assets from git tarballs cannot be extracted

[nikkictl]

Assets from git tarballs cannot be extracted
Requires mholt/archiver#27

Expected Behavior

An asset with the url of an archived git tarball gets extracted, and a check can execute its scripts.

Current Behavior

An asset with the url of an archived git tarball cannot be extracted, therefore the check does not execute.

Possible Solution

mholt/archiver#66 gets merged and we update our dependency to that commit.

sensu-go/Gopkg.toml

Lines 64 to 66 in 2d07f04

	[[constraint]]
	name = "github.com/mholt/archiver"
	revision = "e4ef56d48eb029648b0e895bb0b6a393ef0829c3"

Steps to Reproduce (for bugs)

1. create an asset with the following configuration

{
  "type": "Asset",
  "spec": {
    "name": "check-cpu.sh",
    "url": "/~https://github.com/sensu-plugins/sensu-plugins-cpu-checks/archive/2.1.0.tar.gz",
    "sha512": "da4f4eb7b16d18c7e870efcb145b2b09234836e7bb3218f58adf376ba4cb84ddd2743356aa89c22509da8c5f552eaf98eb721bc7e18e1832f664142da67b06df",
    "metadata": null,
    "filters": [],
    "organization": "default"
  }
}

2. create a check with the following configuration which invokes said asset

{
  "type": "CheckConfig",
  "spec": {
    "command": "check-cpu.sh -w 85 -c 95",
    "environment": "default",
    "handlers": [],
    "high_flap_threshold": 0,
    "interval": 10,
    "low_flap_threshold": 0,
    "name": "check-cpu-with-asset",
    "organization": "default",
    "publish": true,
    "runtime_assets": [
      "check-cpu.sh"
    ],
    "subscriptions": [
      "misc"
    ],
    "proxy_entity_id": "",
    "check_hooks": null,
    "stdin": false,
    "subdue": null,
    "ttl": 0,
    "timeout": 0,
    "round_robin": false,
    "output_metric_format": "",
    "output_metric_handlers": []
  }
}

3. check output: error installing dependencies: error extracting asset: pax_global_header: unknown type flag: g

Context

Assets from git urls do not get extracted.

Your Environment

• Sensu version used (sensuctl, sensu-backend, and/or sensu-agent): 6e1d8f7
• Installation method (packages, binaries, docker etc.): packages
• Operating System and version (e.g. Ubuntu 14.04): ubuntu-xenial-16.04-amd64

[nikkictl]

Due to inactivity on mholt/archiver#66, I've opened mholt/archiver#76 to address mholt/archiver#27.