Unable to install with tanka by following instructions

[ghost]

Hi I'am doing all required steps from Installing Loki with Tanka guide and get:

# tk show environments/loki
Evaluating jsonnet: RUNTIME ERROR: couldn't open import "k.libsonnet": no match locally or in the Jsonnet library paths
	/data/foo/vendor/ksonnet-util/kausal.libsonnet:2:11-31	thunk <k> from <$>
	/data/foo/vendor/ksonnet-util/kausal.libsonnet:4:1-2	$
	/data/foo/vendor/loki/loki.libsonnet:1:2-40	$
	main.jsonnet:2:14-42	thunk <loki> from <$>
	main.jsonnet:5:1-5	$
	During evaluation

Maybe some steps missing in the guide?

[sandeepsukhani]

Have you followed all the steps from https://github.com/grafana/loki/blob/master/production/ksonnet/README.md#prerequisites

There is a step to get k.libsonnet and k8s.libsonnet

[ghost]

@sandlis Yes! There are steps I did:

# tk init
Directory structure set up! Remember to configure the API endpoint:
`tk env set environments/default --server=127.0.0.1:6443`

# tk env add environments/loki --namespace=loki

# tk env set environments/loki --server=https://localhost:6443
updated spec.apiServer (` -> `https://localhost:6443`)

# jb install github.com/ksonnet/ksonnet-lib/ksonnet.beta.3/k.libsonnet
GET https://github.com/ksonnet/ksonnet-lib/archive/0d2f82676817bbf9e4acf6495b2090205f323b9f.tar.gz 200

# jb install github.com/ksonnet/ksonnet-lib/ksonnet.beta.3/k8s.libsonnet
GET https://github.com/ksonnet/ksonnet-lib/archive/0d2f82676817bbf9e4acf6495b2090205f323b9f.tar.gz 200

# jb install github.com/grafana/loki/production/ksonnet/loki
GET https://github.com/grafana/loki/archive/a5765b57bfb19ef65a0cad404545f34111e94c58.tar.gz 200
GET https://github.com/grafana/jsonnet-libs/archive/8f9d72b2e35b5f3cc1b7c2a8af9bbae7658804e2.tar.gz 200
GET https://github.com/grafana/jsonnet-libs/archive/8f9d72b2e35b5f3cc1b7c2a8af9bbae7658804e2.tar.gz 200
GET https://github.com/grafana/jsonnet-libs/archive/8f9d72b2e35b5f3cc1b7c2a8af9bbae7658804e2.tar.gz 200

# vim environments/loki/main.jsonnet

# tk show environments/loki
Evaluating jsonnet: RUNTIME ERROR: couldn't open import "k.libsonnet": no match locally or in the Jsonnet library paths
	/data/foo/vendor/ksonnet-util/kausal.libsonnet:2:11-31	thunk <k> from <$>
	/data/foo/vendor/ksonnet-util/kausal.libsonnet:4:1-2	$
	/data/foo/vendor/loki/loki.libsonnet:1:2-40	$
	main.jsonnet:2:14-42	thunk <loki> from <$>
	main.jsonnet:5:1-5	$
	During evaluation

# cat jsonnetfile.json
{
  "dependencies": [
    {
      "name": "k.libsonnet",
      "source": {
        "git": {
          "remote": "https://github.com/ksonnet/ksonnet-lib",
          "subdir": "ksonnet.beta.3/k.libsonnet"
        }
      },
      "version": "master"
    },
    {
      "name": "k8s.libsonnet",
      "source": {
        "git": {
          "remote": "https://github.com/ksonnet/ksonnet-lib",
          "subdir": "ksonnet.beta.3/k8s.libsonnet"
        }
      },
      "version": "master"
    },
    {
      "name": "loki",
      "source": {
        "git": {
          "remote": "https://github.com/grafana/loki",
          "subdir": "production/ksonnet/loki"
        }
      },
      "version": "master"
    }
  ]
}

[sandeepsukhani]

can you please try changing k.libsonnet import to ksonnet.beta.3/k.libsonnet in vendor/ksonnet-util/kausal.libsonnet and see if error goes away?
Please do the same for k8s.libsonnet if you see a similar error for that and let me know whether it works.

[sh0rez]

(Tanka maintainer here)

Unfortunately, the the above won't work at the moment. jsonnet-bundler removed support for installing single files (which is by design and won't change), so you have no chance to get jb install this library at the top level (k.libsonnet).

Instead, it will prefix it with the package name (e.g. ksonnet.beta.3/k.libsonnet).

But the other libraries you are importing here won't allow this scheme, as they have k.libsonnet hard-coded.

The only fix at the moment before we work this out is to link those files in place manually:

# install the package
$ jb install github.com/ksonnet/ksonnet-lib/ksonnet.beta.3

# link them to the old name
$ ln -s vendor/ksonnet.beta.3/k.libsonnet lib/k.libsonnet
$ ln -s vendor/ksonnet.beta.3/k8s.libsonnet lib/k8s.libsonnet

Make sure to link into lib/ and NOT into vendor/ because jb will clean all files from vendor/ it does not manage.

[vinodkottem]

can you please try changing k.libsonnet import to ksonnet.beta.3/k.libsonnet in vendor/ksonnet-util/kausal.libsonnet and see if error goes away?
Please do the same for k8s.libsonnet if you see a similar error for that and let me know whether it works.

It works

[sh0rez]

can you please try changing k.libsonnet import to ksonnet.beta.3/k.libsonnet in vendor/ksonnet-util/kausal.libsonnet and see if error goes away?
Please do the same for k8s.libsonnet if you see a similar error for that and let me know whether it works.

It works

That is NOT a solution you should even consider to use. On the next run the bundles will revert that change and you are back to zero.

Instead, create a file called k.libsonnet in the lib folder with the following line in it:

import "ksonnet.beta.3/k.libsonnet"

[vinodkottem]

can you please try changing k.libsonnet import to ksonnet.beta.3/k.libsonnet in vendor/ksonnet-util/kausal.libsonnet and see if error goes away?
Please do the same for k8s.libsonnet if you see a similar error for that and let me know whether it works.

It works

That is NOT a solution you should even consider to use. On the next run the bundles will revert that change and you are back to zero.

Instead, create a file called k.libsonnet in the lib folder with the following line in it:

import "ksonnet.beta.3/k.libsonnet"

You are right @sh0rez . This is simple.
My bad, I missed to install jb install github.com/ksonnet/ksonnet-lib/ksonnet.beta.3 this when I tried your solution and then went on with other solution.

[sh0rez]

Cool! The docs on https://tanka.dev are in the process of being updated, this will be included as well.

I will add a link here then as well, so that hopefully access to this info becomes better!

[chancez]

@sh0rez Why is this closed? This still seems to be an issue when following the instructions at https://github.com/grafana/loki/tree/master/production/ksonnet

[sh0rez]

You are right, the docs still include invalid information. tk init takes care of installing k.libsonnet now (needs Tanka master for now, release expected for tomorrow).

I'll add a PR to resolve this