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Symlink /app to real app dir #1
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@jkutner I'm posting here the full output for you from my usage of pack based on your gist Current output:
Stacks
The elixir_buildpack.config
Note that Finally the buildpack.toml from the elixir-cnb project: [buildpack]
id = "hashnuke.elixir"
version = "0.1"
name = "Elixir"
[[stacks]]
id = "heroku-18" I thought I'd share the config so that you can see if I've misconfigured anything, and that it might be useful for debugging. Does
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@hawksight i wasn't able to reproduce this with my sample app but I don't know much about elixir. I cloned the heroku-buildpack-elixir-test app, and added an Do you have an app I can clone and run against? |
Unfortunately all the apps are private so I can't share anything at the moment. But the app I've chosen is the simplest we have and as close to the sample app as I could get. I'll do some digging, there must be some reason why it fails to install hex & rebar. |
Ok not sure what I did but something's working now, or at least more than it did before!
I tried adding a version check before compiling and got:
So seems like the builder image needs to have get the same elixir version? Although It does install those versions previously, so seems a bit off that it returns to the 1.5 version. |
Actually please ignore that last update.. I just cleaned up the cached volumes and it seemed to work perfectly!
I rebuilt everything and the version check was spot on this time. So it must have been caching. |
@hawksight do you think the |
Im not sure if For example here's me shelling in to see whats going on:
I'll try and do some more debugging and see if I can get the app to run and elixir working inside the container. |
i've been playing around with this cnb-shim and the hashnuke-elixir buildpack. i was able to fix the
having fixed that, you'll see a new error: cnb@ac6a5af85afe:/workspace$ mix
/workspace/.platform_tools/erlang/bin/erl: 29: exec: /workspace/app/.platform_tools/erlang/erts-9.1/bin/erlexec: not found the erlexec binary we expected to find can't be found because of a broken symlink: cnb@ac6a5af85afe:/workspace$ ls -la /workspace/app/.platform_tools/
total 8
drwxr-xr-x 2 cnb cnb 4096 Jan 1 1980 .
drwxr-xr-x 3 cnb cnb 4096 Jan 1 1980 ..
lrwxrwxrwx 1 cnb cnb 35 Jan 1 1980 erlang -> /layers/hashnuke.elixir/shim/erlang that cnb@fa78b3081c0d:/workspace$ mix
warning: the VM is running with native name encoding of latin1 which may cause Elixir to malfunction as it expects utf8. Please ensure your locale is set to UTF-8 (which can be verified by running "locale" in your shell)
Could not find Hex, which is needed to build dependency :arc
Shall I install Hex? (if running non-interactively, use "mix local.hex --force") [Yn]
17:31:44.428 [error] Unable to load crypto library. Failed with error:
":load_failed, Failed to load NIF library /workspace/app/.platform_tools/erlang/lib/crypto-4.1/priv/lib/crypto: 'libcrypto.so.1.0.0: cannot open shared object file: No such file or directory'"
OpenSSL might not be installed on this system.
17:31:44.431 [warn] The on_load function for module crypto returned:
{:error, {:load_failed, 'Failed to load NIF library /workspace/app/.platform_tools/erlang/lib/crypto-4.1/priv/lib/crypto: \'libcrypto.so.1.0.0: cannot open shared object file: No such file or directory\''}}
** (Mix) httpc request failed with: {:failed_connect, [{:to_address, {'repo.hex.pm', 443}}, {:inet, [:inet], {:eoptions, {:undef, [{:crypto, :supports, [], []}, {:tls_record, :supported_protocol_versions, 1, [file: 'tls_record.erl', line: 407]}, {:tls_record, :supported_protocol_versions, 0, [file: 'tls_record.erl', line: 247]}, {:ssl, :handle_options, 3, [file: 'ssl.erl', line: 709]}, {:ssl, :connect, 4, [file: 'ssl.erl', line: 115]}, {:http_transport, :connect, 4, [file: 'http_transport.erl', line: 109]}, {:httpc_handler, :connect, 4, [file: 'httpc_handler.erl', line: 790]}, {:httpc_handler, :connect_and_send_first_request, 3, [file: 'httpc_handler.erl', line: 802]}]}}}]}
Could not install Hex because Mix could not download metadata at https://repo.hex.pm/installs/hex-1.x.csv. at this point i've decided to roll my own elixir CNB buildback, but i |
Sounds like Stack Buildpacks will allow us to create/modify the |
@hone we addressed this by modifying cnb-shim to add a |
@kamaln7 we are facing a similar problem and we would be interested in your solution. |
@Haegi sure, here you go: https://github.com/kamaln7/cnb-shim/blob/773a0821c2e94423c53c6249f95b0a393030a1f6/bin/build#L40-L44 Can you let me know if it works for you please? |
@kamaln7 thanks for sending me the snippet, unfortunately, it didn't work in my case. I also tried just adding a file with the same method but the I couldn't find the file. Snippet to add a file: cat <<'EOF' >"${profile_dir}/profile.d/cnb_shim_symlink.sh"
touch $(pwd)/text.txt
EOF To see if there is any file: # build
pack build <my-path> --path <path-to-artefact> --builder heroku/buildpacks --buildpack ~/path/to/cnb
# test
docker run -it --rm --entrypoint /bin/bash <my-app> |
@Haegi docker run -it --rm --entrypoint launcher <my-app> bash
# that should work, but if not, try the absolute path
docker run -it --rm --entrypoint /cnb/lifecycle/launcher <my-app> bash That way, Update: another issue with the fix I linked earlier that @Haegi ran into was that the buildpack they used didn't write profile scripts. The |
create /app/.heroku symlink if needed
The cnb-shim should create a symlink from
/app
to/workspace/app
(or wherever the real app directory is). This will prevent problems with buildpacks that hard code references to/app
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