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feat: Deploy only app code, install Elixir via mise on remote #15

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Merged
pepicrft merged 1 commit into from
Mar 28, 2026
+45 −21
Merged

feat: Deploy only app code, install Elixir via mise on remote #15

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66 changes: 45 additions & 21 deletions lib/terrarium/runtime.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -39,9 +39,9 @@ defmodule Terrarium.Runtime do
:telemetry.span([:terrarium, :replicate], %{sandbox: sandbox, otp_version: otp_version}, fn ->
with :ok <- ensure_mise(sandbox),
{:ok, dest} <- resolve_dest(sandbox, dest),
{:ok, erl_path} <- install_erlang(sandbox, otp_version),
{:ok, runtime} <- install_erlang(sandbox, otp_version),
:ok <- deploy_code(sandbox, dest),
{:ok, pid, node} <- start_peer(sandbox, erl_path, dest, opts) do
{:ok, pid, node} <- start_peer(sandbox, runtime, dest, opts) do
Logger.info("Runtime started in sandbox",
sandbox_id: sandbox.id,
node: node,
Expand Down Expand Up @@ -132,28 +132,38 @@ defmodule Terrarium.Runtime do
defp install_erlang(sandbox, otp_version) do
remote_home = resolve_remote_home(sandbox)
mise = "#{remote_home}/.local/bin/mise"
elixir_version = System.version()

Logger.info("Installing Erlang #{otp_version} via mise", sandbox_id: sandbox.id)
Logger.info("Installing Erlang #{otp_version} and Elixir #{elixir_version} via mise",
sandbox_id: sandbox.id
)

case Terrarium.exec(sandbox, "#{mise} install erlang@#{otp_version}", timeout: 600_000) do
{:ok, %{exit_code: 0}} ->
# Get the install path to find the erl binary
case Terrarium.exec(sandbox, "#{mise} where erlang@#{otp_version}") do
{:ok, %{exit_code: 0, stdout: path}} ->
erl_path = Path.join(String.trim(path), "bin/erl")
Logger.info("Erlang #{otp_version} ready", sandbox_id: sandbox.id, erl_path: erl_path)
{:ok, erl_path}
install_cmd = "#{mise} install erlang@#{otp_version} elixir@#{elixir_version}"

{:ok, %{exit_code: code, stderr: stderr}} ->
{:error, {:mise_where_failed, code, stderr}}
case Terrarium.exec(sandbox, install_cmd, timeout: 600_000) do
{:ok, %{exit_code: 0}} ->
with {:ok, %{exit_code: 0, stdout: erl_where}} <-
Terrarium.exec(sandbox, "#{mise} where erlang@#{otp_version}"),
{:ok, %{exit_code: 0, stdout: elixir_where}} <-
Terrarium.exec(sandbox, "#{mise} where elixir@#{elixir_version}") do
erl_path = Path.join(String.trim(erl_where), "bin/erl")
elixir_lib = Path.join(String.trim(elixir_where), "lib")

Logger.info("Runtime ready",
sandbox_id: sandbox.id,
erl_path: erl_path,
elixir_lib: elixir_lib
)

{:error, reason} ->
{:error, reason}
{:ok, %{erl_path: erl_path, elixir_lib: elixir_lib}}
else
{:ok, %{exit_code: code, stderr: stderr}} -> {:error, {:mise_where_failed, code, stderr}}
{:error, reason} -> {:error, reason}
end

{:ok, %{exit_code: code, stderr: stderr}} ->
Logger.error("Erlang installation failed", sandbox_id: sandbox.id, reason: stderr)
{:error, {:erlang_install_failed, code, stderr}}
Logger.error("Installation failed", sandbox_id: sandbox.id, reason: stderr)
{:error, {:install_failed, code, stderr}}

{:error, reason} ->
{:error, reason}
Expand All @@ -172,12 +182,20 @@ defmodule Terrarium.Runtime do
# ============================================================================

defp deploy_code(sandbox, dest) do
# Only deploy application code paths, not OTP or Elixir stdlib.
# Those are already available on the remote via mise.
otp_lib = :code.lib_dir() |> List.to_string()
elixir_lib = :code.lib_dir(:elixir) |> List.to_string() |> Path.dirname()

paths =
:code.get_path()
|> Enum.map(&List.to_string/1)
|> Enum.filter(&File.dir?/1)
|> Enum.reject(fn p ->
String.starts_with?(p, otp_lib) or String.starts_with?(p, elixir_lib)
end)

Logger.debug("Creating tarball from #{length(paths)} code paths", sandbox_id: sandbox.id)
Logger.debug("Creating tarball from #{length(paths)} code paths (app only)", sandbox_id: sandbox.id)

tarball_path = Path.join(System.tmp_dir!(), "terrarium_deploy_#{System.unique_integer([:positive])}.tar.gz")
file_args = Enum.flat_map(paths, fn path -> ["-C", Path.dirname(path), Path.basename(path)] end)
Expand Down Expand Up @@ -215,12 +233,18 @@ defmodule Terrarium.Runtime do
# Peer Node
# ============================================================================

defp start_peer(sandbox, erl_path, dest, opts) do
defp start_peer(sandbox, runtime, dest, opts) do
# Include app code + Elixir stdlib paths
pa_paths = [
"#{dest}/ebin",
"#{runtime.elixir_lib}/*/ebin"
]

peer_opts =
opts
|> Keyword.take([:name, :env, :erl_args])
|> Keyword.put(:pa_paths, ["#{dest}/ebin"])
|> Keyword.put(:erl_cmd, erl_path)
|> Keyword.put(:pa_paths, pa_paths)
|> Keyword.put(:erl_cmd, runtime.erl_path)

Terrarium.Peer.start(sandbox, peer_opts)
end
Expand Down