Add a CI workflow checking if the links used for precompileds are working

Author: varsill

.github/workflows/check_links.yml

@@ -0,0 +1,47 @@
+name: Check precompiled dependency links
+
+on:
+  schedule:
+    - cron: "0 6 * * *"
+  workflow_dispatch:
+
+permissions:
+  issues: write
+
+jobs:
+  check_links:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: erlef/setup-beam@v1
+        with:
+          otp-version: "27"
+          elixir-version: "1.18"
+
+      - run: mix deps.get
+
+      - run: mix run scripts/check_links.exs
+
+      - name: Open issue on failure
+        if: failure()
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const title = "Broken precompiled dependency links";
+            const open = await github.rest.issues.listForRepo({
+              ...context.repo,
+              state: "open",
+              labels: "broken-links",
+            });
+            if (open.data.length === 0) {
+              await github.rest.issues.create({
+                ...context.repo,
+                title,
+                labels: ["broken-links"],
+                body:
+                  "The daily link check failed - some precompiled dependency links " +
+                  "are broken. See the workflow run for the list of broken URLs: " +
+                  `${context.serverUrl}/${context.repo.owner}/${context.repo.repo}/actions/runs/${context.runId}`,
+              });
+            }

lib/membrane_precompiled_dependency_provider.ex

@@ -39,13 +39,17 @@ defmodule Membrane.PrecompiledDependencyProvider do
   Get URL of a precompiled build of given dependency for a platform from which this function is being
   called. 
 
-  A specific version of the dependency can be provided with `:version` option or through config 
+  A specific version of the dependency can be provided with `:version` option or through config
   (see `t:version_config/0`). If provided in both ways, the config value will be taken.
   For generic dependencies this version needs to be the same as a release name from the
   repository of the precompiled dependency, but without the leading "v". By default the latest
   version is chosen.
+
+  The target platform can be overridden with the `:target` option (a map in the format returned
+  by `Bundlex.get_target/0`). By default the platform from which this function is being called
+  is used.
   """
-  @spec get_dependency_url(precompiled_dependency(), version: String.t()) ::
+  @spec get_dependency_url(precompiled_dependency(), version: String.t(), target: map()) ::
           String.t() | nil
   def get_dependency_url(dependency, options \\ [])
 
@@ -55,7 +59,7 @@ defmodule Membrane.PrecompiledDependencyProvider do
     generic_url_prefix =
       get_generic_dependency_url_prefix(:ffmpeg, version)
 
-    case Bundlex.get_target() do
+    case resolve_target(options) do
       %{abi: "musl"} ->
         nil
 
@@ -89,7 +93,7 @@ defmodule Membrane.PrecompiledDependencyProvider do
     generic_url_prefix =
       get_generic_dependency_url_prefix(generic_dependency, version)
 
-    case Bundlex.get_target() do
+    case resolve_target(options) do
       %{abi: "musl"} ->
         nil
 
@@ -110,6 +114,15 @@ defmodule Membrane.PrecompiledDependencyProvider do
     end
   end
 
+  @doc false
+  @spec known_ffmpeg_versions() :: [String.t()]
+  def known_ffmpeg_versions(), do: ["6.0.1", "6.1.3", "7.1.2", "8.0", "latest"]
+
+  @spec resolve_target(version: String.t(), target: map()) :: map()
+  defp resolve_target(opts) do
+    Keyword.get_lazy(opts, :target, &Bundlex.get_target/0)
+  end
+
   @spec resolve_version(precompiled_dependency(), version: String.t()) :: String.t()
   defp resolve_version(dependency, opts) do
     opts_version = Keyword.get(opts, :version, "latest")