Register flake output paths with FlakeHub

action.yaml

@@ -94,6 +94,9 @@ inputs:
   flakehub-push-url:
     description: A URL pointing to a `flakehub-push` binary. Overrides all other `flakehub-push-*` options.
     required: false
+  include-output-paths:
+    description: Whether to register the output paths of each flake output with FlakeHub.
+    required: false
 
 # https://docs.github.com/en/actions/creating-actions/metadata-syntax-for-github-actions#runs-for-docker-container-actions
 runs:
@@ -119,6 +122,7 @@ runs:
       FLAKEHUB_PUSH_EXTRA_TAGS: ${{ inputs.extra-tags }}
       FLAKEHUB_PUSH_SPDX_EXPRESSION: ${{ inputs.spdx-expression }}
       FLAKEHUB_PUSH_ERROR_ON_CONFLICT: ${{ inputs.error-on-conflict }}
+      FLAKEHUB_PUSH_INCLUDE_OUTPUT_PATHS: ${{ inputs.include-output-paths }}
       # Also GITHUB_REPOSITORY, GITHUB_REF_NAME, GITHUB_TOKEN, ACTIONS_ID_TOKEN_REQUEST_TOKEN, ACTIONS_ID_TOKEN_REQUEST_URL
     run: |
       if [ "${RUNNER_OS}" == "Linux" ]; then

src/cli/mod.rs

@@ -101,6 +101,9 @@ pub(crate) struct FlakeHubPushCli {
 
     #[clap(flatten)]
     pub instrumentation: instrumentation::Instrumentation,
+
+    #[clap(long, env = "FLAKEHUB_PUSH_INCLUDE_OUTPUT_PATHS", value_parser = EmptyBoolParser, default_value_t = false)]
+    pub(crate) include_output_paths: bool,
 }
 
 #[derive(Clone, Debug)]
@@ -275,6 +278,7 @@ impl FlakeHubPushCli {
             spdx_expression,
             extra_tags,
             error_on_conflict,
+            include_output_paths,
         } = self;
 
         let mut extra_labels: Vec<_> = extra_labels.into_iter().filter(|v| !v.is_empty()).collect();
@@ -457,6 +461,7 @@ impl FlakeHubPushCli {
             extra_labels,
             spdx_expression.0,
             error_on_conflict,
+            include_output_paths,
         )
         .await?;
 
@@ -493,6 +498,7 @@ async fn push_new_release(
     extra_labels: Vec<String>,
     spdx_expression: Option<spdx::Expression>,
     error_if_release_conflicts: bool,
+    include_output_paths: bool,
 ) -> color_eyre::Result<()> {
     let span = tracing::Span::current();
     span.record("upload_name", tracing::field::display(upload_name.clone()));
@@ -552,7 +558,7 @@ async fn push_new_release(
         .pointer("/resolved/dir")
         .and_then(serde_json::Value::as_str);
 
-    let flake_outputs = get_flake_outputs(flake_locked_url).await?;
+    let flake_outputs = get_flake_outputs(flake_locked_url, include_output_paths).await?;
     tracing::debug!("Got flake outputs: {:?}", flake_outputs);
 
     let source = match flake_metadata_value_resolved_dir {

src/flake_info.rs

@@ -132,16 +132,28 @@ pub(crate) async fn get_flake_metadata(directory: &Path) -> color_eyre::Result<s
 }
 
 #[tracing::instrument(skip_all, fields(flake_url,))]
-pub(crate) async fn get_flake_outputs(flake_url: &str) -> color_eyre::Result<serde_json::Value> {
+pub(crate) async fn get_flake_outputs(
+    flake_url: &str,
+    include_output_paths: bool,
+) -> color_eyre::Result<serde_json::Value> {
     let tempdir = tempfile::Builder::new()
         .prefix("flakehub_push_outputs")
         .tempdir()
         .wrap_err("Creating tempdir")?;
 
-    let flake_contents = include_str!("mixed-flake.nix").replace(
-        FLAKE_URL_PLACEHOLDER_UUID,
-        &flake_url.escape_default().to_string(),
-    );
+    let flake_contents = include_str!("mixed-flake.nix")
+        .replace(
+            FLAKE_URL_PLACEHOLDER_UUID,
+            &flake_url.escape_default().to_string(),
+        )
+        .replace(
+            "INCLUDE_OUTPUT_PATHS",
+            if include_output_paths {
+                "true"
+            } else {
+                "false"
+            },
+        );
 
     let mut flake = tokio::fs::File::create(tempdir.path().join("flake.nix")).await?;
     flake.write_all(flake_contents.as_bytes()).await?;

src/mixed-flake.nix

@@ -2,6 +2,8 @@
   inputs.flake.url = "c9026fc0-ced9-48e0-aa3c-fc86c4c86df1";
   outputs = inputs:
     {
+      includeOutputPaths = INCLUDE_OUTPUT_PATHS;
+
       contents =
         let
           getFlakeOutputs = flake:
@@ -69,7 +71,33 @@
                               shortDescription = attrs.shortDescription or null;
                               what = attrs.what or null;
                               #evalChecks = attrs.evalChecks or {};
-                            }
+                            } // (
+                              if inputs.self.includeOutputPaths then
+                                {
+                                  derivation =
+                                    if attrs ? derivation
+                                    then builtins.unsafeDiscardStringContext attrs.derivation.drvPath
+                                    else null;
+                                  outputs =
+                                    if attrs ? derivation
+                                    then
+                                      builtins.listToAttrs
+                                        (
+                                          builtins.map
+                                            (outputName:
+                                              {
+                                                name = outputName;
+                                                value = attrs.derivation.${outputName}.outPath;
+                                              }
+                                            )
+                                            attrs.derivation.outputs
+                                        )
+                                    else
+                                      null;
+                                }
+                              else
+                                { }
+                            )
                         else
                           { };
                     in