read from stdin if - is specified

Cargo.toml

@@ -101,6 +101,7 @@ array-init = "2.1"
 arrow2 = "0.17"
 arrow2_convert = "0.5.0"
 async-executor = "1.0"
+atty = "0.2"
 backtrace = "0.3"
 bincode = "1.3"
 bitflags = { version = "2.4", features = ["bytemuck"] }

crates/re_data_source/src/data_source.rs

@@ -69,6 +69,16 @@ impl DataSource {
             }
         }
 
+        // Reading from standard input in non-TTY environments (e.g. GitHub Actions, but I'm sure we can
+        // come up with more convoluted than that…) can lead to many unexpected,
+        // platform-specific problems that aren't even necessarily consistent across runs.
+        //
+        // In order to avoid having to swallow errors based on unreliable heuristics (or inversely:
+        // throwing errors when we shouldn't), we just make reading from standard input explicit.
+        if uri == "-" {
+            return DataSource::Stdin;
+        }
+
         let path = std::path::Path::new(&uri).to_path_buf();
 
         if uri.starts_with("file://") || path.exists() {

crates/rerun/src/lib.rs

@@ -142,6 +142,7 @@ pub mod external {
     pub use anyhow;
 
     pub use re_build_info;
+    pub use re_data_source;
     pub use re_data_store;
     pub use re_data_store::external::*;
     pub use re_format;