Progress output while running native-image

[olafurpg]

Expected behaviour

I'm using GraalVMNativeImagePlugin and when running sbt graalvm-native-image:packageBin I would like to see progress output while the native-image linker is running similar to when I run native-image directly from the command-line. It would be nice to see this output as soon as it appears

[info] [fastpass:4932]    classlist:  19,351.15 ms,  1.18 GB
[info] [fastpass:4932]        (cap):   1,183.22 ms,  1.18 GB
[info] [fastpass:4932]        setup:   2,821.39 ms,  1.18 GB
...

Actual behaviour

There is no progress output from native-image while sbt graalvm-native-image:packageBin is running, which can take several minutes to complete.

I looked at the implementation it uses Process.!(streams.value)and was surprised this does not produce the expected output. Is it maybe necessary to flush somehow?

sbt-native-packager/src/main/scala/com/typesafe/sbt/packager/graalvmnativeimage/GraalVMNativeImagePlugin.scala

Line 113 in 7c28a1f

sys.process.Process(command, targetDirectory) ! log match {

Information

• What sbt-native-packager are you using: 1.7.2
• What sbt version: 1.3.10
• What is your build system: macOS
• What package are you building: native image on my computer with GraalVM 20.1.0 (https://sbt-native-packager.readthedocs.io/en/stable/formats/graalvm-native-image.html)
• What is your target system: macOS

[muuki88]

Thanks @olafurpg for the detailed report 😊

I remember that sbt-scripted had some log buffering enabled that you needed to disable. Maybe this is some similar behaviour. 🤔

What I'm trying to say is that this might be a configuration thing in sbt. However we had a similar report in the gitter channel.