Clojurians Log v2

Is there a straightforward way of getting the generated executable's location at run time?

How would you define minimal startup time? Have you tested how much you can cut from startup time by using direct linking, AOT, removing metadata, etc?

(System/getProperty "user.dir") - What happens with that?

@chris441 He means the executable that is currently being executed. E.g. when you run bb -e '(+ 1 2 3)', you want to see /usr/local/bin/bb or so

Ah, got it

Someone in the GraalVM slack told me that Graal has an API for this

(GraalVM slack = https://app.slack.com/client/TN37RDLPK)

but I haven't found it

One use case for this is to have an upgrade command so an executable can update itself (not sure if that's a good idea, but exploring the possibilities)

Does the answer need to be cross platform? What platform is the query on?

For unix there are PID-related ways to do this.

yes, cross platform

ProcessProperties.getExecutableName()

https://www.graalvm.org/sdk/javadoc/index.html?org/graalvm/nativeimage/ProcessProperties.html

user=> (org.graalvm.nativeimage.ProcessProperties/getExecutableName)
Execution error (Error) at org.graalvm.nativeimage.impl.ImageSingletonsSupport/checkInstalled (ImageSingletonsSupport.java:69).
The class ImageSingletons can only be used when building native images, i.e., when using the native-image command.

should be able to run this within a graalvm native image

wow, the exec method looks interesting: https://www.graalvm.org/sdk/javadoc/index.html?org/graalvm/nativeimage/ProcessProperties.html

@lukaszkorecki That's what you asked recently ^

$ ./bb -e '(do (prn (org.graalvm.nativeimage.ProcessProperties/getProcessID)) (org.graalvm.nativeimage.ProcessProperties/exec (fs/path "/bin/bash") (into-array String [""])))'
28122
bash-3.2$ ps aux | grep 28122
borkdude         28124   0.0  0.0  4399112    904 s015  S+    9:23PM   0:00.00 grep 28122
borkdude         28122   0.0  0.0  4431696   1600 s015  S     9:23PM   0:00.03 TERM_SESSION_ID=w2t2p0:5035ECFF-A5DD-4DF9-9A67-6C736151E9AF

Getting the executable name:

$ ./bb -e '(org.graalvm.nativeimage.ProcessProperties/getExecutableName)'
"/Users/borkdude/Dropbox/dev/clojure/babashka/bb"