Can't use coursier bootstrap --standalone --deterministic

[jameskoch]

Trying out coursier bootstrap --standalone for packaging Almond for use w/o network access.

coursier bootstrap almond:0.6.0 \
      --scala-version 2.11.12 \
      --standalone \
      --deterministic \
      -o almond

Unfortunately jvm-repr artifacts being served by jitpack seem to get new timestamps each time, invalidating the deterministic aspect.

This is really just a downstream consequence of jupyter/jvm-repr#15

[alexarchambault]

Nice catch @jameskoch.

jitpack actually does provide timestamps:

$ curl -I https://jitpack.io/com/github/jupyter/jvm-repr/0.4.0/jvm-repr-0.4.0.jar | grep -i last-modified
last-modified: Wed, 09 Jan 2019 18:50:09 Z

It seems they just aren't picked by java.net.HttpURLConnection#getLastModified, that coursier uses under-the-hood, because of the use of the Z time zone. I opened coursier/coursier#1806 for it.

[alexarchambault]

I'll try to find time to look into jupyter/jvm-repr#15, it'd be nice to be able to get rid of jitpack.

[jameskoch]

Nice diagnosis! I ended up just post-processing the jar to reset all timestamps. I'm not done testing yet, but hopeful I can finally move from off my custom classloader hierarchy and onto stock Almond.

While I have you, do you know if the cmd line parsing support passing multiple predef files (--predef file1 --predef file2)? I need one to load all my libraries (interp.load.cp) and then I think another to do some initialization and imports using those libraries.

[alexarchambault]

do you know if the cmd line parsing support passing multiple predef files

It should (and does per its implementation). Doesn't it when you try?

[jameskoch]

I was asking before I got around to trying it, sorry.

0.6.0 ended up working fine using --predef file1 --predef file2. Only small thing was that the syntax shown in --help made me think it would accept --predef file1 file2:

  ...
  --predef-code  <string>
  --predef  <string*>
  ...