repackjre.sh

#!/bin/bash
set -e

## Usage:
## ./repackjre.sh [path_to_normal_jre_tarballs] [output_path]

# set args
export in="$1"
export out="$2"

# set working dirs
work="$in/work"
work1="$in/work1"

# make sure paths exist
mkdir -p $work
mkdir -p $work1
mkdir -p "$out"

compress_jars(){
  find ./ -name '*.jar' -execdir pack200 -S-1 -g -G -E9 {}.pack {} \;
  find ./ -name '*.jar' -execdir rm {} \;
}

# here comes a not-so-complicated functions to easily make desired arch
## Usage: makearch [jre_libs_dir_name] [name_in_tarball]
makearch () {
  echo "Making $2...";
  cd "$work";
  tar xf $(find "$in" -name jre8-$2-*release.tar.xz) > /dev/null;
  
  # Remove unused stuff before moving it
  rm bin/rmid
  rm bin/keytool
  rm bin/rmiregistry
  rm bin/tnameserv
  rm bin/policytool
  rm bin/orbd
  rm bin/servertool
  
  mv release "$work1"/;
  mv bin "$work1"/;
  mkdir -p "$work1"/lib;
  mv lib/$1 "$work1"/lib/;
  mv lib/jexec "$work1"/lib/;
  

  
  
  
  XZ_OPT="-6 --threads=0" tar cJf bin-$2.tar.xz -C "$work1" . > /dev/null 2>&1;
  mv bin-$2.tar.xz "$out"/;
  rm -rf "$work"/*; 
  rm -rf "$work1"/*; 
  }

# this one's static
makeuni () { 
  echo "Making universal...";
  cd "$work";
  tar xf $(find "$in" -name jre8-arm64-*release.tar.xz) > /dev/null; rm -rf bin;
  rm -rf lib/aarch64;
  rm lib/jexec;
  rm release;
  
  #find ./lib/ext ! -name 'zipfs.jar' -type f -exec rm -f {} +
  rm -rf lib/jfr
  rm -rf man
  
  compress_jars
  XZ_OPT="-6 --threads=0" tar cJf universal.tar.xz * > /dev/null 2>&1;
  mv universal.tar.xz "$out"/;
  rm -rf "$work"/*;
}



# now time to use them!
makeuni
makearch aarch32 arm
makearch aarch64 arm64
makearch i386 x86
makearch amd64 x86_64

# if running under GitHub Actions, write commit sha, else formatted system date
if [[ -n "$GITHUB_SHA" ]]
then
echo $GITHUB_SHA>"$out"/version
else
date +%Y%m%d>"$out"/version
fi