From 382f5ff058a4c2fed1e9874bb712b40f16ec1a4e Mon Sep 17 00:00:00 2001
From: Ben Soares <bsoares@dundee.ac.uk>
Date: Mon, 3 Dec 2018 15:18:17 +0000
Subject: [PATCH] JAL-3130 de-multi-release-jar.sh Script to make
 multi-release jar file single release.

---
 utils/de-multi-release-jar.sh          |   77 ++++++++++++++++++++++++++++++++
 utils/{modulify.sh => modulify-jar.sh} |    6 +--
 2 files changed, 80 insertions(+), 3 deletions(-)
 create mode 100755 utils/de-multi-release-jar.sh
 rename utils/{modulify.sh => modulify-jar.sh} (88%)

diff --git a/utils/de-multi-release-jar.sh b/utils/de-multi-release-jar.sh
new file mode 100755
index 0000000..6a3af4f
--- /dev/null
+++ b/utils/de-multi-release-jar.sh
@@ -0,0 +1,77 @@
+#!/usr/bin/env bash
+
+CMD=$(basename $0)
+
+usage() {
+  echo "Usage: $CMD [-v N] /path/to/jarfile" >&2
+  echo "             -v N   build jar with alternative classes for version N of java (optional, defaults to base jar packages which is usually 8)" >&2
+}
+
+usagexit() {
+  usage
+  exit 1
+}
+
+error() {
+  echo $1 >&2
+  usagexit
+}
+
+VERSION=""
+while getopts v: opt
+do
+  case "${opt}"
+    in
+    v) VERSION=${OPTARG};;
+  esac
+done
+shift $((OPTIND-1))
+
+JARFILE=$1
+[ -z $JARFILE ] && usagexit
+[ -f $JARFILE ] || error "No file $JARFILE"
+[ -r $JARFILE ] || error "$JARFILE not readable"
+
+EXT=.jar
+SUFFIX=-SINGLE_RELEASE
+FILENAME=$(basename $JARFILE)
+BASE=$(basename -s $EXT $JARFILE)
+DIR=$(dirname $JARFILE)
+
+TMPDIR=/tmp/$USER-$CMD-$BASE-$$
+
+[ x$FILENAME = x$BASE ] && error "Should be $EXT file"
+
+mkdir -p $TMPDIR || error "Could not create tmp dir $TMPDIR"
+cd $TMPDIR
+jar -xvf $JARFILE > /dev/null
+VDIR=$TMPDIR/META-INF/versions
+
+[ -d $VDIR ] || error "$JARFILE doesn't look like a multi-release jar file"
+
+if [ -z $VERSION ]; then
+  # no version set... nothing to copy
+  echo ""
+elif [ -d $VDIR/$VERSION ]; then
+  # this version has alternative classes for the version asked for, copy them into the base jar
+  tar -cf - -C $VDIR/$VERSION . | tar -xf - -C $TMPDIR
+else
+  echo "No specific classes for version $VERSION" >&2
+  echo "Available alternative versions are" >&2
+  cd $VDIR
+  ls >&2
+fi
+
+# remove the alternative versions
+/bin/rm -r $VDIR
+
+# alter the manifest. note sed on macos is a bit weird
+if [ `uname -s` = "Darwin" ]; then
+  sed -E -i '' 's/^([Mm]ulti-[Rr]elease):).*/\1 false/' $TMPDIR/META-INF/MANIFEST.MF
+else
+  sed -E -i 's/^([Mm]ulti-[Rr]elease):).*/\1 false/' $TMPDIR/META-INF/MANIFEST.MF
+fi
+
+jar -cvf $DIR/${BASE}${SUFFIX}${EXT} -C $TMPDIR . > /dev/null
+rm -rf $TMPDIR
+
diff --git a/utils/modulify.sh b/utils/modulify-jar.sh
similarity index 88%
rename from utils/modulify.sh
rename to utils/modulify-jar.sh
index 428ed6e..65ca36f 100755
--- a/utils/modulify.sh
+++ b/utils/modulify-jar.sh
@@ -27,20 +27,20 @@ FILENAME=$(basename $JARFILE)
 BASE=$(basename -s $EXT $JARFILE)
 DIR=$(dirname $JARFILE)
 
-TMPDIR=/tmp/$USER-$CMD-$BASE
+TMPDIR=/tmp/$USER-$CMD-$BASE-$$
 
 [ x$FILENAME = x$BASE ] && error "Should be $EXT file"
 
 mkdir -p $TMPDIR/jar || error "Could not create tmp dir $TMPDIR/jar"
 mkdir -p $TMPDIR/info || error "Could not create tmp dir $TMPDIR/info"
 cd $TMPDIR/jar
-jar -xvf $JARFILE
+jar -xvf $JARFILE > /dev/null
 jdeps --generate-module-info $TMPDIR/info $JARFILE
 # next line assuming only one module-info.java file created, I think this is always true...? It'll just use the last one if not.
 find $TMPDIR/info -name "module-info.java" -exec /bin/mv {} . \;
 [ -e ./module-info.java ] || error "No module-info.java file found in $TMPDIR/info"
 javac -d $TMPDIR/jar ./module-info.java
-jar -cvf $DIR/${BASE}${SUFFIX}${EXT} -C $TMPDIR/jar .
+jar -cvf $DIR/${BASE}${SUFFIX}${EXT} -C $TMPDIR/jar . > /dev/null
 rm -rf $TMPDIR
 
 
-- 
1.7.10.2