#!/bin/bash --posix
# Copyright 2014 The Bazel Authors. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# This script was generated from java_stub_template.txt.  Please
# don't edit it directly.
#
# If present, these flags should either be at the beginning of the command
# line, or they should be wrapped in a --wrapper_script_flag=FLAG argument.
#
# --debug               Launch the JVM in remote debugging mode listening
# --debug=<port>        to the specified port or the port set in the
#                       DEFAULT_JVM_DEBUG_PORT environment variable (e.g.
#                       'export DEFAULT_JVM_DEBUG_PORT=8000') or else the
#                       default port of 5005.  The JVM starts suspended
#                       unless the DEFAULT_JVM_DEBUG_SUSPEND environment
#                       variable is set to 'n'.
# --main_advice=<class> Run an alternate main class with the usual main
#                       program and arguments appended as arguments.
# --main_advice_classpath=<classpath>
#                       Prepend additional class path entries.
# --jvm_flag=<flag>     Pass <flag> to the "java" command itself.
#                       <flag> may contain spaces. Can be used multiple times.
# --jvm_flags=<flags>   Pass space-separated flags to the "java" command
#                       itself. Can be used multiple times.
# --singlejar           Start the program from the packed-up deployment
#                       jar rather than from the classpath.
# --print_javabin       Print the location of java executable binary and exit.
#
# The remainder of the command line is passed to the program.

# Make it easy to insert 'set -x' or similar commands when debugging problems with this script.
eval "$JAVA_STUB_DEBUG"

# Prevent problems where the caller has exported CLASSPATH, causing our
# computed value to be copied into the environment and double-counted
# against the argv limit.
unset CLASSPATH

JVM_FLAGS_CMDLINE=()

# Processes an argument for the wrapper. Returns 0 if the given argument
# was recognized as an argument for this wrapper, and 1 if it was not.
function process_wrapper_argument() {
  case "$1" in
    --debug) JVM_DEBUG_PORT="${DEFAULT_JVM_DEBUG_PORT:-5005}" ;;
    --debug=*) JVM_DEBUG_PORT="${1#--debug=}" ;;
    --main_advice=*) MAIN_ADVICE="${1#--main_advice=}" ;;
    --main_advice_classpath=*) MAIN_ADVICE_CLASSPATH="${1#--main_advice_classpath=}" ;;
    --jvm_flag=*) JVM_FLAGS_CMDLINE+=( "${1#--jvm_flag=}" ) ;;
    --jvm_flags=*) JVM_FLAGS_CMDLINE+=( ${1#--jvm_flags=} ) ;;
    --singlejar) SINGLEJAR=1 ;;
    --print_javabin) PRINT_JAVABIN=1 ;;
    *)
      return 1 ;;
  esac
  return 0
}

die() {
  printf "%s: $1\n" "$0" "${@:2}" >&2
  exit 1
}

# Parse arguments sequentially until the first unrecognized arg is encountered.
# Scan the remaining args for --wrapper_script_flag=X options and process them.
ARGS=()
for ARG in "$@"; do
  if [[ "$ARG" == --wrapper_script_flag=* ]]; then
    process_wrapper_argument "${ARG#--wrapper_script_flag=}" \
      || die "invalid wrapper argument '%s'" "$ARG"
  elif [[ "${#ARGS}" > 0 ]] || ! process_wrapper_argument "$ARG"; then
    ARGS+=( "$ARG" )
  fi
done

# Find our runfiles tree.  We need this to construct the classpath
# (unless --singlejar was passed).
#
# Call this program X.  X was generated by a java_binary or java_test rule.
# X may be invoked in many ways:
#   1a) directly by a user, with $0 in the output tree
#   1b) via 'bazel run' (similar to case 1a)
#   2) directly by a user, with $0 in X's runfiles tree
#   3) by another program Y which has a data dependency on X, with $0 in Y's runfiles tree
#   4) via 'bazel test'
#   5) by a genrule cmd, with $0 in the output tree
#   6) case 3 in the context of a genrule
#
# For case 1, $0 will be a regular file, and the runfiles tree will be
# at $0.runfiles.
# For case 2 or 3, $0 will be a symlink to the file seen in case 1.
# For case 4, $JAVA_RUNFILES and $TEST_SRCDIR should already be set.
# Case 5 is handled like case 1.
# Case 6 is handled like case 3.

case "$0" in
  /*) self="$0" ;;
  *)  self="$PWD/$0" ;;
esac

if [[ "$SINGLEJAR" != 1 || "%needs_runfiles%" == 1 ]]; then
  if [[ -z "$JAVA_RUNFILES" ]]; then
    while true; do
      if [[ -e "$self.runfiles" ]]; then
        JAVA_RUNFILES="$self.runfiles"
        break
      fi
      if [[ $self == *.runfiles/* ]]; then
        JAVA_RUNFILES="${self%.runfiles/*}.runfiles"
        # don't break; this value is only a last resort for case 6b
      fi
      if [[ ! -L "$self" ]]; then
        break
      fi
      readlink="$(readlink "$self")"
      if [[ "$readlink" = /* ]]; then
        self="$readlink"
      else
        # resolve relative symlink
        self="${self%/*}/$readlink"
      fi
    done
    if [[ -n "$JAVA_RUNFILES" ]]; then
      export TEST_SRCDIR=${TEST_SRCDIR:-$JAVA_RUNFILES}
    elif [[ -f "${self}_deploy.jar" && "%needs_runfiles%" == 0 ]]; then
      SINGLEJAR=1;
    else
      die 'Cannot locate runfiles directory. (Set $JAVA_RUNFILES to inhibit searching.)'
    fi
  fi
fi

# This script is running with msys on Windows, so CLASSPATH has to be unix format. If JAVA_RUNFILES
# is like C:/blah/blah, we need convert it to /c/blah/blah, otherwise CLASSPATH doesn't work.
if [ ${JAVA_RUNFILES:1:1} == : ]; then
  JAVA_RUNFILES=$(cygpath --unix "$JAVA_RUNFILES")
fi

# Set JAVABIN to the path to the JVM launcher.
%javabin%

if [[ "$PRINT_JAVABIN" == 1 || "%java_start_class%" == "--print_javabin" ]]; then
  echo -n "$JAVABIN"
  exit 0
fi

if [[ "$SINGLEJAR" == 1 ]]; then
  CLASSPATH="${self}_deploy.jar"
  # Check for the deploy jar now.  If it doesn't exist, we can print a
  # more helpful error message than the JVM.
  [[ -r "$CLASSPATH" ]] \
    || die "Option --singlejar was passed, but %s does not exist.\n  (You may need to build it explicitly.)" "$CLASSPATH"
else
  # Create the shortest classpath we can, by making it relative if possible.
  RUNPATH="${JAVA_RUNFILES}/%workspace_prefix%"
  RUNPATH="${RUNPATH#$PWD/}"
  CLASSPATH=%classpath%
fi

if [[ -n "$JVM_DEBUG_PORT" ]]; then
  JVM_DEBUG_SUSPEND=${DEFAULT_JVM_DEBUG_SUSPEND:-"y"}
  JVM_DEBUG_FLAGS="-agentlib:jdwp=transport=dt_socket,server=y,suspend=${JVM_DEBUG_SUSPEND},address=${JVM_DEBUG_PORT}"
fi

if [[ -n "$MAIN_ADVICE_CLASSPATH" ]]; then
  CLASSPATH="${MAIN_ADVICE_CLASSPATH}:${CLASSPATH}"
fi

# Check if TEST_TMPDIR is available to use for scratch.
if [[ -n "$TEST_TMPDIR" && -d "$TEST_TMPDIR" ]]; then
  JVM_FLAGS+=" -Djava.io.tmpdir=$TEST_TMPDIR"
fi

ARGS=(
  ${JVM_DEBUG_FLAGS}
  ${JVM_FLAGS}
  %jvm_flags%
  "${JVM_FLAGS_CMDLINE[@]}"
  ${MAIN_ADVICE}
  %java_start_class%
  "${ARGS[@]}")

# Linux per-arg limit MAX_ARG_STRLEN == 128k!
if (("${#CLASSPATH}" > 120000)); then
  set +o posix  # Enable process substitution.
  exec $JAVABIN -classpath @<(echo $CLASSPATH) "${ARGS[@]}"
else
  exec $JAVABIN -classpath $CLASSPATH "${ARGS[@]}"
fi