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#!/usr/bin/env bash
#
# Coarray Fortran (CAF) Executable Launcher version 2.9.2
#
# Copyright (c) 2015-2020, Sourcery, Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#     * Redistributions of source code must retain the above copyright
#       notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above copyright
#       notice, this list of conditions and the following disclaimer in the
#       documentation and/or other materials provided with the distribution.
#     * Neither the name of the Sourcery, Inc., nor the
#       names of its contributors may be used to endorse or promote products
#       derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL SOURCERY, INC., BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# This script invokes the chosen Fortran compiler with the received command-line
# arguments.  Current assumptions:
#    1. The only argument is either an informational flag or a CAF executable
#       file.
#    2. The environment variable "FC" is used to determine the identity fo the Fortran compiler/linker.
#    3. If "FC" is empty, a default value of "mpifort" is used.

# Exit on error. Append "|| true" if you expect an error.
set -o errexit
# Exit on error inside any functions or subshells.
set -o errtrace
# Do not allow use of undefined vars. Use ${VAR:-} to use an undefined VAR
set -o nounset
# Catch the error in case mysqldump fails (but gzip succeeds) in `mysqldump |gzip`
set -o pipefail
# Turn on traces, useful while debugging but commented out by default
# set -o xtrace


#---------------------
# Configured variables
#---------------------
#
# CAF_VERSION, MPIEXEC, MPIEXEC_NUMPROC_FLAG, MPIEXEC_PREFLAGS, MPIEXEC_POSTFLAGS,
# HAVE_FAILED_IMG
#

caf_version='2.9.2'
CAFRUN="/usr/bin/mpiexec"
if [[ "${CAFRUN}" == @*@ ]]; then
  CAFRUN=mpiexec
fi
have_failed_img=false
if [[ ${have_failed_img} == @*@ ]]; then
  have_failed_img=false
fi
numproc_flag='-n'
if [[ ${numproc_flag} == @*@ ]]; then
  numproc_flag='-np'
fi
preflags=""
preflags="${preflags//;/ }"
if [[ "${preflags}" == @*@ ]]; then
  unset preflags
fi
postflags=""
postflags="${postflags//;/ }"
if [[ "${postflags}" == @*@ ]]; then
  unset postflags
fi
#-------------------------
# End configured variables
#-------------------------

if [[ "${BASH_SOURCE[0]}" != "${0}" ]]; then
  __i_am_main_script="0" # false

  # shellcheck disable=SC2154
  if [[ "${__usage+x}" ]]; then
    if [[ "${BASH_SOURCE[1]}" == "${0}" ]]; then
      __i_am_main_script="1" # true
    fi
    __caf_tmp_source_idx=1
  fi
else
  # shellcheck disable=SC2034
  __i_am_main_script="1" # true
fi

# Set magic variables for current file, directory, os, etc.
__dir="$(cd "$(dirname "${BASH_SOURCE[${__caf_tmp_source_idx:-0}]}")" && pwd)"
__file="${__dir}/$(basename "${BASH_SOURCE[${__caf_tmp_source_idx:-0}]}")"
# shellcheck disable=SC2034
__base="$(basename "${__file}")"
cmd="${__base}"

# Set installation prefix. Compute this dynamically assuming this script is in a bin/ subdir
# Dereference symbolic links and canonicalize (i.e., abs path) prefix in case stow, homebrew, etc being used
# mac OS doesn't have readlink -f, so need to crawl symlinks manually.
# See: https://stackoverflow.com/questions/1055671/how-can-i-get-the-behavior-of-gnus-readlink-f-on-a-mac
current_dir="${PWD}"
cd "${__dir}" || exit 5
  target_file="${__file}"
  max_iter=1000
  iter=0
  while [[ -L "${target_file}" ]]; do
    target_file="$(readlink "${target_file}")"
    cd "$(dirname "${target_file}")" || exit 5
    target_file="$(basename "${target_file}")"
    if ((++iter >= max_iter)); then
      echo "Failed to compute OpenCoarrays instalation prefix!" >&2
      echo "Likely cause: circular symlink cycles." >&2
      echo "Aborting!" >&2
      exit 200
    fi
  done
  true_dir="$(pwd -P)"
  true_dir="${true_dir%/}"
  # shellcheck disable=SC2034
  prefix="${true_dir%/bin}"
  # echo "Install prefix is ${prefix}" # for debugging
cd "${current_dir}" || exit 5
# echo "Current directory is $(pwd)"
# echo "This script is in ${__dir}"

# Error tracing
# requires `set -o errtrace`
__caf_err_report() {
  local error_code
  error_code=${?}
  echo "Error in ${__file} in function ${1} on line ${2}. Please report this error at http://bit.ly/OpenCoarrays-new-issue" >&2
  exit ${error_code}
}
# Always provide an error backtrace
trap '__caf_err_report "${FUNCNAME:-.}" ${LINENO}' ERR


usage() {
  echo ""
  echo " ${cmd} - Coarray Fortran executable launcher for OpenCoarrays"
  echo ""
  echo " Usage: ${cmd} [options] ..."
  echo ""
  echo " Options:"
  echo "   --help, -h               Show this help message"
  echo "   --version, -v, -V        Report version and copyright information"
  echo "   --wraps, -w,             Report info about the wrapped MPI launcher"
  echo "   -np <N>,                 Number of images, N, to execute, N must be a positive integer"
  echo "   -n <N>,                  Same as -np"
  echo "   --reenable-auto-cleanup  Turn off failed images support (if library support is present)"
  echo "                            This option re-enables MPI auto cleanup, which is disabled by"
  echo "                            by default if GFortran/OpenCoarrays/MPI all support failed"
  echo "                            images through MPI ULFM. When MPI auto cleanup is disabled and"
  echo "                            failed image support is present, OpenCoarrays triggers cleanup"
  echo "                            explicitly when a failed/stopped image is encountered in an"
  echo "                            image control statement without a \`stat=\` clause."
  echo "   --show, -s,              Show the command that the wrapper will execute. You can pass"
  echo "                            this as the first argument and then the additional arguments"
  echo "                            that you're planning to pass to perform a dry run."
  echo ""
  echo " Example usage:"
  echo ""
  echo "   ${cmd} -n 2 foo"
  echo "   ${cmd} -np 2 foo foo_arg1 foo_arg2"
  echo "   ${cmd} -v"
  echo "   ${cmd} --help"
  echo "   ${cmd} --show"
  echo "   ${cmd} -s -np 4 my_exe"
  echo "   ${cmd} -np 4 --reenable-auto-cleanup ./my_exe arg1 arg2"
  echo ""
  echo " Notes:"
  echo "   [options] must be a CAF executable file, one of the above arguments,"
  echo "   or an argument to the program name returned by caf --wraps"
  echo ""
}

i=0
disable_failed_images=false
for arg in "${@}"; do
  ((i+=1))
  if [[ "${arg}" == "--reenable-auto-cleanup" ]]; then
    # Strip "--reenable-auto-cleanup" from args
    set -- "${@:1:$((i - 1))}" "${@:$((i+1)):$((${#} - i))}"
    if ! ${have_failed_img}; then
      echo "Library was not built with failed image support, so passing \`--reenable-auto-cleanup\` is a noop" >&2
    fi
    disable_failed_images=true
  fi
done

if ! ${disable_failed_images}; then
  if ${have_failed_img}; then
    if [[ -n "${preflags:-}" ]]; then
      preflags+=(--disable-auto-cleanup)
    else
      preflags=(--disable-auto-cleanup)
    fi
  fi
fi

# Print useage information if caf is invoked without arguments
if ((${#} == 0)); then
  usage
  exit 1
elif [[ "${1}" == -[vV] || "${1}" == '--version' ]]; then
  echo ""
  echo "OpenCoarrays Coarray Fortran Executable Launcher (cafrun version ${caf_version})"
  echo "Copyright (C) 2015-2020 Sourcery, Inc."
  echo ""
  echo "OpenCoarrays comes with NO WARRANTY, to the extent permitted by law."
  echo "You may redistribute copies of OpenCoarrays under the terms of the"
  echo "BSD 3-Clause License.  For more information about these matters, see"
  echo "the file named LICENSE."
  echo ""
elif [[ "${1}" == -w || "${1}" == --wraps ]]; then
  "${CAFRUN}" --version
elif [[ "${1}" == -h || "${1}" == --help ]]; then
  usage
elif [[ "${1}" == -s || "${1}" == --show ]]; then
  if ((${#} > 4)); then
    mpiexec_args=("${2:-${numproc_flag}}" "${3:-<number_of_images>}")
    if [[ -n "${preflags[*]:-}" ]]; then
      mpiexec_args+=("${preflags[@]}")
    fi
    mpiexec_args+=("${4:-/path/to/coarray_Fortran_program}")
    if [[ -n "${postflags[*]:-}" ]]; then
      mpiexec_args+=("${postflags[@]}")
    fi
    if [[ -n "${*:5:$((${#} - 4))}" ]]; then
      mpiexec_args+=("${@:5:$((${#} - 4))}")
    fi
    echo "${CAFRUN} ${mpiexec_args[*]}"
  else
    mpiexec_args=("${2:-${numproc_flag}}" "${3:-<number_of_images>}")
    if [[ -n "${preflags[*]:-}" ]]; then
      mpiexec_args+=("${preflags[@]}")
    fi
    mpiexec_args+=("${4:-/path/to/coarray_Fortran_program}")
    if [[ -n "${postflags[*]:-}" ]]; then
      mpiexec_args+=("${postflags[@]}")
    fi
    mpiexec_args+=("[arg4 [arg5 [...]]]")
    echo "${CAFRUN} ${mpiexec_args[*]}"
  fi
elif [[ "${1}" == -np || "${1}" == -n ]]; then
  # shellcheck disable=SC1001
  if [[ "${2}" =~ ^[\-0-9]+$ ]] && (( ${2} > 0)) && ((${#} > 2)); then
    mpiexec_args=("${numproc_flag}" "${2}")
    if [[ -n "${preflags[*]:-}" ]]; then
      mpiexec_args+=("${preflags[@]}")
    fi
    mpiexec_args+=("${3}")
    if [[ -n "${postflags[*]:-}" ]]; then
      mpiexec_args+=("${postflags[@]}")
    fi
    if [[ -n "${*:4:$((${#} - 3))}" ]]; then
      mpiexec_args+=("${@:4:$((${#} - 3))}")
    fi

    if "${CAFRUN}" "${mpiexec_args[@]//''/}" ; then
      exit $?
    else
      return_code=$?
      echo "Error: Command:" >&2
      echo "   \`${CAFRUN}" "${mpiexec_args[*]//''/}\`" >&2
      echo "failed to run." >&2
      exit "${return_code}"
    fi
  else
    usage
  fi
else
  usage
fi