#!/bin/sh

# If using normal root, avoid changing anything.
if [ -z "$RPM_BUILD_ROOT" ] || [ "$RPM_BUILD_ROOT" = "/" ]; then
	exit 0
fi

STRIP=${1:-strip}
NCPUS=${RPM_BUILD_NCPUS:-1}

# 32 was chosen as a compromise between reducing the overhead of starting new
# processes and distributing the work load evenly over as much processors as
# possible
MAX_ARGS=32

case `uname -a` in
Darwin*) exit 0 ;;
*) ;;
esac

# Below is the explanation of commands in the order of their appearance
# Ignore /usr/lib/debug entries
# Ignore all go(guile objects & golang) files
# Consider files with only single link
# Run the file command to find relevant non-stripped binaries, with bundle size of 32
# Ignore all 'no machine' files
# Only operate on non-stripped binaries

strip_elf_binaries()
{
  local nlinks="${1}"
  local nprocs="${2}"

  find "$RPM_BUILD_ROOT" -type f \
    ! -regex "${RPM_BUILD_ROOT}/*usr/lib/debug.*" \
    ! -name "*.go" -links "${nlinks}" -print0 | \
    xargs -0 -r -P${nprocs} -n${MAX_ARGS} sh -c "file \"\$@\" | \
    sed -n -e 's/^\(.*\):[ 	]*ELF.*, not stripped.*/\1/p' | \
    grep -v 'no machine' | \
    xargs -I\{\} $STRIP -g \{\}" ARG0
}

# strip all binaries with single link
strip_elf_binaries "1" "${NCPUS}"

# strip all binaries with more than 1 link
strip_elf_binaries "+1" "1"