#!/bin/sh

# Names of the script(s) to be updated in the same directory this is run from:
scripts="update_extern_pkg"

# Work in the directory where this script and those to be updated live:
cd `dirname $0` || exit 1  # (should never fail if this script can be executed)

# Put temporary copies in a tmp/ directory in the conda environment or /tmp/:
tmp="$PREFIX/tmp"
if [ -d "$tmp" ]; then
    remove_tmp=0
else
    if ! mkdir "$tmp"; then
	echo "failed to create $tmp" >&2
        exit 1
    fi
    remove_tmp=1
fi

# Update each named script in turn:
for script in $scripts; do

    if [ ! -r "$script" ]; then
	echo "no such script: $script" >&2
        exit 1	
    fi

    tmpscript="$tmp/$script"

    if ! sed -e 's|#\!.*/python$|#\!/usr/bin/python|' "$script" > "$tmpscript"
    then
        echo "cannot write $tmpscript" >&2
        exit 1
    fi

    chmod 755 "$tmpscript"

    if ! mv -f "$tmpscript" "$script"; then
        echo "failed to replace $script" >&2
        exit 1
    fi

done

# Clean up:
[ $remove_tmp == 1 ] && rmdir "$tmp"