#!/bin/sh

# Copyright(c) 2016 Association of Universities for Research in Astronomy, Inc.

# A post-install script for AstroConda IRAF packages (to update extern.pkg),
# which gets executed automatically when doing "conda install", but can also be
# run by users to restore broken definitions.

script_dir=`dirname "$0"`

st=1
unset name remove flags
while [ -n "$1" ]; do
    case "$1" in
	-h)
            st=0; break
            ;;
        --remove)
            remove=1
            ;;
        -*)
            st=1; break
            ;;
        *)
            if [ -n "$name" ]; then
                st=1
	    else
                st=""; name="$1"
            fi
            ;;
    esac
    shift
done

if [ -n "$st" ]; then
    echo "Usage: `basename "$0"` [--remove] NAME "                 >&2
    echo "  (normally invoked automatically by \"conda install\")" >&2
    echo                                                           >&2
    exit $st
fi

[ -n "$remove" ] && flags="${flags}${flags:+ }--remove"

# If the shell environment isn't configured by "conda install" as expected, try
# falling back to Anaconda's run-time path variables to support user invocation.
if [ -z "$PREFIX" ]; then
    if [ -n "$CONDA_PREFIX" ]; then
        export PREFIX="$CONDA_PREFIX"        # new convention
    elif [ -n "$CONDA_ENV_PATH" ]; then
        export PREFIX="$CONDA_ENV_PATH"      # old convention
    else
        echo "ERROR: conda environment not configured (source activate?)" >&2
        exit 1
    fi
fi
if [ ! -d "$PREFIX" -o ! -w "$PREFIX" ]; then
    echo "ERROR: cannot write to directory $PREFIX" >&2
    exit 1
fi

# Create any new file with the expected permissions:
umask 022

# Both the LSB and MacOS define Python in /usr/bin as standard, avoiding any
# dependence on the state of the installation. This does not always exist on
# some OSs like Ubuntu, however, so try a couple of other known possibilities
# and default to whatever "python" is found in the PATH if even those fail.
for PYTHON in /usr/bin/python /usr/bin/python2 /usr/bin/python3 python; do
    [ -x "$PYTHON" ] && break
done
if [ "$PYTHON" = "python" ]; then
    if ! $PYTHON -c "pass"; then
        echo "ERROR: cannot execute python (for IRAF package $name)" >&2
        exit 1
    fi
fi

# The Python script for updating extern.pkg must be invoked as follows because
# (if directly executable) conda insists on changing its interpreter path to
# one in the env that may not exist, since IRAF packages do not require python
# :-(. The conda build docs also explicitly disallow post-install scripts from
# depending on other packages.

if ! $PYTHON "$script_dir/ac_update_extern_pkg" $flags "$PREFIX" "$name"; then
    echo "ERROR: failed to update extern.pkg for $name" >&2
    exit 1
fi