Second attempt at debugging issue #60

issue-60b.py

#! /usr/bin/env python

# Author: Victor Terron (c) 2015
# Email: `echo vt2rron1iaa32s | tr 132 @.e`
# License: GNU GPLv3

""" Mosaic the first ten FITS files using Montage, then the first twenty, then
the first thirty, et cetera. That is: the number of mosaicked images increases
in steps of ten, stopping as soon as an error, if any, is encountered."""

from __future__ import division
from __future__ import print_function
from __future__ import absolute_import
from __future__ import unicode_literals

import atexit
import os
import subprocess
import sys
import tempfile

if __name__ == "__main__":

    if len(sys.argv) == 1:
        msg = "usage: {0} IMAGE...".format(sys.argv[0])
        sys.exit(msg)

    img_paths = sys.argv[1:]
    size = len(img_paths)

    fd, output_image = tempfile.mkstemp(suffix = '.fits')
    atexit.register(os.unlink, output_image)
    os.close(fd)

    for n in range(10, size + 1, 10):
        if n > size:
            n = size

        images = img_paths[:n]
        cmd = ['lemon', 'mosaic'] + images + [output_image, '--overwrite']
        try:
            msg = "Mosaicking {0} images (last: {1})..."
            args = len(images), os.path.basename(images[-1])
            print(msg.format(*args), end='')
            sys.stdout.flush()
            with open(os.devnull, 'w') as fd:
                subprocess.check_call(cmd, stdout=fd, stderr=fd)
            print(" OK")

        except subprocess.CalledProcessError:
            sys.exit(" ERROR")