50 lines
1.3 KiB
Python
50 lines
1.3 KiB
Python
"""
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Helpers for checking for an interacting with external dependencies. These are
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things that Elodie requires, but aren't installed automatically for the user.
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"""
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import os
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import sys
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from distutils.spawn import find_executable
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#: Error to print when exiftool can't be found.
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EXIFTOOL_ERROR = u"""
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It looks like you don't have exiftool installed, which Elodie requires.
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Please take a look at the installation steps in the readme:
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https://github.com/jmathai/elodie#install-everything-you-need
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""".lstrip()
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def get_exiftool():
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"""Get path to executable exiftool binary.
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We wrap this since we call it in a few places and we do a fallback.
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:returns: str or None
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"""
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path = find_executable('exiftool')
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# If exiftool wasn't found we try to brute force the homebrew location
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if path is None:
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path = '/usr/local/bin/exiftool'
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if not os.path.isfile(path) or not os.access(path, os.X_OK):
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return None
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return path
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def verify_dependencies():
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"""Verify that external dependencies are installed.
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Prints a message to stderr and returns False if any dependencies are
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missing.
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:returns: bool
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"""
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exiftool = get_exiftool()
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if exiftool is None:
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print >>sys.stderr, EXIFTOOL_ERROR
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return False
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return True
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