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#!/usr/bin/env python3.5
from subprocess import run
from time import sleep
def redo_ifchange(dependency):
run(['redo-ifchange', dependency])
with open('source', 'w') as f:
f.write('foo')
redo_ifchange('target')
with open('target', 'r') as f:
target_contents_1 = f.read()
sleep(1)
with open('source', 'w') as f:
f.write('bar')
redo_ifchange('target')
with open('target', 'r') as f:
target_contents_2 = f.read()
if target_contents_1 == target_contents_2:
exit(1)
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