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https://github.com/tahoe-lafs/tahoe-lafs.git
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31 lines
858 B
Python
31 lines
858 B
Python
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#!/usr/bin/env python
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from allmydata.util import fileutil
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import re, shutil, sys
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R=re.compile("^#! */usr/bin/python *$")
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for fname in sys.argv[1:]:
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inf = open(fname, "rU")
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rntf = fileutil.ReopenableNamedTemporaryFile()
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outf = open(rntf.name, "w")
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first = True
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for l in inf:
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if first and R.search(l):
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outf.write("#!/usr/bin/env python\n")
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else:
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outf.write(l)
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first = False
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outf.close()
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try:
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shutil.move(rntf.name, fname)
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except EnvironmentError:
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# Couldn't atomically overwrite, so just hope that this process doesn't die
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# and the target file doesn't get recreated in between the following two
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# operations:
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shutil.move(fname, fname + ".bak")
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shutil.move(rntf.name, fname)
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fileutil.remove_if_possible(fname + ".bak")
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