Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/galaxy/util/renamed_temporary_file.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 """Safely write file to temporary file and then move file into place.""" |
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2 # Copied from https://stackoverflow.com/a/12007885. |
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3 import os |
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4 import tempfile |
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5 |
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6 |
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7 class RenamedTemporaryFile: |
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8 """ |
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9 A temporary file object which will be renamed to the specified |
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10 path on exit. |
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11 """ |
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12 def __init__(self, final_path, **kwargs): |
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13 """ |
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14 >>> dir = tempfile.mkdtemp() |
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15 >>> with RenamedTemporaryFile(os.path.join(dir, 'test.txt'), mode="w") as out: |
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16 ... _ = out.write('bla') |
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17 """ |
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18 tmpfile_dir = kwargs.pop('dir', None) |
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19 |
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20 # Put temporary file in the same directory as the location for the |
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21 # final file so that an atomic move into place can occur. |
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22 |
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23 if tmpfile_dir is None: |
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24 tmpfile_dir = os.path.dirname(final_path) |
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25 |
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26 self.tmpfile = tempfile.NamedTemporaryFile(dir=tmpfile_dir, delete=False, **kwargs) |
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27 self.final_path = final_path |
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28 |
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29 def __getattr__(self, attr): |
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30 """ |
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31 Delegate attribute access to the underlying temporary file object. |
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32 """ |
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33 return getattr(self.tmpfile, attr) |
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34 |
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35 def __enter__(self): |
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36 self.tmpfile.__enter__() |
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37 return self |
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38 |
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39 def __exit__(self, exc_type, exc_val, exc_tb): |
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40 if exc_type is None: |
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41 self.tmpfile.flush() |
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42 result = self.tmpfile.__exit__(exc_type, exc_val, exc_tb) |
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43 os.rename(self.tmpfile.name, self.final_path) |
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44 else: |
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45 result = self.tmpfile.__exit__(exc_type, exc_val, exc_tb) |
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46 |
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47 return result |