8000 Always write the cache (unless cache_dir is /dev/null) by gvanrossum · Pull Request #3133 · python/mypy · GitHub
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Always write the cache (unless cache_dir is /dev/null) #3133

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Merged
merged 6 commits into from
Apr 19, 2017
Merged

Always write the cache (unless cache_dir is /dev/null) #3133

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b3578a5
Always write the cache (unless cache_dir is /dev/null)
Apr 4, 2017
3f4706c
Respond to review; move get_stat(path) up and be more robust
Apr 5, 2017
1338bca
Fix format string
Apr 19, 2017
49a6665
Merge branch 'master' into always-write-cache
Apr 19, 2017
114be68
Handle a rare race condition with makedirs().
Apr 19, 2017
c836125
Better fix for makedirs() race
Apr 19, 2017
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Respond to review; move get_stat(path) up and be more robust
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Guido van Rossum committed Apr 5, 2017
commit 3f4706cfee494bb212fb83a32ede2ab3b41e5463
21 changes: 14 additions & 7 deletions mypy/build.py
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Original file line number Diff line number Diff line change
Expand Up @@ -876,6 +876,20 @@ def write_cache(id: str, path: str, tree: MypyFile,
data_str = json.dumps(data, sort_keys=True)
interface_hash = compute_hash(data_str)

# Obtain and set up metadata
try:
st = manager.get_stat(path)
except OSError as err:
manager.log("Cannot get stat for {}: %s".format(path, err))
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Something is wrong with formatting here, this does not fail, but %s is never replaced (at least in Python 3.4 I just tried).

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Good eye, I am still not in the habit of using {} for format()...

# Remove apparently-invalid cache files.
for filename in [data_json, meta_json]:
try:
os.remove(filename)
except OSError:
pass
# Still return the interface hash we computed.
return interface_hash

# Write data cache file, if applicable
if old_interface_hash == interface_hash:
# If the interface is unchanged, the cached data is guaranteed
Expand All @@ -890,13 +904,6 @@ def write_cache(id: str, path: str, tree: MypyFile,
os.replace(data_json_tmp, data_json)
manager.trace("Interface for {} has changed".format(id))
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Shouldn't the replace in :890 be only done if there's no OSError in :895?


# Obtain and set up metadata
try:
st = manager.get_stat(path)
except OSError:
manager.log("Cannot write {}".format(path))
return interface_hash

mtime = st.st_mtime
size = st.st_size
options = manager.options.clone_for_module(id)
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