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fix: fix mtime precision on some filesystems #88
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,55 @@ | ||
'use strict'; | ||
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const cacheSymbol = Symbol(); | ||
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function probe(file, fs, callback) { | ||
const cachedPrecision = fs[cacheSymbol]; | ||
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if (cachedPrecision) { | ||
return fs.stat(file, (err, stat) => { | ||
/* istanbul ignore if */ | ||
if (err) { | ||
return callback(err); | ||
} | ||
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callback(null, stat.mtime, cachedPrecision); | ||
}); | ||
} | ||
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// Set mtime by ceiling Date.now() to seconds + 5ms so that it's "not on the second" | ||
const mtime = new Date((Math.ceil(Date.now() / 1000) * 1000) + 5); | ||
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fs.utimes(file, mtime, mtime, (err) => { | ||
/* istanbul ignore if */ | ||
if (err) { | ||
return callback(err); | ||
} | ||
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fs.stat(file, (err, stat) => { | ||
/* istanbul ignore if */ | ||
if (err) { | ||
return callback(err); | ||
} | ||
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const precision = stat.mtime.getTime() % 1000 === 0 ? 's' : 'ms'; | ||
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// Cache the precision in a non-enumerable way | ||
Object.defineProperty(fs, cacheSymbol, { value: precision }); | ||
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callback(null, stat.mtime, precision); | ||
}); | ||
}); | ||
} | ||
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function getMtime(precision) { | ||
let now = Date.now(); | ||
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if (precision === 's') { | ||
now = Math.ceil(now / 1000) * 1000; | ||
} | ||
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return new Date(now); | ||
} | ||
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module.exports.probe = probe; | ||
module.exports.getMtime = getMtime; |
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The fs might be either ceiling, rounding or flooring.
ceil
is preferred because of theisStaleLock
check, where we are using a Date.now. This way, the mtime is always set a little bit in the future and theisStaleLock
will always behave correctly.