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:
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proc
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self
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root
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usr
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lib
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node_modules
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npm
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node_modules
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infer-owner
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files >> //proc/self/root/usr/lib/node_modules/npm/node_modules/infer-owner/index.js
const cache = new Map() const fs = require('fs') const { dirname, resolve } = require('path') const lstat = path => new Promise((res, rej) => fs.lstat(path, (er, st) => er ? rej(er) : res(st))) const inferOwner = path => { path = resolve(path) if (cache.has(path)) return Promise.resolve(cache.get(path)) const statThen = st => { const { uid, gid } = st cache.set(path, { uid, gid }) return { uid, gid } } const parent = dirname(path) const parentTrap = parent === path ? null : er => { return inferOwner(parent).then((owner) => { cache.set(path, owner) return owner }) } return lstat(path).then(statThen, parentTrap) } const inferOwnerSync = path => { path = resolve(path) if (cache.has(path)) return cache.get(path) const parent = dirname(path) // avoid obscuring call site by re-throwing // "catch" the error by returning from a finally, // only if we're not at the root, and the parent call works. let threw = true try { const st = fs.lstatSync(path) threw = false const { uid, gid } = st cache.set(path, { uid, gid }) return { uid, gid } } finally { if (threw && parent !== path) { const owner = inferOwnerSync(parent) cache.set(path, owner) return owner // eslint-disable-line no-unsafe-finally } } } const inflight = new Map() module.exports = path => { path = resolve(path) if (inflight.has(path)) return Promise.resolve(inflight.get(path)) const p = inferOwner(path).then(owner => { inflight.delete(path) return owner }) inflight.set(path, p) return p } module.exports.sync = inferOwnerSync module.exports.clearCache = () => { cache.clear() inflight.clear() }
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