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const { dirname, resolve } = require('path')
const fileURLToPath = require('./file-url-to-path/index.js')
const fs = require('../fs.js')
// given a path, find the owner of the nearest parent
const find = async (path) => {
// if we have no getuid, permissions are irrelevant on this platform
if (!process.getuid) {
return {}
}
// fs methods accept URL objects with a scheme of file: so we need to unwrap
// those into an actual path string before we can resolve it
const resolved = path != null && path.href && path.origin
? resolve(fileURLToPath(path))
: resolve(path)
let stat
try {
stat = await fs.lstat(resolved)
} finally {
// if we got a stat, return its contents
if (stat) {
return { uid: stat.uid, gid: stat.gid }
}
// try the parent directory
if (resolved !== dirname(resolved)) {
return find(dirname(resolved))
}
// no more parents, never got a stat, just return an empty object
return {}
}
}
// given a path, uid, and gid update the ownership of the path if necessary
const update = async (path, uid, gid) => {
// nothing to update, just exit
if (uid === undefined && gid === undefined) {
return
}
try {
// see if the permissions are already the same, if they are we don't
// need to do anything, so return early
const stat = await fs.stat(path)
if (uid === stat.uid && gid === stat.gid) {
return
}
} catch (err) {}
try {
await fs.chown(path, uid, gid)
} catch (err) {}
}
// accepts a `path` and the `owner` property of an options object and normalizes
// it into an object with numerical `uid` and `gid`
const validate = async (path, input) => {
let uid
let gid
if (typeof input === 'string' || typeof input === 'number') {
uid = input
gid = input
} else if (input && typeof input === 'object') {
uid = input.uid
gid = input.gid
}
if (uid === 'inherit' || gid === 'inherit') {
const owner = await find(path)
if (uid === 'inherit') {
uid = owner.uid
}
if (gid === 'inherit') {
gid = owner.gid
}
}
return { uid, gid }
}
module.exports = {
find,
update,
validate,
}
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