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// only remove the thing if it's a symlink into a specific folder.
// This is a very common use-case of npm's, but not so common elsewhere.
module.exports = gentlyRm
var npm = require("../npm.js")
, log = require("npmlog")
, resolve = require("path").resolve
, dirname = require("path").dirname
, lstat = require("graceful-fs").lstat
, readlink = require("graceful-fs").readlink
, isInside = require("path-is-inside")
, vacuum = require("fs-vacuum")
, rimraf = require("rimraf")
, some = require("async-some")
function gentlyRm (path, gently, cb) {
if (!cb) {
cb = gently
gently = null
}
// never rm the root, prefix, or bin dirs.
// just a safety precaution.
var prefixes = [
npm.dir, npm.root, npm.bin, npm.prefix,
npm.globalDir, npm.globalRoot, npm.globalBin, npm.globalPrefix
]
var resolved = resolve(path)
if (prefixes.indexOf(resolved) !== -1) {
log.verbose("gentlyRm", resolved, "is part of npm and can't be removed")
return cb(new Error("May not delete: "+resolved))
}
var options = {log : log.silly.bind(log, "gentlyRm")}
if (npm.config.get("force") || !gently) options.purge = true
if (!gently) {
log.verbose("gentlyRm", "vacuuming", resolved)
return vacuum(resolved, options, cb)
}
var parent = resolve(gently)
log.verbose("gentlyRm", "verifying that", parent, "is managed by npm")
some(prefixes, isManaged(parent), function (er, matched) {
if (er) return cb(er)
if (!matched) {
log.verbose("gentlyRm", parent, "is not managed by npm")
return clobberFail(resolved, parent, cb)
}
log.silly("gentlyRm", parent, "is managed by npm")
if (isInside(resolved, parent)) {
log.silly("gentlyRm", resolved, "is under", parent)
log.verbose("gentlyRm", "vacuuming", resolved, "up to", parent)
options.base = parent
return vacuum(resolved, options, cb)
}
log.silly("gentlyRm", resolved, "is not under", parent)
log.silly("gentlyRm", "checking to see if", resolved, "is a link")
lstat(resolved, function (er, stat) {
if (er) {
if (er.code === "ENOENT") return cb(null)
return cb(er)
}
if (!stat.isSymbolicLink()) {
log.verbose("gentlyRm", resolved, "is outside", parent, "and not a link")
return clobberFail(resolved, parent, cb)
}
log.silly("gentlyRm", resolved, "is a link")
readlink(resolved, function (er, link) {
if (er) {
if (er.code === "ENOENT") return cb(null)
return cb(er)
}
var source = resolve(dirname(resolved), link)
if (isInside(source, parent)) {
log.silly("gentlyRm", source, "inside", parent)
log.verbose("gentlyRm", "vacuuming", resolved)
return vacuum(resolved, options, cb)
}
log.silly("gentlyRm", "checking to see if", source, "is managed by npm")
some(prefixes, isManaged(source), function (er, matched) {
if (er) return cb(er)
if (matched) {
log.silly("gentlyRm", source, "is under", matched)
log.verbose("gentlyRm", "removing", resolved)
rimraf(resolved, cb)
}
log.verbose("gentlyRm", source, "is not managed by npm")
return clobberFail(path, parent, cb)
})
})
})
})
}
var resolvedPaths = {}
function isManaged (target) {
return predicate
function predicate (path, cb) {
if (!path) {
log.verbose("isManaged", "no path")
return cb(null, false)
}
path = resolve(path)
// if the path has already been memoized, return immediately
var resolved = resolvedPaths[path]
if (resolved) {
var inside = isInside(target, resolved)
log.silly("isManaged", target, inside ? "is" : "is not", "inside", resolved)
return cb(null, inside && path)
}
// otherwise, check the path
lstat(path, function (er, stat) {
if (er) {
if (er.code === "ENOENT") return cb(null, false)
return cb(er)
}
// if it's not a link, cache & test the path itself
if (!stat.isSymbolicLink()) return cacheAndTest(path, path, target, cb)
// otherwise, cache & test the link's source
readlink(path, function (er, source) {
if (er) {
if (er.code === "ENOENT") return cb(null, false)
return cb(er)
}
cacheAndTest(resolve(path, source), path, target, cb)
})
})
}
function cacheAndTest (resolved, source, target, cb) {
resolvedPaths[source] = resolved
var inside = isInside(target, resolved)
log.silly("cacheAndTest", target, inside ? "is" : "is not", "inside", resolved)
cb(null, inside && source)
}
}
function clobberFail (p, g, cb) {
var er = new Error("Refusing to delete: "+p+" not in "+g)
er.code = "EEXIST"
er.path = p
return cb(er)
}
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