diff options
Diffstat (limited to 'deps/npm/lib/utils/link.js')
| -rw-r--r-- | deps/npm/lib/utils/link.js | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/deps/npm/lib/utils/link.js b/deps/npm/lib/utils/link.js index 1091f46833c..d0492e076fd 100644 --- a/deps/npm/lib/utils/link.js +++ b/deps/npm/lib/utils/link.js @@ -25,6 +25,24 @@ function linkIfExists (from, to, gently, cb) { }) } +function resolveIfSymlink (maybeSymlinkPath, cb) { + fs.lstat(maybeSymlinkPath, function (err, stat) { + if (err) return cb.apply(this, arguments) + if (!stat.isSymbolicLink()) return cb(null, maybeSymlinkPath) + fs.readlink(maybeSymlinkPath, cb) + }) +} + +function ensureFromIsNotSource (from, to, cb) { + resolveIfSymlink(from, function (err, fromDestination) { + if (err) return cb.apply(this, arguments) + if (path.resolve(path.dirname(from), fromDestination) === path.resolve(to)) { + return cb(new Error('Link target resolves to the same directory as link source: ' + to)) + } + cb.apply(this, arguments) + }) +} + function link (from, to, gently, abs, cb) { if (typeof cb !== 'function') { cb = abs @@ -48,6 +66,7 @@ function link (from, to, gently, abs, cb) { chain( [ + [ensureFromIsNotSource, from, to], [fs, 'stat', from], [rm, to, gently], [mkdir, path.dirname(to)], |