1 files changed, 44 insertions, 0 deletions
diff --git a/deps/npm/node_modules/bin-links/lib/fix-bin.js b/deps/npm/node_modules/bin-links/lib/fix-bin.js
new file mode 100644
index 0000000000..a87a4d6945
--- /dev/null
+++ b/deps/npm/node_modules/bin-links/lib/fix-bin.js
@@ -0,0 +1,44 @@
+// make sure that bins are executable, and that they don't have
+// windows line-endings on the hashbang line.
+const fs = require('fs')
+const { promisify } = require('util')
+
+const execMode = 0o777 & (~process.umask())
+
+const writeFileAtomic = require('write-file-atomic')
+const open = promisify(fs.open)
+const close = promisify(fs.close)
+const read = promisify(fs.read)
+const chmod = promisify(fs.chmod)
+const readFile = promisify(fs.readFile)
+
+const isWindowsHashBang = buf =>
+  buf[0] === '#'.charCodeAt(0) &&
+  buf[1] === '!'.charCodeAt(0) &&
+  /^#![^\n]+\r\n/.test(buf.toString())
+
+const isWindowsHashbangFile = file => {
+  const FALSE = () => false
+  return open(file, 'r').then(fd => {
+    const buf = Buffer.alloc(2048)
+    return read(fd, buf, 0, 2048, 0)
+      .then(
+        () => {
+          const isWHB = isWindowsHashBang(buf)
+          return close(fd).then(() => isWHB, () => isWHB)
+        },
+        // don't leak FD if read() fails
+        () => close(fd).then(FALSE, FALSE)
+      )
+  }, FALSE)
+}
+
+const dos2Unix = file =>
+  readFile(file, 'utf8').then(content =>
+    writeFileAtomic(file, content.replace(/^(#![^\n]+)\r\n/, '$1\n')))
+
+const fixBin = file => chmod(file, execMode)
+  .then(() => isWindowsHashbangFile(file))
+  .then(isWHB => isWHB ? dos2Unix(file) : null)
+
+module.exports = fixBin