'use strict' module.exports = (mode, isDir, portable) => { mode &= 0o7777 // in portable mode, use the minimum reasonable umask // if this system creates files with 0o664 by default // (as some linux distros do), then we'll write the // archive with 0o644 instead. Also, don't ever create // a file that is not readable/writable by the owner. if (portable) { mode = (mode | 0o600) & ~0o22 } // if dirs are readable, then they should be listable if (isDir) { if (mode & 0o400) { mode |= 0o100 } if (mode & 0o40) { mode |= 0o10 } if (mode & 0o4) { mode |= 0o1 } } return mode }