1'use strict' 2module.exports = (mode, isDir, portable) => { 3 mode &= 0o7777 4 5 // in portable mode, use the minimum reasonable umask 6 // if this system creates files with 0o664 by default 7 // (as some linux distros do), then we'll write the 8 // archive with 0o644 instead. Also, don't ever create 9 // a file that is not readable/writable by the owner. 10 if (portable) { 11 mode = (mode | 0o600) & ~0o22 12 } 13 14 // if dirs are readable, then they should be listable 15 if (isDir) { 16 if (mode & 0o400) { 17 mode |= 0o100 18 } 19 if (mode & 0o40) { 20 mode |= 0o10 21 } 22 if (mode & 0o4) { 23 mode |= 0o1 24 } 25 } 26 return mode 27} 28