bug#25620: mkdir ignores set-group-id bit in mode argument

[Alexander Syvak]

Hi!

I have a directory structure

address@hidden:~/address@hidden/test_dir$ ll
total 20
drwxrwsr-x 5 as root 4096 лют  4 20:26 ./
drwsr-sr-x 7 as as   4096 лют  4 19:58 ../
drwxrwsr-x 3 as root 4096 лют  4 20:23 td/
drwxrwsr-x 3 as root 4096 лют  4 20:27 test/

I have executed

mkdir -p test/test --mode=7777

address@hidden:~/address@hidden/test_dir$ ll test
total 12
drwxrwsr-x 3 as root 4096 лют  4 20:27 ./
drwxrwsr-x 5 as root 4096 лют  4 20:26 ../
drwsrw*x*rwt 2 as root 4096 лют  4 20:27 test/

As you can see the set-group-id bit is not set in directory test/test.

Author is David MacKenzie
Version of GNU coreutils is 8.25

umask was 0002.