Here is what I get after running the commands. 33G is in the directory /
/tmp # add-pkg coreutils
fetch http://dl-cdn.alpinelinux.org/alpine/v3.9/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.9/community/x86_64/APKINDEX.tar.gz
(1/3) Installing libattr (2.4.47-r7)
(2/3) Installing libacl (2.2.52-r5)
(3/3) Installing coreutils (8.30-r0)
Executing busybox-1.29.3-r10.trigger
Executing glibc-ldconfig-trigger-1.0-r0.trigger
OK: 75 MiB in 123 packages
/tmp # du -h -d1 --exclude /storage --exclude /proc --exclude /sys /
6.4M /bin
0 /dev
2.5M /etc
0 /home
5.7M /lib
0 /media
0 /mnt
139M /opt
4.0K /root
292K /run
592K /sbin
0 /srv
33G /tmp
80M /usr
36K /var
4.0K /lib64
84K /libexec
36K /defaults
68M /config
33G /
/tmp #