mkinitfs should depend on coreutils
mkinitfs needs coreutils, otherwise it will fail:
(none):/# mkinitfs
==> initramfs: creating /boot/initramfs-grsec
cpio: --no-auto-root Do not automatically prefix input ELFs with ROOT: No such file or directory
cp: can't create '/tmp/mkinitfs.epAegb/lib/modules/4.4.34-0-grsec/': No such file or directory
cp: can't create '/tmp/mkinitfs.epAegb/lib/modules/4.4.34-0-grsec/': No such file or directory
depmod: ERROR: could not open directory /tmp/mkinitfs.epAegb/lib/modules/4.4.34-0-grsec: No such file or directory
depmod: FATAL: could not search modules: No such file or directory
find: /tmp/mkinitfs.epAegb/lib/modules: No such file or directory
modinfo: ERROR: missing module or filename.
(none):/# apk add coreutils
(1/3) Installing libattr (2.4.47-r4)
(2/3) Installing libacl (2.2.52-r2)
(3/3) Installing coreutils (8.25-r0)
Executing busybox-1.25.1-r0.trigger
OK: 311 MiB in 40 packages
(none):/# mkinitfs
==> initramfs: creating /boot/initramfs-grsec
(none):/#
(from redmine: issue id 6487, created on 2016-11-23)