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init: fix tmpfs install

during tmpfs install, some package scripts and triggers may
require access to /dev, /proc or /sys. make sure those are
bind mounted to have them available. they are later on move
mounted to the new root.

--- a/initramfs-init.in

+++ b/initramfs-init.in

@@ -773,11 +773,16 @@

 	apkflags="$apkflags --clean-protected"

 	[ -n "$ovlfiles" ] && apkflags="$apkflags --overlay-from-stdin"

 fi

+mkdir -p $sysroot/sys $sysroot/proc $sysroot/dev

+mount -o bind /sys $sysroot/sys

+mount -o bind /proc $sysroot/proc

+mount -o bind /dev $sysroot/dev

 if [ -n "$ovlfiles" ]; then

 	apk add --root $sysroot $repo_opt $apkflags $pkgs <$ovlfiles

 else

 	apk add --root $sysroot $repo_opt $apkflags $pkgs

 fi

+umount $sysroot/sys $sysroot/proc $sysroot/dev

 eend $?

 # unmount ovl mount if needed