#!/bin/sh

# Requires: qatom(1) from portage-utils and xargs(1) from findutils

for path in /var/db/pkg/*/[!-]*/NEEDED; do
	path=${path%/NEEDED}
	if read -r slot < "$path/SLOT"; then
		printf '%s:%s\n' "${path#/var/db/pkg/}" "$slot"
	else
		printf >&2 'Failed to read SLOT for %s\n' "$contents"
	fi
done \
| xargs -rd '\n' qatom -F '%{CATEGORY}/%{PN}:%[SLOT]' \
| xargs -ord '\n' emerge -1 "$@"