Gentoo profile explorer (mainly for learning purpose)

profile-explorer.sh

#!/bin/bash

# TODO: short desc
# DEPS: portageq, realpath (portage, coreutils)

TMPFOUNDPACKAGES=".found-packages"
EXPLOREDPACKAGES="explored-packages"

# recursive function exploring files of inherited profiles
# $1 = current profile from which to start (important as parent contain relative path)
# $2 = inherited profile to explore (content of parent file)
function explore {
	if [ "$#" -lt "1" ] || [ "$#" -gt "2" ]; then
		echo "[-] Error, wrong number of arguments passed to explore"
		exit
	fi

	local cur="${1}"

	if [ "$#" -eq "2" ]; then
		cur="${cur}/${2}"
	fi

	cur="$(realpath ${cur})"

	# Get packages files
	if [ -e "${cur}/packages" ]; then
		echo "${cur}/packages" >> "$TMPFOUNDPACKAGES"
		echo >> "$EXPLOREDPACKAGES"
		echo "${cur}/packages" >> "$EXPLOREDPACKAGES"
		cat "${cur}/packages" >> "$EXPLOREDPACKAGES"
	fi

	# TODO: might be directories in EAPI=7
	# package.mask
 	# package.use
	# use.*
	# package.use.*
	# package.mask
	# package.use
	# use.*
	# package.use.*

	if [ -e "${cur}/parent" ]; then
		while read -r line || [[ -n "${line}" ]]; do
			explore "${cur}" "${line}"
		done < "${cur}/parent"
	fi
}

function report {
	echo "[+] EROOT     : ${EROOT}"
	echo "[+] PORTDIR   : ${PORTDIR}"
	echo "[+] CURPROFILE: ${PROFILEDIR#${PORTDIR}/profiles/}"
	echo "[+] EAPI      : ${EAPI}"

	echo
	if [ -e "$TMPFOUNDPACKAGES" ]; then
		echo "[+] packages (@system)"
		echo "$(<$TMPFOUNDPACKAGES)"
	else
		echo "[-] No packages file found, which means NO @SYSTEM SET"
	fi
}

function clean {
	rm -f \
		$TMPFOUNDPACKAGES \
		$EXPLOREDPACKAGES
}

EROOT="$(portageq envvar EROOT)"
PORTDIR="$(portageq get_repo_path ${EROOT} gentoo)"

if [ "$#" -eq "1" ]; then
	# TODO: check if arg begins with '/' to support both abspath and profile name
	PROFILEDIR="$(realpath ${PORTDIR}/profiles/${1})"
else
	PROFILEDIR="$(realpath ${EROOT}/etc/portage/make.profile)"
fi

EAPI="0"
if [ -e "${PROFILEDIR}/eapi" ]
then
	EAPI=$(<"${PROFILEDIR}/eapi")
fi

# TODO:
# Deprecated file : print reason + recommended new profile

clean
explore "${PROFILEDIR}"
report