ehooks_check.sh

#!/bin/bash

color_norm=$(tput sgr0)
color_bold=$(tput bold)
color_blue=$(tput setaf 4)
color_cyan=$(tput setaf 6)

[[ -z $1 || $# -gt 1 ]] && set -- "-h"

## Manual.
case $1 in
	-c|--check)
		true
		;;
	-r|--reset)
		reset="yes"
		;;
	*)
		echo "${color_blue}${color_bold}NAME${color_norm}"
		echo "	ehooks - generate emerge command needed to apply ebuild hooks changes"
		echo
		echo "${color_blue}${color_bold}SYNOPSIS${color_norm}"
		echo "	${color_blue}${color_bold}ehooks${color_norm} [${color_cyan}OPTION${color_norm}]"
		echo
		echo "${color_blue}${color_bold}DESCRIPTION${color_norm}"
		echo "	It looks for ebuild hooks changes and generates emerge command needed to apply the changes."
		echo "	/usr/bin/${color_blue}${color_bold}ehooks${color_norm} is a symlink to /var/lib/layman/unity-gentoo/ehooks_check.sh script."
		echo
		echo "${color_blue}${color_bold}OPTIONS${color_norm}"
		echo "	${color_blue}${color_bold}-c${color_norm}, ${color_blue}${color_bold}--check${color_norm}"
		echo "		Generate emerge command when changes found."
		echo
		echo "	${color_blue}${color_bold}-r${color_norm}, ${color_blue}${color_bold}--reset${color_norm}"
		echo "		Set changes as applied (reset modification time)."
		echo
		exit 1
esac

count=0

## Progress indicator.
indicator() {
	local -a arr=( "|" "/" "-" "\\" )

	[[ ${count} -eq 4 ]] && count=0
	printf "\b\b %s" "${arr[${count}]}"
	count=$((count + 1))
}

printf "%s  " "Looking for ebuild hooks changes"

indicator

repo_root="$(/usr/bin/portageq get_repo_path / unity-gentoo)"
wcard="*/*/"

arr=( "nzero" )

## Get all ebuild hooks (sub)directories.
while [[ -n ${arr[@]} ]]; do
	indicator

	prev_shopt=$(shopt -p nullglob)
	shopt -s nullglob
	arr=( "${repo_root}"/profiles/ehooks/${wcard} )
	${prev_shopt}

	ehk+=( "${arr[@]}" )
	wcard+="*/"
done

sys_db="/var/db/pkg/"

EHOOK_UPDATE=()

for x in "${ehk[@]}"; do
	indicator

	## Get ${CATEGORY}/{${P}-${PR},${P},${P%.*},${P%.*.*},${PN}} from ebuild hook's path.
	m=${x%%/files/*}
	m=${m%/}
	m=${m#*/ehooks/}
	## Get ${SLOT}.
	[[ ${m} == *":"+([0-9.]) ]] && slot="${m#*:}" || slot=""
	m="${m%:*}"

	## Get installed packages affected by the ebuild hook.
	prev_shopt=$(shopt -p nullglob) ## don't use extglob
	shopt -s nullglob
	[[ -d ${sys_db}${m} ]] && pkg=( "${sys_db}${m}" ) || pkg=( "${sys_db}${m}"{-[0-9],.[0-9],-r[0-9]}*/ )
	${prev_shopt}

	for n in "${pkg[@]}"; do
		## Try another package if modification time is newer or equal than the ebuild hook's (sub)directory time.
		sys_date=$(date -r "${n}" "+%s")
		[[ ${sys_date} -ge $(date -r "${x}" "+%s") ]] && continue

		## Try another package if slots differ.
		[[ -z ${slot} ]] || fgrep -qsx "${slot}" "${n}/SLOT" || continue

		## Try another package if ehook_require USE-flag is not declared.
		req=$(egrep -hos -m 1 "ehook_require\s[A-Za-z0-9+_@-]+" "${x%%/files/*}/"*.ehook | head -1)
		[[ -z ${req} ]] || portageq has_version / unity-extra/ehooks["${req/ehook_require }"] || continue

		## Set ebuild hook's modification time equal to package's time when --reset option given.
		[[ -n ${reset} ]] && touch -m -t $(date -d @"${sys_date}" +%Y%m%d%H%M.%S) "${x}" 2>/dev/null && reset="applied" && continue
		## Get ownership of file when 'touch: cannot touch "${x}": Permission denied' and quit.
		[[ -n ${reset} ]] && reset=$(stat -c "%U:%G" "${x}") && break 2

		## Get =${CATEGORY}/${PF} from package's ${sys_db} path.
		n="${n%/}"
		n="${n#${sys_db}}"
		EHOOK_UPDATE+=( "=${n}" )
	done
done

printf "\b\b%s\n\n" "... done!"

einfo() {
	local color_green=$(tput setaf 2)

	echo " ${color_green}${color_bold}*${color_norm} $*"
}

ewarn() {
	local color_yellow=$(tput setaf 3)

	echo " ${color_yellow}${color_bold}*${color_norm} $*"
}

if [[ -n ${EHOOK_UPDATE[@]} ]]; then
	# Remove duplicates.
	EHOOK_UPDATE=( $(printf "%s\n" "${EHOOK_UPDATE[@]}" | sort -u) )

	ewarn "Rebuild the packages affected by the ebuild hooks changes:"
	ewarn "emerge -1 ${EHOOK_UPDATE[@]}"
else
	case ${reset} in
		"")
			einfo "No rebuild needed"
			;;
		applied)
			einfo "Reset applied"
			;;
		yes)
			einfo "Reset not needed"
			;;
		*)
			ewarn "Permission denied to apply reset (ownership ${reset})"
			;;
	esac
fi
echo