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#!/bin/bash -e

NAME=$(basename "$0")

OPTIONS=(
	"mode"
	"xml-src"
	"url"
)

usage() {
	echo "Usage: ${NAME}$(printf " --%s=..." "${OPTIONS[@]}" )" 1>&2
	exit 3
}

dohelp() {
	echo "${NAME} TODO" 1>&2
	exit 0
}

die() {
	echo "$*" 1>&2
	exit 2
}

main() {
	SITEDIR=/var/www/mirrorstats.gentoo.org
	REPODIR=${SITEDIR}/gentoo-mirrorstats/
	MODEDIR=${REPODIR}/${MODE}_mirrors/
	VARDIR=${SITEDIR}/var/${MODE}
	HTDOCS=${SITEDIR}/htdocs/${MODE}
	MIRMON=$(readlink -f "${SITEDIR}"/mirmon/mirmon)
	CONFFILE=$(readlink -f "${MODEDIR}"/mirmon.conf)
	VAR_GMIRRORS=${VARDIR}/g.mirrors
	EXTRA_MIRRORS=${MODEDIR}/g.mirrors.extra

	# Grab mirrors from the web
	mkdir -p "${VARDIR}" "${HTDOCS}" || die "Failed to mkdir"
	"${REPODIR}/get-mirrors-from-${XML_SRC}-xml.rb" > "${VAR_GMIRRORS}".tmp || die "Unable to fetch mirror list"

	[[ -e "${EXTRA_MIRRORS}" ]] && cat "${EXTRA_MIRRORS}" >>"${VAR_GMIRRORS}".tmp

	# Atomic rotate into place
	mv -f "${VAR_GMIRRORS}"{.tmp,} || die "Failed to set mirror list"

	# fatal if the state file is NOT present.
	if [[ ! -e ${VARDIR}/mirmon.state ]]; then
		touch "${VARDIR}/mirmon.state" || die "Could not create state file"
	else
		test -w "${VARDIR}/mirmon.state" || die "Cannot write state file!"
	fi

	# run mirmon
	/usr/bin/perl "${MIRMON}" -c "${CONFFILE}" -q -get update || die "mirmon failed: $?"

	# Set up a nice link to our mirror page directly:
	sed \
	    -e "s#mirrors</H2>#<a href=\"${URL}\">mirrors</a></H2>#" \
	    >"${HTDOCS}"/index.html.tmp <"${HTDOCS}"/index-wip.html \
		|| die "Failed to fix URLs(sed)"
	mv -f "${HTDOCS}"/index.html{.tmp,} || die "Failed to fix URLs(mv)"

	# Generate a json file containing the state of each mirror
	"${REPODIR}"/generate-json.py \
		"${VARDIR}"/mirmon.state \
		>"${HTDOCS}"/state.json.tmp \
	|| die "Failed to generate JSON (py)"
	mv -f "${HTDOCS}"/state.json{.tmp,} || die "Failed to generate JSON (mv)"

	# Done
	exit 0
}

opts=$(getopt \
	--longoptions "$(printf "%s:," "${OPTIONS[@]}" )" \
	--name "$(basename "$0")" \
	--options "" \
	-- "$@"
)

eval set --$opts

MODE=''
XML_SRC=''
URL=''
HELP=0
INVALID=0

while [[ $# -gt 0 ]]; do
    case "$1" in
        --mode)
            MODE=$2
            shift 2
            ;;

        --xml-src)
            XML_SRC=$2
            shift 2
            ;;

        --url)
            URL=$2
            shift 2
            ;;
		--help)
			HELP=1
			break
			;;
		--)
			# End of options
			break
			;;
        *)
			INVALID=1
            break
            ;;
    esac
done

# Validations
MODE_INPUTS=(
	distfiles
	rsync
	snapshots
	experimental
	releases
)
MODE_VALID=0
for m in "${MODE_INPUTS[@]}"; do
	[[ "$m" == "$MODE" ]] && MODE_VALID=1
done
[[ $MODE_VALID -eq 1 ]] || MODE=''

XML_SRC_INPUTS=(
	distfiles
	rsync
)
XML_SRC_VALID=0
for m in "${XML_SRC_INPUTS[@]}"; do
	[[ "$m" == "$XML_SRC" ]] && XML_SRC_VALID=1
done
[[ $XML_SRC_VALID -eq 1 ]] || XML_SRC=''

[[ -z "$MODE" ]] && die "--mode must be one of: ${MODE_INPUTS[*]}"
[[ -z "$XML_SRC" ]] && die "--xml-src must be one of: ${XML_SRC_INPUTS[*]}"
[[ -z "$URL" ]] && die "--url unset"

[[ $INVALID -eq 1 ]] && usage
[[ $HELP -eq 1 ]] && dohelp

main