#!/bin/bash

# Run this script via cronjob to update your metadata mirror

METADATA_MIRROR_DIR=/path/to/your/mirror/dir

# METADATA_MIRROR_DIR must contain:
#  * a folder $overlay/ for each overlay you intent to mirror.
#  * a folder cache/ to store the cache of all overlays.
#    (so it is not mixed with the cache of your system portage-trees)
# METADATA_MIRROR_DIR/$overlay/ must contain:
#  * a file etc/make.conf with following contents:
#    PORTDIR=/your/portage/directory
#    PORTDIR_OVERLAY=/path/to/your/mirror/dir/$overlay/repo
#    FEATURES="${FEATURES} userpriv userfetch usersandbox usersync metadata-transfer"
#  * a directory repo/ containing the checked out repository you want to create metadata from.
# For speed reasons it is advisable to have a file etc/portage/modules containing:
#    portdbapi.auxdbmodule = portage.cache.sqlite.database

die() {
	echo "USAGE: $0 <overlay>" 1>&2
	echo "ERROR: $@" 1>&2
	exit 255
}

[[ "$1" ]] || die 'overlay'
overlay="$1" ; shift

if [ -e "$METADATA_MIRROR_DIR/$overlay/repo/.svn" ] ; then
	type=svn
elif [ -e "$METADATA_MIRROR_DIR/$overlay/repo/.git" ] ; then
	type=git
else
	die "Unable to determine overlay type for $overlay"
fi

cd $METADATA_MIRROR_DIR/$overlay/repo || cd "failed to cd to $METADATA_MIRROR_DIR/$overlay/repo"

case "$type" in
	svn)
		svn cleanup && svn update --force --config-option=config:miscellany:use-commit-times=yes || die 'svn update failed'
		;;
	git)
		git pull || die 'git update failed'
		/usr/local/bin/git-set-file-times || die 'setting file times failed'
		;;
	*)
		die "Unsupported overlay type '$type' for $overlay"
esac

exec egencache --config-root=$METADATA_MIRROR_DIR/$overlay/ --cache-dir=$METADATA_MIRROR_DIR/cache/ --repo=$overlay --update