#!/bin/bash

REPOMD="repodata/repomd.xml"

KOJI_CACHE="/var/cache/cbs-monitorexternalrepos"

UPDATED_REPOS=""

UPDATED_BUILDROOTS=`mktemp`

SUPPORTED_ARCHES="x86_64 i386 ppc64le aarch64"

# Ensure the cache directory is available

[ ! -d $KOJI_CACHE ] && mkdir -p $KOJI_CACHE

OLDIFS="$IFS"

IFS=$'\n'

for REPO in `koji list-external-repos --quiet`

do

	IFS="$OLDIFS"

	for ARCH in $SUPPORTED_ARCHES

	do

		httpcode=""

		sha=""

		oldsha=""

		eval repourl=`echo $REPO | rev| cut -d ' ' -f 1| rev | sed 's#\$arch#$ARCH#g'`

		reponame=`echo $REPO | cut -d ' ' -f 1`

		if [ "x$reponame" == "x" ]

		then

			echo "Repository $REPO is malformed."

			break

		fi

		httpcode=$(curl -s --head -w %{http_code} $repourl -o /dev/null)

		if [ $? -gt 0 ]

		then

			echo "[WARN] Couldn't retrieve $repourl . Skipping $reponame regeneration."

			continue

		else

			httpcode=$(( httpcode + 0 ))

			if [ $httpcode -gt 400 ]

			then

				echo "[INFO] Skipping $reponame.$ARCH ; $ARCH not available."

				continue

			else

				sha=`curl --silent $repourl/$REPOMD | sha256sum`

				if [ $? -gt 0 ]

				then

					echo "Couldn't retrieve $repourl/$REPOMD. Skipping $reponame regeneration."

					continue

				fi

				if [ ! -f $KOJI_CACHE/$reponame.$ARCH.sha256sum ]

				then

					echo "$sha" > $KOJI_CACHE/$reponame.$ARCH.sha256sum

					UPDATED_REPOS="$UPDATED_REPOS $reponame"

				else

					oldsha=`cat $KOJI_CACHE/$reponame.$ARCH.sha256sum`

					diff <(echo "$sha") <(echo "$oldsha") &> /dev/null

					if [ $? -gt 0 ]

					then

						echo "in"

						UPDATED_REPOS="$UPDATED_REPOS $reponame"

						echo "$sha" > $KOJI_CACHE/$reponame.$ARCH.sha256sum

					fi

				fi

			fi

		fi

	done

done

IFS="$OLDIFS"

for REPO in $UPDATED_REPOS

do

    buildroots=`koji list-external-repos --name=$REPO --quiet --used | cut -d ' ' -f 1`

    printf "$buildroots\n" >> $UPDATED_BUILDROOTS 

done

for BR in `cat $UPDATED_BUILDROOTS | sort | uniq`

do

    echo koji regen-repo --nowait $BR

done