#!/bin/bash

REPOMD="repodata/repomd.xml"

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

UPDATED_REPOS=""

UPDATED_BUILDROOTS=`mktemp`

# 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

      sha=""

      oldsha=""

      repourl=`echo $REPO | rev| cut -d ' ' -f 1| rev | sed 's/\$arch/x86_64/g'`

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

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

      then

          echo "Repository $REPO is malformed."

          break

      fi 

      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.sha256sum ] 

      then

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

      else

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

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

           if [ $? -gt 0 ]

           then

                UPDATED_REPOS="$UPDATED_REPOS $reponame"

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

           fi

      fi

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