reproducible Debian: fixup 7a08f9df, only act if directory exists

echo "$(date -u) - Checking for files with bad permissions."

# automatically fix rbuild files with wrong permissions...

# (we know it happens (very rarely) but... shrugs.)

find $DEBIAN_BASE/rbuild ! -perm 644 -type f -exec chmod -v 644 {} \;

[ ! -d $DEBIAN_BASE/rbuild ] || find $DEBIAN_BASE/rbuild ! -perm 644 -type f -exec chmod -v 644 {} \;

BADPERMS=$(find $DEBIAN_BASE/{buildinfo,dbd,artifacts,stretch,buster,unstable,experimental,rb-pkg} ! -perm 644 -type f 2>/dev/null|| true)

if [ ! -z "$BADPERMS" ] ; then

    DIRTY=true