-# this is the auto-generated sources.list file by grml-live,
-# will be overriden by $GRML_FAI_CONFIG/scripts/GRMLBASE/33-aptsetup
-fcopy -v -c GRML_LIVE_SOURCES_LIST /etc/apt/sources.list
+# install packages from a repository of a specific date
+if [ -n "${WAYBACK_DATE:-}" ] ; then
+ echo "Wayback date '$WAYBACK_DATE' identified, enabling for snapshot.debian.org usage."
+
+ perl -pi -e "s#^(\s+)(deb.* )(.*://ftp.debian.org.*?)\s+([a-z-]+)\s+(.*)\$#\$1\$2 [check-valid-until=no] http://snapshot.debian.org/archive/debian/$WAYBACK_DATE/ \$4 \$5#" \
+ "${target}/etc/apt/sources.list.d/debian.list"
+
+ perl -pi -e "s#^(\s+)(deb.* )(.*://security.debian.org.*?)\s+([a-z-/]+)\s+(.*)\$#\$1\$2 [check-valid-until=no] http://snapshot.debian.org/archive/debian-security/$WAYBACK_DATE/ \$4 \$5#" \
+ "${target}/etc/apt/sources.list.d/debian.list"
+fi