Subject: Use the --null-data option of grep to scan the environment
Author: Christoph Biedl <debian.axhn@manchmal.in-ulm.de>
Date: 2002-02-24

--- a/src/initramfs-tools/scripts/local-top/clevis.in
+++ b/src/initramfs-tools/scripts/local-top/clevis.in
@@ -106,7 +106,7 @@
         done
 
         # Import CRYPTTAB_SOURCE from the askpass process.
-        local "$(grep '^CRYPTTAB_SOURCE=' /proc/"$pid"/environ)"
+        local "$(grep -z '^CRYPTTAB_SOURCE=' /proc/"$pid"/environ)"
 
         # Make sure that CRYPTTAB_SOURCE is actually a block device
         [ ! -b "$CRYPTTAB_SOURCE" ] && continue