hooks/resume: Reject zram swap devices when selecting automatically

zram is ephemeral (it's a compressed RAM disk) so we must not use it.

Closes: #861228
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

1 files changed, 7 insertions, 0 deletions

diff --git a/hooks/resume b/hooks/resume
index 1662c66..df6cde8 100755
--- a/hooks/resume
+++ b/hooks/resume
@@ -56,6 +56,13 @@ if ! ischroot && [ -r /proc/swaps ]; then
 			done < /etc/crypttab
 		fi
 
+		# zram is ephemeral
+		case "$resume_auto" in
+		/dev/zram*)
+			ephemeral=true
+			;;
+		esac
+
 		$ephemeral || break
 	done