From 8fc26bd114d2aa997da261ac7c488d4c25116af3 Mon Sep 17 00:00:00 2001
From: Andrew Jorgensen <ajorgens@amazon.com>
Date: Wed, 25 Jul 2018 08:06:57 -0700
Subject: [PATCH] shared/sleep-config: exclude zram devices from hibernation
 candidates

On a host with sufficiently large zram but with no actual swap, logind will
respond to CanHibernate() with yes. With this patch, it will correctly respond
no, unless there are other swap devices to consider.

(cherry picked from commit 411ae92b407bd7b4549b205ad754bcd0e3dfd81f)

Resolves: #1609816
---
 src/shared/sleep-config.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/src/shared/sleep-config.c b/src/shared/sleep-config.c
index 1064fd5cbd..c4334652fc 100644
--- a/src/shared/sleep-config.c
+++ b/src/shared/sleep-config.c
@@ -25,6 +25,7 @@
 #include "sleep-config.h"
 #include "fileio.h"
 #include "log.h"
+#include "path-util.h"
 #include "strv.h"
 #include "util.h"
 
@@ -202,9 +203,19 @@ static int hibernation_partition_size(size_t *size, size_t *used) {
                         continue;
                 }
 
-                if (streq(type, "partition") && endswith(dev, "\\040(deleted)")) {
-                        log_warning("Ignoring deleted swapfile '%s'.", dev);
-                        continue;
+                if (streq(type, "partition")) {
+                        const char *fn;
+
+                        if (endswith(dev, "\\040(deleted)")) {
+                                log_warning("Ignoring deleted swapfile '%s'.", dev);
+                                continue;
+                        }
+
+                        fn = path_startswith(dev, "/dev/");
+                        if (fn && startswith(fn, "zram")) {
+                                log_debug("Ignoring compressed ram swap device '%s'.", dev);
+                                continue;
+                        }
                 }
 
                 *size = size_field;