From 069cf14150b55e6580cf1d482709a0e48c36ee84 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: #1763617
---
 src/shared/sleep-config.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/src/shared/sleep-config.c b/src/shared/sleep-config.c
index 9e4ce183d3..a1523e3f21 100644
--- a/src/shared/sleep-config.c
+++ b/src/shared/sleep-config.c
@@ -21,6 +21,7 @@
 #include "log.h"
 #include "macro.h"
 #include "parse-util.h"
+#include "path-util.h"
 #include "sleep-config.h"
 #include "string-util.h"
 #include "strv.h"
@@ -201,9 +202,18 @@ int find_hibernate_location(char **device, char **type, size_t *size, size_t *us
                         continue;
                 }
 
-                if (streq(type_field, "partition") && endswith(dev_field, "\\040(deleted)")) {
-                        log_warning("Ignoring deleted swapfile '%s'.", dev_field);
-                        continue;
+                if (streq(type_field, "partition")) {
+                        if (endswith(dev_field, "\\040(deleted)")) {
+                                log_warning("Ignoring deleted swapfile '%s'.", dev_field);
+                                continue;
+                        }
+
+                        const char *fn;
+                        fn = path_startswith(dev_field, "/dev/");
+                        if (fn && startswith(fn, "zram")) {
+                                log_debug("Ignoring compressed ram swap device '%s'.", dev_field);
+                                continue;
+                        }
                 }
                 if (device)
                         *device = TAKE_PTR(dev_field);