From 0f5dc89d0772eba2d1a06a57a7d3aeb69146a5a2 Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Thu, 25 Apr 2019 20:58:13 -0400
Subject: _mutex_trylock(), mutex_is_unlockable(): Make "set -e"-safe

---
diff --git a/src/mutex.sh b/src/mutex.sh
index 4aa8e1f..be63d96 100644
--- a/src/mutex.sh
+++ b/src/mutex.sh
@@ -22,9 +22,8 @@ _mutex_trylock()
 {
 	local mutex="${1}"
 
-	(set -C; printf '%d\n' "${$}" >"${mutex}") 2>/dev/null
-
-	return ${?}
+	(set -C; printf '%d\n' "${$}" >"${mutex}") 2>/dev/null || return ${?}
+	return 0
 }
 
 mutex_timedlock()
@@ -52,7 +51,6 @@ mutex_is_unlockable()
 {
 	local mutex="${1}"
 
-	[ "x$(cat "${mutex}" 2>/dev/null)" = "x${$}" ]
-
-	return ${?}
+	[ "x$(cat "${mutex}" 2>/dev/null)" = "x${$}" ] || return ${?}
+	return 0
 }
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