Using SELinux mount options per default breaks several systems.
Either the context= mount option is not known at all to the kernel,
as reported for ArchLinux. Or the default value "none" is unknown to
SELinux, as reported for Fedora. In both cases the unit will fail.

The proper place to specify mount options is /etc/fstab. Appearently
systemd is kind enough to use values from there even if Options= or
What= is specified in a .mount file.

Remove XENSTORED_MOUNT_CTX, the reference to a non-existant
EnvironmentFile and trim default Options= for the mount point.

The removed code was first mentioned in the patch referenced below,
with the following description:
...
 * Some systems define the selinux context in the systemd Option for
   the /var/lib/xenstored tmpfs:
     Options=mode=755,context="system_u:object_r:xenstored_var_lib_t:s0"
   For the upstream version we remove that and let systems specify
   the context on their system /etc/default/xenstored or
   /etc/sysconfig/xenstored $XENSTORED_MOUNT_CTX variable
...
It is nowhere stated (on xen-devel) what "Some systems" means, which
is unfortunately common practice in nearly all opensource projects.
http://lists.xenproject.org/archives/html/xen-devel/2014-03/msg02462.html

Signed-off-by: Olaf Hering <o...@aepfle.de>
Cc: Ian Jackson <ian.jack...@eu.citrix.com>
Cc: Stefano Stabellini <stefano.stabell...@eu.citrix.com>
Cc: Ian Campbell <ian.campb...@citrix.com>
Cc: Wei Liu <wei.l...@citrix.com>
Cc: Anthony PERARD <anthony.per...@citrix.com>
Cc: M A Young <m.a.yo...@durham.ac.uk>
Cc: Luis R. Rodriguez <mcg...@do-not-panic.com>
---
 tools/hotplug/Linux/systemd/var-lib-xenstored.mount.in | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/tools/hotplug/Linux/systemd/var-lib-xenstored.mount.in 
b/tools/hotplug/Linux/systemd/var-lib-xenstored.mount.in
index d5e04db..11a7d50 100644
--- a/tools/hotplug/Linux/systemd/var-lib-xenstored.mount.in
+++ b/tools/hotplug/Linux/systemd/var-lib-xenstored.mount.in
@@ -6,9 +6,7 @@ ConditionPathExists=/proc/xen/capabilities
 RefuseManualStop=true
 
 [Mount]
-Environment=XENSTORED_MOUNT_CTX=none
-EnvironmentFile=-@CONFIG_DIR@/@CONFIG_LEAF_DIR@/xenstored
 What=xenstore
 Where=@XEN_LIB_STORED@
 Type=tmpfs
-Options=mode=755,context="$XENSTORED_MOUNT_CTX"
+Options=mode=755

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