From 66d234cc3d5495c8e236ada5ab0df31d9bcec94a Mon Sep 17 00:00:00 2001
From: Bruce Leidl <bruce@subgraph.com>
Date: Sun, 18 Feb 2018 12:58:09 -0500
Subject: [PATCH] add systemd unit to configure and enable /dev/zram0 swap

---
 .../base-files/base-files_%.bbappend           |  7 +++++++
 .../base-files/files/zram-swap.service         | 18 ++++++++++++++++++
 2 files changed, 25 insertions(+)
 create mode 100644 meta-citadel-distro/recipes-core/base-files/files/zram-swap.service

diff --git a/meta-citadel-distro/recipes-core/base-files/base-files_%.bbappend b/meta-citadel-distro/recipes-core/base-files/base-files_%.bbappend
index 4299479..6cca0d9 100644
--- a/meta-citadel-distro/recipes-core/base-files/base-files_%.bbappend
+++ b/meta-citadel-distro/recipes-core/base-files/base-files_%.bbappend
@@ -8,6 +8,7 @@ SRC_URI += "\
     file://99-grsec-debootstrap.conf \
     file://00-storage-tmpfiles.conf \
     file://NetworkManager.conf \
+    file://zram-swap.service \
 "
 
 dirs1777_remove = "${localstatedir}/volatile/tmp"
@@ -15,6 +16,9 @@ dirs755="/boot /dev /usr/bin /usr/sbin /usr/lib /etc /etc/default /etc/skel /usr
 
 volatiles = ""
 
+inherit systemd
+SYSTEMD_SERVICE_${PN} = "zram-swap.service"
+
 do_install_append () {
     install -m 0755 -d ${D}/storage
     install -d ${D}${libdir}/sysctl.d
@@ -30,6 +34,9 @@ do_install_append () {
     install -m 0644 ${WORKDIR}/00-storage-tmpfiles.conf ${D}${sysconfdir}/tmpfiles.d
     install -m 0644 ${WORKDIR}/NetworkManager.conf ${D}${sysconfdir}/NetworkManager
 
+    install -d ${D}${systemd_system_unitdir}
+    install -m 644 ${WORKDIR}/zram-swap.service ${D}${systemd_system_unitdir}
+
     # disable some pax and grsecurity features so that debootstrap will work
     # this should be removed later
     install -m 0644 ${WORKDIR}/99-grsec-debootstrap.conf ${D}${libdir}/sysctl.d/
diff --git a/meta-citadel-distro/recipes-core/base-files/files/zram-swap.service b/meta-citadel-distro/recipes-core/base-files/files/zram-swap.service
new file mode 100644
index 0000000..680216f
--- /dev/null
+++ b/meta-citadel-distro/recipes-core/base-files/files/zram-swap.service
@@ -0,0 +1,18 @@
+[Unit]
+Description=Enable/Disable zram swap device
+ConditionPathExists=/dev/zram0
+ConditionPathExists=/sys/block/zram0
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+
+ExecStart=/bin/sh -c 'echo 2G > /sys/block/zram0/disksize'
+ExecStart=/sbin/mkswap /dev/zram0
+ExecStart=/sbin/swapon /dev/zram0 -p 10
+
+ExecStop=/sbin/swapoff /dev/zram0
+ExecStop=/bin/sh -c 'echo 1 > /sys/block/zram0/reset'
+
+[Install]
+WantedBy=multi-user.target