From d61fff55fc4c19b257107ca5d81db4f468a79874 Mon Sep 17 00:00:00 2001
From: Dennis Camera <dennis.camera@ssrq-sds-fds.ch>
Date: Tue, 23 Feb 2021 14:08:09 +0100
Subject: [PATCH] __ssrq_zfs add --tunable and set ZFS tunables on kamor

---
 type/__ssrq_zfs/man.rst                     |  8 ++++++++
 type/__ssrq_zfs/manifest                    | 10 ++++++++++
 type/__ssrq_zfs/parameter/optional_multiple |  1 +
 3 files changed, 19 insertions(+)
 create mode 100644 type/__ssrq_zfs/parameter/optional_multiple

diff --git a/type/__ssrq_zfs/man.rst b/type/__ssrq_zfs/man.rst
index f9e5981..c3da687 100644
--- a/type/__ssrq_zfs/man.rst
+++ b/type/__ssrq_zfs/man.rst
@@ -20,6 +20,14 @@ OPTIONAL PARAMETERS
 -------------------
 mailto
     The user or email address to which alert mails should be sent to.
+tunable
+    Set a ZFS tunable parameter to the given value.
+    Use this option multiple times to set more than one tunable.
+
+    The value should be a key-value pair separated by a ``=`` (equals sign).
+
+    For a reference of available tunables, cf.
+    `zfs-module-parameters(5) <https://openzfs.github.io/openzfs-docs/man/5/zfs-module-parameters.5.html>`_.
 
 
 BOOLEAN PARAMETERS
diff --git a/type/__ssrq_zfs/manifest b/type/__ssrq_zfs/manifest
index eb0a7af..5e13087 100755
--- a/type/__ssrq_zfs/manifest
+++ b/type/__ssrq_zfs/manifest
@@ -76,6 +76,16 @@ in
 		;;
 esac
 
+require='__package_apt/zfs-modules' \
+__block /etc/modprobe.d/zfs.conf:cdist-zfs-tunables \
+	--state "$(test -s "${__object:?}/parameter/tunable" && echo present || echo absent)" \
+	--file /etc/modprobe.d/zfs.conf \
+	--prefix '# cdist:zfs-tunables' \
+	--suffix '#/cdist:zfs-tunables' \
+	--text - <<EOF
+$(sed -e 's/^/options zfs /' "${__object:?}/parameter/tunable")
+EOF
+
 set_zed_rc() {
 	require=__package_apt/zfs-zed \
 	__key_value /etc/zfs/zed.d/zed.rc:"$1" \
diff --git a/type/__ssrq_zfs/parameter/optional_multiple b/type/__ssrq_zfs/parameter/optional_multiple
new file mode 100644
index 0000000..2d3f0c9
--- /dev/null
+++ b/type/__ssrq_zfs/parameter/optional_multiple
@@ -0,0 +1 @@
+tunable