From 0528d545590b10b8f28e79357bb41ecc867b23a4 Mon Sep 17 00:00:00 2001
From: "Dustin C. Hatch" <dustin@hatch.name>
Date: Sat, 12 Mar 2022 16:11:07 -0600
Subject: [PATCH] rootfs: Add custom systemd presets

Instead of manually managing symlinks to enable units, we can define a
system preset that lists which units we want disabled.  Units that have
in `Install` section are automatically enabled.
---
 .../lib/systemd/system-preset/70-jenkinsagent.preset   | 10 ++++++++++
 rootfs/overlay/usr/lib/systemd/system/htop.service     |  3 +++
 .../system/multi-user.target.wants/htop.service        |  1 -
 rootfs/post-fakeroot.sh                                |  7 -------
 4 files changed, 13 insertions(+), 8 deletions(-)
 create mode 100644 rootfs/overlay/usr/lib/systemd/system-preset/70-jenkinsagent.preset
 delete mode 120000 rootfs/overlay/usr/lib/systemd/system/multi-user.target.wants/htop.service

diff --git a/rootfs/overlay/usr/lib/systemd/system-preset/70-jenkinsagent.preset b/rootfs/overlay/usr/lib/systemd/system-preset/70-jenkinsagent.preset
new file mode 100644
index 0000000..18ebfbb
--- /dev/null
+++ b/rootfs/overlay/usr/lib/systemd/system-preset/70-jenkinsagent.preset
@@ -0,0 +1,10 @@
+enable htop.service
+
+disable cups-lpd.socket
+disable cups.service
+disable cups.socket
+disable cups.path
+
+disable systemd-networkd.service
+disable systemd-resolved.service
+disable systemd-timesyncd.service
diff --git a/rootfs/overlay/usr/lib/systemd/system/htop.service b/rootfs/overlay/usr/lib/systemd/system/htop.service
index ea98c8e..aa2a103 100644
--- a/rootfs/overlay/usr/lib/systemd/system/htop.service
+++ b/rootfs/overlay/usr/lib/systemd/system/htop.service
@@ -17,3 +17,6 @@ ProtectKernelTunables=true
 ProtectKernelModules=true
 CapabilityBoundingSet=
 NoNewPrivileges=true
+
+[Install]
+WantedBy=multi-user.target
diff --git a/rootfs/overlay/usr/lib/systemd/system/multi-user.target.wants/htop.service b/rootfs/overlay/usr/lib/systemd/system/multi-user.target.wants/htop.service
deleted file mode 120000
index cc8a321..0000000
--- a/rootfs/overlay/usr/lib/systemd/system/multi-user.target.wants/htop.service
+++ /dev/null
@@ -1 +0,0 @@
-../htop.service
\ No newline at end of file
diff --git a/rootfs/post-fakeroot.sh b/rootfs/post-fakeroot.sh
index 24dcf25..13f4793 100755
--- a/rootfs/post-fakeroot.sh
+++ b/rootfs/post-fakeroot.sh
@@ -1,9 +1,2 @@
 #!/bin/sh
 
-"${HOST_DIR}"/bin/systemctl --root="${TARGET_DIR}" disable \
-    cups-lpd.socket \
-    cups.service \
-    cups.socket \
-    systemd-networkd.service \
-    systemd-resolved.service \
-    --