From 2695f1d8fe6e47eaf1d3adf8f655389d0dffd14a Mon Sep 17 00:00:00 2001
From: Luca Weiss <luca@z3ntu.xyz>
Date: Mon, 6 Dec 2021 22:57:24 +0100
Subject: Do not install systemd service file if not found

Fixes #42
---
 data/CMakeLists.txt | 33 ++++++++++++++++++---------------
 1 file changed, 18 insertions(+), 15 deletions(-)

diff --git a/data/CMakeLists.txt b/data/CMakeLists.txt
index 6f8cda1..cd052b6 100644
--- a/data/CMakeLists.txt
+++ b/data/CMakeLists.txt
@@ -21,21 +21,24 @@ add_schema (${SCHEMA_NAME})
 ##  Systemd Unit File
 ##
 
-# where to install
-pkg_get_variable(SYSTEMD_USER_DIR systemd systemduserunitdir)
-message (STATUS "${SYSTEMD_USER_DIR} is the systemd user unit file install dir")
-
-set (SYSTEMD_USER_NAME "${CMAKE_PROJECT_NAME}.service")
-set (SYSTEMD_USER_FILE "${CMAKE_CURRENT_BINARY_DIR}/${SYSTEMD_USER_NAME}")
-set (SYSTEMD_USER_FILE_IN "${CMAKE_CURRENT_SOURCE_DIR}/${SYSTEMD_USER_NAME}.in")
-
-# build it
-set (pkglibexecdir "${CMAKE_INSTALL_FULL_PKGLIBEXECDIR}")
-configure_file ("${SYSTEMD_USER_FILE_IN}" "${SYSTEMD_USER_FILE}")
-
-# install it
-install (FILES "${SYSTEMD_USER_FILE}"
-         DESTINATION "${SYSTEMD_USER_DIR}")
+pkg_check_modules(SYSTEMD systemd)
+if (${SYSTEMD_FOUND})
+    # where to install
+    pkg_get_variable(SYSTEMD_USER_DIR systemd systemduserunitdir)
+    message (STATUS "${SYSTEMD_USER_DIR} is the systemd user unit file install dir")
+
+    set (SYSTEMD_USER_NAME "${CMAKE_PROJECT_NAME}.service")
+    set (SYSTEMD_USER_FILE "${CMAKE_CURRENT_BINARY_DIR}/${SYSTEMD_USER_NAME}")
+    set (SYSTEMD_USER_FILE_IN "${CMAKE_CURRENT_SOURCE_DIR}/${SYSTEMD_USER_NAME}.in")
+
+    # build it
+    set (pkglibexecdir "${CMAKE_INSTALL_FULL_PKGLIBEXECDIR}")
+    configure_file ("${SYSTEMD_USER_FILE_IN}" "${SYSTEMD_USER_FILE}")
+
+    # install it
+    install (FILES "${SYSTEMD_USER_FILE}"
+             DESTINATION "${SYSTEMD_USER_DIR}")
+endif()
 
 ##
 ##  XDG Autostart Config File
-- 
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