Add the meson -Denable-systemd=false configure argumentwip/hughsie/no-systemd

Compiling with systemd is turned on by default, obviously. If you turn this
configure option off, and colord breaks, you get to keep all the shards of
broken glass. It's 100% untested, so caveat emptor.

5 files changed, 36 insertions, 20 deletions

diff --git a/contrib/session-helper/meson.build b/contrib/session-helper/meson.build
index 6b6bae0..ffff770 100644
--- a/contrib/session-helper/meson.build
+++ b/contrib/session-helper/meson.build
@@ -15,13 +15,15 @@ con2.set('servicedir',
                     get_option('libexecdir')))
 
 # replace @servicedir@
-configure_file(
-  input : 'colord-session.service.in',
-  output : 'colord-session.service',
-  configuration : con2,
-  install: true,
-  install_dir: systemd.get_pkgconfig_variable('systemduserunitdir'),
-)
+if get_option('enable-systemd')
+  configure_file(
+    input : 'colord-session.service.in',
+    output : 'colord-session.service',
+    configuration : con2,
+    install: true,
+    install_dir: systemd.get_pkgconfig_variable('systemduserunitdir'),
+  )
+endif
 
 # replace @servicedir@
 configure_file(
diff --git a/data/meson.build b/data/meson.build
index 86957b2..f5ce3a7 100644
--- a/data/meson.build
+++ b/data/meson.build
@@ -6,9 +6,11 @@ subdir('ref')
 subdir('tests')
 subdir('ti1')
 
-install_data('colord.conf',
-  install_dir: systemd.get_pkgconfig_variable('tmpfilesdir')
-)
+if get_option('enable-systemd')
+  install_data('colord.conf',
+    install_dir: systemd.get_pkgconfig_variable('tmpfilesdir')
+  )
+endif
 
 if get_option('enable-bash-completion')
   install_data('colormgr',
@@ -23,13 +25,15 @@ con2.set('servicedir',
 con2.set('daemon_user', get_option('with-daemon-user'))
 
 # replace @servicedir@ and @daemon_user@
-configure_file(
-  input : 'colord.service.in',
-  output : 'colord.service',
-  configuration : con2,
-  install: true,
-  install_dir: systemd.get_pkgconfig_variable('systemdsystemunitdir'),
-)
+if get_option('enable-systemd')
+  configure_file(
+    input : 'colord.service.in',
+    output : 'colord.service',
+    configuration : con2,
+    install: true,
+    install_dir: systemd.get_pkgconfig_variable('systemdsystemunitdir'),
+  )
+endif
 
 # replace @servicedir@ and @daemon_user@
 configure_file(
diff --git a/meson.build b/meson.build
index cdbf8b5..227e736 100644
--- a/meson.build
+++ b/meson.build
@@ -114,14 +114,18 @@ gmodule = dependency('gmodule-2.0')
 giounix = dependency('gio-unix-2.0', version : '>= 2.45.8')
 lcms = dependency('lcms2', version : '>= 2.6')
 sqlite = dependency('sqlite3')
-systemd = dependency('systemd')
-libsystemd = dependency('libsystemd')
 gusb = dependency('gusb', version : '>= 0.2.7')
 gudev = dependency('gudev-1.0')
 libm = cc.find_library('m', required: false)
 udev = dependency('udev')
 libudev = dependency('libudev')
 
+if get_option('enable-systemd')
+  systemd = dependency('systemd')
+  libsystemd = dependency('libsystemd')
+  conf.set('HAVE_SYSTEMD', '1')
+endif
+
 if cc.has_header('pwd.h')
   conf.set('HAVE_PWD_H', '1')
 endif
diff --git a/meson_options.txt b/meson_options.txt
index 2904da5..a0e8c65 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -1,5 +1,6 @@
 option('enable-session-example', type : 'boolean', value : false, description : 'Enable session example')
 option('enable-bash-completion', type : 'boolean', value : true, description : 'Enable bash completion')
+option('enable-systemd', type : 'boolean', value : true, description : 'Enable systemd integration')
 option('enable-libcolordcompat', type : 'boolean', value : false, description : 'Enable libcolordcompat.so which is used by ArgyllCMS')
 option('enable-argyllcms-sensor', type : 'boolean', value : true, description : 'Enable ArgllCMS sensor')
 option('enable-reverse', type : 'boolean', value : false, description : 'Enable reverse engineering tools')
diff --git a/src/meson.build b/src/meson.build
index 6c864e5..2b05a90 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -25,6 +25,11 @@ resources_src = gnome.compile_resources(
   dependencies : generated_iccs,
 )
 
+colord_extra_deps = []
+if get_option('enable-systemd')
+  colord_extra_deps += libsystemd
+endif
+
 executable(
   'colord',
   resources_src,
@@ -52,12 +57,12 @@ executable(
     root_incdir,
   ],
   dependencies : [
+    colord_extra_deps,
     giounix,
     gmodule,
     gudev,
     gusb,
     lcms,
-    libsystemd,
     polkit,
     sqlite,
   ],