From 30308e35fac0491ab777495e2ee7e472378d375a Mon Sep 17 00:00:00 2001
From: Scott Moreau <oreaus@gmail.com>
Date: Mon, 23 Mar 2020 20:45:36 -0600
Subject: build: Add 'auto' to logind-provider combo option

The logind provider defaulted to systemd and in order to use elogind,
-Dlogin-provider=elogind was required. This adds 'auto' as a choice
for the login-provider option and sets it as default. Using 'auto',
the build will check for systemd first and if it's not found, try
to find and use elogind automatically.
---
 backend/session/meson.build | 45 ++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 38 insertions(+), 7 deletions(-)

(limited to 'backend')

diff --git a/backend/session/meson.build b/backend/session/meson.build
index 2c3f09c7..65e4595d 100644
--- a/backend/session/meson.build
+++ b/backend/session/meson.build
@@ -21,15 +21,46 @@ if not get_option('logind').disabled()
 	msg += 'You may need to pass "-Dlogind-provider=elogind" or "-Dlogind-provider=systemd" to ensure the correct library is detected.'
 endif
 
-logind = dependency('lib' + get_option('logind-provider'),
-	required: get_option('logind'),
-	not_found_message: '\n'.join(msg).format(get_option('logind-provider')),
-	version: '>=237',
-)
-if logind.found()
+logind_version = '>=237'
+logind_found = false
+
+if get_option('logind-provider') == 'auto'
+	if not get_option('logind').disabled()
+		assert(get_option('auto_features').auto(), '-Dlogind-provider must be set to systemd or elogind since auto_features != auto')
+		logind = dependency('libsystemd',
+			required: get_option('logind'),
+			not_found_message: 'libsystemd not found, trying libelogind\n' + '\n'.join(msg),
+			version: logind_version,
+		)
+		if logind.found()
+			conf_data.set10('WLR_HAS_SYSTEMD', true)
+		else
+			logind = dependency('libelogind',
+				required: get_option('logind'),
+				not_found_message: 'libelogind not found\n' + '\n'.join(msg),
+				version: logind_version,
+			)
+			if logind.found()
+				conf_data.set10('WLR_HAS_ELOGIND', true)
+			endif
+		endif
+		logind_found = logind.found()
+	endif
+else
+	logind = dependency('lib' + get_option('logind-provider'),
+		required: get_option('logind'),
+		not_found_message: '\n'.join(msg).format(get_option('logind-provider')),
+		version: logind_version,
+	)
+	if logind.found()
+		conf_data.set10('WLR_HAS_' + get_option('logind-provider').to_upper(), true)
+		logind_found = true
+	endif
+endif
+
+if logind_found
 	wlr_files += files('logind.c')
 	wlr_deps += logind
-	conf_data.set10('WLR_HAS_' + get_option('logind-provider').to_upper(), true)
 endif
 
 # libcap
-- 
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