Turn subproject as fallback (#1)

Use system-wide INIReader if available or fallback to use subproject

src/pam/README.md

@@ -1,20 +1,34 @@
 # Howdy PAM module
 
+## Prepare
+
+Howdy PAM module depends on `INIReader`.
+
+If you are building a distro package,
+there is a list for it below:
+
+```
+Arch Linux - libinih
+Debian     - libinih-dev
+Fedora     - inih-devel
+OpenSUSE   - inih
+```
+
 ## Build
 
-```sh
-meson setup build -Dinih:with_INIReader=true
+``` sh
+meson setup build
 meson compile -C build
 ```
 
 ## Install
 
-```sh
-sudo mv build/libpam_howdy.so /lib/security/pam_howdy.so
+``` sh
+sudo meson install -C build
 ```
 
 Change PAM config line to:
 
-```pam
-auth     sufficient pam_howdy.so
+``` pam
+auth  sufficient  pam_howdy.so
 ```

src/pam/meson.build

@@ -1,9 +1,20 @@
 project('pam_howdy', 'cpp', version: '0.1.0', default_options: ['cpp_std=c++14'])
 
-inih = subproject('inih')
-inih_cpp = inih.get_variable('INIReader_dep')
-
-libpam = meson.get_compiler('c').find_library('pam')
 boost = dependency('boost', modules: ['locale'])
+inih_cpp = dependency('INIReader', fallback: ['inih', 'INIReader_dep'])
+libpam = meson.get_compiler('cpp').find_library('pam')
 threads = dependency('threads')
-shared_library('pam_howdy', 'main.cc', dependencies: [boost, libpam, inih_cpp, threads], install: true, install_dir: '/lib/security/')
+
+shared_library(
+	'pam_howdy',
+	'main.cc',
+	dependencies: [
+		boost,
+		libpam,
+		inih_cpp,
+		threads
+	],
+	install: true,
+	install_dir: '/lib/security',
+	name_prefix: ''
+)

src/pam/subprojects/inih.wrap

@@ -1,3 +1,3 @@
 [wrap-git]
 url = https://github.com/benhoyt/inih.git
-revision = r52
+revision = head