intercept: Allow disabling (build-time) the udev redirection

Arch Linux uses a funky udev shim package which is incompatible with
our udev workaround, so allow them to disable it and use their shim
instead (as some packages are apparently **built** against the shim.)

For all other distros which are binary-built in ABI lockstep with udev
proper, keep it enabled.

This fixes #46.

Signed-off-by: Ikey Doherty <ikey@solus-project.com>

meson.build

@@ -90,6 +90,13 @@ if with_snap_support == true
     message('Enabling snapd support. Do NOT do this for distribution builds!')
 endif
 
+with_udev_redirect = get_option('with-udev-redirect')
+if with_udev_redirect == true
+    cdata.set('HAVE_UDEV_REDIRECT', '1')
+    message('Enabling udev soname redirection. DO NOT DO THIS FOR ARCH LINUX!')
+    message('The udev redirect should only be used when not using udev shim')
+endif
+
 config_h = configure_file(
      configuration: cdata,
      output: 'config.h',

meson_options.txt

@@ -14,3 +14,5 @@ option('with-libressl-suffix', type: 'string', value: '-libressl',
         description: 'Suffix for shim LibreSSL library when using --with-libressl-mode=shim')
 
 option('with-snap-support', type: 'boolean', description: 'Build LSI with explicit support for snapd', value: false)
+
+option('with-udev-redirect', type: 'boolean', description: 'Enable libudev soname redirection. DO NOT USE WITH UDEV SHIM.')

src/intercept/main.c

@@ -273,7 +273,9 @@ static const char *vendor_transmute_source[] = {
 
         "libbz2.so.1.0",
 
+#ifdef HAVE_UDEV_REDIRECT
         "libudev.so.0",
+#endif
 };
 
 /**
@@ -311,7 +313,9 @@ static const char *vendor_transmute_target[] = {
 
         "libbz2.so.1.0.6",
 
+#ifdef HAVE_UDEV_REDIRECT
         "libudev.so.1",
+#endif
 };
 
 /**