WIP: rust: Add sysusers code

See #49

Author: cgwalters

docs/manual/treefile.md

@@ -88,6 +88,10 @@ It supports the following parameters:
 
    Note this does not alter the RPM database, so `rpm -V` will complain.
 
+ * `sysusers`: boolean, optional: Defaults to `false`. Enable generation of
+   systemd sysusers.d entries based on `useradd` invocations.  If enabled,
+   this overrides `preserve-passwd`.  It also obsoletes `check-passwd`.
+
  * `preserve-passwd`: boolean, optional: Defaults to `true`.  If enabled,
    and `check-passwd` has a type other than file, copy the `/etc/passwd` (and
    `/usr/lib/passwd`) files from the previous commit if they exist. If

rust/src/lib.rs

@@ -17,6 +17,7 @@
  */
 
 extern crate c_utf8;
+extern crate clap;
 extern crate curl;
 #[macro_use]
 extern crate failure;
@@ -50,3 +51,5 @@ pub use journal::*;
 mod utils;
 pub use utils::*;
 mod openat_utils;
+mod sysusers;
+pub use sysusers::*;