Prereqs

src/resources/mod.rs

@@ -22,3 +22,12 @@ impl<'a> Resource for DirResource<'a> {
   fn get_type(&self) -> &str { "dir" }
   fn get_value(&self) -> &str { &*self.path }
 }
+
+pub struct FileResource<'a> {
+  pub path: Cow<'a, str>
+}
+
+impl<'a> Resource for FileResource<'a> {
+  fn get_type(&self) -> &str { "file" }
+  fn get_value(&self) -> &str { &*self.path }
+}

src/symbols/acme/cert.rs

@@ -6,6 +6,7 @@ use std::io::{self, Write};
 
 use command_runner::CommandRunner;
 use symbols::Symbol;
+use resources::{FileResource, Resource};
 
 pub struct AcmeCert<'a> {
   domain: Cow<'a, str>,
@@ -20,10 +21,6 @@ impl<'a> AcmeCert<'a> {
     }
   }
 
-  fn get_key_path(&self) -> String {
-    format!("/etc/ssl/private/{}.key", self.domain)
-  }
-
   fn get_csr_path(&self) -> String {
     format!("/etc/ssl/local_certs/{}.csr", self.domain)
   }
@@ -74,6 +71,10 @@ impl<'a> Symbol for AcmeCert<'a> {
     try!(file.write_all(&output.stdout));
     Ok(())
   }
+
+  fn get_prerequisites(&self) -> Vec<Box<Resource>> {
+    vec![Box::new(FileResource { path: self.get_csr_path().into() })]
+  }
 }
 
 #[cfg(test)]

src/symbols/hook.rs

@@ -1,6 +1,7 @@
 use std::error::Error;
 use std::fmt;
 
+use resources::Resource;
 use symbols::Symbol;
 
 pub struct Hook<A, B> where A: Symbol, B: Symbol {
@@ -23,6 +24,13 @@ impl<A, B> Symbol for Hook<A, B> where A: Symbol, B: Symbol {
     try!(self.a.execute());
     self.b.execute()
   }
+
+  fn get_prerequisites(&self) -> Vec<Box<Resource>> {
+    let mut r = vec![];
+    r.extend(self.a.get_prerequisites().into_iter());
+    r.extend(self.b.get_prerequisites().into_iter());
+    r
+  }
 }
 
 impl<A, B> fmt::Display for Hook<A, B> where A: Symbol, B: Symbol {

src/symbols/tls/csr.rs

@@ -3,6 +3,7 @@ use std::error::Error;
 use std::fmt;
 
 use command_runner::CommandRunner;
+use resources::{Resource, FileResource};
 use symbols::Symbol;
 
 pub struct TlsCsr<'a> {
@@ -50,6 +51,10 @@ impl<'a> Symbol for TlsCsr<'a> {
     let output = try!(self.command_runner.run_with_args("openssl", &["req", "-new", "-sha256", "-key", &self.get_key_path(), "-out", &self.get_csr_path(), "-subj", &format!("/CN={}", self.domain)]).map_err(|e| Box::new(e)));
     Ok(())
   }
+
+  fn get_prerequisites(&self) -> Vec<Box<Resource>> {
+    vec![Box::new(FileResource { path: self.get_key_path().into() })]
+  }
 }
 
 #[cfg(test)]

src/symbols/tls/self_signed_cert.rs

@@ -3,6 +3,7 @@ use std::error::Error;
 use std::fmt;
 
 use command_runner::CommandRunner;
+use resources::{Resource, FileResource};
 use symbols::Symbol;
 
 pub struct SelfSignedTlsCert<'a> {
@@ -55,6 +56,10 @@ impl<'a> Symbol for SelfSignedTlsCert<'a> {
       Ok(_) => Ok(())
     }
   }
+
+  fn get_prerequisites(&self) -> Vec<Box<Resource>> {
+    vec![Box::new(FileResource { path: self.get_key_path().into() })]
+  }
 }
 
 #[cfg(test)]