Add cron

src/symbols/cron.rs

@@ -0,0 +1,77 @@
+use std::error::Error;
+use std::fmt;
+use std::ops::Deref;
+
+use command_runner::CommandRunner;
+use resources::Resource;
+use symbols::{Action, OwnedSymbolAction, Symbol, SymbolAction, SymbolRunner};
+
+pub struct Cron<'r, C, U, R: 'r + CommandRunner>
+where
+  C: Deref<Target = str>,
+  U: Deref<Target = str>,
+{
+  user: U,
+  content: C,
+  command_runner: &'r R,
+}
+
+impl<'r, U, R: 'r + CommandRunner> Cron<'r, String, U, R>
+where
+  U: Deref<Target = str>,
+{
+  pub fn new<C: Deref<Target = str>>(user: U, content: C, command_runner: &'r R) -> Self {
+    Cron {
+      user,
+      content: String::from(&*content) + "\n",
+      command_runner,
+    }
+  }
+}
+
+impl<'r, C, U, R: 'r + CommandRunner> Symbol for Cron<'r, C, U, R>
+where
+  C: Deref<Target = str>,
+  U: Deref<Target = str>,
+{
+  fn target_reached(&self) -> Result<bool, Box<dyn Error>> {
+    let tab = try!(self
+      .command_runner
+      .get_output("crontab", &["-l", "-u", &self.user]));
+    return Ok(tab == self.content.bytes().collect::<Vec<u8>>());
+  }
+
+  fn execute(&self) -> Result<(), Box<dyn Error>> {
+    self.command_runner.run_with_args_and_stdin(
+      "crontab",
+      &["-u", &self.user, "-"],
+      &self.content,
+    )?;
+    Ok(())
+  }
+
+  fn get_prerequisites(&self) -> Vec<Resource> {
+    vec![]
+  }
+
+  fn as_action<'a>(&'a self, runner: &'a dyn SymbolRunner) -> Box<dyn Action + 'a> {
+    Box::new(SymbolAction::new(runner, self))
+  }
+
+  fn into_action<'a>(self: Box<Self>, runner: &'a dyn SymbolRunner) -> Box<dyn Action + 'a>
+  where
+    Self: 'a,
+  {
+    Box::new(OwnedSymbolAction::new(runner, *self))
+  }
+}
+
+impl<'r, C, U, R: 'r + CommandRunner> fmt::Display for Cron<'r, C, U, R>
+where
+  C: Deref<Target = str>,
+  U: Deref<Target = str>,
+{
+  fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+    write!(f, "Cron {}", &*self.user)
+  }
+}

src/symbols/factory.rs

@@ -5,6 +5,7 @@ use std::path::Path;
 use command_runner::{CommandRunner, SetuidCommandRunner};
 use storage::{SimpleStorage, Storage};
 use symbols::acme::{AcmeCert, AcmeCertChain};
+use symbols::cron::Cron;
 use symbols::file::File;
 use symbols::git::checkout::GitCheckout;
 use symbols::hook::Hook;
@@ -368,4 +369,12 @@ env[PATH] = /usr/local/bin:/usr/bin:/bin
   ) -> Box<dyn Action + 'a> {
     Box::new(File::new(path, content)).into_action(self.symbol_runner)
   }
+
+  pub fn get_cron<'a, T: 'a + Deref<Target = str>, U: 'a + Deref<Target = str>>(
+    &'a self,
+    user: U,
+    content: T,
+  ) -> Box<dyn Action + 'a> {
+    Box::new(Cron::new(user, content, self.command_runner)).into_action(self.symbol_runner)
+  }
 }

src/symbols/mod.rs

@@ -68,6 +68,7 @@ impl<'a, S: Symbol + 'a> Action for OwnedSymbolAction<'a, S> {
 }
 
 pub mod acme;
+pub mod cron;
 pub mod dir;
 pub mod factory;
 pub mod file;