Move nix::NixCommand to util::CommandExt

src/nix/hive/mod.rs

@@ -19,8 +19,7 @@ use super::{
     StorePath,
 };
 use super::deployment::TargetNode;
-use super::NixCommand;
-use crate::util::CommandExecution;
+use crate::util::{CommandExecution, CommandExt};
 use crate::job::JobHandle;
 
 #[cfg(test)]

src/nix/host/local.rs

@@ -6,8 +6,8 @@ use async_trait::async_trait;
 use tokio::process::Command;
 
 use super::{CopyDirection, CopyOptions, Host, key_uploader};
-use crate::nix::{StorePath, Profile, Goal, NixError, NixResult, NixCommand, Key, SYSTEM_PROFILE, CURRENT_PROFILE};
-use crate::util::CommandExecution;
+use crate::nix::{StorePath, Profile, Goal, NixError, NixResult, Key, SYSTEM_PROFILE, CURRENT_PROFILE};
+use crate::util::{CommandExecution, CommandExt};
 use crate::job::JobHandle;
 
 /// The local machine running Colmena.

src/nix/host/ssh.rs

@@ -7,8 +7,8 @@ use async_trait::async_trait;
 use tokio::process::Command;
 
 use super::{CopyDirection, CopyOptions, Host, key_uploader};
-use crate::nix::{StorePath, Profile, Goal, NixResult, NixCommand, NixError, Key, SYSTEM_PROFILE, CURRENT_PROFILE};
-use crate::util::CommandExecution;
+use crate::nix::{StorePath, Profile, Goal, NixResult, NixError, Key, SYSTEM_PROFILE, CURRENT_PROFILE};
+use crate::util::{CommandExecution, CommandExt};
 use crate::job::JobHandle;
 
 /// A remote machine connected over SSH.

src/nix/mod.rs

@@ -1,21 +1,16 @@
 use std::collections::HashMap;
-use std::convert::TryFrom;
 use std::hash::Hash;
 use std::ops::Deref;
 use std::os::unix::process::ExitStatusExt;
 use std::path::Path;
-use std::process::{ExitStatus, Stdio};
+use std::process::ExitStatus;
 
-use async_trait::async_trait;
-use serde::de::{self, DeserializeOwned};
+use serde::de;
 use serde::{Deserialize, Deserializer, Serialize};
 use snafu::Snafu;
-use tokio::process::Command;
 use users::get_current_username;
 use validator::{Validate, ValidationErrors, ValidationError as ValidationErrorType};
 
-use crate::util::CommandExecution;
-
 pub mod host;
 pub use host::{Host, CopyDirection, CopyOptions};
 use host::Ssh;
@@ -181,14 +176,6 @@ pub struct NodeConfig {
     keys: HashMap<String, Key>,
 }
 
-#[async_trait]
-trait NixCommand {
-    async fn passthrough(&mut self) -> NixResult<()>;
-    async fn capture_output(&mut self) -> NixResult<String>;
-    async fn capture_json<T>(&mut self) -> NixResult<T> where T: DeserializeOwned;
-    async fn capture_store_path(&mut self) -> NixResult<StorePath>;
-}
-
 impl NodeName {
     /// Returns the string.
     pub fn as_str(&self) -> &str {
@@ -258,86 +245,6 @@ impl NodeConfig {
     }
 }
 
-#[async_trait]
-impl NixCommand for Command {
-    /// Runs the command with stdout and stderr passed through to the user.
-    async fn passthrough(&mut self) -> NixResult<()> {
-        let exit = self
-            .spawn()?
-            .wait()
-            .await?;
-
-        if exit.success() {
-            Ok(())
-        } else {
-            Err(exit.into())
-        }
-    }
-
-    /// Captures output as a String.
-    async fn capture_output(&mut self) -> NixResult<String> {
-        // We want the user to see the raw errors
-        let output = self
-            .stdout(Stdio::piped())
-            .stderr(Stdio::inherit())
-            .spawn()?
-            .wait_with_output()
-            .await?;
-
-        if output.status.success() {
-            // FIXME: unwrap
-            Ok(String::from_utf8(output.stdout).unwrap())
-        } else {
-            Err(output.status.into())
-        }
-    }
-
-    /// Captures deserialized output from JSON.
-    async fn capture_json<T>(&mut self) -> NixResult<T> where T: DeserializeOwned {
-        let output = self.capture_output().await?;
-        serde_json::from_str(&output).map_err(|_| NixError::BadOutput {
-            output: output.clone()
-        })
-    }
-
-    /// Captures a single store path.
-    async fn capture_store_path(&mut self) -> NixResult<StorePath> {
-        let output = self.capture_output().await?;
-        let path = output.trim_end().to_owned();
-        StorePath::try_from(path)
-    }
-}
-
-#[async_trait]
-impl NixCommand for CommandExecution {
-    async fn passthrough(&mut self) -> NixResult<()> {
-        self.run().await
-    }
-
-    /// Captures output as a String.
-    async fn capture_output(&mut self) -> NixResult<String> {
-        self.run().await?;
-        let (stdout, _) = self.get_logs();
-
-        Ok(stdout.unwrap().to_owned())
-    }
-
-    /// Captures deserialized output from JSON.
-    async fn capture_json<T>(&mut self) -> NixResult<T> where T: DeserializeOwned {
-        let output = self.capture_output().await?;
-        serde_json::from_str(&output).map_err(|_| NixError::BadOutput {
-            output: output.clone()
-        })
-    }
-
-    /// Captures a single store path.
-    async fn capture_store_path(&mut self) -> NixResult<StorePath> {
-        let output = self.capture_output().await?;
-        let path = output.trim_end().to_owned();
-        StorePath::try_from(path)
-    }
-}
-
 fn validate_keys(keys: &HashMap<String, Key>) -> Result<(), ValidationErrorType> {
     // Bad secret names:
     // - /etc/passwd

src/nix/store.rs

@@ -7,7 +7,8 @@ use std::fmt;
 use serde::{Serialize, Deserialize};
 use tokio::process::Command;
 
-use super::{Host, NixCommand, NixResult, NixError};
+use crate::util::CommandExt;
+use super::{Host, NixResult, NixError};
 
 /// A Nix store path.
 #[derive(Debug, Clone, Serialize, Deserialize)]

src/util.rs

@@ -1,12 +1,15 @@
+use std::convert::TryFrom;
 use std::path::PathBuf;
 use std::process::Stdio;
 
+use async_trait::async_trait;
 use clap::{App, Arg, ArgMatches};
 use futures::future::join3;
+use serde::de::DeserializeOwned;
 use tokio::io::{AsyncRead, AsyncBufReadExt, BufReader};
 use tokio::process::Command;
 
-use super::nix::{Flake, Hive, HivePath, NixResult};
+use super::nix::{Flake, Hive, HivePath, NixResult, NixError, StorePath};
 use super::nix::deployment::TargetNodeMap;
 use super::job::JobHandle;
 
@@ -19,6 +22,22 @@ pub struct CommandExecution {
     stderr: Option<String>,
 }
 
+/// Helper extensions for Commands.
+#[async_trait]
+pub trait CommandExt {
+    /// Runs the command with stdout and stderr passed through to the user.
+    async fn passthrough(&mut self) -> NixResult<()>;
+
+    /// Runs the command, capturing the output as a String.
+    async fn capture_output(&mut self) -> NixResult<String>;
+
+    /// Runs the command, capturing deserialized output from JSON.
+    async fn capture_json<T>(&mut self) -> NixResult<T> where T: DeserializeOwned;
+
+    /// Runs the command, capturing a single store path.
+    async fn capture_store_path(&mut self) -> NixResult<StorePath>;
+}
+
 impl CommandExecution {
     pub fn new(command: Command) -> Self {
         Self {
@@ -81,6 +100,86 @@ impl CommandExecution {
     }
 }
 
+#[async_trait]
+impl CommandExt for Command {
+    /// Runs the command with stdout and stderr passed through to the user.
+    async fn passthrough(&mut self) -> NixResult<()> {
+        let exit = self
+            .spawn()?
+            .wait()
+            .await?;
+
+        if exit.success() {
+            Ok(())
+        } else {
+            Err(exit.into())
+        }
+    }
+
+    /// Captures output as a String.
+    async fn capture_output(&mut self) -> NixResult<String> {
+        // We want the user to see the raw errors
+        let output = self
+            .stdout(Stdio::piped())
+            .stderr(Stdio::inherit())
+            .spawn()?
+            .wait_with_output()
+            .await?;
+
+        if output.status.success() {
+            // FIXME: unwrap
+            Ok(String::from_utf8(output.stdout).unwrap())
+        } else {
+            Err(output.status.into())
+        }
+    }
+
+    /// Captures deserialized output from JSON.
+    async fn capture_json<T>(&mut self) -> NixResult<T> where T: DeserializeOwned {
+        let output = self.capture_output().await?;
+        serde_json::from_str(&output).map_err(|_| NixError::BadOutput {
+            output: output.clone()
+        })
+    }
+
+    /// Captures a single store path.
+    async fn capture_store_path(&mut self) -> NixResult<StorePath> {
+        let output = self.capture_output().await?;
+        let path = output.trim_end().to_owned();
+        StorePath::try_from(path)
+    }
+}
+
+#[async_trait]
+impl CommandExt for CommandExecution {
+    async fn passthrough(&mut self) -> NixResult<()> {
+        self.run().await
+    }
+
+    /// Captures output as a String.
+    async fn capture_output(&mut self) -> NixResult<String> {
+        self.run().await?;
+        let (stdout, _) = self.get_logs();
+
+        Ok(stdout.unwrap().to_owned())
+    }
+
+    /// Captures deserialized output from JSON.
+    async fn capture_json<T>(&mut self) -> NixResult<T> where T: DeserializeOwned {
+        let output = self.capture_output().await?;
+        serde_json::from_str(&output).map_err(|_| NixError::BadOutput {
+            output: output.clone()
+        })
+    }
+
+    /// Captures a single store path.
+    async fn capture_store_path(&mut self) -> NixResult<StorePath> {
+        let output = self.capture_output().await?;
+        let path = output.trim_end().to_owned();
+        StorePath::try_from(path)
+    }
+}
+
 pub async fn hive_from_args(args: &ArgMatches) -> NixResult<Hive> {
     let path = match args.occurrences_of("config") {
         0 => {