Support different planners

src/cli/arg/plan_options.rs

@@ -1,4 +1,5 @@
 use clap::{ArgAction, Parser};
+use harmonic::Planner;
 
 /// Plan an install that can be repeated on an identical host later
 #[derive(Debug, Parser)]
@@ -38,4 +39,7 @@ pub(crate) struct PlanOptions {
         group = "plan_options"
     )]
     pub(crate) force: bool,
+    // Override the default planner for this OS/Architecture
+    #[clap(long, global = true, group = "plan_options", value_parser = clap::builder::EnumValueParser::<Planner>::new())]
+    pub(crate) planner: Option<Planner>,
 }

src/cli/subcommand/install.rs

@@ -2,7 +2,7 @@ use std::{path::PathBuf, process::ExitCode};
 
 use clap::{ArgAction, Parser};
 use eyre::{eyre, WrapErr};
-use harmonic::{InstallPlan, InstallSettings};
+use harmonic::{InstallPlan, InstallSettings, Planner};
 
 use crate::{
     cli::{
@@ -69,7 +69,12 @@ impl CommandExecute for Install {
                 );
                 settings.modify_profile(!plan_options.no_modify_profile);
 
-                InstallPlan::new(settings).await?
+                let planner = match plan_options.planner {
+                    Some(planner) => planner,
+                    None => Planner::default()?,
+                };
+
+                InstallPlan::new(planner, settings).await?
             },
         };
 

src/cli/subcommand/plan.rs

@@ -1,7 +1,7 @@
 use std::{path::PathBuf, process::ExitCode};
 
 use clap::Parser;
-use harmonic::{InstallPlan, InstallSettings};
+use harmonic::{InstallPlan, InstallSettings, Planner};
 
 use eyre::WrapErr;
 
@@ -34,6 +34,7 @@ impl CommandExecute for Plan {
                     no_modify_profile,
                     daemon_user_count,
                     force,
+                    planner,
                 },
             plan,
         } = self;
@@ -49,7 +50,12 @@ impl CommandExecute for Plan {
         );
         settings.modify_profile(!no_modify_profile);
 
-        let install_plan = InstallPlan::new(settings).await?;
+        let planner = match planner {
+            Some(planner) => planner,
+            None => Planner::default()?,
+        };
+
+        let install_plan = InstallPlan::new(planner, settings).await?;
 
         let json = serde_json::to_string_pretty(&install_plan)?;
         tokio::fs::write(plan, json)

src/lib.rs

@@ -1,12 +1,14 @@
 mod actions;
 mod error;
 mod plan;
+mod planner;
 mod settings;
 
 use std::{ffi::OsStr, fmt::Display, process::ExitStatus};
 
 pub use error::HarmonicError;
 pub use plan::InstallPlan;
+pub use planner::Planner;
 use serde::Serializer;
 pub use settings::InstallSettings;
 

src/plan.rs

@@ -5,41 +5,32 @@ use crate::{
         meta::{ConfigureNix, ProvisionNix, StartNixDaemon},
         Action, ActionDescription, ActionError, Actionable,
     },
+    planner::PlannerError,
     settings::InstallSettings,
-    HarmonicError,
+    HarmonicError, Planner,
 };
 
 #[derive(Debug, serde::Deserialize, serde::Serialize, Clone)]
 pub struct InstallPlan {
-    settings: InstallSettings,
+    pub(crate) settings: InstallSettings,
 
-    actions: Vec<Action>,
+    pub(crate) actions: Vec<Action>,
+
+    pub(crate) planner: Planner,
 }
 
 impl InstallPlan {
-    pub async fn new(settings: InstallSettings) -> Result<Self, HarmonicError> {
+    pub async fn new(planner: Planner, settings: InstallSettings) -> Result<Self, PlannerError> {
-        Ok(Self {
+        planner.plan(settings).await
-            settings: settings.clone(),
-            actions: vec![
-                ProvisionNix::plan(settings.clone())
-                    .await
-                    .map(Action::from)
-                    .map_err(ActionError::from)?,
-                ConfigureNix::plan(settings)
-                    .await
-                    .map(Action::from)
-                    .map_err(ActionError::from)?,
-                StartNixDaemon::plan()
-                    .await
-                    .map(Action::from)
-                    .map_err(ActionError::from)?,
-            ],
-        })
     }
 
     #[tracing::instrument(skip_all)]
     pub fn describe_execute(&self, explain: bool) -> String {
-        let Self { settings, actions } = self;
+        let Self {
+            planner,
+            settings,
+            actions,
+        } = self;
         format!(
             "\
             This Nix install is for:\n\
@@ -47,6 +38,8 @@ impl InstallPlan {
               Init system: {init_type}\n\
               Nix channels: {nix_channels}\n\
             \n\
+            Created by planner: {planner:?}
+            \n\
             The following actions will be taken:\n\
             {actions}
         ",
@@ -87,6 +80,7 @@ impl InstallPlan {
         let Self {
             actions,
             settings: _,
+            planner: _,
         } = self;
 
         // This is **deliberately sequential**.
@@ -104,7 +98,11 @@ impl InstallPlan {
 
     #[tracing::instrument(skip_all)]
     pub fn describe_revert(&self, explain: bool) -> String {
-        let Self { settings, actions } = self;
+        let Self {
+            planner,
+            settings,
+            actions,
+        } = self;
         format!(
             "\
             This Nix uninstall is for:\n\
@@ -112,6 +110,8 @@ impl InstallPlan {
               Init system: {init_type}\n\
               Nix channels: {nix_channels}\n\
             \n\
+            Created by planner: {planner:?}
+            \n\
             The following actions will be taken:\n\
             {actions}
         ",
@@ -152,6 +152,7 @@ impl InstallPlan {
         let Self {
             actions,
             settings: _,
+            planner: _,
         } = self;
 
         // This is **deliberately sequential**.

src/planner/darwin/mod.rs

@@ -0,0 +1,3 @@
+mod multi_user;
+
+pub use multi_user::DarwinMultiUser;

src/planner/darwin/multi_user.rs

@@ -0,0 +1,22 @@
+use crate::{planner::Plannable, Planner};
+
+#[derive(Debug, Clone, serde::Serialize, serde::Deserialize, Default)]
+pub struct DarwinMultiUser;
+
+#[async_trait::async_trait]
+impl Plannable for DarwinMultiUser {
+    const DISPLAY_STRING: &'static str = "Darwin Multi-User";
+    const SLUG: &'static str = "darwin-multi";
+
+    async fn plan(
+        settings: crate::InstallSettings,
+    ) -> Result<crate::InstallPlan, crate::planner::PlannerError> {
+        todo!()
+    }
+}
+
+impl Into<Planner> for DarwinMultiUser {
+    fn into(self) -> Planner {
+        Planner::DarwinMultiUser
+    }
+}

src/planner/linux/mod.rs

@@ -0,0 +1,3 @@
+mod multi_user;
+
+pub use multi_user::LinuxMultiUser;

src/planner/linux/multi_user.rs

@@ -0,0 +1,44 @@
+use crate::{
+    actions::{
+        meta::{ConfigureNix, ProvisionNix, StartNixDaemon},
+        Action, ActionError,
+    },
+    planner::{Plannable, PlannerError},
+    InstallPlan, InstallSettings, Planner,
+};
+
+#[derive(Debug, Clone, serde::Serialize, serde::Deserialize, Default)]
+pub struct LinuxMultiUser;
+
+#[async_trait::async_trait]
+impl Plannable for LinuxMultiUser {
+    const DISPLAY_STRING: &'static str = "Linux Multi-User";
+    const SLUG: &'static str = "linux-multi";
+
+    async fn plan(settings: InstallSettings) -> Result<InstallPlan, PlannerError> {
+        Ok(InstallPlan {
+            planner: Self.into(),
+            settings: settings.clone(),
+            actions: vec![
+                ProvisionNix::plan(settings.clone())
+                    .await
+                    .map(Action::from)
+                    .map_err(ActionError::from)?,
+                ConfigureNix::plan(settings)
+                    .await
+                    .map(Action::from)
+                    .map_err(ActionError::from)?,
+                StartNixDaemon::plan()
+                    .await
+                    .map(Action::from)
+                    .map_err(ActionError::from)?,
+            ],
+        })
+    }
+}
+
+impl Into<Planner> for LinuxMultiUser {
+    fn into(self) -> Planner {
+        Planner::LinuxMultiUser
+    }
+}

src/planner/mod.rs

@@ -0,0 +1,61 @@
+mod darwin;
+mod linux;
+mod specific;
+
+use std::{ffi::OsStr, str::FromStr};
+
+use crate::{actions::ActionError, HarmonicError, InstallPlan, InstallSettings};
+
+#[derive(Debug, Clone, clap::ValueEnum, serde::Serialize, serde::Deserialize)]
+pub enum Planner {
+    LinuxMultiUser,
+    DarwinMultiUser,
+    SteamDeck,
+}
+
+impl Planner {
+    pub fn possible_values() -> &'static [Planner] {
+        &[Self::LinuxMultiUser, Self::DarwinMultiUser, Self::SteamDeck]
+    }
+    pub fn default() -> Result<Self, PlannerError> {
+        use target_lexicon::{Architecture, OperatingSystem};
+        match (Architecture::host(), OperatingSystem::host()) {
+            (Architecture::X86_64, OperatingSystem::Linux) => Ok(Self::LinuxMultiUser),
+            (Architecture::Aarch64(_), OperatingSystem::Linux) => Ok(Self::LinuxMultiUser),
+            (Architecture::X86_64, OperatingSystem::MacOSX { .. }) => Ok(Self::DarwinMultiUser),
+            (Architecture::Aarch64(_), OperatingSystem::MacOSX { .. }) => Ok(Self::DarwinMultiUser),
+            _ => Err(PlannerError::UnsupportedArchitecture(target_lexicon::HOST)),
+        }
+    }
+
+    pub async fn plan(self, settings: InstallSettings) -> Result<InstallPlan, PlannerError> {
+        match self {
+            Planner::LinuxMultiUser => linux::LinuxMultiUser::plan(settings).await,
+            Planner::DarwinMultiUser => darwin::DarwinMultiUser::plan(settings).await,
+            Planner::SteamDeck => specific::SteamDeck::plan(settings).await,
+        }
+    }
+}
+
+#[async_trait::async_trait]
+trait Plannable: Into<Planner>
+where
+    Self: Sized,
+{
+    const DISPLAY_STRING: &'static str;
+    const SLUG: &'static str;
+
+    async fn plan(settings: InstallSettings) -> Result<InstallPlan, PlannerError>;
+}
+
+#[derive(thiserror::Error, Debug)]
+pub enum PlannerError {
+    #[error("Harmonic does not have a default planner for the `{0}` architecture right now, pass a specific archetype")]
+    UnsupportedArchitecture(target_lexicon::Triple),
+    #[error("Error executing action")]
+    ActionError(
+        #[source]
+        #[from]
+        ActionError,
+    ),
+}

src/planner/specific/mod.rs

@@ -0,0 +1,3 @@
+mod steam_deck;
+
+pub use steam_deck::SteamDeck;

src/planner/specific/steam_deck.rs

@@ -0,0 +1,22 @@
+use crate::{planner::Plannable, Planner};
+
+#[derive(Debug, Clone, serde::Serialize, serde::Deserialize, Default)]
+pub struct SteamDeck;
+
+#[async_trait::async_trait]
+impl Plannable for SteamDeck {
+    const DISPLAY_STRING: &'static str = "Steam Deck (x86_64 Linux Multi-User)";
+    const SLUG: &'static str = "steam-deck";
+
+    async fn plan(
+        settings: crate::InstallSettings,
+    ) -> Result<crate::InstallPlan, crate::planner::PlannerError> {
+        todo!()
+    }
+}
+
+impl Into<Planner> for SteamDeck {
+    fn into(self) -> Planner {
+        Planner::SteamDeck
+    }
+}

src/settings.rs

@@ -1,3 +1,4 @@
+use crate::{planner, Planner};
 use target_lexicon::Triple;
 use url::Url;
 
@@ -115,4 +116,10 @@ impl InstallSettings {
 pub enum InstallSettingsError {
     #[error("Harmonic does not support the `{0}` architecture right now")]
     UnsupportedArchitecture(target_lexicon::Triple),
+    #[error("Planner error")]
+    Planner(
+        #[source]
+        #[from]
+        planner::PlannerError,
+    ),
 }