Merge branch 'master' into notgne2/document-hostname-dot

2 files changed, 1031 insertions, 0 deletions

diff --git a/src/bin/activate.rs b/src/bin/activate.rs
new file mode 100644
index 0000000..2f13b44
--- /dev/null
+++ b/src/bin/activate.rs
@@ -0,0 +1,470 @@
+// SPDX-FileCopyrightText: 2020 Serokell <https://serokell.io/>
+// SPDX-FileCopyrightText: 2020 Andreas Fuchs <asf@boinkor.net>
+//
+// SPDX-License-Identifier: MPL-2.0
+
+use signal_hook::{consts::signal::SIGHUP, iterator::Signals};
+
+use clap::Clap;
+
+use tokio::fs;
+use tokio::process::Command;
+use tokio::sync::mpsc;
+use tokio::time::timeout;
+
+use std::time::Duration;
+
+use std::path::Path;
+
+use notify::{RecommendedWatcher, RecursiveMode, Watcher};
+
+use thiserror::Error;
+
+#[macro_use]
+extern crate log;
+
+extern crate serde_derive;
+
+/// Remote activation utility for deploy-rs
+#[derive(Clap, Debug)]
+#[clap(version = "1.0", author = "Serokell <https://serokell.io/>")]
+struct Opts {
+    /// Print debug logs to output
+    #[clap(short, long)]
+    debug_logs: bool,
+    /// Directory to print logs to
+    #[clap(long)]
+    log_dir: Option<String>,
+
+    /// Path for any temporary files that may be needed during activation
+    #[clap(long)]
+    temp_path: String,
+
+    #[clap(subcommand)]
+    subcmd: SubCommand,
+}
+
+#[derive(Clap, Debug)]
+enum SubCommand {
+    Activate(ActivateOpts),
+    Wait(WaitOpts),
+}
+
+/// Activate a profile
+#[derive(Clap, Debug)]
+struct ActivateOpts {
+    /// The closure to activate
+    closure: String,
+    /// The profile path to install into
+    profile_path: String,
+
+    /// Maximum time to wait for confirmation after activation
+    #[clap(long)]
+    confirm_timeout: u16,
+
+    /// Wait for confirmation after deployment and rollback if not confirmed
+    #[clap(long)]
+    magic_rollback: bool,
+
+    /// Auto rollback if failure
+    #[clap(long)]
+    auto_rollback: bool,
+}
+
+/// Activate a profile
+#[derive(Clap, Debug)]
+struct WaitOpts {
+    /// The closure to wait for
+    closure: String,
+}
+
+#[derive(Error, Debug)]
+pub enum DeactivateError {
+    #[error("Failed to execute the rollback command: {0}")]
+    RollbackError(std::io::Error),
+    #[error("The rollback resulted in a bad exit code: {0:?}")]
+    RollbackExitError(Option<i32>),
+    #[error("Failed to run command for listing generations: {0}")]
+    ListGenError(std::io::Error),
+    #[error("Command for listing generations resulted in a bad exit code: {0:?}")]
+    ListGenExitError(Option<i32>),
+    #[error("Error converting generation list output to utf8: {0}")]
+    DecodeListGenUtf8Error(#[from] std::string::FromUtf8Error),
+    #[error("Failed to run command for deleting generation: {0}")]
+    DeleteGenError(std::io::Error),
+    #[error("Command for deleting generations resulted in a bad exit code: {0:?}")]
+    DeleteGenExitError(Option<i32>),
+    #[error("Failed to run command for re-activating the last generation: {0}")]
+    ReactivateError(std::io::Error),
+    #[error("Command for re-activating the last generation resulted in a bad exit code: {0:?}")]
+    ReactivateExitError(Option<i32>),
+}
+
+pub async fn deactivate(profile_path: &str) -> Result<(), DeactivateError> {
+    warn!("De-activating due to error");
+
+    let nix_env_rollback_exit_status = Command::new("nix-env")
+        .arg("-p")
+        .arg(&profile_path)
+        .arg("--rollback")
+        .status()
+        .await
+        .map_err(DeactivateError::RollbackError)?;
+
+    match nix_env_rollback_exit_status.code() {
+        Some(0) => (),
+        a => return Err(DeactivateError::RollbackExitError(a)),
+    };
+
+    debug!("Listing generations");
+
+    let nix_env_list_generations_out = Command::new("nix-env")
+        .arg("-p")
+        .arg(&profile_path)
+        .arg("--list-generations")
+        .output()
+        .await
+        .map_err(DeactivateError::ListGenError)?;
+
+    match nix_env_list_generations_out.status.code() {
+        Some(0) => (),
+        a => return Err(DeactivateError::ListGenExitError(a)),
+    };
+
+    let generations_list = String::from_utf8(nix_env_list_generations_out.stdout)?;
+
+    let last_generation_line = generations_list
+        .lines()
+        .last()
+        .expect("Expected to find a generation in list");
+
+    let last_generation_id = last_generation_line
+        .split_whitespace()
+        .next()
+        .expect("Expected to get ID from generation entry");
+
+    debug!("Removing generation entry {}", last_generation_line);
+    warn!("Removing generation by ID {}", last_generation_id);
+
+    let nix_env_delete_generation_exit_status = Command::new("nix-env")
+        .arg("-p")
+        .arg(&profile_path)
+        .arg("--delete-generations")
+        .arg(last_generation_id)
+        .status()
+        .await
+        .map_err(DeactivateError::DeleteGenError)?;
+
+    match nix_env_delete_generation_exit_status.code() {
+        Some(0) => (),
+        a => return Err(DeactivateError::DeleteGenExitError(a)),
+    };
+
+    info!("Attempting to re-activate the last generation");
+
+    let re_activate_exit_status = Command::new(format!("{}/deploy-rs-activate", profile_path))
+        .env("PROFILE", &profile_path)
+        .current_dir(&profile_path)
+        .status()
+        .await
+        .map_err(DeactivateError::ReactivateError)?;
+
+    match re_activate_exit_status.code() {
+        Some(0) => (),
+        a => return Err(DeactivateError::ReactivateExitError(a)),
+    };
+
+    Ok(())
+}
+
+#[derive(Error, Debug)]
+pub enum ActivationConfirmationError {
+    #[error("Failed to create activation confirmation directory: {0}")]
+    CreateConfirmDirError(std::io::Error),
+    #[error("Failed to create activation confirmation file: {0}")]
+    CreateConfirmFileError(std::io::Error),
+    #[error("Failed to create file system watcher instance: {0}")]
+    CreateWatcherError(notify::Error),
+    #[error("Error forking process: {0}")]
+    ForkError(i32),
+    #[error("Could not watch for activation sentinel: {0}")]
+    WatcherError(#[from] notify::Error),
+}
+
+#[derive(Error, Debug)]
+pub enum DangerZoneError {
+    #[error("Timeout elapsed for confirmation")]
+    TimesUp,
+    #[error("inotify stream ended without activation confirmation")]
+    NoConfirmation,
+    #[error("inotify encountered an error: {0}")]
+    WatchError(notify::Error),
+}
+
+async fn danger_zone(
+    mut events: mpsc::Receiver<Result<(), notify::Error>>,
+    confirm_timeout: u16,
+) -> Result<(), DangerZoneError> {
+    info!("Waiting for confirmation event...");
+
+    match timeout(Duration::from_secs(confirm_timeout as u64), events.recv()).await {
+        Ok(Some(Ok(()))) => Ok(()),
+        Ok(Some(Err(e))) => Err(DangerZoneError::WatchError(e)),
+        Ok(None) => Err(DangerZoneError::NoConfirmation),
+        Err(_) => Err(DangerZoneError::TimesUp),
+    }
+}
+
+pub async fn activation_confirmation(
+    profile_path: String,
+    temp_path: String,
+    confirm_timeout: u16,
+    closure: String,
+) -> Result<(), ActivationConfirmationError> {
+    let lock_path = deploy::make_lock_path(&temp_path, &closure);
+
+    debug!("Ensuring parent directory exists for canary file");
+
+    if let Some(parent) = Path::new(&lock_path).parent() {
+        fs::create_dir_all(parent)
+            .await
+            .map_err(ActivationConfirmationError::CreateConfirmDirError)?;
+    }
+
+    debug!("Creating canary file");
+
+    fs::File::create(&lock_path)
+        .await
+        .map_err(ActivationConfirmationError::CreateConfirmFileError)?;
+
+    debug!("Creating notify watcher");
+
+    let (deleted, done) = mpsc::channel(1);
+
+    let mut watcher: RecommendedWatcher =
+        Watcher::new_immediate(move |res: Result<notify::event::Event, notify::Error>| {
+            let send_result = match res {
+                Ok(e) if e.kind == notify::EventKind::Remove(notify::event::RemoveKind::File) => {
+                    debug!("Got worthy removal event, sending on channel");
+                    deleted.try_send(Ok(()))
+                }
+                Err(e) => {
+                    debug!("Got error waiting for removal event, sending on channel");
+                    deleted.try_send(Err(e))
+                }
+                Ok(_) => Ok(()), // ignore non-removal events
+            };
+
+            if let Err(e) = send_result {
+                error!("Could not send file system event to watcher: {}", e);
+            }
+        })?;
+
+    watcher.watch(&lock_path, RecursiveMode::NonRecursive)?;
+
+    if let Err(err) = danger_zone(done, confirm_timeout).await {
+        error!("Error waiting for confirmation event: {}", err);
+
+        if let Err(err) = deactivate(&profile_path).await {
+            error!(
+                "Error de-activating due to another error waiting for confirmation, oh no...: {}",
+                err
+            );
+        }
+    }
+
+    Ok(())
+}
+
+#[derive(Error, Debug)]
+pub enum WaitError {
+    #[error("Error creating watcher for activation: {0}")]
+    Watcher(#[from] notify::Error),
+    #[error("Error waiting for activation: {0}")]
+    Waiting(#[from] DangerZoneError),
+}
+pub async fn wait(temp_path: String, closure: String) -> Result<(), WaitError> {
+    let lock_path = deploy::make_lock_path(&temp_path, &closure);
+
+    let (created, done) = mpsc::channel(1);
+
+    let mut watcher: RecommendedWatcher = {
+        // TODO: fix wasteful clone
+        let lock_path = lock_path.clone();
+
+        Watcher::new_immediate(move |res: Result<notify::event::Event, notify::Error>| {
+            let send_result = match res {
+                Ok(e) if e.kind == notify::EventKind::Create(notify::event::CreateKind::File) => {
+                    match &e.paths[..] {
+                        [x] if x == Path::new(&lock_path) => created.try_send(Ok(())),
+                        _ => Ok(()),
+                    }
+                }
+                Err(e) => created.try_send(Err(e)),
+                Ok(_) => Ok(()), // ignore non-removal events
+            };
+
+            if let Err(e) = send_result {
+                error!("Could not send file system event to watcher: {}", e);
+            }
+        })?
+    };
+
+    watcher.watch(&temp_path, RecursiveMode::NonRecursive)?;
+
+    // Avoid a potential race condition by checking for existence after watcher creation
+    if fs::metadata(&lock_path).await.is_ok() {
+        watcher.unwatch(&temp_path)?;
+        return Ok(());
+    }
+
+    danger_zone(done, 240).await?;
+
+    info!("Found canary file, done waiting!");
+
+    Ok(())
+}
+
+#[derive(Error, Debug)]
+pub enum ActivateError {
+    #[error("Failed to execute the command for setting profile: {0}")]
+    SetProfileError(std::io::Error),
+    #[error("The command for setting profile resulted in a bad exit code: {0:?}")]
+    SetProfileExitError(Option<i32>),
+
+    #[error("Failed to execute the activation script: {0}")]
+    RunActivateError(std::io::Error),
+    #[error("The activation script resulted in a bad exit code: {0:?}")]
+    RunActivateExitError(Option<i32>),
+
+    #[error("There was an error de-activating after an error was encountered: {0}")]
+    DeactivateError(#[from] DeactivateError),
+
+    #[error("Failed to get activation confirmation: {0}")]
+    ActivationConfirmationError(#[from] ActivationConfirmationError),
+}
+
+pub async fn activate(
+    profile_path: String,
+    closure: String,
+    auto_rollback: bool,
+    temp_path: String,
+    confirm_timeout: u16,
+    magic_rollback: bool,
+) -> Result<(), ActivateError> {
+    info!("Activating profile");
+
+    let nix_env_set_exit_status = Command::new("nix-env")
+        .arg("-p")
+        .arg(&profile_path)
+        .arg("--set")
+        .arg(&closure)
+        .status()
+        .await
+        .map_err(ActivateError::SetProfileError)?;
+
+    match nix_env_set_exit_status.code() {
+        Some(0) => (),
+        a => {
+            if auto_rollback {
+                deactivate(&profile_path).await?;
+            }
+            return Err(ActivateError::SetProfileExitError(a));
+        }
+    };
+
+    debug!("Running activation script");
+
+    let activate_status = match Command::new(format!("{}/deploy-rs-activate", profile_path))
+        .env("PROFILE", &profile_path)
+        .current_dir(&profile_path)
+        .status()
+        .await
+        .map_err(ActivateError::RunActivateError)
+    {
+        Ok(x) => x,
+        Err(e) => {
+            if auto_rollback {
+                deactivate(&profile_path).await?;
+            }
+            return Err(e);
+        }
+    };
+
+    match activate_status.code() {
+        Some(0) => (),
+        a => {
+            if auto_rollback {
+                deactivate(&profile_path).await?;
+            }
+            return Err(ActivateError::RunActivateExitError(a));
+        }
+    };
+
+    info!("Activation succeeded!");
+
+    if magic_rollback {
+        info!("Magic rollback is enabled, setting up confirmation hook...");
+
+        match activation_confirmation(profile_path.clone(), temp_path, confirm_timeout, closure)
+            .await
+        {
+            Ok(()) => {}
+            Err(err) => {
+                deactivate(&profile_path).await?;
+                return Err(ActivateError::ActivationConfirmationError(err));
+            }
+        };
+    }
+
+    Ok(())
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    // Ensure that this process stays alive after the SSH connection dies
+    let mut signals = Signals::new(&[SIGHUP])?;
+    std::thread::spawn(move || {
+        for _ in signals.forever() {
+            println!("Received NOHUP - ignoring...");
+        }
+    });
+
+    let opts: Opts = Opts::parse();
+
+    deploy::init_logger(
+        opts.debug_logs,
+        opts.log_dir.as_deref(),
+        match opts.subcmd {
+            SubCommand::Activate(_) => deploy::LoggerType::Activate,
+            SubCommand::Wait(_) => deploy::LoggerType::Wait,
+        },
+    )?;
+
+    let r = match opts.subcmd {
+        SubCommand::Activate(activate_opts) => activate(
+            activate_opts.profile_path,
+            activate_opts.closure,
+            activate_opts.auto_rollback,
+            opts.temp_path,
+            activate_opts.confirm_timeout,
+            activate_opts.magic_rollback,
+        )
+        .await
+        .map_err(|x| Box::new(x) as Box<dyn std::error::Error>),
+
+        SubCommand::Wait(wait_opts) => wait(opts.temp_path, wait_opts.closure)
+            .await
+            .map_err(|x| Box::new(x) as Box<dyn std::error::Error>),
+    };
+
+    match r {
+        Ok(()) => (),
+        Err(err) => {
+            error!("{}", err);
+            std::process::exit(1)
+        }
+    }
+
+    Ok(())
+}
diff --git a/src/bin/deploy.rs b/src/bin/deploy.rs
new file mode 100644
index 0000000..caf3d4e
--- /dev/null
+++ b/src/bin/deploy.rs
@@ -0,0 +1,561 @@
+// SPDX-FileCopyrightText: 2020 Serokell <https://serokell.io/>
+//
+// SPDX-License-Identifier: MPL-2.0
+
+use std::collections::HashMap;
+use std::io::{stdin, stdout, Write};
+
+use clap::Clap;
+
+use std::process::Stdio;
+use tokio::process::Command;
+
+use thiserror::Error;
+
+#[macro_use]
+extern crate log;
+
+#[macro_use]
+extern crate serde_derive;
+
+/// Simple Rust rewrite of a simple Nix Flake deployment tool
+#[derive(Clap, Debug)]
+#[clap(version = "1.0", author = "Serokell <https://serokell.io/>")]
+struct Opts {
+    /// The flake to deploy
+    #[clap(default_value = ".")]
+    flake: String,
+    /// Check signatures when using `nix copy`
+    #[clap(short, long)]
+    checksigs: bool,
+    /// Use the interactive prompt before deployment
+    #[clap(short, long)]
+    interactive: bool,
+    /// Extra arguments to be passed to nix build
+    extra_build_args: Vec<String>,
+
+    /// Print debug logs to output
+    #[clap(short, long)]
+    debug_logs: bool,
+    /// Directory to print logs to (including the background activation process)
+    #[clap(long)]
+    log_dir: Option<String>,
+
+    /// Keep the build outputs of each built profile
+    #[clap(short, long)]
+    keep_result: bool,
+    /// Location to keep outputs from built profiles in
+    #[clap(short, long)]
+    result_path: Option<String>,
+
+    /// Skip the automatic pre-build checks
+    #[clap(short, long)]
+    skip_checks: bool,
+
+    /// Override the SSH user with the given value
+    #[clap(long)]
+    ssh_user: Option<String>,
+    /// Override the profile user with the given value
+    #[clap(long)]
+    profile_user: Option<String>,
+    /// Override the SSH options used
+    #[clap(long)]
+    ssh_opts: Option<String>,
+    /// Override if the connecting to the target node should be considered fast
+    #[clap(long)]
+    fast_connection: Option<bool>,
+    /// Override if a rollback should be attempted if activation fails
+    #[clap(long)]
+    auto_rollback: Option<bool>,
+    /// Override hostname used for the node
+    #[clap(long)]
+    hostname: Option<String>,
+    /// Make activation wait for confirmation, or roll back after a period of time
+    #[clap(long)]
+    magic_rollback: Option<bool>,
+    /// How long activation should wait for confirmation (if using magic-rollback)
+    #[clap(long)]
+    confirm_timeout: Option<u16>,
+    /// Where to store temporary files (only used by magic-rollback)
+    #[clap(long)]
+    temp_path: Option<String>,
+}
+
+/// Returns if the available Nix installation supports flakes
+async fn test_flake_support() -> Result<bool, std::io::Error> {
+    debug!("Checking for flake support");
+
+    Ok(Command::new("nix")
+        .arg("eval")
+        .arg("--expr")
+        .arg("builtins.getFlake")
+        // This will error on some machines "intentionally", and we don't really need that printing
+        .stdout(Stdio::null())
+        .stderr(Stdio::null())
+        .status()
+        .await?
+        .success())
+}
+
+#[derive(Error, Debug)]
+enum CheckDeploymentError {
+    #[error("Failed to execute Nix checking command: {0}")]
+    NixCheck(#[from] std::io::Error),
+    #[error("Nix checking command resulted in a bad exit code: {0:?}")]
+    NixCheckExit(Option<i32>),
+}
+
+async fn check_deployment(
+    supports_flakes: bool,
+    repo: &str,
+    extra_build_args: &[String],
+) -> Result<(), CheckDeploymentError> {
+    info!("Running checks for flake in {}", repo);
+
+    let mut c = match supports_flakes {
+        true => Command::new("nix"),
+        false => Command::new("nix-build"),
+    };
+
+    let mut check_command = match supports_flakes {
+        true => {
+            c.arg("flake")
+                .arg("check")
+                .arg(repo)
+        }
+        false => {
+            c.arg("-E")
+                .arg("--no-out-link")
+                .arg(format!("let r = import {}/.; x = (if builtins.isFunction r then (r {{}}) else r); in if x ? checks then x.checks.${{builtins.currentSystem}} else {{}}", repo))
+        }
+    };
+
+    for extra_arg in extra_build_args {
+        check_command = check_command.arg(extra_arg);
+    }
+
+    let check_status = check_command.status().await?;
+
+    match check_status.code() {
+        Some(0) => (),
+        a => return Err(CheckDeploymentError::NixCheckExit(a)),
+    };
+
+    Ok(())
+}
+
+#[derive(Error, Debug)]
+enum GetDeploymentDataError {
+    #[error("Failed to execute nix eval command: {0}")]
+    NixEval(std::io::Error),
+    #[error("Failed to read output from evaluation: {0}")]
+    NixEvalOut(std::io::Error),
+    #[error("Evaluation resulted in a bad exit code: {0:?}")]
+    NixEvalExit(Option<i32>),
+    #[error("Error converting evaluation output to utf8: {0}")]
+    DecodeUtf8(#[from] std::string::FromUtf8Error),
+    #[error("Error decoding the JSON from evaluation: {0}")]
+    DecodeJson(#[from] serde_json::error::Error),
+}
+
+/// Evaluates the Nix in the given `repo` and return the processed Data from it
+async fn get_deployment_data(
+    supports_flakes: bool,
+    repo: &str,
+    extra_build_args: &[String],
+) -> Result<deploy::data::Data, GetDeploymentDataError> {
+    info!("Evaluating flake in {}", repo);
+
+    let mut c = match supports_flakes {
+        true => Command::new("nix"),
+        false => Command::new("nix-instantiate"),
+    };
+
+    let mut build_command = match supports_flakes {
+        true => {
+            c.arg("eval")
+            .arg("--json")
+            .arg(format!("{}#deploy", repo))
+        }
+        false => {
+            c
+                .arg("--strict")
+                .arg("--read-write-mode")
+                .arg("--json")
+                .arg("--eval")
+                .arg("-E")
+                .arg(format!("let r = import {}/.; in if builtins.isFunction r then (r {{}}).deploy else r.deploy", repo))
+        }
+    };
+
+    for extra_arg in extra_build_args {
+        build_command = build_command.arg(extra_arg);
+    }
+
+    let build_child = build_command
+        .stdout(Stdio::piped())
+        .spawn()
+        .map_err(GetDeploymentDataError::NixEval)?;
+
+    let build_output = build_child
+        .wait_with_output()
+        .await
+        .map_err(GetDeploymentDataError::NixEvalOut)?;
+
+    match build_output.status.code() {
+        Some(0) => (),
+        a => return Err(GetDeploymentDataError::NixEvalExit(a)),
+    };
+
+    let data_json = String::from_utf8(build_output.stdout)?;
+
+    Ok(serde_json::from_str(&data_json)?)
+}
+
+#[derive(Serialize)]
+struct PromptPart<'a> {
+    user: &'a str,
+    ssh_user: &'a str,
+    path: &'a str,
+    hostname: &'a str,
+    ssh_opts: &'a [String],
+}
+
+fn print_deployment(
+    parts: &[(deploy::DeployData, deploy::DeployDefs)],
+) -> Result<(), toml::ser::Error> {
+    let mut part_map: HashMap<String, HashMap<String, PromptPart>> = HashMap::new();
+
+    for (data, defs) in parts {
+        part_map
+            .entry(data.node_name.to_string())
+            .or_insert_with(HashMap::new)
+            .insert(
+                data.profile_name.to_string(),
+                PromptPart {
+                    user: &defs.profile_user,
+                    ssh_user: &defs.ssh_user,
+                    path: &data.profile.profile_settings.path,
+                    hostname: &data.node.node_settings.hostname,
+                    ssh_opts: &data.merged_settings.ssh_opts,
+                },
+            );
+    }
+
+    let toml = toml::to_string(&part_map)?;
+
+    info!("The following profiles are going to be deployed:\n{}", toml);
+
+    Ok(())
+}
+#[derive(Error, Debug)]
+enum PromptDeploymentError {
+    #[error("Failed to make printable TOML of deployment: {0}")]
+    TomlFormat(#[from] toml::ser::Error),
+    #[error("Failed to flush stdout prior to query: {0}")]
+    StdoutFlush(std::io::Error),
+    #[error("Failed to read line from stdin: {0}")]
+    StdinRead(std::io::Error),
+    #[error("User cancelled deployment")]
+    Cancelled,
+}
+
+fn prompt_deployment(
+    parts: &[(deploy::DeployData, deploy::DeployDefs)],
+) -> Result<(), PromptDeploymentError> {
+    print_deployment(parts)?;
+
+    info!("Are you sure you want to deploy these profiles?");
+    print!("> ");
+
+    stdout()
+        .flush()
+        .map_err(PromptDeploymentError::StdoutFlush)?;
+
+    let mut s = String::new();
+    stdin()
+        .read_line(&mut s)
+        .map_err(PromptDeploymentError::StdinRead)?;
+
+    if !yn::yes(&s) {
+        if yn::is_somewhat_yes(&s) {
+            info!("Sounds like you might want to continue, to be more clear please just say \"yes\". Do you want to deploy these profiles?");
+            print!("> ");
+
+            stdout()
+                .flush()
+                .map_err(PromptDeploymentError::StdoutFlush)?;
+
+            let mut s = String::new();
+            stdin()
+                .read_line(&mut s)
+                .map_err(PromptDeploymentError::StdinRead)?;
+
+            if !yn::yes(&s) {
+                return Err(PromptDeploymentError::Cancelled);
+            }
+        } else {
+            if !yn::no(&s) {
+                info!(
+                    "That was unclear, but sounded like a no to me. Please say \"yes\" or \"no\" to be more clear."
+                );
+            }
+
+            return Err(PromptDeploymentError::Cancelled);
+        }
+    }
+
+    Ok(())
+}
+
+#[derive(Error, Debug)]
+enum RunDeployError {
+    #[error("Failed to deploy profile: {0}")]
+    DeployProfile(#[from] deploy::deploy::DeployProfileError),
+    #[error("Failed to push profile: {0}")]
+    PushProfile(#[from] deploy::push::PushProfileError),
+    #[error("No profile named `{0}` was found")]
+    ProfileNotFound(String),
+    #[error("No node named `{0}` was found")]
+    NodeNotFound(String),
+    #[error("Profile was provided without a node name")]
+    ProfileWithoutNode,
+    #[error("Error processing deployment definitions: {0}")]
+    DeployDataDefs(#[from] deploy::DeployDataDefsError),
+    #[error("Failed to make printable TOML of deployment: {0}")]
+    TomlFormat(#[from] toml::ser::Error),
+    #[error("{0}")]
+    PromptDeployment(#[from] PromptDeploymentError),
+}
+
+type ToDeploy<'a> = Vec<(
+    (&'a str, &'a deploy::data::Node),
+    (&'a str, &'a deploy::data::Profile),
+)>;
+
+async fn run_deploy(
+    deploy_flake: deploy::DeployFlake<'_>,
+    data: deploy::data::Data,
+    supports_flakes: bool,
+    check_sigs: bool,
+    interactive: bool,
+    cmd_overrides: deploy::CmdOverrides,
+    keep_result: bool,
+    result_path: Option<&str>,
+    extra_build_args: &[String],
+    debug_logs: bool,
+    log_dir: Option<String>,
+) -> Result<(), RunDeployError> {
+    let to_deploy: ToDeploy = match (&deploy_flake.node, &deploy_flake.profile) {
+        (Some(node_name), Some(profile_name)) => {
+            let node = match data.nodes.get(node_name) {
+                Some(x) => x,
+                None => return Err(RunDeployError::NodeNotFound(node_name.to_owned())),
+            };
+            let profile = match node.node_settings.profiles.get(profile_name) {
+                Some(x) => x,
+                None => return Err(RunDeployError::ProfileNotFound(profile_name.to_owned())),
+            };
+
+            vec![((node_name, node), (profile_name, profile))]
+        }
+        (Some(node_name), None) => {
+            let node = match data.nodes.get(node_name) {
+                Some(x) => x,
+                None => return Err(RunDeployError::NodeNotFound(node_name.to_owned())),
+            };
+
+            let mut profiles_list: Vec<(&str, &deploy::data::Profile)> = Vec::new();
+
+            for profile_name in [
+                node.node_settings.profiles_order.iter().collect(),
+                node.node_settings.profiles.keys().collect::<Vec<&String>>(),
+            ]
+            .concat()
+            {
+                let profile = match node.node_settings.profiles.get(profile_name) {
+                    Some(x) => x,
+                    None => return Err(RunDeployError::ProfileNotFound(profile_name.to_owned())),
+                };
+
+                if !profiles_list.iter().any(|(n, _)| n == profile_name) {
+                    profiles_list.push((&profile_name, profile));
+                }
+            }
+
+            profiles_list
+                .into_iter()
+                .map(|x| ((node_name.as_str(), node), x))
+                .collect()
+        }
+        (None, None) => {
+            let mut l = Vec::new();
+
+            for (node_name, node) in &data.nodes {
+                let mut profiles_list: Vec<(&str, &deploy::data::Profile)> = Vec::new();
+
+                for profile_name in [
+                    node.node_settings.profiles_order.iter().collect(),
+                    node.node_settings.profiles.keys().collect::<Vec<&String>>(),
+                ]
+                .concat()
+                {
+                    let profile = match node.node_settings.profiles.get(profile_name) {
+                        Some(x) => x,
+                        None => {
+                            return Err(RunDeployError::ProfileNotFound(profile_name.to_owned()))
+                        }
+                    };
+
+                    if !profiles_list.iter().any(|(n, _)| n == profile_name) {
+                        profiles_list.push((&profile_name, profile));
+                    }
+                }
+
+                let ll: ToDeploy = profiles_list
+                    .into_iter()
+                    .map(|x| ((node_name.as_str(), node), x))
+                    .collect();
+
+                l.extend(ll);
+            }
+
+            l
+        }
+        (None, Some(_)) => return Err(RunDeployError::ProfileWithoutNode),
+    };
+
+    let mut parts: Vec<(deploy::DeployData, deploy::DeployDefs)> = Vec::new();
+
+    for ((node_name, node), (profile_name, profile)) in to_deploy {
+        let deploy_data = deploy::make_deploy_data(
+            &data.generic_settings,
+            node,
+            node_name,
+            profile,
+            profile_name,
+            &cmd_overrides,
+            debug_logs,
+            log_dir.as_deref(),
+        );
+
+        let deploy_defs = deploy_data.defs()?;
+
+        parts.push((deploy_data, deploy_defs));
+    }
+
+    if interactive {
+        prompt_deployment(&parts[..])?;
+    } else {
+        print_deployment(&parts[..])?;
+    }
+
+    for (deploy_data, deploy_defs) in &parts {
+        deploy::push::push_profile(deploy::push::PushProfileData {
+            supports_flakes,
+            check_sigs,
+            repo: deploy_flake.repo,
+            deploy_data: &deploy_data,
+            deploy_defs: &deploy_defs,
+            keep_result,
+            result_path,
+            extra_build_args,
+        })
+        .await?;
+    }
+
+    for (deploy_data, deploy_defs) in &parts {
+        deploy::deploy::deploy_profile(&deploy_data, &deploy_defs).await?;
+    }
+
+    Ok(())
+}
+
+#[derive(Error, Debug)]
+enum RunError {
+    #[error("Failed to deploy profile: {0}")]
+    DeployProfile(#[from] deploy::deploy::DeployProfileError),
+    #[error("Failed to push profile: {0}")]
+    PushProfile(#[from] deploy::push::PushProfileError),
+    #[error("Failed to test for flake support: {0}")]
+    FlakeTest(std::io::Error),
+    #[error("Failed to check deployment: {0}")]
+    CheckDeployment(#[from] CheckDeploymentError),
+    #[error("Failed to evaluate deployment data: {0}")]
+    GetDeploymentData(#[from] GetDeploymentDataError),
+    #[error("Error parsing flake: {0}")]
+    ParseFlake(#[from] deploy::ParseFlakeError),
+    #[error("Error initiating logger: {0}")]
+    Logger(#[from] flexi_logger::FlexiLoggerError),
+    #[error("{0}")]
+    RunDeploy(#[from] RunDeployError),
+}
+
+async fn run() -> Result<(), RunError> {
+    let opts: Opts = Opts::parse();
+
+    deploy::init_logger(
+        opts.debug_logs,
+        opts.log_dir.as_deref(),
+        deploy::LoggerType::Deploy,
+    )?;
+
+    let deploy_flake = deploy::parse_flake(opts.flake.as_str())?;
+
+    let cmd_overrides = deploy::CmdOverrides {
+        ssh_user: opts.ssh_user,
+        profile_user: opts.profile_user,
+        ssh_opts: opts.ssh_opts,
+        fast_connection: opts.fast_connection,
+        auto_rollback: opts.auto_rollback,
+        hostname: opts.hostname,
+        magic_rollback: opts.magic_rollback,
+        temp_path: opts.temp_path,
+        confirm_timeout: opts.confirm_timeout,
+    };
+
+    let supports_flakes = test_flake_support().await.map_err(RunError::FlakeTest)?;
+
+    if !supports_flakes {
+        warn!("A Nix version without flakes support was detected, support for this is work in progress");
+    }
+
+    if !opts.skip_checks {
+        check_deployment(supports_flakes, deploy_flake.repo, &opts.extra_build_args).await?;
+    }
+
+    let data =
+        get_deployment_data(supports_flakes, deploy_flake.repo, &opts.extra_build_args).await?;
+
+    let result_path = opts.result_path.as_deref();
+
+    run_deploy(
+        deploy_flake,
+        data,
+        supports_flakes,
+        opts.checksigs,
+        opts.interactive,
+        cmd_overrides,
+        opts.keep_result,
+        result_path,
+        &opts.extra_build_args,
+        opts.debug_logs,
+        opts.log_dir,
+    )
+    .await?;
+
+    Ok(())
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    match run().await {
+        Ok(()) => (),
+        Err(err) => {
+            error!("{}", err);
+            std::process::exit(1);
+        }
+    }
+
+    Ok(())
+}