1 files changed, 561 insertions, 0 deletions
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(())
+}