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"log", + "semver", + "serde", + "serde_derive", + "serde_json", + "unicode-xid", + "wasmparser", +] + +[[package]] +name = "zmij" +version = "1.0.21" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "b8848ee67ecc8aedbaf3e4122217aff892639231befc6a1b58d29fff4c2cabaa" diff --git a/Cargo.toml b/Cargo.toml index 386ee49..b4b3e7e 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -20,4 +20,12 @@ version = "0.6.0-next" edition = "2024" [dependencies] -clap = { version = "4", features = ["derive"] } +clap = { version = "4", features = ["derive", "env"] } +dirs = "5" +env_logger = "0.11" +log = "0.4" +serde = { version = "1", features = ["derive"] } +toml = "0.8" + +[dev-dependencies] +tempfile = "3" diff --git a/README.md b/README.md new file mode 100644 index 0000000..283f9bb --- /dev/null +++ b/README.md @@ -0,0 +1,57 @@ +# openshell-image-builder + +CLI tool to build OpenShell images. + +## Configuration + +### File location + +The tool looks for a configuration file in this order, using the first one found: + +1. Path given by the `--config` flag +2. Path set in the `OPENSHELL_IMAGE_BUILDER_CONFIG` environment variable +3. The platform config directory: + - Linux: `$XDG_CONFIG_HOME/openshell-image-builder/config.toml` (defaults to `~/.config/openshell-image-builder/config.toml`) + - macOS: `~/Library/Application Support/openshell-image-builder/config.toml` + - Windows: `%APPDATA%\openshell-image-builder\config.toml` + +If no file is found, or the file is empty, built-in defaults are used. + +If a path is given explicitly (via `--config` or the environment variable) but the file does not exist, the command fails immediately. + +### Schema + +```toml +[openshell_image_builder] +version = 1 + +[openshell_image_builder.base_image] +image = "fedora" # or "ubuntu" +tag = "latest" # or "43", "24.04", etc. +``` + +| Field | Default | Description | +| ------------------------------------------ | -------- | ---------------------------- | +| `openshell_image_builder.version` | `1` | Configuration schema version | +| `openshell_image_builder.base_image.image` | `fedora` | Base image name | +| `openshell_image_builder.base_image.tag` | `latest` | Base image tag | + +### Examples + +Use a specific config file: + +```sh +openshell-image-builder --config /path/to/config.toml +``` + +Use an environment variable: + +```sh +OPENSHELL_IMAGE_BUILDER_CONFIG=/path/to/config.toml openshell-image-builder +``` + +Enable verbose logging to trace which config file is loaded: + +```sh +openshell-image-builder -v +``` diff --git a/src/config.rs b/src/config.rs new file mode 100644 index 0000000..463b91b --- /dev/null +++ b/src/config.rs @@ -0,0 +1,177 @@ +// Copyright (C) 2026 Red Hat, Inc. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. +// +// SPDX-License-Identifier: Apache-2.0 + +use std::path::PathBuf; + +use log::info; +use serde::Deserialize; + +#[derive(Deserialize)] +struct ConfigFile { + openshell_image_builder: Config, +} + +#[derive(Deserialize, Debug, PartialEq)] +pub struct Config { + #[serde(default = "default_version")] + pub version: u32, + #[serde(default)] + pub base_image: BaseImageConfig, +} + +#[derive(Deserialize, Debug, PartialEq)] +pub struct BaseImageConfig { + #[serde(default = "default_image")] + pub image: String, + #[serde(default = "default_tag")] + pub tag: String, +} + +fn default_version() -> u32 { + 1 +} + +fn default_image() -> String { + "fedora".to_string() +} + +fn default_tag() -> String { + "latest".to_string() +} + +impl Default for Config { + fn default() -> Self { + Config { + version: default_version(), + base_image: BaseImageConfig::default(), + } + } +} + +impl Default for BaseImageConfig { + fn default() -> Self { + BaseImageConfig { + image: default_image(), + tag: default_tag(), + } + } +} + +fn find_config_file(explicit_path: Option) -> Result, std::io::Error> { + if let Some(path) = explicit_path { + if path.exists() { + info!("Config file found at {}", path.display()); + return Ok(Some(path)); + } + return Err(std::io::Error::new( + std::io::ErrorKind::NotFound, + format!("Config file not found: {}", path.display()), + )); + } + let xdg_path = + dirs::config_dir().map(|d| d.join("openshell-image-builder").join("config.toml")); + match xdg_path { + Some(ref path) if path.exists() => { + info!("Config file found at XDG path {}", path.display()); + Ok(xdg_path) + } + Some(ref path) => { + info!("No config file at XDG path {}", path.display()); + Ok(None) + } + None => { + info!("XDG config directory not available"); + Ok(None) + } + } +} + +pub fn load(explicit_path: Option) -> Result> { + let Some(path) = find_config_file(explicit_path)? else { + info!("No config file found, using built-in defaults"); + return Ok(Config::default()); + }; + + let content = std::fs::read_to_string(&path).unwrap_or_default(); + if content.trim().is_empty() { + info!( + "Config file {} is empty, using built-in defaults", + path.display() + ); + return Ok(Config::default()); + } + + let file: ConfigFile = toml::from_str(&content)?; + info!("Config loaded from {}", path.display()); + Ok(file.openshell_image_builder) +} + +#[cfg(test)] +mod tests { + use super::*; + use std::io::Write; + + #[test] + fn default_config() { + let config = Config::default(); + assert_eq!(config.version, 1); + assert_eq!(config.base_image.image, "fedora"); + assert_eq!(config.base_image.tag, "latest"); + } + + #[test] + fn load_fails_when_explicit_path_not_found() { + let path = std::env::temp_dir().join("openshell-image-builder-nonexistent.toml"); + assert!(!path.exists()); + assert!(load(Some(path)).is_err()); + } + + #[test] + fn load_returns_defaults_for_empty_file() { + let mut f = tempfile::NamedTempFile::new().unwrap(); + writeln!(f, " ").unwrap(); + let config = load(Some(f.path().to_path_buf())).unwrap(); + assert_eq!(config, Config::default()); + } + + #[test] + fn load_parses_valid_toml() { + let mut f = tempfile::NamedTempFile::new().unwrap(); + writeln!( + f, + r#" +[openshell_image_builder] +version = 2 + +[openshell_image_builder.base_image] +image = "ubuntu" +tag = "24.04" +"# + ) + .unwrap(); + let config = load(Some(f.path().to_path_buf())).unwrap(); + assert_eq!(config.version, 2); + assert_eq!(config.base_image.image, "ubuntu"); + assert_eq!(config.base_image.tag, "24.04"); + } + + #[test] + fn load_returns_error_for_invalid_toml() { + let mut f = tempfile::NamedTempFile::new().unwrap(); + writeln!(f, "not valid toml [[[").unwrap(); + assert!(load(Some(f.path().to_path_buf())).is_err()); + } +} diff --git a/src/main.rs b/src/main.rs index 8c5eca2..cdbe632 100644 --- a/src/main.rs +++ b/src/main.rs @@ -14,7 +14,12 @@ // // SPDX-License-Identifier: Apache-2.0 +mod config; + +use std::path::PathBuf; + use clap::Parser; +use log::LevelFilter; #[derive(Parser)] #[command( @@ -22,10 +27,35 @@ use clap::Parser; version, about = "OpenShell image builder" )] -struct Cli {} +struct Cli { + #[arg( + long, + env = "OPENSHELL_IMAGE_BUILDER_CONFIG", + help = "Path to config file" + )] + config: Option, + #[arg( + short = 'v', + action = clap::ArgAction::Count, + help = "Increase log verbosity (-v info, -vv debug)" + )] + verbose: u8, +} fn main() { - let _cli = Cli::parse(); + let cli = Cli::parse(); + // TODO: when JSON output is added, logs written to stderr may interfere with + // structured output — revisit whether logs should be suppressed or embedded in the JSON. + let log_level = match cli.verbose { + 0 => LevelFilter::Warn, + 1 => LevelFilter::Info, + _ => LevelFilter::Debug, + }; + env_logger::Builder::new().filter_level(log_level).init(); + let _config = config::load(cli.config).unwrap_or_else(|e| { + eprintln!("Error reading config file: {e}"); + std::process::exit(1); + }); } #[cfg(test)]