diff --git a/CHANGELOG.md b/CHANGELOG.md index 3d54889..fb37162 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -1,5 +1,16 @@ # Changelog +## [Unreleased] + +### Added + +- Check for existing unit files with the same name as the service generated by quadlet from the podlet generated quadlet file and throw an error if there is a conflict (#14). + - Use `--skip-services-check` to opt out. + +### Changed + +- Breaking: files are no longer overwritten by default, added `--overwrite` flag if overwriting is desired. + ## [0.1.1] - 2023-04-19 ### Added diff --git a/Cargo.lock b/Cargo.lock index 8b9ce80..ad4510b 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -17,6 +17,15 @@ version = "1.0.2" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe" +[[package]] +name = "aho-corasick" +version = "1.0.1" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = 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+version = "0.1.68" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "b9ccdd8f2a161be9bd5c023df56f1b2a0bd1d83872ae53b71a84a12c9bf6e842" +dependencies = [ + "proc-macro2", + "quote", + "syn 2.0.15", +] + +[[package]] +name = "atomic-waker" +version = "1.1.1" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "1181e1e0d1fce796a03db1ae795d67167da795f9cf4a39c37589e85ef57f26d3" + +[[package]] +name = "autocfg" +version = "1.1.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa" + [[package]] name = "backtrace" version = "0.3.67" @@ -87,6 +212,36 @@ version = "1.3.2" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a" +[[package]] +name = "block-buffer" +version = "0.10.4" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = 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+ [[package]] name = "errno" version = "0.3.1" @@ -182,7 +416,7 @@ checksum = "4bcfec3a70f97c962c307b2d2c56e358cf1d00b558d74262b5f929ee8cc7e73a" dependencies = [ "errno-dragonfly", "libc", - "windows-sys", + "windows-sys 0.48.0", ] [[package]] @@ -195,6 +429,12 @@ dependencies = [ "libc", ] +[[package]] +name = "event-listener" +version = "2.5.3" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "0206175f82b8d6bf6652ff7d71a1e27fd2e4efde587fd368662814d6ec1d9ce0" + [[package]] name = "eyre" version = "0.6.8" @@ -205,6 +445,15 @@ dependencies = [ "once_cell", ] +[[package]] +name = "fastrand" +version = "1.9.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "e51093e27b0797c359783294ca4f0a911c270184cb10f85783b118614a1501be" +dependencies = [ + "instant", +] + [[package]] name = "form_urlencoded" version = "1.1.0" @@ -214,12 +463,94 @@ dependencies = [ "percent-encoding", ] +[[package]] +name = "futures-core" +version = "0.3.28" 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[[package]] name = "gimli" version = "0.27.2" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "ad0a93d233ebf96623465aad4046a8d3aa4da22d4f4beba5388838c8a434bbb4" +[[package]] +name = "hashbrown" +version = "0.12.3" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888" + [[package]] name = "heck" version = "0.4.1" @@ -232,6 +563,12 @@ version = "0.3.1" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "fed44880c466736ef9a5c5b5facefb5ed0785676d0c02d612db14e54f0d84286" +[[package]] +name = "hex" +version = "0.4.3" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70" + [[package]] name = "idna" version = "0.3.0" @@ -248,6 +585,25 @@ version = "0.3.3" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = 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ipnet = "2.7" -nix = { version = "0.26", features = ["user"], default-features = false } shlex = "1.1" thiserror = "1.0.40" url = "2.3" +[target.'cfg(unix)'.dependencies] +nix = { version = "0.26", features = ["user"], default-features = false } +zbus = "3.12" + # The profile that 'cargo dist' will build with [profile.dist] inherits = "release" diff --git a/src/cli.rs b/src/cli.rs index 5802881..bc0a641 100644 --- a/src/cli.rs +++ b/src/cli.rs @@ -6,22 +6,24 @@ mod service; mod unit; mod volume; +#[cfg(unix)] +mod systemd_dbus; + use std::{ borrow::Cow, env, + ffi::OsStr, fmt::Display, fs::File, - io::Write, + io::{self, Write}, path::{Path, PathBuf}, }; use clap::{Parser, Subcommand}; use color_eyre::{ eyre::{self, Context}, - Help, + Help, Report, }; -#[cfg(unix)] -use nix::unistd::Uid; use self::{ container::Container, install::Install, kube::Kube, network::Network, service::Service, @@ -72,6 +74,21 @@ pub struct Cli { #[arg(short, long, requires = "file_out")] name: Option, + /// Overwrite existing files when generating a file + /// + /// By default, podlet will return an error if a file already exists at the given location. + #[arg(long, alias = "override", requires = "file_out")] + overwrite: bool, + + /// Skip the check for existing services of the same name + /// + /// By default, podlet will check for existing services with the same name as + /// the service quadlet will generate from the generated quadlet file + /// and return an error if a conflict is found. + /// This option will cause podlet to skip that check. + #[arg(long, requires = "file_out")] + skip_services_check: bool, + /// The \[Unit\] section #[command(flatten)] unit: Unit, @@ -105,13 +122,27 @@ impl Cli { pub fn print_or_write_file(&self) -> eyre::Result<()> { if self.unit_directory || self.file.is_some() { let path = self.file_path()?; - let mut file = File::create(&path) - .wrap_err_with(|| format!("Failed to create/open file: {}", path.display())) - .suggestion( - "Make sure the directory exists and you have write permissions for the file", - )?; - write!(file, "{self}").wrap_err("Failed to write to file")?; - println!("Wrote to file: {}", path.display()); + let path_display = path.display(); + let mut file = File::options() + .write(true) + .create_new(!self.overwrite) + .create(self.overwrite) + .open(&path) + .map_err(|error| match error.kind() { + io::ErrorKind::AlreadyExists => { + eyre::eyre!("File already exists, not overwriting it: {path_display}") + .suggestion("Use `--overwrite` if you wish overwrite existing files.") + } + _ => Report::new(error) + .wrap_err(format!("Failed to create/open file: {path_display}")) + .suggestion( + "Make sure the directory exists \ + and you have write permissions for the file", + ), + })?; + write!(file, "{self}") + .wrap_err_with(|| format!("Failed to write to file: {path_display}"))?; + println!("Wrote to file: {path_display}"); Ok(()) } else { print!("{self}"); @@ -122,11 +153,34 @@ impl Cli { /// Returns the file path for the generated file fn file_path(&self) -> eyre::Result> { let mut path = if self.unit_directory { - unit_dir() + #[cfg(unix)] + if nix::unistd::Uid::current().is_root() { + let path = PathBuf::from("/etc/containers/systemd/"); + if path.is_dir() { + path + } else { + PathBuf::from("/usr/share/containers/systemd/") + } + } else { + let mut path: PathBuf = env::var("XDG_CONFIG_HOME") + .or_else(|_| env::var("HOME").map(|home| format!("{home}/.config"))) + .unwrap_or_else(|_| String::from("~/.config/")) + .into(); + path.push("containers/systemd/"); + path + } + + #[cfg(not(unix))] + return Err(eyre::eyre!( + "Cannot get podman unit directory on non-unix system" + )); } else if let Some(Some(path)) = &self.file { if path.is_dir() { path.clone() } else { + if let Some(name) = path.file_stem().and_then(OsStr::to_str) { + self.check_existing(name)?; + } return Ok(path.into()); } } else { @@ -135,36 +189,37 @@ impl Cli { }; let Commands::Podman { command } = &self.command; + let name = self.name.as_deref().unwrap_or_else(|| command.name()); + self.check_existing(name)?; - path.push(self.name.as_deref().unwrap_or_else(|| command.name())); + path.push(name); path.set_extension(command.extension()); Ok(path.into()) } -} -#[cfg(unix)] -fn unit_dir() -> PathBuf { - if Uid::current().is_root() { - let path = PathBuf::from("/etc/containers/systemd/"); - if path.is_dir() { - path - } else { - PathBuf::from("/usr/share/containers/systemd/") + fn check_existing(&self, name: &str) -> eyre::Result<()> { + #[cfg(unix)] + if !self.skip_services_check { + if let Ok(unit_files) = systemd_dbus::unit_files() { + let Commands::Podman { command } = &self.command; + let service = command.name_to_service(name); + for systemd_dbus::UnitFile { file_name, status } in unit_files { + if !(self.overwrite && status == "generated") && file_name.contains(&service) { + return Err(eyre::eyre!( + "File name `{name}` conflicts with existing unit file: {file_name}" + ) + .suggestion( + "Change the generated file's name with `--file` or `--name`. \ + Alternatively, use `--skip-services-check` if this is ok.", + )); + } + } + } } - } else { - let mut path: PathBuf = env::var("XDG_CONFIG_HOME") - .or_else(|_| env::var("HOME").map(|home| format!("{home}/.config"))) - .unwrap_or_else(|_| String::from("~/.config/")) - .into(); - path.push("containers/systemd/"); - path - } -} -#[cfg(not(unix))] -fn unit_dir() -> PathBuf { - panic!("Cannot get podman unit directory on non-unix system"); + Ok(()) + } } #[derive(Subcommand, Debug, Clone, PartialEq)] @@ -244,20 +299,32 @@ impl PodmanCommands { /// Returns the name that should be used for the generated file fn name(&self) -> &str { match self { - PodmanCommands::Run { container, .. } => container.name(), - PodmanCommands::Kube { kube } => kube.name(), - PodmanCommands::Network { network } => network.name(), - PodmanCommands::Volume { volume } => volume.name(), + Self::Run { container, .. } => container.name(), + Self::Kube { kube } => kube.name(), + Self::Network { network } => network.name(), + Self::Volume { volume } => volume.name(), } } + /// Takes a file name (no extension) and returns the corresponding service file name + /// generated by quadlet + fn name_to_service(&self, name: &str) -> String { + let mut service = match self { + Self::Run { .. } | Self::Kube { .. } => String::from(name), + Self::Network { .. } => format!("{name}-network"), + Self::Volume { .. } => format!("{name}-volume"), + }; + service.push_str(".service"); + service + } + /// Returns the extension that should be used for the generated file fn extension(&self) -> &'static str { match self { - PodmanCommands::Run { .. } => "container", - PodmanCommands::Kube { .. } => "kube", - PodmanCommands::Network { .. } => "network", - PodmanCommands::Volume { .. } => "volume", + Self::Run { .. } => "container", + Self::Kube { .. } => "kube", + Self::Network { .. } => "network", + Self::Volume { .. } => "volume", } } } diff --git a/src/cli/systemd_dbus.rs b/src/cli/systemd_dbus.rs new file mode 100644 index 0000000..f7ee200 --- /dev/null +++ b/src/cli/systemd_dbus.rs @@ -0,0 +1,40 @@ +use nix::unistd::Uid; +use zbus::{blocking::Connection, dbus_proxy}; + +pub fn unit_files() -> zbus::Result> { + let connection = Connection::system()?; + let manager = ManagerProxyBlocking::new(&connection)?; + let mut unit_files = manager.list_unit_files()?; + + if !Uid::current().is_root() { + let connection = Connection::session()?; + let manager = ManagerProxyBlocking::new(&connection)?; + unit_files.extend(manager.list_unit_files()?); + } + + Ok(unit_files.into_iter().map(Into::into)) +} + +#[dbus_proxy( + interface = "org.freedesktop.systemd1.Manager", + default_service = "org.freedesktop.systemd1", + default_path = "/org/freedesktop/systemd1" +)] +trait Manager { + fn list_unit_files(&self) -> zbus::Result>; +} + +#[derive(Debug, Clone, PartialEq)] +pub struct UnitFile { + pub file_name: String, + pub status: String, +} + +impl From<(String, String)> for UnitFile { + fn from(value: (String, String)) -> Self { + Self { + file_name: value.0, + status: value.1, + } + } +} diff --git a/src/main.rs b/src/main.rs index 1f16b6b..17f056a 100644 --- a/src/main.rs +++ b/src/main.rs @@ -13,6 +13,8 @@ //! Run `podlet --help` for more information. #![warn(clippy::pedantic, clippy::cargo)] +// zbus uses some old dependencies, this is ok for now +#![allow(clippy::multiple_crate_versions)] mod cli;