git.delta.rocks / jrsonnet / refs/commits / 3972fee37ee3

1use std::{ffi::OsStr, pin, process::Stdio, sync::Arc, task::Poll};23use anyhow::{anyhow, Result};4use better_command::{Handler, NixHandler, PlainHandler};5use futures::StreamExt;6use itertools::Either;7use openssh::{OverSsh, OwningCommand, Session};8use tokio::{io::AsyncRead, process::Command, select};9use tokio_util::codec::{BytesCodec, FramedRead, LinesCodec};10use tracing::debug;1112use crate::host::EscalationStrategy;1314fn escape_bash(input: &str, out: &mut String) {15	const TO_ESCAPE: &str = "$ !\"#&'()*,;<>?[\\]^`{|}";16	if input.chars().all(|c| !TO_ESCAPE.contains(c)) {17		out.push_str(input);18		return;19	}20	out.push('\'');21	for (i, v) in input.split('\'').enumerate() {22		if i != 0 {23			out.push_str("'\"'\"'");24		}25		out.push_str(v);26	}27	out.push('\'');28}29fn ostoutf8(os: impl AsRef<OsStr>) -> String {30	os.as_ref().to_str().expect("non-utf8 data").to_owned()31}3233#[derive(Clone, Debug)]34pub struct MyCommand {35	command: String,36	args: Vec<String>,37	env: Vec<(String, String)>,38	ssh_session: Option<Arc<Session>>,39	escalation: EscalationStrategy,40	escalate: bool,41}42impl MyCommand {43	pub fn new_on(44		escalation: EscalationStrategy,45		cmd: impl AsRef<OsStr>,46		session: Arc<Session>,47	) -> Self {48		assert!(!cmd.as_ref().is_empty());49		Self {50			command: ostoutf8(cmd),51			args: vec![],52			env: vec![],53			ssh_session: Some(session),54			escalation,55			escalate: false,56		}57	}58	pub fn new(escalation: EscalationStrategy, cmd: impl AsRef<OsStr>) -> Self {59		assert!(!cmd.as_ref().is_empty());60		Self {61			command: ostoutf8(cmd),62			args: vec![],63			env: vec![],64			ssh_session: None,65			escalation,66			escalate: false,67		}68	}69	fn new_here(&self, cmd: impl AsRef<OsStr>) -> Self {70		if let Some(ssh_session) = self.ssh_session.clone() {71			Self::new_on(self.escalation, cmd, ssh_session)72		} else {73			Self::new(self.escalation, cmd)74		}75	}7677	fn into_args(self) -> Vec<String> {78		let mut out = Vec::new();79		if !self.env.is_empty() {80			out.push("env".to_owned());81			for (k, v) in self.env {82				assert!(!k.contains('='));83				out.push(format!("{k}={v}"));84			}85		}86		out.push(self.command);87		out.extend(self.args);88		out89	}9091	/// Translates environment variables into env command execution.92	/// Required for ssh, as ssh don't allow to send environment variables (at least by default).93	///94	/// FIXME: Insecure, as arguments might be seen by other users on the same machine.95	/// Figure out some way to transfer environment using stdio?96	fn translate_env_into_env(self) -> Self {97		if self.env.is_empty() {98			return self;99		}100		let mut out = self.new_here("env");101		for (k, v) in self.env {102			assert!(!k.contains('='));103			out.arg(format!("{k}={v}"));104		}105		out.arg(self.command);106		out.args(self.args);107108		out109	}110	fn into_string(self) -> String {111		let mut out = String::new();112		if !self.env.is_empty() {113			out.push_str("env");114			for (k, v) in self.env {115				out.push(' ');116				assert!(!k.contains('='));117				escape_bash(&k, &mut out);118				out.push('=');119				escape_bash(&v, &mut out);120			}121		}122		if !out.is_empty() {123			out.push(' ');124		}125		escape_bash(&self.command, &mut out);126		for arg in self.args {127			out.push(' ');128			escape_bash(&arg, &mut out);129		}130		out131	}132	fn into_command_unchecked_local(self) -> Command {133		let mut out = Command::new(self.command);134		out.args(self.args);135		for (k, v) in self.env {136			out.env(k, v);137		}138		out139	}140	fn into_command(self) -> Result<Either<Command, openssh::OwningCommand<Arc<Session>>>> {141		Ok(if let Some(session) = self.ssh_session.clone() {142			let cmd = self.translate_env_into_env().into_command_unchecked_local();143			Either::Right(144				cmd.over_ssh(session)145					.map_err(|e| anyhow!("ssh error: {e}"))?,146			)147		} else {148			let cmd = self.into_command_unchecked_local();149			Either::Left(cmd)150		})151	}152	pub fn arg(&mut self, arg: impl AsRef<OsStr>) -> &mut Self {153		let arg = arg.as_ref();154		self.args.push(ostoutf8(arg));155		self156	}157	pub fn eqarg(&mut self, arg: impl AsRef<OsStr>, value: impl AsRef<OsStr>) -> &mut Self {158		let arg = arg.as_ref();159		let value = value.as_ref();160		let arg = ostoutf8(arg);161		let value = ostoutf8(value);162		self.arg(format!("{arg}={value}"));163		self164	}165	pub fn comparg(&mut self, arg: impl AsRef<OsStr>, value: impl AsRef<OsStr>) -> &mut Self {166		self.arg(arg);167		self.arg(value);168		self169	}170	pub fn env(&mut self, name: impl AsRef<str>, value: impl AsRef<str>) -> &mut Self {171		self.env172			.push((name.as_ref().to_owned(), value.as_ref().to_owned()));173		self174	}175	pub fn args<V: AsRef<OsStr>>(&mut self, args: impl IntoIterator<Item = V>) -> &mut Self {176		for arg in args.into_iter() {177			let arg = arg.as_ref();178			self.args.push(ostoutf8(arg));179		}180		self181	}182	pub fn sudo(mut self) -> Self {183		self.escalate = true;184		self185	}186	fn wrap_sudo_if_needed(self) -> Self {187		if !self.escalate {188			return self;189		}190		match self.escalation {191			EscalationStrategy::Su => {192				let mut out = self.new_here("su");193				out.arg("-c").arg(self.into_string());194				out195			}196			EscalationStrategy::Sudo => {197				let mut out = self.new_here("sudo");198				out.args(self.into_args());199				out200			}201			EscalationStrategy::Run0 => {202				// run0 wants interactive authentication by default.203				let mut run0 = self.new_here("run0");204				let mut out = self.new_here("script");205206				// Red backgrounds messes with fleet formatting207				run0.arg("--background=");208				run0.args(self.into_args());209210				out.arg("-q");211				out.arg("/dev/null");212				out.arg("-c");213				out.arg(run0.into_string());214				dbg!(&out);215				out216			}217		}218	}219220	pub async fn run(self) -> Result<()> {221		let str = self.clone().into_string();222		let cmd = self.wrap_sudo_if_needed().into_command()?;223		match cmd {224			Either::Left(cmd) => run_nix_inner(str, cmd, &mut PlainHandler).await?,225			Either::Right(cmd) => run_nix_inner_ssh(str, cmd, &mut PlainHandler).await?,226		};227		Ok(())228	}229	pub async fn run_string(self) -> Result<String> {230		let bytes = self.run_bytes().await?;231		Ok(String::from_utf8(bytes)?)232	}233	pub async fn run_bytes(self) -> Result<Vec<u8>> {234		let str = self.clone().into_string();235		let cmd = self.wrap_sudo_if_needed().into_command()?;236		let v = match cmd {237			Either::Left(cmd) => run_nix_inner_stdout(str, cmd, &mut PlainHandler).await?,238			Either::Right(cmd) => run_nix_inner_stdout_ssh(str, cmd, &mut PlainHandler).await?,239		};240		Ok(v)241	}242243	pub async fn run_nix_string(mut self) -> Result<String> {244		let str = self.clone().into_string();245		self.arg("--log-format").arg("internal-json");246		let cmd = self.wrap_sudo_if_needed().into_command()?;247		let bytes = match cmd {248			Either::Left(cmd) => run_nix_inner_stdout(str, cmd, &mut NixHandler::default()).await?,249			Either::Right(cmd) => {250				run_nix_inner_stdout_ssh(str, cmd, &mut NixHandler::default()).await?251			}252		};253		Ok(String::from_utf8(bytes)?)254	}255	pub async fn run_nix(mut self) -> Result<()> {256		let str = self.clone().into_string();257		self.arg("--log-format").arg("internal-json");258		let cmd = self.wrap_sudo_if_needed().into_command()?;259		match cmd {260			Either::Left(mut cmd) => {261				cmd.stdout(Stdio::inherit());262				run_nix_inner(str, cmd, &mut NixHandler::default()).await263			}264			Either::Right(mut cmd) => {265				cmd.stdout(openssh::Stdio::inherit());266				run_nix_inner_ssh(str, cmd, &mut NixHandler::default()).await267			}268		}269	}270}271272struct EmptyAsyncRead;273impl AsyncRead for EmptyAsyncRead {274	fn poll_read(275		self: std::pin::Pin<&mut Self>,276		_cx: &mut std::task::Context<'_>,277		_buf: &mut tokio::io::ReadBuf<'_>,278	) -> Poll<std::io::Result<()>> {279		Poll::Pending280	}281}282283async fn run_nix_inner_stdout(284	str: String,285	cmd: Command,286	handler: &mut dyn Handler,287) -> Result<Vec<u8>> {288	Ok(run_nix_inner_raw(str, cmd, true, handler, None)289		.await?290		.expect("has out"))291}292async fn run_nix_inner(str: String, cmd: Command, handler: &mut dyn Handler) -> Result<()> {293	let v = run_nix_inner_raw(str, cmd, false, handler, None).await?;294	assert!(v.is_none());295	Ok(())296}297async fn run_nix_inner_stdout_ssh(298	str: String,299	cmd: OwningCommand<Arc<Session>>,300	handler: &mut dyn Handler,301) -> Result<Vec<u8>> {302	Ok(run_nix_inner_raw_ssh(str, cmd, true, handler, None)303		.await?304		.expect("has out"))305}306async fn run_nix_inner_ssh(307	str: String,308	cmd: OwningCommand<Arc<Session>>,309	handler: &mut dyn Handler,310) -> Result<()> {311	let v = run_nix_inner_raw_ssh(str, cmd, false, handler, None).await?;312	assert!(v.is_none());313	Ok(())314}315316async fn run_nix_inner_raw(317	str: String,318	mut cmd: Command,319	want_stdout: bool,320	err_handler: &mut dyn Handler,321	mut out_handler: Option<&mut dyn Handler>,322) -> Result<Option<Vec<u8>>> {323	cmd.stderr(Stdio::piped());324	cmd.stdout(Stdio::piped());325	debug!("running command {str:?} on local");326	let mut child = cmd.spawn()?;327	let mut stderr = child.stderr.take().unwrap();328	let stdout = child.stdout.take().unwrap();329	let mut err = FramedRead::new(&mut stderr, LinesCodec::new());330	let mut out: Option<Box<dyn AsyncRead + Unpin>> = Some(Box::new(stdout));331	let mut ob = want_stdout332		.then(|| out.take().unwrap())333		.unwrap_or_else(|| Box::new(EmptyAsyncRead));334	let mut ol = (!want_stdout)335		.then(|| out.take().unwrap())336		.unwrap_or_else(|| Box::new(EmptyAsyncRead));337	let mut ob = FramedRead::new(&mut ob, BytesCodec::new());338	let mut ol = FramedRead::new(&mut ol, LinesCodec::new());339340	// while let Some(line) = read.next().await? {}341342	let mut out_buf = if want_stdout { Some(vec![]) } else { None };343	loop {344		select! {345			e = err.next() => {346				if let Some(e) = e {347					let e = e?;348					err_handler.handle_line(&e);349				}350			},351			o = ob.next() => {352				if let Some(o) = o {353					out_buf.as_mut().expect("stdout == wants_stdout").extend_from_slice(&o?);354				}355			},356			o = ol.next() => {357				if let Some(o) = o {358					let o = o?;359					if let Some(out) = out_handler.as_mut() {360						out.handle_line(&o)361					} else {362						err_handler.handle_line(&o)363					}364					// out_handler.handle_info(&o);365				}366			},367			code = child.wait() => {368				let code = code?;369				if !code.success() {370					anyhow::bail!("command '{str}' failed with status {}", code);371				}372				break;373			}374		}375	}376377	Ok(out_buf)378}379async fn run_nix_inner_raw_ssh(380	str: String,381	mut cmd: OwningCommand<Arc<Session>>,382	want_stdout: bool,383	err_handler: &mut dyn Handler,384	mut out_handler: Option<&mut dyn Handler>,385) -> Result<Option<Vec<u8>>> {386	debug!("running command {str:?} over ssh");387	cmd.stderr(openssh::Stdio::piped());388	cmd.stdout(openssh::Stdio::piped());389	let mut child = cmd.spawn().await?;390	let mut stderr = child.stderr().take().unwrap();391	let stdout = child.stdout().take().unwrap();392	let mut err = FramedRead::new(&mut stderr, LinesCodec::new());393	let mut out: Option<Box<dyn AsyncRead + Unpin>> = Some(Box::new(stdout));394	let mut ob = want_stdout395		.then(|| out.take().unwrap())396		.unwrap_or_else(|| Box::new(EmptyAsyncRead));397	let mut ol = (!want_stdout)398		.then(|| out.take().unwrap())399		.unwrap_or_else(|| Box::new(EmptyAsyncRead));400	let mut ob = FramedRead::new(&mut ob, BytesCodec::new());401	let mut ol = FramedRead::new(&mut ol, LinesCodec::new());402403	// while let Some(line) = read.next().await? {}404405	let mut out_buf = if want_stdout { Some(vec![]) } else { None };406407	let mut wait_future = pin::pin!(child.wait());408	loop {409		select! {410			e = err.next() => {411				if let Some(e) = e {412					let e = e?;413					err_handler.handle_line(&e);414				}415			},416			o = ob.next() => {417				if let Some(o) = o {418					out_buf.as_mut().expect("stdout == wants_stdout").extend_from_slice(&o?);419				}420			},421			o = ol.next() => {422				if let Some(o) = o {423					let o = o?;424					if let Some(out) = out_handler.as_mut() {425						out.handle_line(&o)426					} else {427						err_handler.handle_line(&o)428					}429					// out_handler.handle_info(&o);430				}431			},432			code = &mut wait_future => {433				let code = code?;434				if !code.success() {435					anyhow::bail!("command '{str}' failed with status {}", code);436				}437				break;438			}439		}440	}441442	Ok(out_buf)443}