974 lines
27 KiB
Rust
974 lines
27 KiB
Rust
use std::{collections::{HashSet, VecDeque}, os::unix::fs::PermissionsExt};
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use crate::{
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builtin::{
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alias::{alias, unalias}, cd::cd, dirstack::{dirs, popd, pushd}, echo::echo, eval, exec, flowctl::flowctl, jobctl::{JobBehavior, continue_job, disown, jobs}, pwd::pwd, read::read_builtin, shift::shift, shopt::shopt, source::source, test::double_bracket_test, trap::{TrapTarget, trap}, true_builtin, varcmds::{export, local, readonly, unset}, zoltraak::zoltraak
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},
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expand::{expand_aliases, glob_to_regex},
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jobs::{ChildProc, JobStack, dispatch_job},
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libsh::error::{ShErr, ShErrKind, ShResult, ShResultExt},
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prelude::*,
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procio::{IoMode, IoStack},
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state::{self, ShFunc, VarFlags, read_logic, read_shopts, write_jobs, write_logic, write_vars},
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};
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use super::{
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AssignKind, CaseNode, CondNode, ConjunctNode, ConjunctOp, LoopKind, NdFlags, NdRule, Node,
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ParsedSrc, Redir, RedirType,
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lex::{KEYWORDS, Span, Tk, TkFlags},
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};
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thread_local! {
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static RECURSE_DEPTH: std::cell::Cell<usize> = const { std::cell::Cell::new(0) };
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}
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pub fn is_in_path(name: &str) -> bool {
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if name.starts_with("./") || name.starts_with("../") || name.starts_with('/') {
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let path = Path::new(name);
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if path.exists() && path.is_file() && !path.is_dir() {
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let meta = match path.metadata() {
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Ok(m) => m,
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Err(_) => return false,
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};
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if meta.permissions().mode() & 0o111 != 0 {
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return true;
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}
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}
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false
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} else {
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let Ok(path) = env::var("PATH") else { return false };
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let paths = path.split(':');
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for path in paths {
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let full_path = Path::new(path).join(name);
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if full_path.exists() && full_path.is_file() && !full_path.is_dir() {
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let meta = match full_path.metadata() {
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Ok(m) => m,
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Err(_) => continue,
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};
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if meta.permissions().mode() & 0o111 != 0 {
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return true;
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}
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}
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}
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false
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}
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}
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pub struct ScopeGuard;
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impl ScopeGuard {
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pub fn exclusive_scope(args: Option<Vec<(String, Span)>>) -> Self {
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let argv = args.map(|a| a.into_iter().map(|(s, _)| s).collect::<Vec<_>>());
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write_vars(|v| v.descend(argv));
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Self
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}
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pub fn shared_scope() -> Self {
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// used in environments that inherit from the parent, like subshells
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write_vars(|v| v.descend(None));
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Self
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}
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}
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impl Drop for ScopeGuard {
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fn drop(&mut self) {
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write_vars(|v| v.ascend());
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}
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}
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/// Used to throw away variables that exist in temporary contexts
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/// such as 'VAR=value <command> <args>'
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/// or for-loop variables
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struct VarCtxGuard {
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vars: HashSet<String>,
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}
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impl VarCtxGuard {
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fn new(vars: HashSet<String>) -> Self {
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Self { vars }
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}
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}
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impl Drop for VarCtxGuard {
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fn drop(&mut self) {
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write_vars(|v| {
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for var in &self.vars {
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v.unset_var(var).ok();
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}
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});
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}
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}
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pub enum AssignBehavior {
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Export,
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Set,
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}
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/// Arguments to the execvpe function
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pub struct ExecArgs {
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pub cmd: (CString, Span),
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pub argv: Vec<CString>,
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pub envp: Vec<CString>,
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}
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impl ExecArgs {
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pub fn new(argv: Vec<Tk>) -> ShResult<Self> {
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assert!(!argv.is_empty());
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let argv = prepare_argv(argv)?;
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Self::from_expanded(argv)
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}
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pub fn from_expanded(argv: Vec<(String, Span)>) -> ShResult<Self> {
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assert!(!argv.is_empty());
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let cmd = Self::get_cmd(&argv);
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let argv = Self::get_argv(argv);
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let envp = Self::get_envp();
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Ok(Self { cmd, argv, envp })
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}
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pub fn get_cmd(argv: &[(String, Span)]) -> (CString, Span) {
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let cmd = argv[0].0.as_str();
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let span = argv[0].1.clone();
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(CString::new(cmd).unwrap(), span)
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}
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pub fn get_argv(argv: Vec<(String, Span)>) -> Vec<CString> {
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argv
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.into_iter()
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.map(|s| CString::new(s.0).unwrap())
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.collect()
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}
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pub fn get_envp() -> Vec<CString> {
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std::env::vars()
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.map(|v| CString::new(format!("{}={}", v.0, v.1)).unwrap())
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.collect()
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}
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}
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pub fn exec_input(input: String, io_stack: Option<IoStack>, interactive: bool) -> ShResult<()> {
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let log_tab = read_logic(|l| l.clone());
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let input = expand_aliases(input, HashSet::new(), &log_tab);
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let lex_flags = if interactive {
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super::lex::LexFlags::INTERACTIVE
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} else {
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super::lex::LexFlags::empty()
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};
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let mut parser = ParsedSrc::new(Arc::new(input)).with_lex_flags(lex_flags);
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if let Err(errors) = parser.parse_src() {
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for error in errors {
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eprintln!("{error}");
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}
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return Ok(());
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}
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let nodes = parser.extract_nodes();
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let mut dispatcher = Dispatcher::new(nodes, interactive);
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if let Some(mut stack) = io_stack {
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dispatcher.io_stack.extend(stack.drain(..));
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}
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let result = dispatcher.begin_dispatch();
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if state::get_status() != 0
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&& let Some(trap) = read_logic(|l| l.get_trap(TrapTarget::Error))
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{
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let saved_status = state::get_status();
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exec_input(trap, None, false)?;
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state::set_status(saved_status);
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}
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result
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}
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pub struct Dispatcher {
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nodes: VecDeque<Node>,
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interactive: bool,
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pub io_stack: IoStack,
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pub job_stack: JobStack,
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}
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impl Dispatcher {
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pub fn new(nodes: Vec<Node>, interactive: bool) -> Self {
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let nodes = VecDeque::from(nodes);
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Self {
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nodes,
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interactive,
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io_stack: IoStack::new(),
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job_stack: JobStack::new(),
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}
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}
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pub fn begin_dispatch(&mut self) -> ShResult<()> {
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while let Some(node) = self.nodes.pop_front() {
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let blame = node.get_span();
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self.dispatch_node(node).try_blame(blame)?;
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}
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Ok(())
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}
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pub fn dispatch_node(&mut self, node: Node) -> ShResult<()> {
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match node.class {
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NdRule::Conjunction { .. } => self.exec_conjunction(node)?,
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NdRule::Pipeline { .. } => self.exec_pipeline(node)?,
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NdRule::IfNode { .. } => self.exec_if(node)?,
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NdRule::LoopNode { .. } => self.exec_loop(node)?,
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NdRule::ForNode { .. } => self.exec_for(node)?,
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NdRule::CaseNode { .. } => self.exec_case(node)?,
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NdRule::BraceGrp { .. } => self.exec_brc_grp(node)?,
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NdRule::FuncDef { .. } => self.exec_func_def(node)?,
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NdRule::Command { .. } => self.dispatch_cmd(node)?,
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NdRule::Test { .. } => self.exec_test(node)?,
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_ => unreachable!(),
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}
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Ok(())
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}
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pub fn dispatch_cmd(&mut self, node: Node) -> ShResult<()> {
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let Some(cmd) = node.get_command() else {
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return self.exec_cmd(node); // Argv is empty, probably an assignment
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};
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if is_func(node.get_command().cloned()) {
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self.exec_func(node)
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} else if cmd.flags.contains(TkFlags::BUILTIN) {
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self.exec_builtin(node)
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} else if is_subsh(node.get_command().cloned()) {
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self.exec_subsh(node)
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} else if read_shopts(|s| s.core.autocd)
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&& Path::new(cmd.span.as_str()).is_dir()
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&& !is_in_path(cmd.span.as_str()) {
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let dir = cmd.span.as_str().to_string();
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let stack = IoStack {
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stack: self.io_stack.clone(),
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};
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exec_input(format!("cd {dir}"), Some(stack), self.interactive)
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} else {
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self.exec_cmd(node)
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}
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}
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pub fn exec_conjunction(&mut self, conjunction: Node) -> ShResult<()> {
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let NdRule::Conjunction { elements } = conjunction.class else {
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unreachable!()
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};
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let mut elem_iter = elements.into_iter();
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while let Some(element) = elem_iter.next() {
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let ConjunctNode { cmd, operator } = element;
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self.dispatch_node(*cmd)?;
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let status = state::get_status();
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match operator {
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ConjunctOp::And => {
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if status != 0 {
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break;
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}
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}
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ConjunctOp::Or => {
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if status == 0 {
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break;
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}
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}
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ConjunctOp::Null => break,
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}
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}
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Ok(())
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}
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pub fn exec_test(&mut self, node: Node) -> ShResult<()> {
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let test_result = double_bracket_test(node)?;
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match test_result {
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true => state::set_status(0),
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false => state::set_status(1),
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}
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Ok(())
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}
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pub fn exec_func_def(&mut self, func_def: Node) -> ShResult<()> {
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let blame = func_def.get_span();
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let NdRule::FuncDef { name, body } = func_def.class else {
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unreachable!()
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};
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let body_span = body.get_span();
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let body = body_span.as_str().to_string();
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let name = name.span.as_str().strip_suffix("()").unwrap();
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if KEYWORDS.contains(&name) {
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return Err(ShErr::full(
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ShErrKind::SyntaxErr,
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format!("function: Forbidden function name `{name}`"),
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blame,
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));
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}
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let mut func_parser = ParsedSrc::new(Arc::new(body));
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if let Err(errors) = func_parser.parse_src() {
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for error in errors {
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eprintln!("{error}");
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}
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return Ok(());
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}
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let func = ShFunc::new(func_parser);
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write_logic(|l| l.insert_func(name, func)); // Store the AST
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Ok(())
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}
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fn exec_subsh(&mut self, subsh: Node) -> ShResult<()> {
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let NdRule::Command { assignments, argv } = subsh.class else {
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unreachable!()
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};
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self.run_fork("anonymous_subshell", |s| {
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if let Err(e) = s.set_assignments(assignments, AssignBehavior::Export) {
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eprintln!("{e}");
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return;
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};
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s.io_stack.append_to_frame(subsh.redirs);
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let mut argv = match prepare_argv(argv) {
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Ok(argv) => argv,
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Err(e) => {
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eprintln!("{e}");
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return;
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}
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};
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let subsh = argv.remove(0);
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let subsh_body = subsh.0.to_string();
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if let Err(e) = exec_input(subsh_body, None, s.interactive) {
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eprintln!("{e}");
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};
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})
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}
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fn exec_func(&mut self, func: Node) -> ShResult<()> {
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let blame = func.get_span().clone();
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let NdRule::Command {
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assignments,
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mut argv,
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} = func.class
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else {
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unreachable!()
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};
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let max_depth = read_shopts(|s| s.core.max_recurse_depth);
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let depth = RECURSE_DEPTH.with(|d| {
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let cur = d.get();
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d.set(cur + 1);
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cur + 1
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});
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if depth > max_depth {
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RECURSE_DEPTH.with(|d| d.set(d.get() - 1));
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return Err(ShErr::full(
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ShErrKind::InternalErr,
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format!("maximum recursion depth ({max_depth}) exceeded"),
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blame,
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));
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}
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let env_vars = self.set_assignments(assignments, AssignBehavior::Export)?;
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let _var_guard = VarCtxGuard::new(env_vars.into_iter().collect());
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self.io_stack.append_to_frame(func.redirs);
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let func_name = argv.remove(0).span.as_str().to_string();
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let argv = prepare_argv(argv)?;
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let result = if let Some(ref mut func_body) = read_logic(|l| l.get_func(&func_name)) {
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let _guard = ScopeGuard::exclusive_scope(Some(argv));
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func_body.body_mut().flags = func.flags;
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if let Err(e) = self.exec_brc_grp(func_body.body().clone()) {
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match e.kind() {
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ShErrKind::FuncReturn(code) => {
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state::set_status(*code);
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Ok(())
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}
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_ => Err(e).blame(blame),
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}
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} else {
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Ok(())
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}
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} else {
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Err(ShErr::full(
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ShErrKind::InternalErr,
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format!("Failed to find function '{}'", func_name),
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blame,
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))
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};
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RECURSE_DEPTH.with(|d| d.set(d.get() - 1));
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result
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}
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fn exec_brc_grp(&mut self, brc_grp: Node) -> ShResult<()> {
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let NdRule::BraceGrp { body } = brc_grp.class else {
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unreachable!()
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};
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let fork_builtins = brc_grp.flags.contains(NdFlags::FORK_BUILTINS);
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self.io_stack.append_to_frame(brc_grp.redirs);
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let _guard = self.io_stack.pop_frame().redirect()?;
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let brc_grp_logic = |s: &mut Self| -> ShResult<()> {
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for node in body {
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let blame = node.get_span();
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s.dispatch_node(node).try_blame(blame)?;
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}
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Ok(())
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};
|
|
|
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if fork_builtins {
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log::trace!("Forking brace group");
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self.run_fork("brace group", |s| {
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if let Err(e) = brc_grp_logic(s) {
|
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eprintln!("{e}");
|
|
}
|
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})
|
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} else {
|
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brc_grp_logic(self)
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}
|
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}
|
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fn exec_case(&mut self, case_stmt: Node) -> ShResult<()> {
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let blame = case_stmt.get_span().clone();
|
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let NdRule::CaseNode {
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pattern,
|
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case_blocks,
|
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} = case_stmt.class
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else {
|
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unreachable!()
|
|
};
|
|
|
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let fork_builtins = case_stmt.flags.contains(NdFlags::FORK_BUILTINS);
|
|
|
|
self.io_stack.append_to_frame(case_stmt.redirs);
|
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let _guard = self.io_stack.pop_frame().redirect()?;
|
|
|
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let case_logic = |s: &mut Self| -> ShResult<()> {
|
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let exp_pattern = pattern.clone().expand()?;
|
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let pattern_raw = exp_pattern
|
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.get_words()
|
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.first()
|
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.map(|s| s.to_string())
|
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.unwrap_or_default();
|
|
|
|
'outer: for block in case_blocks {
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let CaseNode { pattern, body } = block;
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let block_pattern_raw = pattern.span.as_str().trim_end_matches(')').trim();
|
|
// Split at '|' to allow for multiple patterns like `foo|bar)`
|
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let block_patterns = block_pattern_raw.split('|');
|
|
|
|
for pattern in block_patterns {
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|
let pattern_regex = glob_to_regex(pattern, false);
|
|
if pattern_regex.is_match(&pattern_raw) {
|
|
for node in &body {
|
|
s.dispatch_node(node.clone())?;
|
|
}
|
|
break 'outer;
|
|
}
|
|
}
|
|
}
|
|
|
|
Ok(())
|
|
};
|
|
|
|
if fork_builtins {
|
|
log::trace!("Forking builtin: case");
|
|
self.run_fork("case", |s| {
|
|
if let Err(e) = case_logic(s) {
|
|
eprintln!("{e}");
|
|
}
|
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})
|
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} else {
|
|
case_logic(self).try_blame(blame)
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}
|
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}
|
|
fn exec_loop(&mut self, loop_stmt: Node) -> ShResult<()> {
|
|
let blame = loop_stmt.get_span().clone();
|
|
let NdRule::LoopNode { kind, cond_node } = loop_stmt.class else {
|
|
unreachable!();
|
|
};
|
|
let keep_going = |kind: LoopKind, status: i32| -> bool {
|
|
match kind {
|
|
LoopKind::While => status == 0,
|
|
LoopKind::Until => status != 0,
|
|
}
|
|
};
|
|
|
|
let fork_builtins = loop_stmt.flags.contains(NdFlags::FORK_BUILTINS);
|
|
|
|
self.io_stack.append_to_frame(loop_stmt.redirs);
|
|
let _guard = self.io_stack.pop_frame().redirect()?;
|
|
|
|
let loop_logic = |s: &mut Self| -> ShResult<()> {
|
|
let CondNode { cond, body } = cond_node;
|
|
'outer: loop {
|
|
if let Err(e) = s.dispatch_node(*cond.clone()) {
|
|
state::set_status(1);
|
|
return Err(e);
|
|
}
|
|
|
|
let status = state::get_status();
|
|
if keep_going(kind, status) {
|
|
for node in &body {
|
|
if let Err(e) = s.dispatch_node(node.clone()) {
|
|
match e.kind() {
|
|
ShErrKind::LoopBreak(code) => {
|
|
state::set_status(*code);
|
|
break 'outer;
|
|
}
|
|
ShErrKind::LoopContinue(code) => {
|
|
state::set_status(*code);
|
|
continue 'outer;
|
|
}
|
|
_ => {
|
|
return Err(e);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
Ok(())
|
|
};
|
|
|
|
if fork_builtins {
|
|
log::trace!("Forking builtin: loop");
|
|
self.run_fork("loop", |s| {
|
|
if let Err(e) = loop_logic(s) {
|
|
eprintln!("{e}");
|
|
}
|
|
})
|
|
} else {
|
|
loop_logic(self).try_blame(blame)
|
|
}
|
|
}
|
|
fn exec_for(&mut self, for_stmt: Node) -> ShResult<()> {
|
|
let blame = for_stmt.get_span().clone();
|
|
let NdRule::ForNode { vars, arr, body } = for_stmt.class else {
|
|
unreachable!();
|
|
};
|
|
|
|
let fork_builtins = for_stmt.flags.contains(NdFlags::FORK_BUILTINS);
|
|
|
|
let to_expanded_strings = |tks: Vec<Tk>| -> ShResult<Vec<String>> {
|
|
Ok(
|
|
tks
|
|
.into_iter()
|
|
.map(|tk| tk.expand().map(|tk| tk.get_words()))
|
|
.collect::<ShResult<Vec<Vec<String>>>>()?
|
|
.into_iter()
|
|
.flatten()
|
|
.collect::<Vec<_>>(),
|
|
)
|
|
};
|
|
|
|
self.io_stack.append_to_frame(for_stmt.redirs);
|
|
let _guard = self.io_stack.pop_frame().redirect()?;
|
|
|
|
let for_logic = |s: &mut Self| -> ShResult<()> {
|
|
// Expand all array variables
|
|
let arr: Vec<String> = to_expanded_strings(arr)?;
|
|
let vars: Vec<String> = to_expanded_strings(vars)?;
|
|
|
|
let mut for_guard = VarCtxGuard::new(vars.iter().map(|v| v.to_string()).collect());
|
|
|
|
'outer: for chunk in arr.chunks(vars.len()) {
|
|
let empty = String::new();
|
|
let chunk_iter = vars
|
|
.iter()
|
|
.zip(chunk.iter().chain(std::iter::repeat(&empty)));
|
|
|
|
for (var, val) in chunk_iter {
|
|
write_vars(|v| v.set_var(&var.to_string(), &val.to_string(), VarFlags::NONE))?;
|
|
for_guard.vars.insert(var.to_string());
|
|
}
|
|
|
|
for node in body.clone() {
|
|
if let Err(e) = s.dispatch_node(node) {
|
|
match e.kind() {
|
|
ShErrKind::LoopBreak(code) => {
|
|
state::set_status(*code);
|
|
break 'outer;
|
|
}
|
|
ShErrKind::LoopContinue(code) => {
|
|
state::set_status(*code);
|
|
continue 'outer;
|
|
}
|
|
_ => return Err(e),
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
Ok(())
|
|
};
|
|
|
|
if fork_builtins {
|
|
log::trace!("Forking builtin: for");
|
|
self.run_fork("for", |s| {
|
|
if let Err(e) = for_logic(s) {
|
|
eprintln!("{e}");
|
|
}
|
|
})
|
|
} else {
|
|
for_logic(self).try_blame(blame)
|
|
}
|
|
}
|
|
fn exec_if(&mut self, if_stmt: Node) -> ShResult<()> {
|
|
let blame = if_stmt.get_span().clone();
|
|
let NdRule::IfNode {
|
|
cond_nodes,
|
|
else_block,
|
|
} = if_stmt.class
|
|
else {
|
|
unreachable!();
|
|
};
|
|
let fork_builtins = if_stmt.flags.contains(NdFlags::FORK_BUILTINS);
|
|
|
|
self.io_stack.append_to_frame(if_stmt.redirs);
|
|
let _guard = self.io_stack.pop_frame().redirect()?;
|
|
|
|
let if_logic = |s: &mut Self| -> ShResult<()> {
|
|
let mut matched = false;
|
|
for node in cond_nodes {
|
|
let CondNode { cond, body } = node;
|
|
|
|
if let Err(e) = s.dispatch_node(*cond) {
|
|
state::set_status(1);
|
|
return Err(e);
|
|
}
|
|
|
|
match state::get_status() {
|
|
0 => {
|
|
matched = true;
|
|
for body_node in body {
|
|
s.dispatch_node(body_node)?;
|
|
}
|
|
break; // Don't check remaining elif conditions
|
|
}
|
|
_ => continue,
|
|
}
|
|
}
|
|
|
|
if !matched && !else_block.is_empty() {
|
|
for node in else_block {
|
|
s.dispatch_node(node)?;
|
|
}
|
|
}
|
|
|
|
Ok(())
|
|
};
|
|
|
|
if fork_builtins {
|
|
log::trace!("Forking builtin: if");
|
|
self.run_fork("if", |s| {
|
|
if let Err(e) = if_logic(s) {
|
|
eprintln!("{e}");
|
|
state::set_status(1);
|
|
}
|
|
})
|
|
} else {
|
|
if_logic(self).try_blame(blame)
|
|
}
|
|
}
|
|
fn exec_pipeline(&mut self, pipeline: Node) -> ShResult<()> {
|
|
let NdRule::Pipeline { cmds, pipe_err: _ } = pipeline.class else {
|
|
unreachable!()
|
|
};
|
|
self.job_stack.new_job();
|
|
let fork_builtin = cmds.len() > 1; // If there's more than one command, we need to fork builtins
|
|
|
|
// Zip the commands and their respective pipes into an iterator
|
|
let pipes_and_cmds = get_pipe_stack(cmds.len()).into_iter().zip(cmds);
|
|
|
|
for ((rpipe, wpipe), mut cmd) in pipes_and_cmds {
|
|
if let Some(pipe) = rpipe {
|
|
self.io_stack.push_to_frame(pipe);
|
|
}
|
|
if let Some(pipe) = wpipe {
|
|
self.io_stack.push_to_frame(pipe);
|
|
}
|
|
|
|
if fork_builtin {
|
|
cmd.flags |= NdFlags::FORK_BUILTINS;
|
|
}
|
|
self.dispatch_node(cmd)?;
|
|
}
|
|
let job = self.job_stack.finalize_job().unwrap();
|
|
let is_bg = pipeline.flags.contains(NdFlags::BACKGROUND);
|
|
dispatch_job(job, is_bg)?;
|
|
Ok(())
|
|
}
|
|
fn exec_builtin(&mut self, cmd: Node) -> ShResult<()> {
|
|
let fork_builtins = cmd.flags.contains(NdFlags::FORK_BUILTINS);
|
|
let cmd_raw = cmd.get_command().unwrap_or_else(|| panic!("expected command NdRule, got {:?}", &cmd.class)).to_string();
|
|
|
|
if fork_builtins {
|
|
log::trace!("Forking builtin: {}", cmd_raw);
|
|
let _guard = self.io_stack.pop_frame().redirect()?;
|
|
self.run_fork(&cmd_raw, |s| {
|
|
if let Err(e) = s.dispatch_builtin(cmd) {
|
|
eprintln!("{e}");
|
|
}
|
|
})
|
|
} else {
|
|
let result = self.dispatch_builtin(cmd);
|
|
|
|
if let Err(e) = result {
|
|
let code = state::get_status();
|
|
if code == 0 {
|
|
state::set_status(1);
|
|
}
|
|
return Err(e);
|
|
}
|
|
Ok(())
|
|
}
|
|
}
|
|
fn dispatch_builtin(&mut self, mut cmd: Node) -> ShResult<()> {
|
|
let cmd_raw = cmd.get_command().unwrap().to_string();
|
|
let NdRule::Command { assignments, argv } = &mut cmd.class else {
|
|
unreachable!()
|
|
};
|
|
let env_vars = self.set_assignments(mem::take(assignments), AssignBehavior::Export)?;
|
|
let _var_guard = VarCtxGuard::new(env_vars.into_iter().collect());
|
|
|
|
let curr_job_mut = self.job_stack.curr_job_mut().unwrap();
|
|
let io_stack_mut = &mut self.io_stack;
|
|
if cmd_raw.as_str() == "builtin" {
|
|
*argv = argv
|
|
.iter_mut()
|
|
.skip(1)
|
|
.map(|tk| tk.clone())
|
|
.collect::<Vec<Tk>>();
|
|
return self.exec_builtin(cmd);
|
|
} else if cmd_raw.as_str() == "command" {
|
|
*argv = argv
|
|
.iter_mut()
|
|
.skip(1)
|
|
.map(|tk| tk.clone())
|
|
.collect::<Vec<Tk>>();
|
|
if cmd.flags.contains(NdFlags::FORK_BUILTINS) {
|
|
cmd.flags |= NdFlags::NO_FORK;
|
|
}
|
|
return self.exec_cmd(cmd);
|
|
}
|
|
match cmd_raw.as_str() {
|
|
"echo" => echo(cmd, io_stack_mut, curr_job_mut),
|
|
"cd" => cd(cmd, curr_job_mut),
|
|
"export" => export(cmd, io_stack_mut, curr_job_mut),
|
|
"local" => local(cmd, io_stack_mut, curr_job_mut),
|
|
"pwd" => pwd(cmd, io_stack_mut, curr_job_mut),
|
|
"source" => source(cmd, curr_job_mut),
|
|
"shift" => shift(cmd, curr_job_mut),
|
|
"fg" => continue_job(cmd, curr_job_mut, JobBehavior::Foregound),
|
|
"bg" => continue_job(cmd, curr_job_mut, JobBehavior::Background),
|
|
"disown" => disown(cmd, io_stack_mut, curr_job_mut),
|
|
"jobs" => jobs(cmd, io_stack_mut, curr_job_mut),
|
|
"alias" => alias(cmd, io_stack_mut, curr_job_mut),
|
|
"unalias" => unalias(cmd, io_stack_mut, curr_job_mut),
|
|
"return" => flowctl(cmd, ShErrKind::FuncReturn(0)),
|
|
"break" => flowctl(cmd, ShErrKind::LoopBreak(0)),
|
|
"continue" => flowctl(cmd, ShErrKind::LoopContinue(0)),
|
|
"exit" => flowctl(cmd, ShErrKind::CleanExit(0)),
|
|
"zoltraak" => zoltraak(cmd, io_stack_mut, curr_job_mut),
|
|
"shopt" => shopt(cmd, io_stack_mut, curr_job_mut),
|
|
"read" => read_builtin(cmd, io_stack_mut, curr_job_mut),
|
|
"trap" => trap(cmd, io_stack_mut, curr_job_mut),
|
|
"pushd" => pushd(cmd, io_stack_mut, curr_job_mut),
|
|
"popd" => popd(cmd, io_stack_mut, curr_job_mut),
|
|
"dirs" => dirs(cmd, io_stack_mut, curr_job_mut),
|
|
"exec" => exec::exec_builtin(cmd, io_stack_mut, curr_job_mut),
|
|
"eval" => eval::eval(cmd, io_stack_mut, curr_job_mut),
|
|
"readonly" => readonly(cmd, io_stack_mut, curr_job_mut),
|
|
"unset" => unset(cmd, io_stack_mut, curr_job_mut),
|
|
"true" | ":" => {
|
|
state::set_status(0);
|
|
Ok(())
|
|
},
|
|
"false" => {
|
|
state::set_status(1);
|
|
Ok(())
|
|
},
|
|
_ => unimplemented!(
|
|
"Have not yet added support for builtin '{}'",
|
|
cmd_raw
|
|
),
|
|
}
|
|
}
|
|
fn exec_cmd(&mut self, cmd: Node) -> ShResult<()> {
|
|
let NdRule::Command { assignments, argv } = cmd.class else {
|
|
unreachable!()
|
|
};
|
|
let mut env_vars_to_unset = vec![];
|
|
if !assignments.is_empty() {
|
|
let assign_behavior = if argv.is_empty() {
|
|
AssignBehavior::Set
|
|
} else {
|
|
AssignBehavior::Export
|
|
};
|
|
env_vars_to_unset = self.set_assignments(assignments, assign_behavior)?;
|
|
}
|
|
|
|
let no_fork = cmd.flags.contains(NdFlags::NO_FORK);
|
|
|
|
if argv.is_empty() {
|
|
return Ok(());
|
|
}
|
|
|
|
self.io_stack.append_to_frame(cmd.redirs);
|
|
|
|
let exec_args = ExecArgs::new(argv)?;
|
|
let _guard = self.io_stack.pop_frame().redirect()?;
|
|
let job = self.job_stack.curr_job_mut().unwrap();
|
|
|
|
let child_logic = || -> ! {
|
|
let cmd = &exec_args.cmd.0;
|
|
let span = exec_args.cmd.1;
|
|
|
|
let Err(e) = execvpe(cmd, &exec_args.argv, &exec_args.envp);
|
|
|
|
// execvpe only returns on error
|
|
let cmd_str = cmd.to_str().unwrap().to_string();
|
|
match e {
|
|
Errno::ENOENT => {
|
|
let err = ShErr::full(ShErrKind::CmdNotFound(cmd_str), "", span);
|
|
eprintln!("{err}");
|
|
}
|
|
_ => {
|
|
let err = ShErr::full(ShErrKind::Errno(e), format!("{e}"), span);
|
|
eprintln!("{err}");
|
|
}
|
|
}
|
|
exit(e as i32)
|
|
};
|
|
|
|
if no_fork {
|
|
child_logic();
|
|
}
|
|
|
|
match unsafe { fork()? } {
|
|
ForkResult::Child => child_logic(),
|
|
ForkResult::Parent { child } => {
|
|
// Close proc sub pipe fds - the child has inherited them
|
|
// and will access them via /proc/self/fd/N. Keeping them
|
|
// open here would prevent EOF on the pipe.
|
|
write_jobs(|j| j.drain_registered_fds());
|
|
|
|
let cmd_name = exec_args.cmd.0.to_str().unwrap();
|
|
|
|
let child_pgid = if let Some(pgid) = job.pgid() {
|
|
pgid
|
|
} else {
|
|
job.set_pgid(child);
|
|
child
|
|
};
|
|
let child_proc = ChildProc::new(child, Some(cmd_name), Some(child_pgid))?;
|
|
job.push_child(child_proc);
|
|
}
|
|
}
|
|
|
|
for var in env_vars_to_unset {
|
|
unsafe { std::env::set_var(&var, "") };
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
fn run_fork(&mut self, name: &str, f: impl FnOnce(&mut Self)) -> ShResult<()> {
|
|
match unsafe { fork()? } {
|
|
ForkResult::Child => {
|
|
f(self);
|
|
exit(state::get_status())
|
|
}
|
|
ForkResult::Parent { child } => {
|
|
write_jobs(|j| j.drain_registered_fds());
|
|
let job = self.job_stack.curr_job_mut().unwrap();
|
|
let child_pgid = if let Some(pgid) = job.pgid() {
|
|
pgid
|
|
} else {
|
|
job.set_pgid(child);
|
|
child
|
|
};
|
|
let child_proc = ChildProc::new(child, Some(name), Some(child_pgid))?;
|
|
job.push_child(child_proc);
|
|
Ok(())
|
|
}
|
|
}
|
|
}
|
|
fn set_assignments(&self, assigns: Vec<Node>, behavior: AssignBehavior) -> ShResult<Vec<String>> {
|
|
let mut new_env_vars = vec![];
|
|
match behavior {
|
|
AssignBehavior::Export => {
|
|
for assign in assigns {
|
|
let NdRule::Assignment { kind, var, val } = assign.class else {
|
|
unreachable!()
|
|
};
|
|
let var = var.span.as_str();
|
|
let val = val.expand()?.get_words().join(" ");
|
|
match kind {
|
|
AssignKind::Eq => write_vars(|v| v.set_var(var, &val, VarFlags::EXPORT))?,
|
|
AssignKind::PlusEq => todo!(),
|
|
AssignKind::MinusEq => todo!(),
|
|
AssignKind::MultEq => todo!(),
|
|
AssignKind::DivEq => todo!(),
|
|
}
|
|
new_env_vars.push(var.to_string());
|
|
}
|
|
}
|
|
AssignBehavior::Set => {
|
|
for assign in assigns {
|
|
let NdRule::Assignment { kind, var, val } = assign.class else {
|
|
unreachable!()
|
|
};
|
|
let var = var.span.as_str();
|
|
let val = val.expand()?.get_words().join(" ");
|
|
match kind {
|
|
AssignKind::Eq => write_vars(|v| v.set_var(var, &val, VarFlags::NONE))?,
|
|
AssignKind::PlusEq => todo!(),
|
|
AssignKind::MinusEq => todo!(),
|
|
AssignKind::MultEq => todo!(),
|
|
AssignKind::DivEq => todo!(),
|
|
}
|
|
}
|
|
}
|
|
}
|
|
Ok(new_env_vars)
|
|
}
|
|
}
|
|
|
|
pub fn prepare_argv(argv: Vec<Tk>) -> ShResult<Vec<(String, Span)>> {
|
|
let mut args = vec![];
|
|
|
|
for arg in argv {
|
|
let span = arg.span.clone();
|
|
let expanded = arg.expand()?;
|
|
for exp in expanded.get_words() {
|
|
args.push((exp, span.clone()))
|
|
}
|
|
}
|
|
Ok(args)
|
|
}
|
|
|
|
/// Initialize the pipes for a pipeline
|
|
/// The first command gets `(None, WPipe)`
|
|
/// The last command gets `(RPipe, None)`
|
|
/// Commands inbetween get `(RPipe, WPipe)`
|
|
/// If there is only one command, it gets `(None, None)`
|
|
pub fn get_pipe_stack(num_cmds: usize) -> Vec<(Option<Redir>, Option<Redir>)> {
|
|
let mut stack = Vec::with_capacity(num_cmds);
|
|
let mut prev_read: Option<Redir> = None;
|
|
|
|
for i in 0..num_cmds {
|
|
if i == num_cmds - 1 {
|
|
stack.push((prev_read.take(), None));
|
|
} else {
|
|
let (rpipe, wpipe) = IoMode::get_pipes();
|
|
let r_redir = Redir::new(rpipe, RedirType::Input);
|
|
let w_redir = Redir::new(wpipe, RedirType::Output);
|
|
|
|
// Push (prev_read, Some(w_redir)) and set prev_read to r_redir
|
|
stack.push((prev_read.take(), Some(w_redir)));
|
|
prev_read = Some(r_redir);
|
|
}
|
|
}
|
|
stack
|
|
}
|
|
|
|
pub fn is_func(tk: Option<Tk>) -> bool {
|
|
let Some(tk) = tk else { return false };
|
|
read_logic(|l| l.get_func(&tk.to_string())).is_some()
|
|
}
|
|
|
|
pub fn is_subsh(tk: Option<Tk>) -> bool {
|
|
tk.is_some_and(|tk| tk.flags.contains(TkFlags::IS_SUBSH))
|
|
}
|