Mercurial > hg-stable
changeset 44857:f365dfede78f
merge with stable
| author | Augie Fackler <augie@google.com> |
|---|---|
| date | Fri, 24 Apr 2020 15:06:42 -0400 |
| parents | 27fe8cc1338f (diff) a467416c493c (current diff) |
| children | 45f3f35cefe7 |
| files | |
| diffstat | 17 files changed, 510 insertions(+), 937 deletions(-) [+] |
line wrap: on
line diff
--- a/mercurial/localrepo.py Thu Apr 23 09:59:38 2020 +0200 +++ b/mercurial/localrepo.py Fri Apr 24 15:06:42 2020 -0400 @@ -3016,6 +3016,12 @@ self.ui.write( _(b'note: commit message saved in %s\n') % msgfn ) + self.ui.write( + _( + b"note: use 'hg commit --logfile " + b".hg/last-message.txt --edit' to reuse it\n" + ) + ) raise def commithook(unused_success):
--- a/rust/chg/Cargo.lock Thu Apr 23 09:59:38 2020 +0200 +++ b/rust/chg/Cargo.lock Fri Apr 24 15:06:42 2020 -0400 @@ -6,9 +6,14 @@ source = "registry+https://github.com/rust-lang/crates.io-index" [[package]] -name = "autocfg" -version = "1.0.0" +name = "async-trait" +version = "0.1.30" source = "registry+https://github.com/rust-lang/crates.io-index" +dependencies = [ + "proc-macro2 1.0.10 (registry+https://github.com/rust-lang/crates.io-index)", + "quote 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)", + "syn 1.0.17 (registry+https://github.com/rust-lang/crates.io-index)", +] [[package]] name = "bitflags" @@ -16,20 +21,11 @@ source = "registry+https://github.com/rust-lang/crates.io-index" [[package]] -name = "byteorder" -version = "1.3.4" +name = "bytes" +version = "0.5.4" source = "registry+https://github.com/rust-lang/crates.io-index" [[package]] -name = "bytes" -version = "0.4.12" -source = "registry+https://github.com/rust-lang/crates.io-index" -dependencies = [ - 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--- a/rust/chg/Cargo.toml Thu Apr 23 09:59:38 2020 +0200 +++ b/rust/chg/Cargo.toml Fri Apr 24 15:06:42 2020 -0400 @@ -7,14 +7,16 @@ edition = "2018" [dependencies] -bytes = "0.4" -futures = "0.1" +async-trait = "0.1" +bytes = "0.5" +futures = "0.3" libc = "0.2" log = { version = "0.4", features = ["std"] } -tokio = "0.1" -tokio-hglib = "0.2" -tokio-process = "0.2.3" -tokio-timer = "0.2" +tokio-hglib = "0.3" + +[dependencies.tokio] +version = "0.2" +features = ["rt-core", "io-util", "time", "process", "macros"] [build-dependencies] cc = "1.0"
--- a/rust/chg/src/attachio.rs Thu Apr 23 09:59:38 2020 +0200 +++ b/rust/chg/src/attachio.rs Fri Apr 24 15:06:42 2020 -0400 @@ -5,17 +5,15 @@ //! Functions to send client-side fds over the command server channel. -use futures::{try_ready, Async, Future, Poll}; use std::io; use std::os::unix::io::AsRawFd; use tokio_hglib::codec::ChannelMessage; -use tokio_hglib::protocol::MessageLoop; -use tokio_hglib::{Client, Connection}; +use tokio_hglib::{Connection, Protocol}; use crate::message; use crate::procutil; -/// Future to send client-side fds over the command server channel. +/// Sends client-side fds over the command server channel. /// /// This works as follows: /// 1. Client sends "attachio" request. @@ -23,92 +21,48 @@ /// 3. Client sends fds with 1-byte dummy payload in response. /// 4. Server returns the number of the fds received. /// -/// If the stderr is omitted, it will be redirected to the stdout. This -/// allows us to attach the pager stdin to both stdout and stderr, and -/// dispose of the client-side handle once attached. -#[must_use = "futures do nothing unless polled"] -pub struct AttachIo<C, I, O, E> -where - C: Connection, -{ - msg_loop: MessageLoop<C>, - stdin: I, - stdout: O, - stderr: Option<E>, -} - -impl<C, I, O, E> AttachIo<C, I, O, E> -where - C: Connection + AsRawFd, - I: AsRawFd, - O: AsRawFd, - E: AsRawFd, -{ - pub fn with_client( - client: Client<C>, - stdin: I, - stdout: O, - stderr: Option<E>, - ) -> AttachIo<C, I, O, E> { - let msg_loop = MessageLoop::start(client, b"attachio"); - AttachIo { - msg_loop, - stdin, - stdout, - stderr, - } - } -} - -impl<C, I, O, E> Future for AttachIo<C, I, O, E> -where - C: Connection + AsRawFd, - I: AsRawFd, - O: AsRawFd, - E: AsRawFd, -{ - type Item = Client<C>; - type Error = io::Error; - - fn poll(&mut self) -> Poll<Self::Item, Self::Error> { - loop { - let (client, msg) = try_ready!(self.msg_loop.poll()); - match msg { - ChannelMessage::Data(b'r', data) => { - let fd_cnt = message::parse_result_code(data)?; - if fd_cnt == 3 { - return Ok(Async::Ready(client)); - } else { - return Err(io::Error::new( - io::ErrorKind::InvalidData, - "unexpected attachio result", - )); - } - } - ChannelMessage::Data(..) => { - // just ignore data sent to uninteresting (optional) channel - self.msg_loop = MessageLoop::resume(client); - } - ChannelMessage::InputRequest(1) => { - // this may fail with EWOULDBLOCK in theory, but the - // payload is quite small, and the send buffer should - // be empty so the operation will complete immediately - let sock_fd = client.as_raw_fd(); - let ifd = self.stdin.as_raw_fd(); - let ofd = self.stdout.as_raw_fd(); - let efd = self.stderr.as_ref().map_or(ofd, |f| f.as_raw_fd()); - procutil::send_raw_fds(sock_fd, &[ifd, ofd, efd])?; - self.msg_loop = MessageLoop::resume(client); - } - ChannelMessage::InputRequest(..) - | ChannelMessage::LineRequest(..) - | ChannelMessage::SystemRequest(..) => { +/// The client-side fds may be dropped once duplicated to the server. +pub async fn attach_io( + proto: &mut Protocol<impl Connection + AsRawFd>, + stdin: &impl AsRawFd, + stdout: &impl AsRawFd, + stderr: &impl AsRawFd, +) -> io::Result<()> { + proto.send_command("attachio").await?; + loop { + match proto.fetch_response().await? { + ChannelMessage::Data(b'r', data) => { + let fd_cnt = message::parse_result_code(data)?; + if fd_cnt == 3 { + return Ok(()); + } else { return Err(io::Error::new( io::ErrorKind::InvalidData, - "unsupported request while attaching io", + "unexpected attachio result", )); } } + ChannelMessage::Data(..) => { + // just ignore data sent to uninteresting (optional) channel + } + ChannelMessage::InputRequest(1) => { + // this may fail with EWOULDBLOCK in theory, but the + // payload is quite small, and the send buffer should + // be empty so the operation will complete immediately + let sock_fd = proto.as_raw_fd(); + let ifd = stdin.as_raw_fd(); + let ofd = stdout.as_raw_fd(); + let efd = stderr.as_raw_fd(); + procutil::send_raw_fds(sock_fd, &[ifd, ofd, efd])?; + } + ChannelMessage::InputRequest(..) + | ChannelMessage::LineRequest(..) + | ChannelMessage::SystemRequest(..) => { + return Err(io::Error::new( + io::ErrorKind::InvalidData, + "unsupported request while attaching io", + )); + } } } }
--- a/rust/chg/src/clientext.rs Thu Apr 23 09:59:38 2020 +0200 +++ b/rust/chg/src/clientext.rs Fri Apr 24 15:06:42 2020 -0400 @@ -5,55 +5,99 @@ //! cHg extensions to command server client. -use bytes::{BufMut, Bytes, BytesMut}; +use bytes::{BufMut, BytesMut}; use std::ffi::OsStr; use std::io; use std::mem; use std::os::unix::ffi::OsStrExt; use std::os::unix::io::AsRawFd; use std::path::Path; -use tokio_hglib::protocol::{OneShotQuery, OneShotRequest}; -use tokio_hglib::{Client, Connection}; +use tokio_hglib::UnixClient; -use crate::attachio::AttachIo; -use crate::message::{self, Instruction}; -use crate::runcommand::ChgRunCommand; +use crate::attachio; +use crate::message::{self, Instruction, ServerSpec}; +use crate::runcommand; use crate::uihandler::SystemHandler; -pub trait ChgClientExt<C> -where - C: Connection + AsRawFd, -{ +/// Command-server client that also supports cHg extensions. +pub struct ChgClient { + client: UnixClient, +} + +impl ChgClient { + /// Connects to a command server listening at the specified socket path. + pub async fn connect(path: impl AsRef<Path>) -> io::Result<Self> { + let client = UnixClient::connect(path).await?; + Ok(ChgClient { client }) + } + + /// Server capabilities, encoding, etc. + pub fn server_spec(&self) -> &ServerSpec { + self.client.server_spec() + } + /// Attaches the client file descriptors to the server. - fn attach_io<I, O, E>(self, stdin: I, stdout: O, stderr: E) -> AttachIo<C, I, O, E> - where - I: AsRawFd, - O: AsRawFd, - E: AsRawFd; + pub async fn attach_io( + &mut self, + stdin: &impl AsRawFd, + stdout: &impl AsRawFd, + stderr: &impl AsRawFd, + ) -> io::Result<()> { + attachio::attach_io(self.client.borrow_protocol_mut(), stdin, stdout, stderr).await + } /// Changes the working directory of the server. - fn set_current_dir(self, dir: impl AsRef<Path>) -> OneShotRequest<C>; + pub async fn set_current_dir(&mut self, dir: impl AsRef<Path>) -> io::Result<()> { + let dir_bytes = dir.as_ref().as_os_str().as_bytes().to_owned(); + self.client + .borrow_protocol_mut() + .send_command_with_args("chdir", dir_bytes) + .await + } /// Updates the environment variables of the server. - fn set_env_vars_os( - self, + pub async fn set_env_vars_os( + &mut self, vars: impl IntoIterator<Item = (impl AsRef<OsStr>, impl AsRef<OsStr>)>, - ) -> OneShotRequest<C>; + ) -> io::Result<()> { + self.client + .borrow_protocol_mut() + .send_command_with_args("setenv", message::pack_env_vars_os(vars)) + .await + } /// Changes the process title of the server. - fn set_process_name(self, name: impl AsRef<OsStr>) -> OneShotRequest<C>; + pub async fn set_process_name(&mut self, name: impl AsRef<OsStr>) -> io::Result<()> { + let name_bytes = name.as_ref().as_bytes().to_owned(); + self.client + .borrow_protocol_mut() + .send_command_with_args("setprocname", name_bytes) + .await + } /// Changes the umask of the server process. - fn set_umask(self, mask: u32) -> OneShotRequest<C>; + pub async fn set_umask(&mut self, mask: u32) -> io::Result<()> { + let mut mask_bytes = BytesMut::with_capacity(mem::size_of_val(&mask)); + mask_bytes.put_u32(mask); + self.client + .borrow_protocol_mut() + .send_command_with_args("setumask2", mask_bytes) + .await + } /// Runs the specified Mercurial command with cHg extension. - fn run_command_chg<H>( - self, - handler: H, + pub async fn run_command_chg( + &mut self, + handler: &mut impl SystemHandler, args: impl IntoIterator<Item = impl AsRef<OsStr>>, - ) -> ChgRunCommand<C, H> - where - H: SystemHandler; + ) -> io::Result<i32> { + runcommand::run_command( + self.client.borrow_protocol_mut(), + handler, + message::pack_args_os(args), + ) + .await + } /// Validates if the server can run Mercurial commands with the expected /// configuration. @@ -63,66 +107,15 @@ /// /// Client-side environment must be sent prior to this request, by /// `set_current_dir()` and `set_env_vars_os()`. - fn validate( - self, + pub async fn validate( + &mut self, args: impl IntoIterator<Item = impl AsRef<OsStr>>, - ) -> OneShotQuery<C, fn(Bytes) -> io::Result<Vec<Instruction>>>; -} - -impl<C> ChgClientExt<C> for Client<C> -where - C: Connection + AsRawFd, -{ - fn attach_io<I, O, E>(self, stdin: I, stdout: O, stderr: E) -> AttachIo<C, I, O, E> - where - I: AsRawFd, - O: AsRawFd, - E: AsRawFd, - { - AttachIo::with_client(self, stdin, stdout, Some(stderr)) - } - - fn set_current_dir(self, dir: impl AsRef<Path>) -> OneShotRequest<C> { - OneShotRequest::start_with_args(self, b"chdir", dir.as_ref().as_os_str().as_bytes()) - } - - fn set_env_vars_os( - self, - vars: impl IntoIterator<Item = (impl AsRef<OsStr>, impl AsRef<OsStr>)>, - ) -> OneShotRequest<C> { - OneShotRequest::start_with_args(self, b"setenv", message::pack_env_vars_os(vars)) - } - - fn set_process_name(self, name: impl AsRef<OsStr>) -> OneShotRequest<C> { - OneShotRequest::start_with_args(self, b"setprocname", name.as_ref().as_bytes()) - } - - fn set_umask(self, mask: u32) -> OneShotRequest<C> { - let mut args = BytesMut::with_capacity(mem::size_of_val(&mask)); - args.put_u32_be(mask); - OneShotRequest::start_with_args(self, b"setumask2", args) - } - - fn run_command_chg<H>( - self, - handler: H, - args: impl IntoIterator<Item = impl AsRef<OsStr>>, - ) -> ChgRunCommand<C, H> - where - H: SystemHandler, - { - ChgRunCommand::with_client(self, handler, message::pack_args_os(args)) - } - - fn validate( - self, - args: impl IntoIterator<Item = impl AsRef<OsStr>>, - ) -> OneShotQuery<C, fn(Bytes) -> io::Result<Vec<Instruction>>> { - OneShotQuery::start_with_args( - self, - b"validate", - message::pack_args_os(args), - message::parse_instructions, - ) + ) -> io::Result<Vec<Instruction>> { + let data = self + .client + .borrow_protocol_mut() + .query_with_args("validate", message::pack_args_os(args)) + .await?; + message::parse_instructions(data) } }
--- a/rust/chg/src/lib.rs Thu Apr 23 09:59:38 2020 +0200 +++ b/rust/chg/src/lib.rs Fri Apr 24 15:06:42 2020 -0400 @@ -11,5 +11,5 @@ mod runcommand; mod uihandler; -pub use clientext::ChgClientExt; +pub use clientext::ChgClient; pub use uihandler::{ChgUiHandler, SystemHandler};
--- a/rust/chg/src/locator.rs Thu Apr 23 09:59:38 2020 +0200 +++ b/rust/chg/src/locator.rs Fri Apr 24 15:06:42 2020 -0400 @@ -5,7 +5,6 @@ //! Utility for locating command-server process. -use futures::future::{self, Either, Loop}; use log::debug; use std::env; use std::ffi::{OsStr, OsString}; @@ -14,14 +13,11 @@ use std::os::unix::ffi::{OsStrExt, OsStringExt}; use std::os::unix::fs::{DirBuilderExt, MetadataExt}; use std::path::{Path, PathBuf}; -use std::process::{self, Command}; -use std::time::Duration; -use tokio::prelude::*; -use tokio_hglib::UnixClient; -use tokio_process::{Child, CommandExt}; -use tokio_timer; +use std::process::{self, Child, Command}; +use std::time::{Duration, Instant}; +use tokio::time; -use crate::clientext::ChgClientExt; +use crate::clientext::ChgClient; use crate::message::{Instruction, ServerSpec}; use crate::procutil; @@ -82,43 +78,33 @@ /// Connects to the server. /// /// The server process will be spawned if not running. - pub fn connect(self) -> impl Future<Item = (Self, UnixClient), Error = io::Error> { - future::loop_fn((self, 0), |(loc, cnt)| { - if cnt < 10 { - let fut = loc - .try_connect() - .and_then(|(loc, client)| { - client - .validate(&loc.hg_early_args) - .map(|(client, instructions)| (loc, client, instructions)) - }) - .and_then(move |(loc, client, instructions)| { - loc.run_instructions(client, instructions, cnt) - }); - Either::A(fut) - } else { - let msg = format!( - concat!( - "too many redirections.\n", - "Please make sure {:?} is not a wrapper which ", - "changes sensitive environment variables ", - "before executing hg. If you have to use a ", - "wrapper, wrap chg instead of hg.", - ), - loc.hg_command - ); - Either::B(future::err(io::Error::new(io::ErrorKind::Other, msg))) + pub async fn connect(&mut self) -> io::Result<ChgClient> { + for _cnt in 0..10 { + let mut client = self.try_connect().await?; + let instructions = client.validate(&self.hg_early_args).await?; + let reconnect = self.run_instructions(&instructions)?; + if !reconnect { + return Ok(client); } - }) + } + + let msg = format!( + concat!( + "too many redirections.\n", + "Please make sure {:?} is not a wrapper which ", + "changes sensitive environment variables ", + "before executing hg. If you have to use a ", + "wrapper, wrap chg instead of hg.", + ), + self.hg_command + ); + Err(io::Error::new(io::ErrorKind::Other, msg)) } /// Runs instructions received from the server. - fn run_instructions( - mut self, - client: UnixClient, - instructions: Vec<Instruction>, - cnt: usize, - ) -> io::Result<Loop<(Self, UnixClient), (Self, usize)>> { + /// + /// Returns true if the client should try connecting to the other server. + fn run_instructions(&mut self, instructions: &[Instruction]) -> io::Result<bool> { let mut reconnect = false; for inst in instructions { debug!("instruction: {:?}", inst); @@ -126,7 +112,7 @@ Instruction::Exit(_) => { // Just returns the current connection to run the // unparsable command and report the error - return Ok(Loop::Break((self, client))); + return Ok(false); } Instruction::Reconnect => { reconnect = true; @@ -139,7 +125,7 @@ ); return Err(io::Error::new(io::ErrorKind::InvalidData, msg)); } - self.redirect_sock_path = Some(path); + self.redirect_sock_path = Some(path.to_owned()); reconnect = true; } Instruction::Unlink(path) => { @@ -155,64 +141,44 @@ } } - if reconnect { - Ok(Loop::Continue((self, cnt + 1))) - } else { - Ok(Loop::Break((self, client))) - } + Ok(reconnect) } /// Tries to connect to the existing server, or spawns new if not running. - fn try_connect(self) -> impl Future<Item = (Self, UnixClient), Error = io::Error> { + async fn try_connect(&mut self) -> io::Result<ChgClient> { let sock_path = self .redirect_sock_path .as_ref() .unwrap_or(&self.base_sock_path) .clone(); debug!("try connect to {}", sock_path.display()); - UnixClient::connect(sock_path) - .then(|res| { - match res { - Ok(client) => Either::A(future::ok((self, client))), - Err(_) => { - // Prevent us from being re-connected to the outdated - // master server: We were told by the server to redirect - // to redirect_sock_path, which didn't work. We do not - // want to connect to the same master server again - // because it would probably tell us the same thing. - if self.redirect_sock_path.is_some() { - fs::remove_file(&self.base_sock_path).unwrap_or(()); - // may race - } - Either::B(self.spawn_connect()) - } + let mut client = match ChgClient::connect(sock_path).await { + Ok(client) => client, + Err(_) => { + // Prevent us from being re-connected to the outdated + // master server: We were told by the server to redirect + // to redirect_sock_path, which didn't work. We do not + // want to connect to the same master server again + // because it would probably tell us the same thing. + if self.redirect_sock_path.is_some() { + fs::remove_file(&self.base_sock_path).unwrap_or(()); + // may race } - }) - .and_then(|(loc, client)| { - check_server_capabilities(client.server_spec())?; - Ok((loc, client)) - }) - .and_then(|(loc, client)| { - // It's purely optional, and the server might not support this command. - if client.server_spec().capabilities.contains("setprocname") { - let fut = client - .set_process_name(format!("chg[worker/{}]", loc.process_id)) - .map(|client| (loc, client)); - Either::A(fut) - } else { - Either::B(future::ok((loc, client))) - } - }) - .and_then(|(loc, client)| { - client - .set_current_dir(&loc.current_dir) - .map(|client| (loc, client)) - }) - .and_then(|(loc, client)| { - client - .set_env_vars_os(loc.env_vars.iter().cloned()) - .map(|client| (loc, client)) - }) + self.spawn_connect().await? + } + }; + check_server_capabilities(client.server_spec())?; + // It's purely optional, and the server might not support this command. + if client.server_spec().capabilities.contains("setprocname") { + client + .set_process_name(format!("chg[worker/{}]", self.process_id)) + .await?; + } + client.set_current_dir(&self.current_dir).await?; + client + .set_env_vars_os(self.env_vars.iter().cloned()) + .await?; + Ok(client) } /// Spawns new server process and connects to it. @@ -220,10 +186,10 @@ /// The server will be spawned at the current working directory, then /// chdir to "/", so that the server will load configs from the target /// repository. - fn spawn_connect(self) -> impl Future<Item = (Self, UnixClient), Error = io::Error> { + async fn spawn_connect(&mut self) -> io::Result<ChgClient> { let sock_path = self.temp_sock_path(); debug!("start cmdserver at {}", sock_path.display()); - Command::new(&self.hg_command) + let server = Command::new(&self.hg_command) .arg("serve") .arg("--cmdserver") .arg("chgunix") @@ -236,68 +202,49 @@ .env_clear() .envs(self.env_vars.iter().cloned()) .env("CHGINTERNALMARK", "") - .spawn_async() - .into_future() - .and_then(|server| self.connect_spawned(server, sock_path)) - .and_then(|(loc, client, sock_path)| { - debug!( - "rename {} to {}", - sock_path.display(), - loc.base_sock_path.display() - ); - fs::rename(&sock_path, &loc.base_sock_path)?; - Ok((loc, client)) - }) + .spawn()?; + let client = self.connect_spawned(server, &sock_path).await?; + debug!( + "rename {} to {}", + sock_path.display(), + self.base_sock_path.display() + ); + fs::rename(&sock_path, &self.base_sock_path)?; + Ok(client) } /// Tries to connect to the just spawned server repeatedly until timeout /// exceeded. - fn connect_spawned( - self, - server: Child, - sock_path: PathBuf, - ) -> impl Future<Item = (Self, UnixClient, PathBuf), Error = io::Error> { + async fn connect_spawned( + &mut self, + mut server: Child, + sock_path: &Path, + ) -> io::Result<ChgClient> { debug!("try connect to {} repeatedly", sock_path.display()); - let connect = future::loop_fn(sock_path, |sock_path| { - UnixClient::connect(sock_path.clone()).then(|res| { - match res { - Ok(client) => Either::A(future::ok(Loop::Break((client, sock_path)))), - Err(_) => { - // try again with slight delay - let fut = tokio_timer::sleep(Duration::from_millis(10)) - .map(|()| Loop::Continue(sock_path)) - .map_err(|err| io::Error::new(io::ErrorKind::Other, err)); - Either::B(fut) - } - } - }) - }); - // waits for either connection established or server failed to start - connect - .select2(server) - .map_err(|res| res.split().0) - .timeout(self.timeout) - .map_err(|err| { - err.into_inner().unwrap_or_else(|| { - io::Error::new( - io::ErrorKind::TimedOut, - "timed out while connecting to server", - ) - }) - }) - .and_then(|res| { - match res { - Either::A(((client, sock_path), server)) => { - server.forget(); // continue to run in background - Ok((self, client, sock_path)) - } - Either::B((st, _)) => Err(io::Error::new( - io::ErrorKind::Other, - format!("server exited too early: {}", st), - )), - } - }) + let start_time = Instant::now(); + while start_time.elapsed() < self.timeout { + if let Ok(client) = ChgClient::connect(&sock_path).await { + // server handle is dropped here, but the detached process + // will continue running in background + return Ok(client); + } + + if let Some(st) = server.try_wait()? { + return Err(io::Error::new( + io::ErrorKind::Other, + format!("server exited too early: {}", st), + )); + } + + // try again with slight delay + time::delay_for(Duration::from_millis(10)).await; + } + + Err(io::Error::new( + io::ErrorKind::TimedOut, + "timed out while connecting to server", + )) } }
--- a/rust/chg/src/main.rs Thu Apr 23 09:59:38 2020 +0200 +++ b/rust/chg/src/main.rs Fri Apr 24 15:06:42 2020 -0400 @@ -5,13 +5,12 @@ use chg::locator::{self, Locator}; use chg::procutil; -use chg::{ChgClientExt, ChgUiHandler}; -use futures::sync::oneshot; +use chg::ChgUiHandler; use std::env; use std::io; +use std::io::Write; use std::process; use std::time::Instant; -use tokio::prelude::*; struct DebugLogger { start: Instant, @@ -67,31 +66,23 @@ process::exit(code); } -fn run(umask: u32) -> io::Result<i32> { +#[tokio::main] +async fn run(umask: u32) -> io::Result<i32> { let mut loc = Locator::prepare_from_env()?; loc.set_early_args(locator::collect_early_args(env::args_os().skip(1))); - let handler = ChgUiHandler::new(); - let (result_tx, result_rx) = oneshot::channel(); - let fut = loc - .connect() - .and_then(|(_, client)| client.attach_io(io::stdin(), io::stdout(), io::stderr())) - .and_then(move |client| client.set_umask(umask)) - .and_then(|client| { - let pid = client.server_spec().process_id.unwrap(); - let pgid = client.server_spec().process_group_id; - procutil::setup_signal_handler_once(pid, pgid)?; - Ok(client) - }) - .and_then(|client| client.run_command_chg(handler, env::args_os().skip(1))) - .map(|(_client, _handler, code)| { - procutil::restore_signal_handler_once()?; - Ok(code) - }) - .or_else(|err| Ok(Err(err))) // pass back error to caller - .map(|res| result_tx.send(res).unwrap()); - tokio::run(fut); - result_rx.wait().unwrap_or(Err(io::Error::new( - io::ErrorKind::Other, - "no exit code set", - ))) + let mut handler = ChgUiHandler::new(); + let mut client = loc.connect().await?; + client + .attach_io(&io::stdin(), &io::stdout(), &io::stderr()) + .await?; + client.set_umask(umask).await?; + let pid = client.server_spec().process_id.unwrap(); + let pgid = client.server_spec().process_group_id; + procutil::setup_signal_handler_once(pid, pgid)?; + let code = client + .run_command_chg(&mut handler, env::args_os().skip(1)) + .await?; + procutil::restore_signal_handler_once()?; + handler.wait_pager().await?; + Ok(code) }
--- a/rust/chg/src/runcommand.rs Thu Apr 23 09:59:38 2020 +0200 +++ b/rust/chg/src/runcommand.rs Fri Apr 24 15:06:42 2020 -0400 @@ -6,164 +6,56 @@ //! Functions to run Mercurial command in cHg-aware command server. use bytes::Bytes; -use futures::future::IntoFuture; -use futures::{Async, Future, Poll}; use std::io; -use std::mem; use std::os::unix::io::AsRawFd; use tokio_hglib::codec::ChannelMessage; -use tokio_hglib::protocol::MessageLoop; -use tokio_hglib::{Client, Connection}; +use tokio_hglib::{Connection, Protocol}; -use crate::attachio::AttachIo; +use crate::attachio; use crate::message::{self, CommandType}; use crate::uihandler::SystemHandler; -enum AsyncS<R, S> { - Ready(R), - NotReady(S), - PollAgain(S), -} - -enum CommandState<C, H> -where - C: Connection, - H: SystemHandler, -{ - Running(MessageLoop<C>, H), - SpawningPager(Client<C>, <H::SpawnPagerResult as IntoFuture>::Future), - AttachingPager(AttachIo<C, io::Stdin, H::PagerStdin, H::PagerStdin>, H), - WaitingSystem(Client<C>, <H::RunSystemResult as IntoFuture>::Future), - Finished, -} - -type CommandPoll<C, H> = io::Result<AsyncS<(Client<C>, H, i32), CommandState<C, H>>>; - -/// Future resolves to `(exit_code, client)`. -#[must_use = "futures do nothing unless polled"] -pub struct ChgRunCommand<C, H> -where - C: Connection, - H: SystemHandler, -{ - state: CommandState<C, H>, -} - -impl<C, H> ChgRunCommand<C, H> -where - C: Connection + AsRawFd, - H: SystemHandler, -{ - pub fn with_client(client: Client<C>, handler: H, packed_args: Bytes) -> ChgRunCommand<C, H> { - let msg_loop = MessageLoop::start_with_args(client, b"runcommand", packed_args); - ChgRunCommand { - state: CommandState::Running(msg_loop, handler), - } - } -} - -impl<C, H> Future for ChgRunCommand<C, H> -where - C: Connection + AsRawFd, - H: SystemHandler, -{ - type Item = (Client<C>, H, i32); - type Error = io::Error; - - fn poll(&mut self) -> Poll<Self::Item, Self::Error> { - loop { - let state = mem::replace(&mut self.state, CommandState::Finished); - match state.poll()? { - AsyncS::Ready((client, handler, code)) => { - return Ok(Async::Ready((client, handler, code))); - } - AsyncS::NotReady(newstate) => { - self.state = newstate; - return Ok(Async::NotReady); - } - AsyncS::PollAgain(newstate) => { - self.state = newstate; - } - } - } - } -} - -impl<C, H> CommandState<C, H> -where - C: Connection + AsRawFd, - H: SystemHandler, -{ - fn poll(self) -> CommandPoll<C, H> { - match self { - CommandState::Running(mut msg_loop, handler) => { - if let Async::Ready((client, msg)) = msg_loop.poll()? { - process_message(client, handler, msg) - } else { - Ok(AsyncS::NotReady(CommandState::Running(msg_loop, handler))) - } - } - CommandState::SpawningPager(client, mut fut) => { - if let Async::Ready((handler, pin)) = fut.poll()? { - let fut = AttachIo::with_client(client, io::stdin(), pin, None); - Ok(AsyncS::PollAgain(CommandState::AttachingPager( - fut, handler, - ))) - } else { - Ok(AsyncS::NotReady(CommandState::SpawningPager(client, fut))) - } - } - CommandState::AttachingPager(mut fut, handler) => { - if let Async::Ready(client) = fut.poll()? { - let msg_loop = MessageLoop::start(client, b""); // terminator - Ok(AsyncS::PollAgain(CommandState::Running(msg_loop, handler))) - } else { - Ok(AsyncS::NotReady(CommandState::AttachingPager(fut, handler))) - } - } - CommandState::WaitingSystem(client, mut fut) => { - if let Async::Ready((handler, code)) = fut.poll()? { - let data = message::pack_result_code(code); - let msg_loop = MessageLoop::resume_with_data(client, data); - Ok(AsyncS::PollAgain(CommandState::Running(msg_loop, handler))) - } else { - Ok(AsyncS::NotReady(CommandState::WaitingSystem(client, fut))) - } - } - CommandState::Finished => panic!("poll ChgRunCommand after it's done"), - } - } -} - -fn process_message<C, H>(client: Client<C>, handler: H, msg: ChannelMessage) -> CommandPoll<C, H> -where - C: Connection, - H: SystemHandler, -{ - { - match msg { +/// Runs the given Mercurial command in cHg-aware command server, and +/// fetches the result code. +/// +/// This is a subset of tokio-hglib's `run_command()` with the additional +/// SystemRequest support. +pub async fn run_command( + proto: &mut Protocol<impl Connection + AsRawFd>, + handler: &mut impl SystemHandler, + packed_args: impl Into<Bytes>, +) -> io::Result<i32> { + proto + .send_command_with_args("runcommand", packed_args) + .await?; + loop { + match proto.fetch_response().await? { ChannelMessage::Data(b'r', data) => { - let code = message::parse_result_code(data)?; - Ok(AsyncS::Ready((client, handler, code))) + return message::parse_result_code(data); } ChannelMessage::Data(..) => { // just ignores data sent to optional channel - let msg_loop = MessageLoop::resume(client); - Ok(AsyncS::PollAgain(CommandState::Running(msg_loop, handler))) } - ChannelMessage::InputRequest(..) | ChannelMessage::LineRequest(..) => Err( - io::Error::new(io::ErrorKind::InvalidData, "unsupported request"), - ), + ChannelMessage::InputRequest(..) | ChannelMessage::LineRequest(..) => { + return Err(io::Error::new( + io::ErrorKind::InvalidData, + "unsupported request", + )); + } ChannelMessage::SystemRequest(data) => { let (cmd_type, cmd_spec) = message::parse_command_spec(data)?; match cmd_type { CommandType::Pager => { - let fut = handler.spawn_pager(cmd_spec).into_future(); - Ok(AsyncS::PollAgain(CommandState::SpawningPager(client, fut))) + // server spins new command loop while pager request is + // in progress, which can be terminated by "" command. + let pin = handler.spawn_pager(&cmd_spec).await?; + attachio::attach_io(proto, &io::stdin(), &pin, &pin).await?; + proto.send_command("").await?; // terminator } CommandType::System => { - let fut = handler.run_system(cmd_spec).into_future(); - Ok(AsyncS::PollAgain(CommandState::WaitingSystem(client, fut))) + let code = handler.run_system(&cmd_spec).await?; + let data = message::pack_result_code(code); + proto.send_data(data).await?; } } }
--- a/rust/chg/src/uihandler.rs Thu Apr 23 09:59:38 2020 +0200 +++ b/rust/chg/src/uihandler.rs Fri Apr 24 15:06:42 2020 -0400 @@ -3,76 +3,75 @@ // This software may be used and distributed according to the terms of the // GNU General Public License version 2 or any later version. -use futures::future::IntoFuture; -use futures::Future; +use async_trait::async_trait; use std::io; use std::os::unix::io::AsRawFd; use std::os::unix::process::ExitStatusExt; -use std::process::{Command, Stdio}; +use std::process::Stdio; use tokio; -use tokio_process::{ChildStdin, CommandExt}; +use tokio::process::{Child, ChildStdin, Command}; use crate::message::CommandSpec; use crate::procutil; /// Callback to process shell command requests received from server. -pub trait SystemHandler: Sized { +#[async_trait] +pub trait SystemHandler { type PagerStdin: AsRawFd; - type SpawnPagerResult: IntoFuture<Item = (Self, Self::PagerStdin), Error = io::Error>; - type RunSystemResult: IntoFuture<Item = (Self, i32), Error = io::Error>; /// Handles pager command request. /// /// Returns the pipe to be attached to the server if the pager is spawned. - fn spawn_pager(self, spec: CommandSpec) -> Self::SpawnPagerResult; + async fn spawn_pager(&mut self, spec: &CommandSpec) -> io::Result<Self::PagerStdin>; /// Handles system command request. /// /// Returns command exit code (positive) or signal number (negative). - fn run_system(self, spec: CommandSpec) -> Self::RunSystemResult; + async fn run_system(&mut self, spec: &CommandSpec) -> io::Result<i32>; } /// Default cHg implementation to process requests received from server. -pub struct ChgUiHandler {} +pub struct ChgUiHandler { + pager: Option<Child>, +} impl ChgUiHandler { pub fn new() -> ChgUiHandler { - ChgUiHandler {} + ChgUiHandler { pager: None } + } + + /// Waits until the pager process exits. + pub async fn wait_pager(&mut self) -> io::Result<()> { + if let Some(p) = self.pager.take() { + p.await?; + } + Ok(()) } } +#[async_trait] impl SystemHandler for ChgUiHandler { type PagerStdin = ChildStdin; - type SpawnPagerResult = io::Result<(Self, Self::PagerStdin)>; - type RunSystemResult = Box<dyn Future<Item = (Self, i32), Error = io::Error> + Send>; - fn spawn_pager(self, spec: CommandSpec) -> Self::SpawnPagerResult { - let mut pager = new_shell_command(&spec) - .stdin(Stdio::piped()) - .spawn_async()?; - let pin = pager.stdin().take().unwrap(); + async fn spawn_pager(&mut self, spec: &CommandSpec) -> io::Result<Self::PagerStdin> { + let mut pager = new_shell_command(&spec).stdin(Stdio::piped()).spawn()?; + let pin = pager.stdin.take().unwrap(); procutil::set_blocking_fd(pin.as_raw_fd())?; // TODO: if pager exits, notify the server with SIGPIPE immediately. // otherwise the server won't get SIGPIPE if it does not write // anything. (issue5278) // kill(peerpid, SIGPIPE); - tokio::spawn(pager.map(|_| ()).map_err(|_| ())); // just ignore errors - Ok((self, pin)) + self.pager = Some(pager); + Ok(pin) } - fn run_system(self, spec: CommandSpec) -> Self::RunSystemResult { - let fut = new_shell_command(&spec) - .spawn_async() - .into_future() - .flatten() - .map(|status| { - let code = status - .code() - .or_else(|| status.signal().map(|n| -n)) - .expect("either exit code or signal should be set"); - (self, code) - }); - Box::new(fut) + async fn run_system(&mut self, spec: &CommandSpec) -> io::Result<i32> { + let status = new_shell_command(&spec).spawn()?.await?; + let code = status + .code() + .or_else(|| status.signal().map(|n| -n)) + .expect("either exit code or signal should be set"); + Ok(code) } }
--- a/tests/test-check-rust-format.t Thu Apr 23 09:59:38 2020 +0200 +++ b/tests/test-check-rust-format.t Fri Apr 24 15:06:42 2020 -0400 @@ -5,5 +5,5 @@ $ cd "$TESTDIR"/.. $ RUSTFMT=$(rustup which --toolchain nightly rustfmt) $ for f in `testrepohg files 'glob:**/*.rs'` ; do - > $RUSTFMT --check --unstable-features --color=never $f + > $RUSTFMT --check --edition=2018 --unstable-features --color=never $f > done
--- a/tests/test-histedit-edit.t Thu Apr 23 09:59:38 2020 +0200 +++ b/tests/test-histedit-edit.t Fri Apr 24 15:06:42 2020 -0400 @@ -373,6 +373,7 @@ transaction abort! rollback completed note: commit message saved in .hg/last-message.txt + note: use 'hg commit --logfile .hg/last-message.txt --edit' to reuse it abort: pretxncommit.unexpectedabort hook exited with status 1 [255] $ cat .hg/last-message.txt @@ -397,6 +398,7 @@ transaction abort! rollback completed note: commit message saved in .hg/last-message.txt + note: use 'hg commit --logfile .hg/last-message.txt --edit' to reuse it abort: pretxncommit.unexpectedabort hook exited with status 1 [255]
--- a/tests/test-mq-qfold.t Thu Apr 23 09:59:38 2020 +0200 +++ b/tests/test-mq-qfold.t Fri Apr 24 15:06:42 2020 -0400 @@ -230,6 +230,7 @@ HG: changed a ==== note: commit message saved in .hg/last-message.txt + note: use 'hg commit --logfile .hg/last-message.txt --edit' to reuse it transaction abort! rollback completed qrefresh interrupted while patch was popped! (revert --all, qpush to recover)
--- a/tests/test-mq-qnew.t Thu Apr 23 09:59:38 2020 +0200 +++ b/tests/test-mq-qnew.t Fri Apr 24 15:06:42 2020 -0400 @@ -308,6 +308,7 @@ transaction abort! rollback completed note: commit message saved in .hg/last-message.txt + note: use 'hg commit --logfile .hg/last-message.txt --edit' to reuse it abort: pretxncommit.unexpectedabort hook exited with status 1 [255] $ cat .hg/last-message.txt
--- a/tests/test-mq-qrefresh-replace-log-message.t Thu Apr 23 09:59:38 2020 +0200 +++ b/tests/test-mq-qrefresh-replace-log-message.t Fri Apr 24 15:06:42 2020 -0400 @@ -186,6 +186,7 @@ HG: added file2 ==== note: commit message saved in .hg/last-message.txt + note: use 'hg commit --logfile .hg/last-message.txt --edit' to reuse it transaction abort! rollback completed qrefresh interrupted while patch was popped! (revert --all, qpush to recover) @@ -229,6 +230,7 @@ A file2 ==== note: commit message saved in .hg/last-message.txt + note: use 'hg commit --logfile .hg/last-message.txt --edit' to reuse it transaction abort! rollback completed qrefresh interrupted while patch was popped! (revert --all, qpush to recover)
--- a/tests/test-rollback.t Thu Apr 23 09:59:38 2020 +0200 +++ b/tests/test-rollback.t Fri Apr 24 15:06:42 2020 -0400 @@ -116,6 +116,7 @@ transaction abort! rollback completed note: commit message saved in .hg/last-message.txt + note: use 'hg commit --logfile .hg/last-message.txt --edit' to reuse it abort: pretxncommit hook exited with status * (glob) [255] $ cat .hg/last-message.txt
--- a/tests/test-tag.t Thu Apr 23 09:59:38 2020 +0200 +++ b/tests/test-tag.t Fri Apr 24 15:06:42 2020 -0400 @@ -323,6 +323,7 @@ transaction abort! rollback completed note: commit message saved in .hg/last-message.txt + note: use 'hg commit --logfile .hg/last-message.txt --edit' to reuse it abort: pretxncommit.unexpectedabort hook exited with status 1 [255] $ cat .hg/last-message.txt