Simplifying the locks

Dependencies

• [2] W5NU4F6J Less noisy lock
• [3] 64M73LNC Hide `pijul lock` and avoid panics when used improperly
• [4] GYXIF25T Proper parsing of URLs
• [5] 2K7JLB4Z No pager on Windows
• [6] JL4WKA5P Implement the Sanakirja concurrency model in a cross-process way
• [7] LYTVEPH3 Avoid cloning into an existing path
• [*] SXEYMYF7 Fixing the bad changes in history (unfortunately, by rebooting).

Change contents

• replacement in pijul/src/repository/unix_lock.rs at line 20
  [4.2286]→[4.2286:2597](∅→∅)
  − pub async fn mut_txn<P: AsRef<Path>>(file: P) -> Result<MutTxnLock, anyhow::Error> {

  − let cmd = std::env::args().next().unwrap();

  − let mut process = std::process::Command::new(&cmd)

  − .args(&["lock", file.as_ref().to_str().unwrap()])

  − .stdout(std::process::Stdio::piped())

  − .spawn()?;
  [4.2286]

  [4.2597]
  + async fn start_stream_if_needed(file: &Path) -> Result<UnixStream, std::io::Error> {

  + if let Ok(stream) = UnixStream::connect(file).await {

  + Ok(stream)

  + } else {

  + let cmd = std::env::args().next().unwrap();

  + let mut process = std::process::Command::new(&cmd)

  + .args(&["lock", file.to_str().unwrap()])

  + .stdout(std::process::Stdio::piped())

  + .spawn()?;

  + let s = process.stdout.as_mut().unwrap();

  + s.read(&mut [0u8])?;

  + UnixStream::connect(file).await

  + }

  + }
• replacement in pijul/src/repository/unix_lock.rs at line 35
  [4.2598]→[4.2598:2724](∅→∅)
  − let s = process.stdout.as_mut().unwrap();

  − s.read(&mut [0u8])?;

  − let mut stream = UnixStream::connect(file).await?;
  [4.2598]

  [4.2724]
  + pub async fn mut_txn<P: AsRef<Path>>(file: P) -> Result<MutTxnLock, anyhow::Error> {

  + let mut stream = start_stream_if_needed(file.as_ref()).await?;
• replacement in pijul/src/repository/unix_lock.rs at line 49
  [4.3050]→[4.3050:3267](∅→∅)
  − let cmd = std::env::args().next().unwrap();

  − std::process::Command::new(&cmd)

  − .args(&["lock", file.as_ref().to_str().unwrap()])

  − .spawn()?;

  − let mut stream = UnixStream::connect(file).await?;
  [4.3050]

  [4.3267]
  + let mut stream = start_stream_if_needed(file.as_ref()).await?;

  + stream.writable().await?;
• edit in pijul/src/commands/lock.rs at line 1
  [4.7180]→[4.7181:7225](∅→∅)
  − use fs2::FileExt;

  − use std::fs::OpenOptions;
• replacement in pijul/src/commands/lock.rs at line 20
  [4.7613]→[4.7613:7676](∅→∅),[4.7676]→[2.0:58](∅→∅),[2.58]→[4.7676:7769](∅→∅),[4.7676]→[4.7676:7769](∅→∅),[4.7769]→[3.44:80](∅→∅),[3.80]→[4.7826:7905](∅→∅),[4.7826]→[4.7826:7905](∅→∅)
  − let lock = Arc::new(self.path.with_extension("lock"));

  − std::fs::create_dir_all(lock.parent().unwrap())?;

  − let lockfile = OpenOptions::new()

  − .write(true)

  − .create(true)

  − .open(&lock.as_ref())?;

  − if lockfile.try_lock_exclusive().is_err() {

  − return Ok(());
  [4.7613]

  [4.7905]
  + if let Some(p) = self.path.parent() {

  + std::fs::create_dir_all(p)?
• replacement in pijul/src/commands/lock.rs at line 23
  [4.7915]→[3.81:137](∅→∅)
  − let listener = UnixListener::bind(&self.path)?;
  [4.7915]

  [4.7979]
  + let listener = UnixListener::bind(&self.path);
• edit in pijul/src/commands/lock.rs at line 25
  [4.7999]

  [4.7999]
  + let listener = if let Ok(listener) = listener {

  + listener

  + } else {

  + return Ok(());

  + };
• edit in pijul/src/commands/lock.rs at line 38
  [4.8358]→[4.8358:8419](∅→∅)
  − let last_commit_date = Arc::new(Mutex::new(0usize));
• edit in pijul/src/commands/lock.rs at line 47
  [4.9496]→[4.9496:9565](∅→∅)
  − let last_commit_date = last_commit_date.clone();
• edit in pijul/src/commands/lock.rs at line 50
  [4.9720]→[4.9720:9765](∅→∅)
  − let lock = lock.clone();
• edit in pijul/src/commands/lock.rs at line 77
  [4.11259]→[4.11259:11340](∅→∅)
  − *last_commit_date.lock().await = *clock;
• replacement in pijul/src/commands/lock.rs at line 92
  [4.12167]→[4.12167:12248](∅→∅)
  − if start_date < *last_commit_date.lock().await {
  [4.12167]

  [4.12248]
  + if start_date < *clock.lock().await {
• edit in pijul/src/commands/lock.rs at line 102
  [4.13197]→[3.138:211](∅→∅),[3.211]→[4.13263:13362](∅→∅),[4.13263]→[4.13263:13362](∅→∅),[4.13362]→[4.13362:13419](∅→∅),[4.13419]→[3.212:349](∅→∅)
  − if let Ok(lockfile) = OpenOptions::new()

  − .write(true)

  − .create(true)

  − .open(lock.as_ref())

  − {

  − lockfile.unlock().unwrap_or(());

  − }
• edit in pijul/src/commands/lock.rs at line 112
  [4.13852]→[4.13852:13945](∅→∅),[4.13945]→[3.350:385](∅→∅),[3.385]→[4.14001:14042](∅→∅),[4.14001]→[4.14001:14042](∅→∅)
  − let lockfile = OpenOptions::new()

  − .write(true)

  − .create(true)

  − .open(lock.as_ref())?;

  − lockfile.unlock().unwrap_or(());
• edit in pijul/Cargo.toml at line 87
  [4.2300]→[4.16945:16957](∅→∅)
  − fs2 = "0.4"