1 files changed, 224 insertions, 0 deletions
diff --git a/cli/upgrade.rs b/cli/upgrade.rs
new file mode 100644
index 000000000..519f8d6bc
--- /dev/null
+++ b/cli/upgrade.rs
@@ -0,0 +1,224 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+
+//! This module provides feature to upgrade deno executable
+//!
+//! At the moment it is only consumed using CLI but in
+//! the future it can be easily extended to provide
+//! the same functions as ops available in JS runtime.
+
+extern crate semver_parser;
+use crate::futures::FutureExt;
+use crate::http_util::fetch_once;
+use crate::http_util::FetchOnceResult;
+use crate::op_error::OpError;
+use crate::ErrBox;
+use regex::Regex;
+use reqwest::{redirect::Policy, Client};
+use semver_parser::version::parse as semver_parse;
+use semver_parser::version::Version;
+use std::fs;
+use std::future::Future;
+use std::io::prelude::*;
+use std::path::Path;
+use std::path::PathBuf;
+use std::pin::Pin;
+use std::process::Command;
+use std::process::Stdio;
+use std::string::String;
+use tempfile::TempDir;
+use url::Url;
+
+// TODO(ry) Auto detect target triples for the uploaded files.
+#[cfg(windows)]
+const ARCHIVE_NAME: &str = "deno-x86_64-pc-windows-msvc.zip";
+#[cfg(target_os = "macos")]
+const ARCHIVE_NAME: &str = "deno-x86_64-apple-darwin.zip";
+#[cfg(target_os = "linux")]
+const ARCHIVE_NAME: &str = "deno-x86_64-unknown-linux-gnu.zip";
+
+async fn get_latest_version(client: &Client) -> Result<Version, ErrBox> {
+  println!("Checking for latest version");
+  let body = client
+    .get(Url::parse(
+      "https://github.com/denoland/deno/releases/latest",
+    )?)
+    .send()
+    .await?
+    .text()
+    .await?;
+  let v = find_version(&body)?;
+  Ok(semver_parse(&v).unwrap())
+}
+
+/// Asynchronously updates deno executable to greatest version
+/// if greatest version is available.
+pub async fn upgrade_command(dry_run: bool, force: bool) -> Result<(), ErrBox> {
+  let client = Client::builder().redirect(Policy::none()).build()?;
+  let latest_version = get_latest_version(&client).await?;
+  let current_version = semver_parse(crate::version::DENO).unwrap();
+
+  if !force && current_version >= latest_version {
+    println!(
+      "Local deno version {} is the most recent release",
+      &crate::version::DENO
+    );
+  } else {
+    println!(
+      "New version has been found\nDeno is upgrading to version {}",
+      &latest_version
+    );
+    let archive_data =
+      download_package(&compose_url_to_exec(&latest_version)?, client).await?;
+
+    let old_exe_path = std::env::current_exe()?;
+    let new_exe_path = unpack(archive_data)?;
+    let permissions = fs::metadata(&old_exe_path)?.permissions();
+    fs::set_permissions(&new_exe_path, permissions)?;
+    check_exe(&new_exe_path, &latest_version)?;
+
+    if !dry_run {
+      replace_exe(&new_exe_path, &old_exe_path)?;
+    }
+
+    println!("Upgrade done successfully")
+  }
+  Ok(())
+}
+
+fn download_package(
+  url: &Url,
+  client: Client,
+) -> Pin<Box<dyn Future<Output = Result<Vec<u8>, ErrBox>>>> {
+  println!("downloading {}", url);
+  let url = url.clone();
+  let fut = async move {
+    match fetch_once(client.clone(), &url, None).await? {
+      FetchOnceResult::Code(source, _) => Ok(source),
+      FetchOnceResult::NotModified => unreachable!(),
+      FetchOnceResult::Redirect(_url, _) => {
+        download_package(&_url, client).await
+      }
+    }
+  };
+  fut.boxed_local()
+}
+
+fn compose_url_to_exec(version: &Version) -> Result<Url, ErrBox> {
+  let s = format!(
+    "https://github.com/denoland/deno/releases/download/v{}/{}",
+    version, ARCHIVE_NAME
+  );
+  Ok(Url::parse(&s)?)
+}
+
+fn find_version(text: &str) -> Result<String, ErrBox> {
+  let re = Regex::new(r#"v([^\?]+)?""#)?;
+  if let Some(_mat) = re.find(text) {
+    let mat = _mat.as_str();
+    return Ok(mat[1..mat.len() - 1].to_string());
+  }
+  Err(OpError::other("Cannot read latest tag version".to_string()).into())
+}
+
+fn unpack(archive_data: Vec<u8>) -> Result<PathBuf, ErrBox> {
+  // We use into_path so that the tempdir is not automatically deleted. This is
+  // useful for debugging upgrade, but also so this function can return a path
+  // to the newly uncompressed file without fear of the tempdir being deleted.
+  let temp_dir = TempDir::new()?.into_path();
+  let exe_ext = if cfg!(windows) { "exe" } else { "" };
+  let exe_path = temp_dir.join("deno").with_extension(exe_ext);
+  assert!(!exe_path.exists());
+
+  let archive_ext = Path::new(ARCHIVE_NAME)
+    .extension()
+    .and_then(|ext| ext.to_str())
+    .unwrap();
+  let unpack_status = match archive_ext {
+    "gz" => {
+      let exe_file = fs::File::create(&exe_path)?;
+      let mut cmd = Command::new("gunzip")
+        .arg("-c")
+        .stdin(Stdio::piped())
+        .stdout(Stdio::from(exe_file))
+        .spawn()?;
+      cmd.stdin.as_mut().unwrap().write_all(&archive_data)?;
+      cmd.wait()?
+    }
+    "zip" => {
+      if cfg!(windows) {
+        let archive_path = temp_dir.join("deno.zip");
+        fs::write(&archive_path, &archive_data)?;
+        Command::new("powershell.exe")
+          .arg("-Command")
+          .arg("Expand-Archive")
+          .arg("-Path")
+          .arg(&archive_path)
+          .arg("-DestinationPath")
+          .arg(&temp_dir)
+          .spawn()?
+          .wait()?
+      } else {
+        let archive_path = temp_dir.join("deno.zip");
+        fs::write(&archive_path, &archive_data)?;
+        Command::new("unzip")
+          .current_dir(&temp_dir)
+          .arg(archive_path)
+          .spawn()?
+          .wait()?
+      }
+    }
+    ext => panic!("Unsupported archive type: '{}'", ext),
+  };
+  assert!(unpack_status.success());
+  assert!(exe_path.exists());
+  Ok(exe_path)
+}
+
+fn replace_exe(new: &Path, old: &Path) -> Result<(), ErrBox> {
+  if cfg!(windows) {
+    // On windows you cannot replace the currently running executable.
+    // so first we rename it to deno.old.exe
+    fs::rename(old, old.with_extension("old.exe"))?;
+  } else {
+    fs::remove_file(old)?;
+  }
+  // Windows cannot rename files across device boundaries, so if rename fails,
+  // we try again with copy.
+  fs::rename(new, old).or_else(|_| fs::copy(new, old).map(|_| ()))?;
+  Ok(())
+}
+
+fn check_exe(
+  exe_path: &Path,
+  expected_version: &Version,
+) -> Result<(), ErrBox> {
+  let output = Command::new(exe_path)
+    .arg("-V")
+    .stderr(std::process::Stdio::inherit())
+    .output()?;
+  let stdout = String::from_utf8(output.stdout)?;
+  assert!(output.status.success());
+  assert_eq!(stdout.trim(), format!("deno {}", expected_version));
+  Ok(())
+}
+
+#[test]
+fn test_find_version() {
+  let url = "<html><body>You are being <a href=\"https://github.com/denoland/deno/releases/tag/v0.36.0\">redirected</a>.</body></html>";
+  assert_eq!(find_version(url).unwrap(), "0.36.0".to_string());
+}
+
+#[test]
+fn test_compose_url_to_exec() {
+  let v = semver_parse("0.0.1").unwrap();
+  let url = compose_url_to_exec(&v).unwrap();
+  #[cfg(windows)]
+  assert_eq!(url.as_str(), "https://github.com/denoland/deno/releases/download/v0.0.1/deno-x86_64-pc-windows-msvc.zip");
+  #[cfg(target_os = "macos")]
+  assert_eq!(
+    url.as_str(),
+    "https://github.com/denoland/deno/releases/download/v0.0.1/deno-x86_64-apple-darwin.zip"
+  );
+  #[cfg(target_os = "linux")]
+  assert_eq!(url.as_str(), "https://github.com/denoland/deno/releases/download/v0.0.1/deno-x86_64-unknown-linux-gnu.zip");
+}