mirror of
https://github.com/denoland/deno.git
synced 2024-11-24 15:19:26 -05:00
a68eb3fcc3
This introduces the `denort` binary - a slim version of deno without tooling. The binary is used as the default for `deno compile`. Improves `deno compile` final size by ~2.5x (141 MB -> 61 MB) on Linux x86_64.
730 lines
22 KiB
Rust
730 lines
22 KiB
Rust
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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use std::collections::BTreeMap;
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use std::env::current_exe;
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use std::fs;
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use std::io::Read;
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use std::io::Seek;
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use std::io::SeekFrom;
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use std::io::Write;
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use std::path::Path;
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use std::path::PathBuf;
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use std::process::Command;
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use deno_ast::ModuleSpecifier;
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use deno_core::anyhow::bail;
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use deno_core::anyhow::Context;
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use deno_core::error::AnyError;
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use deno_core::futures::io::AllowStdIo;
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use deno_core::futures::AsyncReadExt;
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use deno_core::futures::AsyncSeekExt;
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use deno_core::serde_json;
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use deno_core::url::Url;
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use deno_npm::NpmSystemInfo;
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use deno_runtime::permissions::PermissionsOptions;
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use deno_semver::package::PackageReq;
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use deno_semver::VersionReqSpecifierParseError;
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use log::Level;
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use serde::Deserialize;
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use serde::Serialize;
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use crate::args::package_json::PackageJsonDepValueParseError;
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use crate::args::package_json::PackageJsonDeps;
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use crate::args::CaData;
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use crate::args::CliOptions;
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use crate::args::CompileFlags;
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use crate::args::PackageJsonDepsProvider;
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use crate::args::UnstableConfig;
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use crate::cache::DenoDir;
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use crate::file_fetcher::FileFetcher;
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use crate::http_util::HttpClient;
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use crate::npm::CliNpmResolver;
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use crate::npm::InnerCliNpmResolverRef;
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use crate::util::progress_bar::ProgressBar;
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use crate::util::progress_bar::ProgressBarStyle;
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use super::virtual_fs::FileBackedVfs;
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use super::virtual_fs::VfsBuilder;
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use super::virtual_fs::VfsRoot;
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use super::virtual_fs::VirtualDirectory;
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const MAGIC_TRAILER: &[u8; 8] = b"d3n0l4nd";
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#[derive(Serialize, Deserialize)]
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enum SerializablePackageJsonDepValueParseError {
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Specifier(String),
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Unsupported { scheme: String },
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}
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impl SerializablePackageJsonDepValueParseError {
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pub fn from_err(err: PackageJsonDepValueParseError) -> Self {
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match err {
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PackageJsonDepValueParseError::Specifier(err) => {
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Self::Specifier(err.source.to_string())
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}
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PackageJsonDepValueParseError::Unsupported { scheme } => {
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Self::Unsupported { scheme }
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}
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}
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}
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pub fn into_err(self) -> PackageJsonDepValueParseError {
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match self {
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SerializablePackageJsonDepValueParseError::Specifier(source) => {
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PackageJsonDepValueParseError::Specifier(
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VersionReqSpecifierParseError {
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source: monch::ParseErrorFailureError::new(source),
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},
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)
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}
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SerializablePackageJsonDepValueParseError::Unsupported { scheme } => {
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PackageJsonDepValueParseError::Unsupported { scheme }
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}
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}
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}
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}
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#[derive(Serialize, Deserialize)]
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pub struct SerializablePackageJsonDeps(
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BTreeMap<
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String,
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Result<PackageReq, SerializablePackageJsonDepValueParseError>,
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>,
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);
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impl SerializablePackageJsonDeps {
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pub fn from_deps(deps: PackageJsonDeps) -> Self {
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Self(
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deps
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.into_iter()
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.map(|(name, req)| {
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let res =
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req.map_err(SerializablePackageJsonDepValueParseError::from_err);
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(name, res)
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})
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.collect(),
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)
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}
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pub fn into_deps(self) -> PackageJsonDeps {
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self
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.0
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.into_iter()
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.map(|(name, res)| (name, res.map_err(|err| err.into_err())))
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.collect()
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}
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}
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#[derive(Deserialize, Serialize)]
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pub enum NodeModules {
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Managed {
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/// Whether this uses a node_modules directory (true) or the global cache (false).
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node_modules_dir: bool,
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package_json_deps: Option<SerializablePackageJsonDeps>,
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},
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Byonm {
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package_json_deps: Option<SerializablePackageJsonDeps>,
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},
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}
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#[derive(Deserialize, Serialize)]
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pub struct Metadata {
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pub argv: Vec<String>,
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pub seed: Option<u64>,
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pub permissions: PermissionsOptions,
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pub location: Option<Url>,
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pub v8_flags: Vec<String>,
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pub log_level: Option<Level>,
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pub ca_stores: Option<Vec<String>>,
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pub ca_data: Option<Vec<u8>>,
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pub unsafely_ignore_certificate_errors: Option<Vec<String>>,
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pub maybe_import_map: Option<(Url, String)>,
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pub entrypoint: ModuleSpecifier,
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pub node_modules: Option<NodeModules>,
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pub disable_deprecated_api_warning: bool,
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pub unstable_config: UnstableConfig,
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}
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pub fn load_npm_vfs(root_dir_path: PathBuf) -> Result<FileBackedVfs, AnyError> {
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let file_path = current_exe().unwrap();
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let mut file = std::fs::File::open(file_path)?;
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file.seek(SeekFrom::End(-(TRAILER_SIZE as i64)))?;
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let mut trailer = [0; TRAILER_SIZE];
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file.read_exact(&mut trailer)?;
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let trailer = Trailer::parse(&trailer)?.unwrap();
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file.seek(SeekFrom::Start(trailer.npm_vfs_pos))?;
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let mut vfs_data = vec![0; trailer.npm_vfs_len() as usize];
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file.read_exact(&mut vfs_data)?;
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let mut dir: VirtualDirectory = serde_json::from_slice(&vfs_data)?;
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// align the name of the directory with the root dir
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dir.name = root_dir_path
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.file_name()
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.unwrap()
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.to_string_lossy()
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.to_string();
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let fs_root = VfsRoot {
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dir,
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root_path: root_dir_path,
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start_file_offset: trailer.npm_files_pos,
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};
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Ok(FileBackedVfs::new(file, fs_root))
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}
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fn write_binary_bytes(
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writer: &mut impl Write,
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original_bin: Vec<u8>,
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metadata: &Metadata,
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eszip: eszip::EszipV2,
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npm_vfs: Option<&VirtualDirectory>,
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npm_files: &Vec<Vec<u8>>,
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) -> Result<(), AnyError> {
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let metadata = serde_json::to_string(metadata)?.as_bytes().to_vec();
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let npm_vfs = serde_json::to_string(&npm_vfs)?.as_bytes().to_vec();
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let eszip_archive = eszip.into_bytes();
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writer.write_all(&original_bin)?;
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writer.write_all(&eszip_archive)?;
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writer.write_all(&metadata)?;
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writer.write_all(&npm_vfs)?;
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for file in npm_files {
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writer.write_all(file)?;
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}
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// write the trailer, which includes the positions
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// of the data blocks in the file
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writer.write_all(&{
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let eszip_pos = original_bin.len() as u64;
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let metadata_pos = eszip_pos + (eszip_archive.len() as u64);
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let npm_vfs_pos = metadata_pos + (metadata.len() as u64);
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let npm_files_pos = npm_vfs_pos + (npm_vfs.len() as u64);
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Trailer {
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eszip_pos,
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metadata_pos,
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npm_vfs_pos,
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npm_files_pos,
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}
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.as_bytes()
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})?;
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Ok(())
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}
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pub fn is_standalone_binary(exe_path: &Path) -> bool {
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let Ok(mut output_file) = std::fs::File::open(exe_path) else {
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return false;
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};
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if output_file
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.seek(SeekFrom::End(-(TRAILER_SIZE as i64)))
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.is_err()
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{
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// This seek may fail because the file is too small to possibly be
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// `deno compile` output.
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return false;
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}
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let mut trailer = [0; TRAILER_SIZE];
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if output_file.read_exact(&mut trailer).is_err() {
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return false;
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};
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let (magic_trailer, _) = trailer.split_at(8);
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magic_trailer == MAGIC_TRAILER
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}
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/// This function will try to run this binary as a standalone binary
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/// produced by `deno compile`. It determines if this is a standalone
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/// binary by skipping over the trailer width at the end of the file,
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/// then checking for the magic trailer string `d3n0l4nd`. If found,
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/// the bundle is executed. If not, this function exits with `Ok(None)`.
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pub async fn extract_standalone(
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exe_path: &Path,
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cli_args: Vec<String>,
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) -> Result<Option<(Metadata, eszip::EszipV2)>, AnyError> {
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let file = std::fs::File::open(exe_path)?;
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let mut bufreader =
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deno_core::futures::io::BufReader::new(AllowStdIo::new(file));
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let _trailer_pos = bufreader
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.seek(SeekFrom::End(-(TRAILER_SIZE as i64)))
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.await?;
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let mut trailer = [0; TRAILER_SIZE];
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bufreader.read_exact(&mut trailer).await?;
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let trailer = match Trailer::parse(&trailer)? {
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None => return Ok(None),
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Some(trailer) => trailer,
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};
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bufreader.seek(SeekFrom::Start(trailer.eszip_pos)).await?;
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let (eszip, loader) = eszip::EszipV2::parse(bufreader)
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.await
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.context("Failed to parse eszip header")?;
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let mut bufreader = loader.await.context("Failed to parse eszip archive")?;
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bufreader
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.seek(SeekFrom::Start(trailer.metadata_pos))
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.await?;
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let mut metadata = String::new();
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bufreader
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.take(trailer.metadata_len())
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.read_to_string(&mut metadata)
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.await
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.context("Failed to read metadata from the current executable")?;
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let mut metadata: Metadata = serde_json::from_str(&metadata).unwrap();
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metadata.argv.append(&mut cli_args[1..].to_vec());
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Ok(Some((metadata, eszip)))
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}
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const TRAILER_SIZE: usize = std::mem::size_of::<Trailer>() + 8; // 8 bytes for the magic trailer string
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struct Trailer {
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eszip_pos: u64,
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metadata_pos: u64,
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npm_vfs_pos: u64,
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npm_files_pos: u64,
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}
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impl Trailer {
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pub fn parse(trailer: &[u8]) -> Result<Option<Trailer>, AnyError> {
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let (magic_trailer, rest) = trailer.split_at(8);
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if magic_trailer != MAGIC_TRAILER {
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return Ok(None);
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}
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let (eszip_archive_pos, rest) = rest.split_at(8);
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let (metadata_pos, rest) = rest.split_at(8);
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let (npm_vfs_pos, npm_files_pos) = rest.split_at(8);
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let eszip_archive_pos = u64_from_bytes(eszip_archive_pos)?;
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let metadata_pos = u64_from_bytes(metadata_pos)?;
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let npm_vfs_pos = u64_from_bytes(npm_vfs_pos)?;
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let npm_files_pos = u64_from_bytes(npm_files_pos)?;
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Ok(Some(Trailer {
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eszip_pos: eszip_archive_pos,
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metadata_pos,
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npm_vfs_pos,
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npm_files_pos,
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}))
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}
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pub fn metadata_len(&self) -> u64 {
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self.npm_vfs_pos - self.metadata_pos
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}
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pub fn npm_vfs_len(&self) -> u64 {
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self.npm_files_pos - self.npm_vfs_pos
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}
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pub fn as_bytes(&self) -> Vec<u8> {
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let mut trailer = MAGIC_TRAILER.to_vec();
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trailer.write_all(&self.eszip_pos.to_be_bytes()).unwrap();
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trailer.write_all(&self.metadata_pos.to_be_bytes()).unwrap();
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trailer.write_all(&self.npm_vfs_pos.to_be_bytes()).unwrap();
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trailer
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.write_all(&self.npm_files_pos.to_be_bytes())
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.unwrap();
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trailer
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}
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}
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fn u64_from_bytes(arr: &[u8]) -> Result<u64, AnyError> {
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let fixed_arr: &[u8; 8] = arr
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.try_into()
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.context("Failed to convert the buffer into a fixed-size array")?;
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Ok(u64::from_be_bytes(*fixed_arr))
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}
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pub fn unpack_into_dir(
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exe_name: &str,
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archive_name: &str,
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archive_data: Vec<u8>,
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is_windows: bool,
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temp_dir: &tempfile::TempDir,
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) -> Result<PathBuf, AnyError> {
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let temp_dir_path = temp_dir.path();
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let exe_ext = if is_windows { "exe" } else { "" };
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let archive_path = temp_dir_path.join(exe_name).with_extension("zip");
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let exe_path = temp_dir_path.join(exe_name).with_extension(exe_ext);
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assert!(!exe_path.exists());
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let archive_ext = Path::new(archive_name)
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.extension()
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.and_then(|ext| ext.to_str())
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.unwrap();
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let unpack_status = match archive_ext {
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"zip" if cfg!(windows) => {
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fs::write(&archive_path, &archive_data)?;
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Command::new("tar.exe")
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.arg("xf")
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.arg(&archive_path)
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.arg("-C")
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.arg(temp_dir_path)
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.spawn()
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.map_err(|err| {
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if err.kind() == std::io::ErrorKind::NotFound {
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std::io::Error::new(
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std::io::ErrorKind::NotFound,
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"`tar.exe` was not found in your PATH",
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)
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} else {
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err
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}
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})?
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.wait()?
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}
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"zip" => {
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fs::write(&archive_path, &archive_data)?;
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Command::new("unzip")
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.current_dir(temp_dir_path)
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.arg(&archive_path)
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.spawn()
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.map_err(|err| {
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if err.kind() == std::io::ErrorKind::NotFound {
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std::io::Error::new(
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std::io::ErrorKind::NotFound,
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"`unzip` was not found in your PATH, please install `unzip`",
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)
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} else {
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err
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}
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})?
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.wait()?
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}
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ext => bail!("Unsupported archive type: '{ext}'"),
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};
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if !unpack_status.success() {
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bail!("Failed to unpack archive.");
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}
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assert!(exe_path.exists());
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fs::remove_file(&archive_path)?;
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Ok(exe_path)
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}
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pub struct DenoCompileBinaryWriter<'a> {
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file_fetcher: &'a FileFetcher,
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client: &'a HttpClient,
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deno_dir: &'a DenoDir,
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npm_resolver: &'a dyn CliNpmResolver,
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npm_system_info: NpmSystemInfo,
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package_json_deps_provider: &'a PackageJsonDepsProvider,
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}
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impl<'a> DenoCompileBinaryWriter<'a> {
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#[allow(clippy::too_many_arguments)]
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pub fn new(
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file_fetcher: &'a FileFetcher,
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client: &'a HttpClient,
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deno_dir: &'a DenoDir,
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npm_resolver: &'a dyn CliNpmResolver,
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npm_system_info: NpmSystemInfo,
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package_json_deps_provider: &'a PackageJsonDepsProvider,
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) -> Self {
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Self {
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file_fetcher,
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client,
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deno_dir,
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npm_resolver,
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npm_system_info,
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package_json_deps_provider,
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}
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}
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pub async fn write_bin(
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&self,
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writer: &mut impl Write,
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eszip: eszip::EszipV2,
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module_specifier: &ModuleSpecifier,
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compile_flags: &CompileFlags,
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cli_options: &CliOptions,
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) -> Result<(), AnyError> {
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// Select base binary based on target
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let mut original_binary = self.get_base_binary(compile_flags).await?;
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if compile_flags.no_terminal {
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let target = compile_flags.resolve_target();
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if !target.contains("windows") {
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bail!(
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"The `--no-terminal` flag is only available when targeting Windows (current: {})",
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target,
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)
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}
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set_windows_binary_to_gui(&mut original_binary)?;
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}
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self
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.write_standalone_binary(
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writer,
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original_binary,
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eszip,
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module_specifier,
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cli_options,
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compile_flags,
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)
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.await
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}
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async fn get_base_binary(
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&self,
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compile_flags: &CompileFlags,
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) -> Result<Vec<u8>, AnyError> {
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// Used for testing.
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//
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// Phase 2 of the 'min sized' deno compile RFC talks
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// about adding this as a flag.
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if let Some(path) = std::env::var_os("DENORT_BIN") {
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return Ok(std::fs::read(path)?);
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}
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let target = compile_flags.resolve_target();
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let binary_name = format!("denort-{target}.zip");
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let binary_path_suffix = if crate::version::is_canary() {
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format!("canary/{}/{}", crate::version::GIT_COMMIT_HASH, binary_name)
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} else {
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format!("release/v{}/{}", env!("CARGO_PKG_VERSION"), binary_name)
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};
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let download_directory = self.deno_dir.dl_folder_path();
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let binary_path = download_directory.join(&binary_path_suffix);
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if !binary_path.exists() {
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self
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|
.download_base_binary(&download_directory, &binary_path_suffix)
|
|
.await?;
|
|
}
|
|
|
|
let archive_data = std::fs::read(binary_path)?;
|
|
let temp_dir = tempfile::TempDir::new()?;
|
|
let base_binary_path = unpack_into_dir(
|
|
"denort",
|
|
&binary_name,
|
|
archive_data,
|
|
target.contains("windows"),
|
|
&temp_dir,
|
|
)?;
|
|
let base_binary = std::fs::read(base_binary_path)?;
|
|
drop(temp_dir); // delete the temp dir
|
|
Ok(base_binary)
|
|
}
|
|
|
|
async fn download_base_binary(
|
|
&self,
|
|
output_directory: &Path,
|
|
binary_path_suffix: &str,
|
|
) -> Result<(), AnyError> {
|
|
let download_url = format!("https://dl.deno.land/{binary_path_suffix}");
|
|
let maybe_bytes = {
|
|
let progress_bars = ProgressBar::new(ProgressBarStyle::DownloadBars);
|
|
let progress = progress_bars.update(&download_url);
|
|
|
|
self
|
|
.client
|
|
.download_with_progress(download_url, &progress)
|
|
.await?
|
|
};
|
|
let bytes = match maybe_bytes {
|
|
Some(bytes) => bytes,
|
|
None => {
|
|
log::info!("Download could not be found, aborting");
|
|
std::process::exit(1)
|
|
}
|
|
};
|
|
|
|
std::fs::create_dir_all(output_directory)?;
|
|
let output_path = output_directory.join(binary_path_suffix);
|
|
std::fs::create_dir_all(output_path.parent().unwrap())?;
|
|
tokio::fs::write(output_path, bytes).await?;
|
|
Ok(())
|
|
}
|
|
|
|
/// This functions creates a standalone deno binary by appending a bundle
|
|
/// and magic trailer to the currently executing binary.
|
|
async fn write_standalone_binary(
|
|
&self,
|
|
writer: &mut impl Write,
|
|
original_bin: Vec<u8>,
|
|
mut eszip: eszip::EszipV2,
|
|
entrypoint: &ModuleSpecifier,
|
|
cli_options: &CliOptions,
|
|
compile_flags: &CompileFlags,
|
|
) -> Result<(), AnyError> {
|
|
let ca_data = match cli_options.ca_data() {
|
|
Some(CaData::File(ca_file)) => Some(
|
|
std::fs::read(ca_file)
|
|
.with_context(|| format!("Reading: {ca_file}"))?,
|
|
),
|
|
Some(CaData::Bytes(bytes)) => Some(bytes.clone()),
|
|
None => None,
|
|
};
|
|
let maybe_import_map = cli_options
|
|
.resolve_import_map(self.file_fetcher)
|
|
.await?
|
|
.map(|import_map| (import_map.base_url().clone(), import_map.to_json()));
|
|
let (npm_vfs, npm_files, node_modules) =
|
|
match self.npm_resolver.as_inner() {
|
|
InnerCliNpmResolverRef::Managed(managed) => {
|
|
let snapshot =
|
|
managed.serialized_valid_snapshot_for_system(&self.npm_system_info);
|
|
if !snapshot.as_serialized().packages.is_empty() {
|
|
let (root_dir, files) = self.build_vfs()?.into_dir_and_files();
|
|
eszip.add_npm_snapshot(snapshot);
|
|
(
|
|
Some(root_dir),
|
|
files,
|
|
Some(NodeModules::Managed {
|
|
node_modules_dir: self
|
|
.npm_resolver
|
|
.root_node_modules_path()
|
|
.is_some(),
|
|
package_json_deps: self.package_json_deps_provider.deps().map(
|
|
|deps| SerializablePackageJsonDeps::from_deps(deps.clone()),
|
|
),
|
|
}),
|
|
)
|
|
} else {
|
|
(None, Vec::new(), None)
|
|
}
|
|
}
|
|
InnerCliNpmResolverRef::Byonm(_) => {
|
|
let (root_dir, files) = self.build_vfs()?.into_dir_and_files();
|
|
(
|
|
Some(root_dir),
|
|
files,
|
|
Some(NodeModules::Byonm {
|
|
package_json_deps: self.package_json_deps_provider.deps().map(
|
|
|deps| SerializablePackageJsonDeps::from_deps(deps.clone()),
|
|
),
|
|
}),
|
|
)
|
|
}
|
|
};
|
|
|
|
let metadata = Metadata {
|
|
argv: compile_flags.args.clone(),
|
|
seed: cli_options.seed(),
|
|
location: cli_options.location_flag().clone(),
|
|
permissions: cli_options.permissions_options(),
|
|
v8_flags: cli_options.v8_flags().clone(),
|
|
unsafely_ignore_certificate_errors: cli_options
|
|
.unsafely_ignore_certificate_errors()
|
|
.clone(),
|
|
log_level: cli_options.log_level(),
|
|
ca_stores: cli_options.ca_stores().clone(),
|
|
ca_data,
|
|
entrypoint: entrypoint.clone(),
|
|
maybe_import_map,
|
|
node_modules,
|
|
disable_deprecated_api_warning: cli_options
|
|
.disable_deprecated_api_warning,
|
|
unstable_config: UnstableConfig {
|
|
legacy_flag_enabled: cli_options.legacy_unstable_flag(),
|
|
bare_node_builtins: cli_options.unstable_bare_node_builtins(),
|
|
byonm: cli_options.unstable_byonm(),
|
|
sloppy_imports: cli_options.unstable_sloppy_imports(),
|
|
features: cli_options.unstable_features(),
|
|
},
|
|
};
|
|
|
|
write_binary_bytes(
|
|
writer,
|
|
original_bin,
|
|
&metadata,
|
|
eszip,
|
|
npm_vfs.as_ref(),
|
|
&npm_files,
|
|
)
|
|
}
|
|
|
|
fn build_vfs(&self) -> Result<VfsBuilder, AnyError> {
|
|
fn maybe_warn_different_system(system_info: &NpmSystemInfo) {
|
|
if system_info != &NpmSystemInfo::default() {
|
|
log::warn!("{} The node_modules directory may be incompatible with the target system.", crate::colors::yellow("Warning"));
|
|
}
|
|
}
|
|
|
|
match self.npm_resolver.as_inner() {
|
|
InnerCliNpmResolverRef::Managed(npm_resolver) => {
|
|
if let Some(node_modules_path) = npm_resolver.root_node_modules_path() {
|
|
maybe_warn_different_system(&self.npm_system_info);
|
|
let mut builder = VfsBuilder::new(node_modules_path.clone())?;
|
|
builder.add_dir_recursive(node_modules_path)?;
|
|
Ok(builder)
|
|
} else {
|
|
// DO NOT include the user's registry url as it may contain credentials,
|
|
// but also don't make this dependent on the registry url
|
|
let registry_url = npm_resolver.registry_base_url();
|
|
let root_path =
|
|
npm_resolver.registry_folder_in_global_cache(registry_url);
|
|
let mut builder = VfsBuilder::new(root_path)?;
|
|
for package in npm_resolver.all_system_packages(&self.npm_system_info)
|
|
{
|
|
let folder =
|
|
npm_resolver.resolve_pkg_folder_from_pkg_id(&package.id)?;
|
|
builder.add_dir_recursive(&folder)?;
|
|
}
|
|
// overwrite the root directory's name to obscure the user's registry url
|
|
builder.set_root_dir_name("node_modules".to_string());
|
|
Ok(builder)
|
|
}
|
|
}
|
|
InnerCliNpmResolverRef::Byonm(npm_resolver) => {
|
|
maybe_warn_different_system(&self.npm_system_info);
|
|
// the root_node_modules directory will always exist for byonm
|
|
let node_modules_path = npm_resolver.root_node_modules_path().unwrap();
|
|
let parent_path = node_modules_path.parent().unwrap();
|
|
let mut builder = VfsBuilder::new(parent_path.to_path_buf())?;
|
|
let package_json_path = parent_path.join("package.json");
|
|
if package_json_path.exists() {
|
|
builder.add_file_at_path(&package_json_path)?;
|
|
}
|
|
if node_modules_path.exists() {
|
|
builder.add_dir_recursive(node_modules_path)?;
|
|
}
|
|
Ok(builder)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// This function sets the subsystem field in the PE header to 2 (GUI subsystem)
|
|
/// For more information about the PE header: https://learn.microsoft.com/en-us/windows/win32/debug/pe-format
|
|
fn set_windows_binary_to_gui(bin: &mut [u8]) -> Result<(), AnyError> {
|
|
// Get the PE header offset located in an i32 found at offset 60
|
|
// See: https://learn.microsoft.com/en-us/windows/win32/debug/pe-format#ms-dos-stub-image-only
|
|
let start_pe = u32::from_le_bytes((bin[60..64]).try_into()?);
|
|
|
|
// Get image type (PE32 or PE32+) indicates whether the binary is 32 or 64 bit
|
|
// The used offset and size values can be found here:
|
|
// https://learn.microsoft.com/en-us/windows/win32/debug/pe-format#optional-header-image-only
|
|
let start_32 = start_pe as usize + 28;
|
|
let magic_32 =
|
|
u16::from_le_bytes(bin[(start_32)..(start_32 + 2)].try_into()?);
|
|
|
|
let start_64 = start_pe as usize + 24;
|
|
let magic_64 =
|
|
u16::from_le_bytes(bin[(start_64)..(start_64 + 2)].try_into()?);
|
|
|
|
// Take the standard fields size for the current architecture (32 or 64 bit)
|
|
// This is the ofset for the Windows-Specific fields
|
|
let standard_fields_size = if magic_32 == 0x10b {
|
|
28
|
|
} else if magic_64 == 0x20b {
|
|
24
|
|
} else {
|
|
bail!("Could not find a matching magic field in the PE header")
|
|
};
|
|
|
|
// Set the subsystem field (offset 68) to 2 (GUI subsystem)
|
|
// For all possible options, see: https://learn.microsoft.com/en-us/windows/win32/debug/pe-format#optional-header-windows-specific-fields-image-only
|
|
let subsystem_offset = 68;
|
|
let subsystem_start =
|
|
start_pe as usize + standard_fields_size + subsystem_offset;
|
|
let subsystem: u16 = 2;
|
|
bin[(subsystem_start)..(subsystem_start + 2)]
|
|
.copy_from_slice(&subsystem.to_le_bytes());
|
|
Ok(())
|
|
}
|