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#![doc(html_root_url = "https://docs.rs/rust_release_artefact/0.1.3")] #![warn(missing_docs)] //! Safely extract installable files from Rust release artefacts. //! //! Introduction //! ============ //! //! Each new release of the Rust toolchain //! includes a number of components—some required, some optional—that //! can be combined together. //! These components are made available as artefacts //! in a standard format that includes the files to be installed, //! as well as metadata describing them. //! Installing a component //! is therefore more complex than //! just extracting an archive, //! since not all files should be placed in the destination. //! //! This library interprets a Rust artefact's metadata, //! and provides a list of the components it contains, //! as well as the specific list of installable files in each component. //! //! Once you've downloaded an artefact, //! use [`ExtractedArtefact::from_tar_gz()`] //! or [`ExtractedArtefact::from_tar_xz()`] //! to extract it and retrieve the metadata //! (the place you got the artefact from //! should tell you which format it's in). //! If you have previously extracted an artefact, //! you can re-read the metadata directly //! using [`ExtractedArtefact::new()`]. //! //! [`ExtractedArtefact::new()`]: struct.ExtractedArtefact.html#method.new //! [`ExtractedArtefact::from_tar_gz()`]: struct.ExtractedArtefact.html#method.from_tar_gz //! [`ExtractedArtefact::from_tar_xz()`]: struct.ExtractedArtefact.html#method.from_tar_xz //! //! First Example //! ============= //! //! extern crate rust_release_artefact as rra; //! //! use std::error; //! use std::fs; //! use std::io; //! use std::path; //! //! fn install_from_tar_gz( //! artefact_path: &path::Path, //! stage: &path::Path, //! component_name: &str, //! dest_root: &path::Path, //! ) -> Result<(), Box<error::Error>> { //! // Open the file containing the artefact. //! let handle = fs::File::open(artefact_path)?; //! //! // Extract it to the given staging path and read the metadata. //! // We're assuming the staging path is already canonicalized, and //! // the artefact is in .tar.gz format. //! let extracted_artefact = rra::ExtractedArtefact::from_tar_gz( //! io::BufReader::new(handle), //! stage, //! )?; //! //! // Get the requested component from the artefact. //! let component = extracted_artefact.components //! .get(component_name) //! .ok_or("Could not find component")?; //! //! println!( //! "Installing component {} version {} to {:?}", //! component_name, //! extracted_artefact.version, //! dest_root, //! ); //! //! // Install the component into the destination. //! // We're also assuming dest_root is already canonicalized. //! component.install_to(dest_root)?; //! //! // All done! //! Ok(()) //! } //! //! Capabilities //! ============ //! //! Extract downloaded artefacts //! ---------------------------- //! //! Once you have downloaded a release artefact, //! you can extract it into a staging area with //! the [`ExtractedArtefact::from_tar_gz()`] //! or [`ExtractedArtefact::from_tar_xz()`] functions //! (depending on the format). //! //! extern crate rust_release_artefact as rra; //! //! use std::fs; //! use std::io; //! use std::path; //! //! # fn example() -> Result<(), Box<std::error::Error>> { //! let handle = fs::File::open("path/to/artefact.tar.gz")?; //! //! // Make sure the staging area exists. //! let staging_area = path::Path::new("path/to/staging/area"); //! fs::create_dir_all(&staging_area)?; //! //! // Canonicalize the staging area path, so Windows can handle long path //! // names. //! let staging_area = staging_area.canonicalize()?; //! //! let extracted_artefact = rra::ExtractedArtefact::from_tar_gz( //! io::BufReader::new(handle), //! staging_area, //! )?; //! # Ok(()) //! # } //! //! Read artefact metadata //! ---------------------- //! //! An [`ExtractedArtefact`] struct //! represents the artefact's metadata, //! including the components in this artefact //! and the complete list of installable files in each component. //! //! # extern crate rust_release_artefact as rra; //! # fn example() -> Result<(), Box<std::error::Error>> { //! # let extracted_artefact = rra::ExtractedArtefact::new("src")?; //! //! println!("Version: {:?}", extracted_artefact.version); //! println!("Git commit hash: {:?}", extracted_artefact.git_commit_hash); //! //! for (name, component) in &extracted_artefact.components { //! println!("Component: {:?} in {:?}", name, component.root); //! for path in &component.files { //! println!(" - {:?}", path); //! } //! } //! # Ok(()) //! # } //! //! [`ExtractedArtefact`]: struct.ExtractedArtefact.html //! //! Install components to a given destination //! ----------------------------------------- //! //! The [`Component`] struct represents //! an installable component of the artefact, //! whose files are in the artefact's staging area, //! ready to be installed to a target location. //! The handy [`Component::install_to()`] method //! does exactly that. //! //! # extern crate rust_release_artefact as rra; //! # fn example() -> Result<(), Box<std::error::Error>> { //! # let extracted_artefact = rra::ExtractedArtefact::new("src")?; //! let component = extracted_artefact.components.get("my-component") //! .ok_or("no such component?")?; //! //! // Make sure the destination exists. //! let destination = std::path::Path::new("path/to/install/destination"); //! std::fs::create_dir_all(&destination)?; //! //! // Canonicalize the staging area path, so Windows can handle long path //! // names. //! let destination = destination.canonicalize()?; //! //! component.install_to(destination)?; //! # Ok(()) //! # } //! //! [`Component`]: struct.Component.html //! [`Component::install_to()`]: struct.Component.html#method.install_to //! extern crate libflate; #[macro_use] extern crate log; #[cfg(feature = "serde")] #[macro_use] extern crate serde; extern crate tar; extern crate walkdir; extern crate xz2; use std::collections; use std::error; use std::fmt; use std::fs; use std::io; use std::path; /// Returns the files described by the manifest in the given directory. fn read_manifest<A: AsRef<path::Path>>( root: A, ) -> Result<collections::BTreeSet<path::PathBuf>, Error> { let root = root.as_ref(); let manifest_path = root.join("manifest.in"); debug!("Reading component manifest from {:?}", manifest_path); let manifest = fs::File::open(manifest_path)?; let manifest = io::BufReader::new(manifest); let mut res = collections::BTreeSet::new(); use std::io::BufRead; for each in manifest.lines() { let line = each?; debug!("Read line: {:?}", line); if line.starts_with("file:") { let path = path::PathBuf::new().join(&line[5..]); debug!("Adding path {:?}", path); res.insert(path); } else if line.starts_with("dir:") { // Take the given path, split it on path-delimiters, then re-join // it back together. This does nothing on POSIX platforms, but on // Windows it should convert any slashes to backslashes. Windows // *generally* accepts either one in file-system paths, except in // the context of "NT-style" absolute paths when only backslashes // are accepted. So just to be safe, we'll convert them. let rel_path = path::Path::new(&line[4..]) .iter() .collect::<path::PathBuf>(); let walk_root = root.join(rel_path); for each in walkdir::WalkDir::new(&walk_root) { let each = each?; let path = each.path(); // We only care about installing files. if !each.file_type().is_file() { debug!("Item at {:?} is not a file, skipping", path); continue; } let relpath = path.strip_prefix(&root).map_err(|_| { // Somehow, even though we're not following // symlinks, we've wandered into a part of the // filesystem that's not below `root`. Not quite // sure how this happened, but not much we can do about it // now. Error::WildPath(walk_root.clone(), path.into()) })?; debug!("Adding path {:?}", relpath); res.insert(relpath.into()); } } else { return Err(Error::UnrecognisedManifestRule(line.into())); } } Ok(res) } /// The metadata and content of a previously-extracted artefact. /// /// Once you've downloaded a Rust release artefact, /// you must extract it to a staging area /// to examine it or install it. /// Use the [`from_tar_gz()`] or [`from_tar_xz()`] methods /// (whichever is appropriate) /// to extract your artefact. /// You may use a temporary directory as the staging area, /// or (if you might want to work with the same artefact again later) /// use a more permanent directory /// and call the [`new()`] method in future. /// /// When an `ExtractedArtefact` struct is created, /// all of the artefact metadata is read into memory, /// so it's still usable if the staging area is removed. /// However, this does not include the artefact *data*, /// so if you want to call [`Component::install_to()`] /// you'll need to keep the staging area around at least that long. /// /// Example /// ------- /// /// See [Read artefact metadata](index.html#read-artefact-metadata) /// in the crate-wide documentation. /// /// [`Component::install_to()`]: struct.Component.html#method.install_to /// [`new()`]: struct.ExtractedArtefact.html#method.new /// [`from_tar_gz()`]: struct.ExtractedArtefact.html#method.from_tar_gz /// [`from_tar_xz()`]: struct.ExtractedArtefact.html#method.from_tar_xz #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))] #[derive(Clone, Debug, Hash, PartialEq, Eq, PartialOrd, Ord)] pub struct ExtractedArtefact { /// The version of the package that was built to produce this artefact. /// /// This should be a [SemVer] version number of the form `X.Y.Z`, /// followed by a space, /// an open-parenthesis, /// a Git commit ID truncated to 9 digits, /// a space, /// the date of that commit in `YYYY-MM-DD` format, /// and a close-parenthesis: `1.2.3 (a1b2c3d4e 2018-04-17)` /// /// [SemVer]: https://semver.org/ pub version: String, /// The complete Git commit ID of this version of this package. /// /// Not every artefact includes a commit ID. pub git_commit_hash: Option<String>, /// A mapping from component names to the files each component contains. /// /// An artefact must contain at least one component, and may contain more. pub components: collections::BTreeMap<String, Component>, } impl ExtractedArtefact { /// Read previously-extracted artefact metadata. /// /// `stage` must be the path to /// a directory containing an extracted artefact, /// such as one populated by /// the [`from_tar_gz()`] or [`from_tar_xz()`] methods. /// /// Errors /// ------ /// /// This method may return any variant of [`Error`]. /// /// The staging area will not be modfied, /// even if an error is returned. /// /// Portability /// ----------- /// /// Rust release artefacts may include a deeply-nested directory structure, /// which can exceed Windows' traditional [260 character limit][winpath]. /// It is recommended that you canonicalize `stage` /// before passing it to this method, /// since the Windows canonical form /// lifts the path length limit to around 32,000 characters. /// /// [winpath]: https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx#maxpath /// /// Example /// ------- /// /// extern crate rust_release_artefact as rra; /// /// use std::error; /// use std::fs; /// use std::io; /// use std::path; /// /// fn extract_tar_gz_if_needed( /// source: &path::Path, /// stage: &path::Path, /// ) -> Result<rra::ExtractedArtefact, rra::Error> { /// /// // Before we go to all the effort of extracting this artefact, /// // perhaps it's already been extracted? /// match rra::ExtractedArtefact::new(stage) { /// /// // Yep, looks good, let's use it. /// Ok(extracted_artefact) => return Ok(extracted_artefact), /// /// // The stage is empty, let's continue extracting. /// Err(rra::Error::NoArtefacts(_)) => {} /// /// // The stage already contains a broken artefact, /// // and extracting another one won't help matters. /// Err(e) => return Err(e) /// } /// /// // Extract the given artefact. /// let handle = fs::File::open(source)?; /// let extracted_artefact = rra::ExtractedArtefact::from_tar_gz( /// io::BufReader::new(handle), /// stage, /// )?; /// /// // Everything's fine! /// Ok(extracted_artefact) /// } /// /// [`Error`]: enum.Error.html /// [`from_tar_gz()`]: struct.ExtractedArtefact.html#method.from_tar_gz /// [`from_tar_xz()`]: struct.ExtractedArtefact.html#method.from_tar_xz pub fn new<P: AsRef<path::Path>>( stage: P, ) -> Result<ExtractedArtefact, Error> { use io::Read; let stage = stage.as_ref(); debug!("Reading artefact from staging area {:?}", stage); // Figure out which subdirectory has the artefact in it. let artefact_path = { let mut artefact_paths = stage .read_dir()? .collect::<Result<Vec<_>, io::Error>>()? .into_iter() .map(|entry| entry.path()) .filter(|path| path.join("rust-installer-version").is_file()) .collect::<Vec<_>>(); debug!("Found potential artefacts: {:?}", artefact_paths); match artefact_paths.len() { 0 => return Err(Error::NoArtefacts(stage.to_owned())), 1 => artefact_paths.remove(0), _ => return Err(Error::MultipleArtefacts(stage.to_owned())), } }; // Check the artefact is in the correct format. let artefact_format_path = artefact_path.join("rust-installer-version"); debug!("Reading artefact format from {:?}", artefact_format_path); let mut artefact_format = String::new(); fs::File::open(artefact_format_path)? .read_to_string(&mut artefact_format)?; if artefact_format.trim() != "3" { return Err(Error::UnrecognisedFormat(artefact_format)); } // Read the artefact version. let version_path = artefact_path.join("version"); debug!("Reading artefact version from {:?}", version_path); let mut version = String::new(); fs::File::open(version_path)?.read_to_string(&mut version)?; // Read the artefact's commit hash. let hash_path = artefact_path.join("git-commit-hash"); debug!("Reading git commit hash from {:?}", hash_path); let mut buf = String::new(); let git_commit_hash = fs::File::open(hash_path) .and_then(|mut handle| handle.read_to_string(&mut buf)) .map(|_| buf) .ok(); // Read the list of artefact components. let components_path = artefact_path.join("components"); debug!("Reaading artefact components from {:?}", components_path); let mut component_names = String::new(); fs::File::open(components_path)?.read_to_string(&mut component_names)?; let mut components = collections::BTreeMap::new(); for name in component_names.lines() { let root = artefact_path.join(name); let files = read_manifest(&root)?; if files.len() == 0 { return Err(Error::EmptyComponent(name.into())); } components.insert(name.to_owned(), Component { root, files }); } if components.len() == 0 { return Err(Error::NoComponents); } Ok(ExtractedArtefact { version, git_commit_hash, components, }) } /// Extract an artefact in `.tar.gz` format and read its metadata. /// /// The artefact `source` is extracted to the directory `stage`, /// and its content is read to produce an `ExtractedArtefact`. /// Nothing will be written outside `stage`, /// even if a malformed artefact attempts to do so. /// /// `stage` must already exist and be writable; /// if it is not empty then the extracted artefact /// may be corrupted by the existing contents. /// You may want to create a fresh, temporary `stage` directory /// every time you want to examine an artefact, /// but since extraction is expensive /// you could also create a permanent directory with a predictable name. /// If the directory exists, /// pass it to the [`new()`] method, /// otherwise create it and pass it to this function. /// /// If your artefact is in `.tar.xz` format, /// see [`from_tar_xz()`]. /// /// Errors /// ------ /// /// This function may return any of the variants of the [`Error`] enum. /// /// If an error is returned, /// the staging area may be left in an invalid state. /// You may re-attempt extracting the same artefact to the staging area, /// but don't extract another artefact to it, /// or try to use it with the [`new()`] method. /// /// Portability /// ----------- /// /// Rust release artefacts may include a deeply-nested directory structure, /// which can exceed Windows' traditional [260 character limit][winpath]. /// It is recommended that you canonicalize `stage` /// before passing it to this method, /// since the Windows canonical form /// lifts the path length limit to around 32,000 characters. /// /// [winpath]: https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx#maxpath /// /// Example /// ------- /// /// extern crate rust_release_artefact as rra; /// /// use std::fs; /// use std::io; /// use std::path; /// /// # fn example() -> Result<(), Box<std::error::Error>> { /// let handle = fs::File::open("path/to/artefact.tar.gz")?; /// /// // Make sure the staging area exists. /// let staging_area = path::Path::new("path/to/staging/area"); /// fs::create_dir_all(&staging_area)?; /// /// // Canonicalize the staging area path, so Windows can handle long path /// // names. /// let staging_area = staging_area.canonicalize()?; /// /// let extracted_artefact = rra::ExtractedArtefact::from_tar_gz( /// io::BufReader::new(handle), /// staging_area, /// )?; /// # Ok(()) /// # } /// /// [`Error`]: enum.Error.html /// [`new()`]: struct.ExtractedArtefact.html#method.new /// [`from_tar_xz()`]: struct.ExtractedArtefact.html#method.from_tar_xz pub fn from_tar_gz<R: io::BufRead, P: AsRef<path::Path>>( source: R, stage: P, ) -> Result<ExtractedArtefact, Error> { debug!("Decompressing source with gzip"); let source = libflate::gzip::Decoder::new(source)?; debug!("Unpacking source as tar file"); tar::Archive::new(source).unpack(stage.as_ref())?; ExtractedArtefact::new(stage) } /// Extract an artefact in `.tar.xz` format and read its metadata. /// /// The artefact `source` is extracted to the directory `stage`, /// and its content is read to produce an `ExtractedArtefact`. /// Nothing will be written outside `stage`, /// even if a malformed artefact attempts to do so. /// /// `stage` must already exist and be writable; /// if it is not empty then the extracted artefact /// may be corrupted by the existing contents. /// You may want to create a fresh, temporary `stage` directory /// every time you want to examine an artefact, /// but since extraction is expensive /// you could also create a permanent directory with a predictable name. /// If the directory exists, /// pass it to the [`new()`] method, /// otherwise create it and pass it to this function. /// /// If your artefact is in `.tar.gz` format, /// see [`from_tar_gz()`]. /// /// Errors /// ------ /// /// This function may return any of the variants of the [`Error`] enum. /// /// If an error is returned, /// the staging area may be left in an invalid state. /// You may re-attempt extracting the same artefact to the staging area, /// but don't extract another artefact to it, /// or try to use it with the [`new()`] method. /// /// Portability /// ----------- /// /// Rust release artefacts may include a deeply-nested directory structure, /// which can exceed Windows' traditional [260 character limit][winpath]. /// It is recommended that you canonicalize `stage` /// before passing it to this method, /// since the Windows canonical form /// lifts the path length limit to around 32,000 characters. /// /// [winpath]: https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx#maxpath /// /// Example /// ------- /// /// extern crate rust_release_artefact as rra; /// /// use std::fs; /// use std::io; /// use std::path; /// /// # fn example() -> Result<(), Box<std::error::Error>> { /// let handle = fs::File::open("path/to/artefact.tar.xz")?; /// /// // Make sure the staging area exists. /// let staging_area = path::Path::new("path/to/staging/area"); /// fs::create_dir_all(&staging_area)?; /// /// // Canonicalize the staging area path, so Windows can handle long path /// // names. /// let staging_area = staging_area.canonicalize()?; /// /// let extracted_artefact = rra::ExtractedArtefact::from_tar_xz( /// io::BufReader::new(handle), /// staging_area, /// )?; /// # Ok(()) /// # } /// /// [`Error`]: enum.Error.html /// [`new()`]: struct.ExtractedArtefact.html#method.new /// [`from_tar_gz()`]: struct.ExtractedArtefact.html#method.from_tar_gz pub fn from_tar_xz<R: io::BufRead, P: AsRef<path::Path>>( source: R, stage: P, ) -> Result<ExtractedArtefact, Error> { debug!("Decompressing source with xz"); let source = xz2::bufread::XzDecoder::new(source); debug!("Unpacking source as tar file"); tar::Archive::new(source).unpack(stage.as_ref())?; ExtractedArtefact::new(stage) } } /// An installable component of an artefact. /// /// A `Component` describes a subset of /// the files in an [`ExtractedArtefact`], /// which you may want to install in a target location. /// For example, /// in order to compile Rust programs, /// you will need to install all the files of both /// the `rustc` (compiler) and `rust-std` (standard library) components /// into the same location. /// /// A `Component` does not store all the relevant files itself, /// but just their paths inside /// the `ExtractedArtefact`'s staging area. /// Therefore, if you want to use the files described by a `Component`, /// you must ensure the staging area is not cleaned up /// before you use them. /// /// Example /// ------- /// /// extern crate rust_release_artefact as rra; /// /// use std::fs; /// use std::io; /// use std::path; /// use std::process; /// /// # fn example() -> Result<(), Box<std::error::Error>> { /// # let handle = fs::File::open("path/to/artefact.tar.xz")?; /// # let extracted_artefact = rra::ExtractedArtefact::from_tar_xz( /// # io::BufReader::new(handle), /// # "path/to/staging/area/", /// # )?; /// // Assume we have an artefact containing a Cargo component. /// let cargo = extracted_artefact.components /// .get("cargo") /// .ok_or("Artefact does not contain cargo component")?; /// /// // Make sure our destination exists. /// let dest_root = path::Path::new("path/to/my/rust/toolchain"); /// fs::create_dir_all(&dest_root)?; /// /// // Canonicalize our destination path, so Windows can handle long path /// // names. /// let dest_root = dest_root.canonicalize()?; /// /// // Install it to our target location. /// cargo.install_to(&dest_root)?; /// /// // Now we should be able to run Cargo. /// process::Command::new(dest_root.join("bin/cargo")) /// .arg("build") /// .arg("--release") /// .spawn()?; /// /// # Ok(()) /// # } /// /// [`ExtractedArtefact`]: struct.ExtractedArtefact.html #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))] #[derive(Clone, Debug, Hash, PartialEq, Eq, PartialOrd, Ord)] pub struct Component { /// The absolute filesystem path to /// the directory containing all the files in the component. pub root: path::PathBuf, /// Relative paths from `root` to each file in the component. /// /// When installing this component, /// place each file at the same relative path /// inside the destination directory. pub files: collections::BTreeSet<path::PathBuf>, } impl Component { /// Install this component's files into the destination directory. /// /// `dest_root` should be a writable directory, /// or a path at which a writable directory may be created. /// /// For each relative path in `self.files`, /// this method constructs a source path by joining it to `self.root`, /// a destination path by joining it to `dest_root`, /// and then installs the file at the source path to the destination. /// /// To increase performance and reduce disk-space usage, /// this method will attempt to hard-link files rather than copying them. /// If hard-linking a file is not possible, it will be copied instead. /// /// Errors /// ------ /// /// This method will return an error if `dest_root` /// or a directory within it could not be created, /// if a destination file already exists /// and could not be removed, /// or if a file could not be copied. /// /// Portability /// ----------- /// /// Components may include a deeply-nested directory structure, /// which can exceed Windows' traditional [260 character limit][winpath]. /// It is recommended that you use canonicalize `dest_root` /// before passing it to this method, /// since the Windows canonical form /// lifts the path length limit to around 32,000 characters. /// /// [winpath]: https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx#maxpath /// /// Example /// ------- /// /// See the [`Component`] documentation. /// /// [`Component`]: struct.Component.html#example pub fn install_to<P: AsRef<path::Path>>( &self, dest_root: P, ) -> io::Result<()> { for relative_path in &self.files { // Take the given path, split it on path-delimiters, then re-join // it back together. This does nothing on POSIX platforms, but on // Windows it should convert any slashes to backslashes. Windows // *generally* accepts either one in file-system paths, except in // the context of "NT-style" absolute paths when only backslashes // are accepted. So just to be safe, we'll convert them. let relative_path = relative_path.iter().collect::<path::PathBuf>(); let source_path = self.root.join(&relative_path); let dest_path = dest_root.as_ref().join(&relative_path); debug!("Installing from {:?} to {:?}", source_path, dest_path); // Make sure the destination exists. fs::create_dir_all( dest_path.parent().unwrap_or(dest_root.as_ref()), )?; // Hard-linking will fail if the destination exists, and copying // might break things if the destination exists and is a hard-link // to the source. Since we want to blow away the target anyway, // let's just remove it immediately. fs::remove_file(&dest_path).or_else(|err| { if err.kind() == io::ErrorKind::NotFound { // Already gone! No worries here. Ok(()) } else { // Something else went wrong, report it. Err(err) } })?; fs::hard_link(&source_path, &dest_path).or_else(|_| { // Can't hard-link it, let's try copying instead. fs::copy(&source_path, &dest_path).map(|_| ()) })?; } Ok(()) } } /// All the possible errors this crate can produce. #[derive(Debug)] pub enum Error { /// A filesystem access or permission error. /// /// Straight from `std::io` in the Rust standard library, /// this could be anything related to reading or writing the filesystem, /// including permission errors, /// missing files, /// or metadata files containing invalid UTF-8 data. IoError(io::Error), /// A filesystem navigation error. /// /// Straight from the `walkdir` crate, /// this error arises while interpreting artefact metadata /// and looking for all the files that belong to a component. WalkDirError(walkdir::Error), /// The given source or stage contains no valid release artefacts. /// /// Returned when an [`ExtractedArtefact`] is created /// from an archive or stage directory /// that does not contain release artefact metadata. /// /// The included `PathBuf` is the absolute path /// to the directory that does not contain any artefacts. /// /// [`ExtractedArtefact`]: struct.ExtractedArtefact.html NoArtefacts(path::PathBuf), /// The given source or stage contains multiple release artefacts. /// /// Returned when an [`ExtractedArtefact`] is created /// from an archive or stage directory /// that contains multiple sets of release artefact metadata. /// This is a problem because [`ExtractedArtefact`] /// can only represent a single artefact's metadata. /// /// The included `PathBuf` is the absolute path /// to the directory that contains multiple sets of artefact metadata. /// /// [`ExtractedArtefact`]: struct.ExtractedArtefact.html MultipleArtefacts(path::PathBuf), /// The given source or stage contains artefact metadata in an unrecognised /// format. /// /// Rust's release artefacts include a marker file /// that describes which version of the metadata format they use. /// This error is returned when an [`ExtractedArtefact`] is created /// from an archive or stage directory /// that contains a marker file /// that mentions an unrecognised metadata format. /// /// The included `String` is the content of the marker file. /// /// [`ExtractedArtefact`]: struct.ExtractedArtefact.html UnrecognisedFormat(String), /// The artefact metadata lists no components. /// /// Returned when an [`ExtractedArtefact`] is created /// from an archive or stage directory /// whose metadata includes an empty list of components. /// /// [`ExtractedArtefact`]: struct.ExtractedArtefact.html NoComponents, /// A component contains no files. /// /// Returned when an [`ExtractedArtefact`] is created /// from an archive or stage directory /// where a component's manifest lists no files. /// /// The included `String` is the name of the problem component. /// /// [`ExtractedArtefact`]: struct.ExtractedArtefact.html EmptyComponent(String), /// A component's manifest contains an unrecognised rule. /// /// Returned when an [`ExtractedArtefact`] is created /// from an archive or stage directory /// where a component's manifest /// (which is a list of rules describing /// which files this component installs) /// includes an unrecognised rule. /// /// The included `String` is the text of the unrecognised rule. /// /// [`ExtractedArtefact`]: struct.ExtractedArtefact.html UnrecognisedManifestRule(String), /// While scanning for files inside a component, /// a file was found outside that component's directory. /// /// This should not be possible, /// so if it happens something has gone horribly wrong. /// /// The included paths are the component directory being scanned, /// and the file that was found outside it, respectively. WildPath(path::PathBuf, path::PathBuf), } impl std::convert::From<io::Error> for Error { fn from(err: io::Error) -> Error { Error::IoError(err) } } impl std::convert::From<walkdir::Error> for Error { fn from(err: walkdir::Error) -> Error { Error::WalkDirError(err) } } impl fmt::Display for Error { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { match self { &Error::IoError(ref inner) => write!(f, "{}", inner), &Error::WalkDirError(ref inner) => write!(f, "{}", inner), &Error::NoArtefacts(ref path) => { write!(f, "Staging area {:?} contains no artefacts", path) } &Error::MultipleArtefacts(ref path) => { write!(f, "Staging area {:?} contains multiple artefacts", path) } &Error::UnrecognisedFormat(ref value) => { write!(f, "Artefact in unrecognised format {:?}", value) } &Error::NoComponents => write!(f, "Artefact has no components"), &Error::EmptyComponent(ref name) => { write!(f, "Artefact component {:?} contains no files", name) } &Error::UnrecognisedManifestRule(ref rule) => { write!(f, "Component manifest has unrecognised rule {:?}", rule,) } &Error::WildPath(ref root, ref path) => write!( f, "While exploring {:?}, found outside path {:?}", root, path, ), } } } impl error::Error for Error { fn description(&self) -> &str { match self { &Error::IoError(ref inner) => { <_ as error::Error>::description(inner) } &Error::WalkDirError(ref inner) => { <_ as error::Error>::description(inner) } &Error::NoArtefacts(_) => "Staging area contains no artefacts", &Error::MultipleArtefacts(_) => { "Staging area contains multiple artefacts" } &Error::UnrecognisedFormat(_) => "Artefact is in an unknown format", &Error::NoComponents => "Artefact contains no components", &Error::EmptyComponent(_) => "Artefact component contains no files", &Error::UnrecognisedManifestRule(_) => { "Component manifest has unrecognised rule" } &Error::WildPath(_, _) => { "While exploring within a directory, found a path outside it." } } } } #[cfg(test)] mod tests { extern crate env_logger; extern crate tempfile; extern crate walkdir; use std::collections; use std::fs; use std::io; use std::path; use std::io::Read; use std::io::Write; fn make_extracted_artefact() -> io::Result<tempfile::TempDir> { let stage = tempfile::tempdir()?; let artefact_path = stage.path().join("some-artefact"); fs::create_dir_all(&artefact_path)?; fs::File::create(artefact_path.join("rust-installer-version"))? .write(b"3\n")?; fs::File::create(artefact_path.join("version"))? .write(b"1.2.3 (4d90ac38c 2018-04-03)")?; fs::File::create(artefact_path.join("git-commit-hash"))? .write(b"4d90ac38c0b61bb69470b61ea2cccea0df48d9e5")?; fs::File::create(artefact_path.join("components"))? .write(b"component-a\ncomponent-b\n")?; let component_a_path = artefact_path.join("component-a"); fs::create_dir_all(&component_a_path)?; fs::File::create(component_a_path.join("a-file-1"))? .write(b"a-data-1")?; fs::File::create(component_a_path.join("a-file-2"))? .write(b"a-data-2")?; fs::File::create(component_a_path.join("manifest.in"))? .write(b"file:a-file-1\nfile:a-file-2\n")?; let component_b_path = artefact_path.join("component-b"); fs::create_dir_all(&component_b_path)?; fs::File::create(component_b_path.join("b-file-1"))? .write(b"b-data-1")?; let component_b_subdir_path = component_b_path.join("subdir"); fs::create_dir_all(&component_b_subdir_path)?; fs::File::create(component_b_subdir_path.join("sub-file-1"))? .write(b"sub-data-1")?; fs::File::create(component_b_subdir_path.join("sub-file-2"))? .write(b"sub-data-2")?; fs::File::create(component_b_subdir_path.join("sub-file-3"))? .write(b"sub-data-3")?; fs::File::create(component_b_path.join("manifest.in"))? .write(b"file:b-file-1\ndir:subdir\n")?; Ok(stage) } #[test] fn open_extracted_artefact() { let _ = env_logger::try_init(); let stage = make_extracted_artefact().unwrap(); let artefact = super::ExtractedArtefact::new(stage.path()).unwrap(); assert_eq!(artefact.version, "1.2.3 (4d90ac38c 2018-04-03)",); assert_eq!( artefact.git_commit_hash, Some("4d90ac38c0b61bb69470b61ea2cccea0df48d9e5".into()), ); assert_eq!( artefact.components.keys().collect::<Vec<_>>(), vec!["component-a", "component-b"], ); assert_eq!( artefact.components.get("component-a").unwrap(), &super::Component { root: stage.path().join("some-artefact/component-a"), files: { let mut res = collections::BTreeSet::new(); res.insert(path::PathBuf::new().join("a-file-1")); res.insert(path::PathBuf::new().join("a-file-2")); res }, }, ); assert_eq!( artefact.components.get("component-b").unwrap(), &super::Component { root: stage.path().join("some-artefact/component-b"), files: { let mut res = collections::BTreeSet::new(); res.insert(path::PathBuf::new().join("b-file-1")); res.insert(path::PathBuf::new().join("subdir/sub-file-1")); res.insert(path::PathBuf::new().join("subdir/sub-file-2")); res.insert(path::PathBuf::new().join("subdir/sub-file-3")); res }, }, ); assert_eq!(artefact.components.get("component-c"), None); } #[test] fn test_no_artefacts_found() { let _ = env_logger::try_init(); let stage = make_extracted_artefact().unwrap(); // Remove the format version marker fs::remove_file( stage.path().join("some-artefact/rust-installer-version"), ).unwrap(); let err = super::ExtractedArtefact::new(stage.path()).expect_err( "Artefact did not detect missing artefact format file?", ); assert_eq!( format!("{}", err), format!("Staging area {:?} contains no artefacts", stage.path()), ); } #[test] fn test_multiple_artefacts_found() { let _ = env_logger::try_init(); let stage = make_extracted_artefact().unwrap(); // Create another format version marker in a different directory. let other_artefact_path = stage.path().join("other-artefact"); fs::create_dir_all(&other_artefact_path).unwrap(); fs::File::create(other_artefact_path.join("rust-installer-version")) .unwrap() .write(b"3\n") .unwrap(); let err = super::ExtractedArtefact::new(stage.path()).expect_err( "Artefact did not detect multiple artefact format files?", ); assert_eq!( format!("{}", err), format!( "Staging area {:?} contains multiple artefacts", stage.path() ), ); } #[test] fn test_wrong_artefact_format() { let _ = env_logger::try_init(); let stage = make_extracted_artefact().unwrap(); // Change the format marker to a different value. fs::OpenOptions::new() .write(true) .truncate(true) .open(stage.path().join("some-artefact/rust-installer-version")) .unwrap() .write(b"37") .unwrap(); let err = super::ExtractedArtefact::new(stage.path()) .expect_err("Artefact did not detect bogus version?"); assert_eq!( format!("{}", err), "Artefact in unrecognised format \"37\"", ); } #[test] fn test_artefact_with_no_version() { let _ = env_logger::try_init(); let stage = make_extracted_artefact().unwrap(); // Remove the version file fs::remove_file(stage.path().join("some-artefact/version")).unwrap(); let err = super::ExtractedArtefact::new(stage.path()) .expect_err("Artefact did not detect missing version?"); assert_eq!( format!("{}", err), "No such file or directory (os error 2)", ); } #[test] fn test_artefact_with_no_git_commit_hash() { let _ = env_logger::try_init(); let stage = make_extracted_artefact().unwrap(); // Remove the version file fs::remove_file(stage.path().join("some-artefact/git-commit-hash")) .unwrap(); let artefact = super::ExtractedArtefact::new(stage.path()) .expect("Artefact requires git commit hash?"); assert_eq!(artefact.git_commit_hash, None); } #[test] fn test_artefact_with_no_component_list() { let _ = env_logger::try_init(); let stage = make_extracted_artefact().unwrap(); // Remove the component list fs::remove_file(stage.path().join("some-artefact/components")).unwrap(); let err = super::ExtractedArtefact::new(stage.path()) .expect_err("Artefact did not detect missing component list?"); assert_eq!( format!("{}", err), "No such file or directory (os error 2)", ); } #[test] fn test_artefact_with_empty_component_list() { let _ = env_logger::try_init(); let stage = make_extracted_artefact().unwrap(); // Truncate the component list fs::OpenOptions::new() .write(true) .truncate(true) .open(stage.path().join("some-artefact/components")) .unwrap(); let err = super::ExtractedArtefact::new(stage.path()) .expect_err("Artefact did not detect empty component list?"); assert_eq!(format!("{}", err), "Artefact has no components"); } #[test] fn test_artefact_with_invalid_utf8_component_name() { let _ = env_logger::try_init(); let stage = make_extracted_artefact().unwrap(); // Write invalid UTF-8 to the component list fs::OpenOptions::new() .write(true) .append(true) .open(stage.path().join("some-artefact/components")) .unwrap() .write(b"\x88\x88\n") .unwrap(); let err = super::ExtractedArtefact::new(stage.path()) .expect_err("Artefact did not detect invalid component name?"); assert_eq!(format!("{}", err), "stream did not contain valid UTF-8",); } #[test] fn test_artefact_with_nul_in_component_name() { let _ = env_logger::try_init(); let stage = make_extracted_artefact().unwrap(); // Write invalid UTF-8 to the component list fs::OpenOptions::new() .write(true) .append(true) .open(stage.path().join("some-artefact/components")) .unwrap() .write(b"invalid\0component\n") .unwrap(); let err = super::ExtractedArtefact::new(stage.path()) .expect_err("Artefact did not detect invalid component name?"); assert_eq!(format!("{}", err), "data provided contains a nul byte",); } #[test] fn test_artefact_with_missing_components() { let _ = env_logger::try_init(); let stage = make_extracted_artefact().unwrap(); // Add an extra component to the list fs::OpenOptions::new() .write(true) .append(true) .open(stage.path().join("some-artefact/components")) .unwrap() .write(b"missing-component\n") .unwrap(); let err = super::ExtractedArtefact::new(stage.path()) .expect_err("Artefact did not detect bogus component?"); assert_eq!( format!("{}", err), "No such file or directory (os error 2)", ); } #[test] fn test_component_with_invalid_manifest_line() { let _ = env_logger::try_init(); let stage = make_extracted_artefact().unwrap(); // Add a bogus entry to a component manifest. fs::OpenOptions::new() .write(true) .append(true) .open(stage.path().join("some-artefact/component-a/manifest.in")) .unwrap() .write(b"bogus\n") .unwrap(); let err = super::ExtractedArtefact::new(stage.path()) .expect_err("Artefact did not detect bogus manifest?"); assert_eq!( format!("{}", err), "Component manifest has unrecognised rule \"bogus\"", ); } #[test] fn test_component_install() { let _ = env_logger::try_init(); let stage = make_extracted_artefact().unwrap(); let artefact = super::ExtractedArtefact::new(stage.path()).unwrap(); fn files_in_path(path: &path::Path) -> Vec<path::PathBuf> { let mut res = walkdir::WalkDir::new(path) .into_iter() .filter(|r| r.is_ok()) .map(|r| r.unwrap()) .filter(|dentry| dentry.file_type().is_file()) .map(|dentry| dentry.path().to_path_buf()) .collect::<Vec<_>>(); res.sort(); res } // Extract component-a to a temporary directory. let dest_a = tempfile::tempdir().unwrap(); artefact .components .get("component-a") .unwrap() .install_to(dest_a.path()) .expect("Could not install component-a"); // Make sure we created all the files we expected. assert_eq!( files_in_path(dest_a.path()), vec![ dest_a.path().join("a-file-1"), dest_a.path().join("a-file-2"), ], ); // Extract component-b to a temporary directory. let dest_b = tempfile::tempdir().unwrap(); artefact .components .get("component-b") .unwrap() .install_to(dest_b.path()) .expect("Could not install component-b"); assert_eq!( files_in_path(dest_b.path()), vec![ dest_b.path().join("b-file-1"), dest_b.path().join("subdir/sub-file-1"), dest_b.path().join("subdir/sub-file-2"), dest_b.path().join("subdir/sub-file-3"), ], ); } #[test] fn double_installation_does_not_corrupt_source() { let stage = make_extracted_artefact().unwrap(); let artefact = super::ExtractedArtefact::new(stage.path()).unwrap(); // Install component-b let dest_b = tempfile::tempdir().unwrap(); let component_b = artefact.components.get("component-b").unwrap(); component_b .install_to(dest_b.path()) .expect("Could not install component-b"); // Let's check the source is still OK. let mut b_file = fs::File::open(component_b.root.join("b-file-1")).unwrap(); let mut buf = String::new(); b_file .read_to_string(&mut buf) .expect("Could not read b-file-1"); assert_eq!(buf, "b-data-1"); } #[test] fn errors_are_send_and_sync() { fn assert_send<T: Send>() {} fn assert_sync<T: Sync>() {} assert_send::<super::Error>(); assert_sync::<super::Error>(); } }