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use crate::{DepKind, Edge, Error, Kid, Krates}; use cargo_metadata as cm; use std::{ collections::HashMap, path::{Path, PathBuf}, }; /// An alternative to cargo_metadata::MetadataCommand which allows correct /// feature usage, as well as ensuring that the command can run successfully /// regardless of where it is executed and on what. #[derive(Default, Debug)] pub struct Cmd { cargo_path: Option<PathBuf>, manifest_path: Option<PathBuf>, current_dir: Option<PathBuf>, features: Vec<String>, other_options: Vec<String>, all_features: bool, no_default_features: bool, } impl Cmd { pub fn new() -> Self { Self::default() } /// Path to `cargo` executable. If not set, this will use the the `$CARGO` /// environment variable, and if that is not set, will simply be `cargo`. pub fn cargo_path(&mut self, path: impl Into<PathBuf>) -> &mut Self { self.cargo_path = Some(path.into()); self } /// Path to a `Cargo.toml` manifest pub fn manifest_path(&mut self, path: impl Into<PathBuf>) -> &mut Self { self.manifest_path = Some(path.into()); self } /// Current directory of the `cargo metadata` process. pub fn current_dir(&mut self, path: impl Into<PathBuf>) -> &mut Self { self.current_dir = Some(path.into()); self } /// Disables default features. /// /// **NOTE**: This has **no effect** if used on a workspace. You must /// specify a working directory or manifest path to a specific crate if used /// on a crate inside a workspace. pub fn no_default_features(&mut self) -> &mut Self { self.no_default_features = true; self } /// Enables all features for all workspace crates. Usable on both individual /// crates and on an entire workspace. pub fn all_features(&mut self) -> &mut Self { self.all_features = true; self } /// Enables specific features. See the **NOTE** for `no_default_features` pub fn features(&mut self, feats: impl IntoIterator<Item = String>) -> &mut Self { self.features.extend(feats); self } /// Arbitrary command line flags to pass to `cargo`. These will be added to /// the end of the command line invocation. pub fn other_options(&mut self, options: impl IntoIterator<Item = String>) -> &mut Self { self.other_options.extend(options); self } } impl Into<cm::MetadataCommand> for Cmd { fn into(mut self) -> cm::MetadataCommand { let mut mdc = cm::MetadataCommand::new(); if let Some(cp) = self.cargo_path { mdc.cargo_path(cp); } // If the manifest path is set, we force set the current working // directory to its parent and use the relative path, this is to fix an // edge case where you can run cargo metadata from a directory outside // of a workspace which could fail if eg. there is a reference to a // registry that is defined in the workspace's .cargo/config if let Some(mp) = self.manifest_path { self.current_dir = Some(mp.parent().unwrap().to_owned()); mdc.manifest_path("Cargo.toml"); } if let Some(cd) = self.current_dir { mdc.current_dir(cd); } // Everything else we specify as additional options, as MetadataCommand // does not handle features correctly, eg. you cannot disable default // and set specific ones at the same time // https://github.com/oli-obk/cargo_metadata/issues/79 self.features.sort(); self.features.dedup(); let mut opts = Vec::with_capacity( self.features.len() + self.other_options.len() + if self.no_default_features { 1 } else { 0 } + if self.all_features { 1 } else { 0 }, ); if self.no_default_features { opts.push("--no-default-features".to_owned()); } if self.all_features { opts.push("--all-features".to_owned()); } if !self.features.is_empty() { opts.push("--features".to_owned()); opts.append(&mut self.features); } opts.append(&mut self.other_options); mdc.other_options(opts); mdc } } enum TargetFilter { Known(&'static cfg_expr::targets::TargetInfo, Vec<String>), Unknown(String, Vec<String>), } /// The scope for which a dependency kind will be ignored #[derive(Clone, Copy)] pub enum Scope { /// Will match a dependency from a crate in the workspace Workspace, /// Will match a dependency from any crate not in the workspace NonWorkspace, /// Will ignore a dependency from any crate All, } /// Trait used to report back any crates that are completely ignored in the /// final crate graph that is built. This occurs when the crate has no /// dependents any longer due to the applied filters. pub trait OnFilter { fn filtered(&mut self, krate: cm::Package); } /// For when you just want to satisfy OnFilter without doing anything pub struct NoneFilter; impl OnFilter for NoneFilter { fn filtered(&mut self, _: cm::Package) {} } impl<F> OnFilter for F where F: FnMut(cm::Package), { fn filtered(&mut self, krate: cm::Package) { self(krate) } } /// A builder used to create a Krates graph, either by running a cargo metadata /// command, or using an already deserialized `cargo_metadata::Metadata` #[derive(Default)] pub struct Builder { target_filters: Vec<TargetFilter>, workspace_filters: Vec<PathBuf>, exclude: Vec<crate::PkgSpec>, workspace: bool, ignore_kinds: u32, } impl Builder { pub fn new() -> Self { Self::default() } /// Ignores a specific dependency kind in the given scope. /// /// ``` /// # use krates::{Builder, DepKind, Scope}; /// Builder::new().ignore_kind(DepKind::Build, Scope::NonWorkspace); /// ``` /// /// In the above example, let's say we depended on `zstd`. zstd depends on /// the `cc` crate (`zstd -> zstd-safe -> zstd-sys -> cc`) for building /// C code. By ignoring the `build` kind for non-workspace crates, the link /// from `zstd-sys` -> `cc` will be filtered out. If the same `cc` is not /// depended on by a crate in the workspace, `cc` will not end up in the /// final `Krates` graph. /// /// Note that ignoring `DepKind::Dev` for `Scope::NonWorkspace` is /// meaningless as dev dependencies are not resolved by cargo for transitive /// dependencies. pub fn ignore_kind(&mut self, kind: DepKind, scope: Scope) -> &mut Self { let kind_flag = match kind { DepKind::Normal => 0x1, DepKind::Dev => 0x8, DepKind::Build => 0x40, }; self.ignore_kinds |= kind_flag; self.ignore_kinds |= match scope { Scope::Workspace => kind_flag << 1, Scope::NonWorkspace => kind_flag << 2, Scope::All => kind_flag << 1 | kind_flag << 2, }; self } /// By default, the response from `cargo metadata` determines what the /// root(s) of the crate graph will be. If the Cargo.toml path used is a /// virtual manifest, then each workspace member will be used as a root. If /// the manifest path is for a single crate, or a non-virtual manifest /// inside a workspace, then only that single crate will be used as the /// root, and in the workspace case, only other workspace members that are /// dependencies of that root crate, directly or indirectly, will be /// included in the final graph. /// /// Setting workspace = true will change that default behavior, and instead /// include all workspace crates (unless they are filtered via other /// methods) even if the manifest path is not a virtual manifest inside /// a workspace /// /// ``` /// # use krates::Builder; /// Builder::new().workspace(true); /// ``` pub fn workspace(&mut self, workspace: bool) -> &mut Self { self.workspace = workspace; self } /// Package specification(s) to exclude from the final graph. Unlike with /// cargo, each exclusion spec can apply to more than 1 instance of a /// package, eg if multiple crates are sourced from the same url, or /// multiple versions of the same crate /// /// ``` /// # use krates::Builder; /// Builder::new().exclude(["a-crate:0.1.0"].iter().map(|spec| spec.parse().unwrap())); /// ``` pub fn exclude<I>(&mut self, exclude: I) -> &mut Self where I: IntoIterator<Item = crate::PkgSpec>, { self.exclude.extend(exclude); self } /// By default, every workspace crate is treated as a root node and /// implicitly added to the graph if the graph is built from a workspace /// context and not a specific crate in the workspace. /// /// By using this method, only the workspace crates whose Cargo.toml path /// matches one of the specified crates will be added as root nodes, meaning /// that any workspace crate not in the list that doesn't have any /// dependendents on a workspace crate that does, will no longer appear in /// the graph. /// /// If you specify only a single path, and that path is actually to a /// a workspace's virtual manifest, the graph will be the same as if /// invlude_workspace_crates was not specified. /// /// ``` /// # use krates::{Builder, DepKind, Scope}; /// Builder::new().include_workspace_crates(&["path/to/some/crate"]); /// ``` pub fn include_workspace_crates<P, I>(&mut self, crates: I) -> &mut Self where P: AsRef<Path>, I: IntoIterator<Item = P>, { self.workspace_filters.extend(crates.into_iter().map(|p| { // It's the users's responsibility to give proper paths here, as // we can't rely on eg canonicalization since we might not be on // the same filesystem any more. We do fixup the ensure they point // at a Cargo.toml however let p = p.as_ref(); // Attempt to canonicalize the path, which might not work if the // user is attempting to add a path to filter from another // filesystem or similar let p = p.canonicalize().unwrap_or_else(|_| p.to_owned()); if !p.ends_with("Cargo.toml") { p.join("Cargo.toml") } else { p } })); self } /// By default, cargo resolves all target specific dependencies. Optionally, /// you can use the `--filter-platform` option on `cargo metadata` to /// resolve only dependencies that match the specified target, but it can /// only do this for one platlform. /// /// By using this method, you can specify one or more targets by their /// triple, as well as any /// [`target_features`](https://doc.rust-lang.org/reference/attributes/codegen.html#the-target_feature-attribute) /// that you /// [promise](https://doc.rust-lang.org/reference/behavior-considered-undefined.html) /// are enabled for that target to filter dependencies by. If any of the /// specified targets matches a target specific dependency, it will be /// included in the graph. /// /// When specifying a target triple, only builtin targets of rustc /// (as of 1.40) can be used to evaluate `cfg()` expressions. If the triple /// is not recognized, it will only be evaluated against /// `[target.<triple-or-json>.<|build-|dev->dependencies]`. /// /// ``` /// # use krates::{Builder, DepKind, Scope}; /// let targets = [ /// // the big 3 /// "x86_64-unknown-linux-gnu", /// "x86_64-pc-windows-msvc", /// "x86_64-apple-darwin", /// // and musl! /// "x86_64-unknown-linux-musl", /// // and wasm (with the fancy atomics feature!) /// "wasm32-unknown-unknown", /// ]; /// /// Builder::new().include_targets(targets.into_iter().map(|triple| { /// if triple.starts_with("wasm32") { /// (*triple, vec!["atomics".to_owned()]) /// } else { /// (*triple, vec![]) /// } /// })); /// ``` pub fn include_targets<S: AsRef<str>>( &mut self, targets: impl IntoIterator<Item = (S, Vec<String>)>, ) -> &mut Self { self.target_filters .extend(targets.into_iter().map(|(triple, features)| { match cfg_expr::targets::get_target_by_triple(triple.as_ref()) { Some(ti) => TargetFilter::Known(ti, features), None => TargetFilter::Unknown(triple.as_ref().to_owned(), features), } })); self } /// Builds a `Krates` graph using metadata that be retrieved via the /// specified metadata command. If `on_filter` is specified, it will be /// called with each package that was filtered from the graph, if any. /// /// This method will fail if the metadata command fails for some reason, or /// if the command specifies `--no-deps` which means there will be no /// resolution graph to build our graph from. /// /// ```no_run /// # use krates::cm::Package; /// let mut mdc = krates::Cmd::new(); /// mdc.manifest_path("path/to/Cargo.toml"); /// /// if /*no_default_features*/ true { /// mdc.no_default_features(); /// } /// /// if /*cfg.all_features*/ false { /// mdc.all_features(); /// } /// /// mdc.features( /// ["cool-feature", "cooler-feature", "coolest-feature"] /// .iter() /// .map(|s| s.to_string()), /// ); /// /// let mut builder = krates::Builder::new(); /// /// if /*cfg.ignore_build_dependencies*/ false { /// builder.ignore_kind(krates::DepKind::Build, krates::Scope::All); /// } /// /// if /*cfg.ignore_dev_dependencies*/ true { /// builder.ignore_kind(krates::DepKind::Dev, krates::Scope::All); /// } /// /// let graph: krates::Krates = builder.build( /// mdc, /// |filtered: Package| match filtered.source { /// Some(src) => { /// if src.is_crates_io() { /// println!("filtered {} {}", filtered.name, filtered.version); /// } else { /// println!("filtered {} {} {}", filtered.name, filtered.version, src); /// } /// } /// None => println!("filtered crate {} {}", filtered.name, filtered.version), /// }, /// ).unwrap(); /// ``` pub fn build<N, E, F>( self, cmd: impl Into<cm::MetadataCommand>, on_filter: F, ) -> Result<Krates<N, E>, Error> where N: From<cargo_metadata::Package>, E: From<Edge>, F: OnFilter, { let metadata = cmd.into().exec()?; self.build_with_metadata(metadata, on_filter) } /// Builds a `Krates` graph using the specified metadata. If `on_filter` is /// specified, it will be called with each package that was filtered from /// the graph, if any. /// /// The metadata **must** have resolved dependencies for the graph to be /// built, so not having it is the only way this method will fail. /// /// ```no_run /// # use krates::{Krates, Builder, DepKind, Scope, cm::Package}; /// let contents = std::fs::read_to_string("metadata.json") /// .map_err(|e| format!("failed to load metadata file: {}", e)).unwrap(); /// /// let md: krates::cm::Metadata = serde_json::from_str(&contents) /// .map_err(|e| format!("failed to deserialize metadata: {}", e)).unwrap(); /// /// let krates: Krates = Builder::new().build_with_metadata( /// md, /// |pkg: Package| println!("filtered {}", pkg.id) /// ).unwrap(); /// /// println!("found {} unique crates", krates.len()); /// ``` pub fn build_with_metadata<N, E, F>( self, md: cargo_metadata::Metadata, mut on_filter: F, ) -> Result<Krates<N, E>, Error> where N: From<cargo_metadata::Package>, E: From<Edge>, F: OnFilter, { let resolved = md.resolve.ok_or_else(|| Error::NoResolveGraph)?; let mut packages = md.packages; packages.sort_by(|a, b| a.id.cmp(&b.id)); let mut workspace_members = md.workspace_members; workspace_members.sort(); let mut edge_map = HashMap::new(); let mut pid_stack = Vec::with_capacity(workspace_members.len()); // Only include workspaces members the user wants if they have specified // any, this is to take into account scenarios where you have a large // workspace, but only want to get the crates used by a subset of the // workspace if self.workspace_filters.is_empty() { // If the resolve graph specifies a root, it means the user // specified a particular crate in a workspace, so we'll only use // that single root for the entire graph rather than a root for each // workspace member crate if !self.workspace { if let Some(ref root) = resolved.root { pid_stack.push(root); } } if pid_stack.is_empty() { pid_stack.extend(workspace_members.iter()); } } else { // If the filters only contain 1 path, and it is the path to a // workspace toml, then we disregard the filters if self.workspace_filters.len() == 1 && Some(md.workspace_root.as_ref()) == self.workspace_filters[0].parent() { pid_stack.extend(workspace_members.iter()); } else { for wm in &workspace_members { if let Ok(i) = packages.binary_search_by(|pkg| pkg.id.cmp(wm)) { if self .workspace_filters .iter() .any(|wf| wf == &packages[i].manifest_path) { pid_stack.push(wm); } } } } } let exclude = self.exclude; let include_all_targets = self.target_filters.is_empty(); let ignore_kinds = self.ignore_kinds; let targets = self.target_filters; #[derive(Debug)] struct DepKindInfo { kind: DepKind, cfg: Option<String>, } #[derive(Debug)] // We use our resolution nodes because cargo_metadata uses // non-exhaustive everywhere :p struct NodeDep { //name: String, pkg: Kid, dep_kinds: Vec<DepKindInfo>, } #[derive(Debug)] struct Node { id: Kid, deps: Vec<NodeDep>, // We don't use this for now, but maybe we should expose it on each // crate? // features: Vec<String>, } let mut nodes: Vec<_> = resolved .nodes .into_iter() .map(|rn| { let krate = &packages[packages.binary_search_by(|k| k.id.cmp(&rn.id)).unwrap()]; let deps = rn .deps .into_iter() .map(|dn| { // We can't rely on the user using cargo from 1.41+ at least for a little bit, // so use a fallback for now. Maybe eventually can do a breaking change to require // 1.41 so this is nicer let dep_kinds = if dn.dep_kinds.is_empty() { let name = &dn.pkg.repr[..dn.pkg.repr.find(' ').unwrap()]; krate .dependencies .iter() .filter_map(|dep| { if name == dep.name { Some(DepKindInfo { kind: dep.kind.into(), cfg: dep.target.as_ref().map(|t| format!("{}", t)), }) } else { None } }) .collect() } else { dn.dep_kinds .into_iter() .map(|dk| DepKindInfo { kind: dk.kind.into(), cfg: dk.target.map(|t| format!("{}", t)), }) .collect() }; NodeDep { //name: dn.name, pkg: dn.pkg, dep_kinds, } }) .collect(); Node { id: rn.id, deps } }) .collect(); nodes.sort_by(|a, b| a.id.cmp(&b.id)); while let Some(pid) = pid_stack.pop() { let is_in_workspace = workspace_members.binary_search(&pid).is_ok(); let krate_index = nodes.binary_search_by(|n| n.id.cmp(&pid)).unwrap(); let rnode = &nodes[krate_index]; let krate = &packages[krate_index]; if exclude.iter().any(|exc| exc.matches(&krate)) { continue; } debug_assert!(rnode.id == krate.id); // Though each unique dependency can only be resolved once, it's possible // for the crate to list the same dependency multiple times, with different // dependency kinds, or different target configurations, so each one gets its // own edge let edges: Vec<_> = rnode .deps .iter() .flat_map(|rdep| { let targets = &targets; rdep.dep_kinds.iter().filter_map(move |dk| { let mask = match dk.kind { DepKind::Normal => 0x1, DepKind::Dev => 0x8, DepKind::Build => 0x40, }; let mask = mask | mask << if is_in_workspace { 1 } else { 2 }; if mask & ignore_kinds == mask { return None; } match &dk.cfg { None => Some(( Edge { kind: dk.kind, cfg: None, }, &rdep.pkg, )), Some(cfg) => { if include_all_targets { return Some(( Edge { kind: dk.kind, cfg: Some(cfg.to_owned()), }, &rdep.pkg, )); } let matched = if cfg.starts_with("cfg(") { match cfg_expr::Expression::parse(&cfg) { Ok(expr) => { // We only need to focus on target predicates because they are // the only type of predicate allowed by cargo at the moment // While it might be nicer to evaluate all the targets for each predicate // it would lead to weird situations where an expression could evaluate to true // (or false) with a combination of platform, that would otherwise by impossible, // eg cfg(all(windows, target_env = "musl")) could evaluate to true targets.iter().any(|target| { expr.eval(|pred| match pred { cfg_expr::expr::Predicate::Target(tp) => { if let TargetFilter::Known(ti, _) = target { tp.matches(ti) } else { false } } cfg_expr::expr::Predicate::TargetFeature( feat, ) => { let features = match target { TargetFilter::Known(_, f) => f, TargetFilter::Unknown(_, f) => f, }; // TODO: target_features are extremely rare in cargo.toml // files, it might be a good idea to inform the user of this // somehow, filteredare unsure why a particular dependency // is being filtered features.iter().any(|f| f == feat) } // We *could* warn here about an invalid expression, but // presumably cargo will be responsible for that so don't bother _ => false, }) }) } Err(_pe) => { // TODO: maybe log a warning if we somehow fail to parse the cfg? true } } } else { targets.iter().any(|target| match target { TargetFilter::Known(ti, _) => ti.triple == cfg, TargetFilter::Unknown(t, _) => t.as_str() == cfg, }) }; if matched { Some(( Edge { kind: dk.kind, cfg: Some(cfg.to_owned()), }, &rdep.pkg, )) } else { None } } } }) }) .collect(); for pid in edges.iter().map(|(_, pid)| pid) { if !edge_map.contains_key(pid) { pid_stack.push(pid); } } edge_map.insert(pid, edges); } // Sanity check, it's possible the user could exclude all of the // possible workspace root nodes leaving themselves with an empty graph, // which isn't much use to anyone if edge_map.is_empty() { return Err(Error::NoRootKrates); } let mut graph = petgraph::Graph::<crate::Node<N>, E>::new(); graph.reserve_nodes(edge_map.len()); let mut edge_count = 0; // Preserve the ordering of the krates when inserting them into the graph for krate in packages { if let Some(edges) = edge_map.get(&krate.id) { let id = krate.id.clone(); let krate = crate::Node { id, krate: N::from(krate), }; graph.add_node(krate); edge_count += edges.len(); } else { on_filter.filtered(krate); } } graph.reserve_edges(edge_count); let get = |graph: &petgraph::Graph<crate::Node<N>, E>, id: &Kid| -> Option<crate::NodeId> { graph .raw_nodes() .binary_search_by(|n| n.weight.id.cmp(id)) .ok() .map(crate::NodeId::new) }; // Keep edges ordered as well for srcind in 0..graph.node_count() { let srcid = crate::NodeId::new(srcind); if let Some(edges) = edge_map.remove(&graph[srcid].id) { for (dep, tid) in edges { // We might not have a target in the case of explicitly excluded // packages if let Some(target) = get(&graph, &tid) { graph.add_edge(srcid, target, E::from(dep)); } } } } Ok(Krates { graph, workspace_members, lock_file: md.workspace_root.join("Cargo.lock"), }) } }