clean: add --include-cache option

This patch adds the `--include-cache` flag to `cargo clean`, which
allows the command to also remove related artifacts from `CARGO_HOME`
such as downloaded `.crate` files in `~/.cargo/cache/` and extracted
source directories in `~/.cargo/src/`.

Note that this feature is not intended to replace the `cargo-cache`
command which does smart cache management. Instead, this command simply
blows away whatever it's asked to delete with no smarts whatsoever.

Fixes rust-lang#3289.

src/bin/cargo/commands/clean.rs

@@ -7,6 +7,10 @@ pub fn cli() -> App {
     subcommand("clean")
         .about("Remove artifacts that cargo has generated in the past")
         .arg(opt("quiet", "No output printed to stdout").short("q"))
+        .arg(opt(
+            "include-cache",
+            "Whether to clean Cargo's cache directories",
+        ))
         .arg_package_spec_simple("Package to clean artifacts for")
         .arg_manifest_path()
         .arg_target_triple("Target triple to clean output for")
@@ -31,6 +35,7 @@ pub fn exec(config: &mut Config, args: &ArgMatches<'_>) -> CliResult {
         requested_profile: args.get_profile_name(config, "dev", ProfileChecking::Custom)?,
         profile_specified: args.is_present("profile") || args.is_present("release"),
         doc: args.is_present("doc"),
+        include_cache: args.is_present("include-cache"),
     };
     ops::clean(&ws, &opts)?;
     Ok(())

src/cargo/core/source/mod.rs

@@ -3,7 +3,7 @@ use std::fmt;
 
 use crate::core::package::PackageSet;
 use crate::core::{Dependency, Package, PackageId, Summary};
-use crate::util::{CargoResult, Config};
+use crate::util::{CargoResult, Config, Filesystem};
 
 mod source_id;
 
@@ -101,6 +101,10 @@ pub trait Source {
     /// Query if a package is yanked. Only registry sources can mark packages
     /// as yanked. This ignores the yanked whitelist.
     fn is_yanked(&mut self, _pkg: PackageId) -> CargoResult<bool>;
+
+    fn source_cache(&mut self) -> Option<&mut Filesystem>;
+
+    fn dot_crate_cache(&mut self) -> Option<&mut Filesystem>;
 }
 
 pub enum MaybePackage {
@@ -178,6 +182,14 @@ impl<'a, T: Source + ?Sized + 'a> Source for Box<T> {
     fn is_yanked(&mut self, pkg: PackageId) -> CargoResult<bool> {
         (**self).is_yanked(pkg)
     }
+
+    fn source_cache(&mut self) -> Option<&mut Filesystem> {
+        (**self).source_cache()
+    }
+
+    fn dot_crate_cache(&mut self) -> Option<&mut Filesystem> {
+        (**self).dot_crate_cache()
+    }
 }
 
 impl<'a, T: Source + ?Sized + 'a> Source for &'a mut T {
@@ -240,6 +252,14 @@ impl<'a, T: Source + ?Sized + 'a> Source for &'a mut T {
     fn is_yanked(&mut self, pkg: PackageId) -> CargoResult<bool> {
         (**self).is_yanked(pkg)
     }
+
+    fn source_cache(&mut self) -> Option<&mut Filesystem> {
+        (**self).source_cache()
+    }
+
+    fn dot_crate_cache(&mut self) -> Option<&mut Filesystem> {
+        (**self).dot_crate_cache()
+    }
 }
 
 /// A `HashMap` of `SourceId` -> `Box<Source>`.

src/cargo/ops/cargo_clean.rs

@@ -2,13 +2,15 @@ use crate::core::compiler::{CompileKind, CompileMode, Layout, RustcTargetData};
 use crate::core::profiles::Profiles;
 use crate::core::{PackageIdSpec, TargetKind, Workspace};
 use crate::ops;
+use crate::sources::SourceConfigMap;
 use crate::util::errors::CargoResult;
 use crate::util::interning::InternedString;
 use crate::util::lev_distance;
 use crate::util::Config;
 
 use anyhow::Context as _;
 use cargo_util::paths;
+use std::collections::{hash_map, HashMap};
 use std::fs;
 use std::path::Path;
 
@@ -24,6 +26,8 @@ pub struct CleanOptions<'a> {
     pub requested_profile: InternedString,
     /// Whether to just clean the doc directory
     pub doc: bool,
+    /// Whether to also clean the package cache
+    pub include_cache: bool,
 }
 
 /// Cleans the package's build artifacts.
@@ -53,6 +57,12 @@ pub fn clean(ws: &Workspace<'_>, opts: &CleanOptions<'_>) -> CargoResult<()> {
     // Note that we don't bother grabbing a lock here as we're just going to
     // blow it all away anyway.
     if opts.spec.is_empty() {
+        if opts.include_cache {
+            // We also need to remove src/ and cache/ from CARGO_HOME.
+            rm_rf(&config.registry_cache_path().into_path_unlocked(), config)?;
+            rm_rf(&config.registry_source_path().into_path_unlocked(), config)?;
+        }
+
         return rm_rf(&target_dir.into_path_unlocked(), config);
     }
 
@@ -133,6 +143,16 @@ pub fn clean(ws: &Workspace<'_>, opts: &CleanOptions<'_>) -> CargoResult<()> {
     }
     let packages = pkg_set.get_many(pkg_ids)?;
 
+    let mut registries = HashMap::new();
+    let (_pc_lock, sources) = if opts.include_cache {
+        (
+            Some(config.acquire_package_cache_lock()?),
+            Some(SourceConfigMap::new(config)?),
+        )
+    } else {
+        (None, None)
+    };
+
     for pkg in packages {
         let pkg_dir = format!("{}-*", pkg.name());
 
@@ -141,6 +161,30 @@ pub fn clean(ws: &Workspace<'_>, opts: &CleanOptions<'_>) -> CargoResult<()> {
             rm_rf_glob(&layout.fingerprint().join(&pkg_dir), config)?;
         }
 
+        if let Some(sources) = &sources {
+            let source_id = pkg.package_id().source_id();
+            let registry = match registries.entry(source_id) {
+                hash_map::Entry::Occupied(o) => o.into_mut(),
+                hash_map::Entry::Vacant(v) => {
+                    let reg = sources.load(source_id, &Default::default())?;
+                    v.insert(reg)
+                }
+            };
+
+            // The as_path_unlocked are okay since we've acquired the package cache lock.
+            if let Some(src_path) = registry.source_cache() {
+                rm_rf_glob(&src_path.as_path_unlocked().join(&pkg_dir), config)?;
+            }
+            if let Some(cache_path) = registry.dot_crate_cache() {
+                rm_rf_glob(
+                    &cache_path
+                        .as_path_unlocked()
+                        .join(&format!("{}.crate", pkg_dir)),
+                    config,
+                )?;
+            }
+        }
+
         for target in pkg.targets() {
             if target.is_custom_build() {
                 // Get both the build_script_build and the output directory.

src/cargo/sources/directory.rs

@@ -6,7 +6,7 @@ use crate::core::source::MaybePackage;
 use crate::core::{Dependency, Package, PackageId, Source, SourceId, Summary};
 use crate::sources::PathSource;
 use crate::util::errors::CargoResult;
-use crate::util::Config;
+use crate::util::{Config, Filesystem};
 
 use anyhow::Context as _;
 use cargo_util::{paths, Sha256};
@@ -205,4 +205,12 @@ impl<'cfg> Source for DirectorySource<'cfg> {
     fn is_yanked(&mut self, _pkg: PackageId) -> CargoResult<bool> {
         Ok(false)
     }
+
+    fn source_cache(&mut self) -> Option<&mut Filesystem> {
+        None
+    }
+
+    fn dot_crate_cache(&mut self) -> Option<&mut Filesystem> {
+        None
+    }
 }

src/cargo/sources/git/source.rs

@@ -5,7 +5,7 @@ use crate::sources::git::utils::GitRemote;
 use crate::sources::PathSource;
 use crate::util::errors::CargoResult;
 use crate::util::hex::short_hash;
-use crate::util::Config;
+use crate::util::{Config, Filesystem};
 use anyhow::Context;
 use log::trace;
 use std::fmt::{self, Debug, Formatter};
@@ -212,6 +212,14 @@ impl<'cfg> Source for GitSource<'cfg> {
     fn is_yanked(&mut self, _pkg: PackageId) -> CargoResult<bool> {
         Ok(false)
     }
+
+    fn source_cache(&mut self) -> Option<&mut Filesystem> {
+        None
+    }
+
+    fn dot_crate_cache(&mut self) -> Option<&mut Filesystem> {
+        None
+    }
 }
 
 #[cfg(test)]

src/cargo/sources/path.rs

@@ -6,7 +6,7 @@ use std::path::{Path, PathBuf};
 use crate::core::source::MaybePackage;
 use crate::core::{Dependency, Package, PackageId, Source, SourceId, Summary};
 use crate::ops;
-use crate::util::{internal, CargoResult, Config};
+use crate::util::{internal, CargoResult, Config, Filesystem};
 use anyhow::Context as _;
 use cargo_util::paths;
 use filetime::FileTime;
@@ -541,4 +541,12 @@ impl<'cfg> Source for PathSource<'cfg> {
     fn is_yanked(&mut self, _pkg: PackageId) -> CargoResult<bool> {
         Ok(false)
     }
+
+    fn source_cache(&mut self) -> Option<&mut Filesystem> {
+        None
+    }
+
+    fn dot_crate_cache(&mut self) -> Option<&mut Filesystem> {
+        None
+    }
 }

src/cargo/sources/registry/local.rs

@@ -120,4 +120,8 @@ impl<'cfg> RegistryData for LocalRegistry<'cfg> {
     ) -> CargoResult<File> {
         panic!("this source doesn't download")
     }
+
+    fn dot_crate_cache(&mut self) -> Option<&mut Filesystem> {
+        None
+    }
 }

src/cargo/sources/registry/mod.rs

@@ -435,6 +435,8 @@ pub trait RegistryData {
     /// (remote=git, local=files).
     fn index_path(&self) -> &Filesystem;
 
+    fn dot_crate_cache(&mut self) -> Option<&mut Filesystem>;
+
     /// Loads the JSON for a specific named package from the index.
     ///
     /// * `root` is the root path to the index.
@@ -790,4 +792,12 @@ impl<'cfg> Source for RegistrySource<'cfg> {
         }
         self.index.is_yanked(pkg, &mut *self.ops)
     }
+
+    fn source_cache(&mut self) -> Option<&mut Filesystem> {
+        Some(&mut self.src_path)
+    }
+
+    fn dot_crate_cache(&mut self) -> Option<&mut Filesystem> {
+        self.ops.dot_crate_cache()
+    }
 }

src/cargo/sources/registry/remote.rs

@@ -329,6 +329,10 @@ impl<'cfg> RegistryData for RemoteRegistry<'cfg> {
         }
         false
     }
+
+    fn dot_crate_cache(&mut self) -> Option<&mut Filesystem> {
+        Some(&mut self.cache_path)
+    }
 }
 
 impl<'cfg> Drop for RemoteRegistry<'cfg> {

src/cargo/sources/replaced.rs

@@ -1,6 +1,7 @@
 use crate::core::source::MaybePackage;
 use crate::core::{Dependency, Package, PackageId, Source, SourceId, Summary};
 use crate::util::errors::CargoResult;
+use crate::util::Filesystem;
 
 use anyhow::Context as _;
 
@@ -127,4 +128,12 @@ impl<'cfg> Source for ReplacedSource<'cfg> {
     fn is_yanked(&mut self, pkg: PackageId) -> CargoResult<bool> {
         self.inner.is_yanked(pkg)
     }
+
+    fn source_cache(&mut self) -> Option<&mut Filesystem> {
+        self.inner.source_cache()
+    }
+
+    fn dot_crate_cache(&mut self) -> Option<&mut Filesystem> {
+        self.inner.dot_crate_cache()
+    }
 }

tests/testsuite/clean.rs

@@ -1,7 +1,9 @@
 //! Tests for the `cargo clean` command.
 
+use cargo::core::SourceId;
+use cargo_test_support::install::cargo_home;
 use cargo_test_support::paths::is_symlink;
-use cargo_test_support::registry::Package;
+use cargo_test_support::registry::{registry_url, Package};
 use cargo_test_support::{basic_bin_manifest, basic_manifest, git, main_file, project, rustc_host};
 use std::env;
 use std::path::Path;
@@ -299,6 +301,89 @@ fn clean_verbose() {
     p.cargo("build").run();
 }
 
+#[cargo_test]
+fn clean_include_cache() {
+    let p = project()
+        .file(
+            "Cargo.toml",
+            r#"
+                [package]
+                name = "foo"
+                version = "0.0.1"
+                authors = []
+
+                [dependencies]
+                bar = "0.1"
+                baz = "0.1"
+            "#,
+        )
+        .file("src/main.rs", "fn main() {}")
+        .build();
+
+    Package::new("bar", "0.1.0").publish();
+    Package::new("baz", "0.1.0").publish();
+
+    p.cargo("build").run();
+
+    let src_cache = cargo_home().join("registry").join("src");
+    let dot_crate_cache = cargo_home().join("registry").join("cache");
+    assert!(src_cache.exists());
+    assert!(dot_crate_cache.exists());
+    p.cargo("clean --include-cache").with_stdout("").run();
+    assert!(!src_cache.exists());
+    assert!(!dot_crate_cache.exists());
+}
+#[cargo_test]
+fn clean_package_include_cache() {
+    let p = project()
+        .file(
+            "Cargo.toml",
+            r#"
+                [package]
+                name = "foo"
+                version = "0.0.1"
+                authors = []
+
+                [dependencies]
+                bar = "0.1"
+                baz = "0.1"
+            "#,
+        )
+        .file("src/main.rs", "fn main() {}")
+        .build();
+
+    Package::new("bar", "0.1.0").publish();
+    Package::new("baz", "0.1.0").publish();
+
+    p.cargo("build").run();
+
+    let id = SourceId::for_registry(&registry_url()).unwrap();
+    let hash = cargo::util::hex::short_hash(&id);
+    let src_cache = cargo_home()
+        .join("registry")
+        .join("src")
+        .join(format!("-{}", hash));
+    let bar_src_cache = src_cache.join(format!("bar-0.1.0"));
+    let baz_src_cache = src_cache.join(format!("baz-0.1.0"));
+    let dot_crate_cache = cargo_home()
+        .join("registry")
+        .join("cache")
+        .join(format!("-{}", hash));
+    let bar_dot_crate_cache = dot_crate_cache.join(format!("bar-0.1.0.crate"));
+    let baz_dot_crate_cache = dot_crate_cache.join(format!("baz-0.1.0.crate"));
+    assert!(bar_src_cache.exists());
+    assert!(baz_src_cache.exists());
+    assert!(bar_dot_crate_cache.exists());
+    assert!(baz_dot_crate_cache.exists());
+    p.cargo("clean --include-cache -p bar")
+        .with_stdout("")
+        .run();
+    assert!(!bar_src_cache.exists());
+    assert!(baz_src_cache.exists());
+    assert!(!bar_dot_crate_cache.exists());
+    assert!(baz_dot_crate_cache.exists());
+}
+
 #[cargo_test]
 fn clean_remove_rlib_rmeta() {
     let p = project()