Add an --ignore-yanked option

src/bin/cargo/cli.rs

@@ -153,6 +153,7 @@ fn execute_subcommand(config: &mut Config, args: &ArgMatches<'_>) -> CliResult {
         &args.value_of("color").map(|s| s.to_string()),
         args.is_present("frozen"),
         args.is_present("locked"),
+        args.is_present("ignore-yanked"),
         arg_target_dir,
         &args
             .values_of_lossy("unstable-features")
@@ -229,6 +230,7 @@ See 'cargo help <command>' for more information on a specific command.\n",
         )
         .arg(opt("frozen", "Require Cargo.lock and cache are up to date").global(true))
         .arg(opt("locked", "Require Cargo.lock is up to date").global(true))
+        .arg(opt("ignore-yanked", "Treat yanked crates as if they weren't yanked").global(true))
         .arg(
             Arg::with_name("unstable-features")
                 .help("Unstable (nightly-only) flags to Cargo, see 'cargo -Z help' for details")

src/cargo/sources/registry/index.rs

@@ -277,10 +277,11 @@ impl<'cfg> RegistryIndex<'cfg> {
     ) -> CargoResult<()> {
         let source_id = self.source_id;
         let name = dep.package_name().as_str();
+        let ignore_yanked = self.config.ignore_yanked();
         let summaries = self.summaries(name, load)?;
         let summaries = summaries
             .iter()
-            .filter(|&&(_, yanked)| dep.source_id().precise().is_some() || !yanked)
+            .filter(|&&(_, yanked)| dep.source_id().precise().is_some() || !yanked || ignore_yanked)
             .map(|s| s.0.clone());
 
         // Handle `cargo update --precise` here. If specified, our own source

src/cargo/util/config.rs

@@ -57,6 +57,8 @@ pub struct Config {
     frozen: bool,
     /// `locked` is set if we should not update lock files
     locked: bool,
+    /// Treat yanked crates as if they weren't yanked
+    ignore_yanked: bool,
     /// A global static IPC control mechanism (used for managing parallel builds)
     jobserver: Option<jobserver::Client>,
     /// Cli flags of the form "-Z something"
@@ -115,6 +117,7 @@ impl Config {
             extra_verbose: false,
             frozen: false,
             locked: false,
+            ignore_yanked: false,
             jobserver: unsafe {
                 if GLOBAL_JOBSERVER.is_null() {
                     None
@@ -548,6 +551,7 @@ impl Config {
         color: &Option<String>,
         frozen: bool,
         locked: bool,
+        ignore_yanked: bool,
         target_dir: &Option<PathBuf>,
         unstable_flags: &[String],
     ) -> CargoResult<()> {
@@ -592,6 +596,7 @@ impl Config {
         self.extra_verbose = extra_verbose;
         self.frozen = frozen;
         self.locked = locked;
+        self.ignore_yanked = ignore_yanked;
         self.target_dir = cli_target_dir;
         self.cli_flags.parse(unstable_flags)?;
 
@@ -618,6 +623,10 @@ impl Config {
         !self.frozen && !self.locked
     }
 
+    pub fn ignore_yanked(&self) -> bool {
+        self.ignore_yanked
+    }
+
     /// Loads configuration from the filesystem
     pub fn load_values(&self) -> CargoResult<HashMap<String, ConfigValue>> {
         self.load_values_from(&self.cwd)