feat: Warn --package will be ignore if it comes up with --workspace

src/bin/cargo/commands/add.rs

@@ -185,7 +185,7 @@ pub fn exec(gctx: &mut GlobalContext, args: &ArgMatches) -> CliResult {
         print_available_packages(&ws)?;
     }
 
-    let packages = args.packages_from_flags()?;
+    let packages = args.packages_from_flags(gctx, false)?;
     let packages = packages.get_packages(&ws)?;
     let spec = match packages.len() {
         0 => {

src/bin/cargo/commands/package.rs

@@ -69,7 +69,7 @@ pub fn exec(gctx: &mut GlobalContext, args: &ArgMatches) -> CliResult {
         )
         .into());
     }
-    let specs = args.packages_from_flags()?;
+    let specs = args.packages_from_flags(gctx, true)?;
 
     ops::package(
         &ws,

src/bin/cargo/commands/publish.rs

@@ -72,7 +72,7 @@ pub fn exec(gctx: &mut GlobalContext, args: &ArgMatches) -> CliResult {
             reg_or_index,
             verify: !args.flag("no-verify"),
             allow_dirty: args.flag("allow-dirty"),
-            to_publish: args.packages_from_flags()?,
+            to_publish: args.packages_from_flags(gctx, true)?,
             targets: args.targets()?,
             jobs: args.jobs()?,
             keep_going: args.keep_going(),

src/bin/cargo/commands/remove.rs

@@ -66,7 +66,7 @@ pub fn exec(gctx: &mut GlobalContext, args: &ArgMatches) -> CliResult {
         print_available_packages(&workspace)?;
     }
 
-    let packages = args.packages_from_flags()?;
+    let packages = args.packages_from_flags(gctx, false)?;
     let packages = packages.get_packages(&workspace)?;
     let spec = match packages.len() {
         0 => {

src/bin/cargo/commands/tree.rs

@@ -168,7 +168,7 @@ pub fn exec(gctx: &mut GlobalContext, args: &ArgMatches) -> CliResult {
         .transpose()?
         .unwrap_or(DisplayDepth::MaxDisplayDepth(u32::MAX));
 
-    let packages = args.packages_from_flags()?;
+    let packages = args.packages_from_flags(gctx, true)?;
     let mut invert = args
         .get_many::<String>("invert")
         .map_or_else(|| Vec::new(), |is| is.map(|s| s.to_string()).collect());

src/cargo/util/command_prelude.rs

@@ -672,13 +672,23 @@ Run `{cmd}` to see possible targets."
         Ok(InternedString::new(name))
     }
 
-    fn packages_from_flags(&self) -> CargoResult<Packages> {
-        Packages::from_flags(
+    fn packages_from_flags(
+        &self,
+        gctx: &GlobalContext,
+        ignore_package: bool,
+    ) -> CargoResult<Packages> {
+        let spec = Packages::from_flags(
             // TODO Integrate into 'workspace'
             self.flag("workspace") || self.flag("all"),
             self._values_of("exclude"),
             self._values_of("package"),
-        )
+        )?;
+        if ignore_package && matches!(spec, Packages::All) && !self._values_of("package").is_empty()
+        {
+            gctx.shell()
+                .warn("ignoring `--package` as the `--workspace` or `--all` flag is set")?;
+        }
+        Ok(spec)
     }
 
     fn compile_options(
@@ -688,7 +698,7 @@ Run `{cmd}` to see possible targets."
         workspace: Option<&Workspace<'_>>,
         profile_checking: ProfileChecking,
     ) -> CargoResult<CompileOptions> {
-        let spec = self.packages_from_flags()?;
+        let spec = self.packages_from_flags(gctx, true)?;
         let mut message_format = None;
         let default_json = MessageFormat::Json {
             short: false,

tests/testsuite/workspaces.rs

@@ -2658,22 +2658,25 @@ fn warn_package_togother_with_workspace() {
     // baz is present in the workspace and it is a real existing package.
     p.cargo("check --package baz --workspace")
         .with_stderr_data(str![[r#"
-[CHECKING] foo v0.1.0 ([ROOT]/foo)
+[WARNING] ignoring `--package` as the `--workspace` or `--all` flag is set
 [CHECKING] baz v0.1.0 ([ROOT]/foo/baz)
+[CHECKING] foo v0.1.0 ([ROOT]/foo)
 [FINISHED] `dev` profile [unoptimized + debuginfo] target(s) in [ELAPSED]s
 
 "#]])
         .run();
 
     p.cargo("check --package nonexistence --workspace")
         .with_stderr_data(str![[r#"
+[WARNING] ignoring `--package` as the `--workspace` or `--all` flag is set
 [FINISHED] `dev` profile [unoptimized + debuginfo] target(s) in [ELAPSED]s
 
 "#]])
         .run();
 
     p.cargo("package --package nonexistence --workspace")
         .with_stderr_data(str![[r#"
+[WARNING] ignoring `--package` as the `--workspace` or `--all` flag is set
 [WARNING] manifest has no description, license, license-file, documentation, homepage or repository.
 See https://doc.rust-lang.org/cargo/reference/manifest.html#package-metadata for more info.
 [PACKAGING] baz v0.1.0 ([ROOT]/foo/baz)
@@ -2694,6 +2697,7 @@ See https://doc.rust-lang.org/cargo/reference/manifest.html#package-metadata for
 
     p.cargo("publish --dry-run --package nonexistence -Zpackage-workspace --workspace")
         .with_stderr_data(str![[r#"
+[WARNING] ignoring `--package` as the `--workspace` or `--all` flag is set
 [UPDATING] crates.io index
 [WARNING] crate [email protected] already exists on crates.io index
 [WARNING] manifest has no description, license, license-file, documentation, homepage or repository.
@@ -2720,6 +2724,9 @@ See https://doc.rust-lang.org/cargo/reference/manifest.html#package-metadata for
         .run();
 
     p.cargo("tree --package nonexistence  --workspace")
-        .with_stderr_data(str![])
+        .with_stderr_data(str![[r#"
+[WARNING] ignoring `--package` as the `--workspace` or `--all` flag is set
+
+"#]])
         .run();
 }