Add a --bin argument to mirror cargo install --bin.

crates/bin/src/args.rs

@@ -93,6 +93,20 @@ pub struct Args {
     )]
     pub(crate) targets: Option<Vec<String>>,
 
+    /// Install only the specified binaries.
+    ///
+    /// This mirrors the equivalent argument in `cargo install --bin`.
+    ///
+    /// If omitted, all binaries are installed.
+    #[clap(
+        help_heading = "Package selection",
+        long,
+        value_name = "BINARY",
+        num_args = 1..,
+        action = clap::ArgAction::Append
+    )]
+    pub(crate) bin: Option<Vec<String>>,
+
     /// Override Cargo.toml package manifest path.
     ///
     /// This skips searching crates.io for a manifest and uses the specified path directly, useful

crates/bin/src/entry.rs

@@ -157,6 +157,7 @@ pub fn install_crates(
         desired_targets,
         resolvers,
         cargo_install_fallback,
+        bins: args.bin,
 
         temp_dir: temp_dir.path().to_owned(),
         install_path,

crates/binstalk/src/ops.rs

@@ -44,6 +44,7 @@ pub struct Options {
     pub desired_targets: DesiredTargets,
     pub resolvers: Vec<Resolver>,
     pub cargo_install_fallback: bool,
+    pub bins: Option<Vec<String>>,
 
     pub temp_dir: PathBuf,
     pub install_path: PathBuf,

crates/binstalk/src/ops/resolve/resolution.rs

@@ -87,11 +87,16 @@ impl ResolutionFetch {
             current_version: self.new_version,
             source: self.source,
             target: self.fetcher.target().to_compact_string(),
-            bins: self
+            bins: opts
-                .bin_files
+                .bins
-                .into_iter()
+                .as_ref()
-                .map(|bin| bin.base_name)
+                .map(|bins| bins.iter().cloned().map(Into::into).collect())
-                .collect(),
+                .unwrap_or_else(|| {
+                    self.bin_files
+                        .into_iter()
+                        .map(|bin| bin.base_name)
+                        .collect()
+                }),
         })
     }
 

e2e-tests/specific-binaries.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+set -euxo pipefail
+
+unset CARGO_INSTALL_ROOT
+
+CARGO_HOME=$(mktemp -d 2>/dev/null || mktemp -d -t 'cargo-home')
+export CARGO_HOME
+export PATH="$CARGO_HOME/bin:$PATH"
+
+# Install a specific binary (e.g., ripgrep)
+"./$1" binstall --no-confirm ripgrep --bin rg
+
+# Verify that the binary was installed and is executable
+if ! command -v rg >/dev/null 2>&1; then
+  echo "rg was not installed"
+  exit 1
+fi
+
+# Run the binary to check it works
+rg --version

justfile

@@ -224,6 +224,7 @@ e2e-test-signing: (e2e-test "signing")
 e2e-test-continue-on-failure: (e2e-test "continue-on-failure")
 e2e-test-private-github-repo: (e2e-test "private-github-repo")
 e2e-test-self-install: (e2e-test "self-install")
+e2e-test-specific-binaries: (e2e-test "specific-binaries")
 
 # WinTLS (Windows in CI) does not have TLS 1.3 support
 [windows]
@@ -232,7 +233,7 @@ e2e-test-tls: (e2e-test "tls" "1.2")
 [macos]
 e2e-test-tls: (e2e-test "tls" "1.2") (e2e-test "tls" "1.3")
 
-e2e-tests: e2e-test-live e2e-test-manifest-path e2e-test-git e2e-test-other-repos e2e-test-strategies e2e-test-version-syntax e2e-test-upgrade e2e-test-tls e2e-test-self-upgrade-no-symlink e2e-test-uninstall e2e-test-subcrate e2e-test-no-track e2e-test-registries e2e-test-signing e2e-test-continue-on-failure e2e-test-private-github-repo e2e-test-self-install
+e2e-tests: e2e-test-live e2e-test-manifest-path e2e-test-git e2e-test-other-repos e2e-test-strategies e2e-test-version-syntax e2e-test-upgrade e2e-test-tls e2e-test-self-upgrade-no-symlink e2e-test-uninstall e2e-test-subcrate e2e-test-no-track e2e-test-registries e2e-test-signing e2e-test-continue-on-failure e2e-test-private-github-repo e2e-test-self-install e2e-test-specific-binaries
 
 unit-tests: print-env
     cargo test --no-run --target {{target}}