Warn and re-confirm when using --version 1.2.3 and --version =1.2.3 was probably meant

Cargo.lock

@@ -134,6 +134,7 @@ dependencies = [
  "env_logger",
  "flate2",
  "log",
+ "regex",
  "reqwest",
  "semver",
  "serde",
@@ -1186,9 +1187,9 @@ dependencies = [
 
 [[package]]
 name = "regex"
-version = "1.5.4"
+version = "1.5.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d07a8629359eb56f1e2fb1652bb04212c072a87ba68546a04065d525673ac461"
+checksum = "1a11647b6b25ff05a515cb92c365cec08801e83423a235b51e231e1808747286"
 dependencies = [
  "aho-corasick",
  "memchr",

Cargo.toml

@@ -42,6 +42,7 @@ xz2 = "0.1.6"
 zip = "0.5.13"
 async-trait = "0.1.52"
 url = "2.2.2"
+regex = "1.5.5"
 
 [dev-dependencies]
 env_logger = "0.9.0"

src/bins.rs

@@ -1,4 +1,4 @@
-use std::path::{PathBuf, Path};
+use std::path::{Path, PathBuf};
 
 use cargo_toml::Product;
 use log::debug;
@@ -118,9 +118,13 @@ impl BinFile {
 
     fn link_dest(&self) -> &Path {
         #[cfg(target_family = "unix")]
-        { Path::new(self.dest.file_name().unwrap()) }
+        {
+            Path::new(self.dest.file_name().unwrap())
+        }
         #[cfg(target_family = "windows")]
-        { &self.dest }
+        {
+            &self.dest
+        }
     }
 }
 

src/main.rs

@@ -105,6 +105,19 @@ async fn main() -> Result<(), anyhow::Error> {
     let manifest = load_manifest_path(manifest_path.join("Cargo.toml"))?;
     let package = manifest.package.unwrap();
 
+    let plain_version_rx = regex::Regex::new(r"^\d+[.]\d+[.]\d+(-\w+([.]\d+)?)?$").unwrap();
+    if plain_version_rx.is_match(&opts.version) && package.version != opts.version {
+        warn!(
+            "You specified `--version {o}` but the package resolved that to '{p}', use `={o}` if you want an exact match",
+            o=opts.version, p=package.version
+        );
+
+        if !opts.no_confirm && !opts.dry_run && !confirm()? {
+            warn!("Installation cancelled");
+            return Ok(());
+        }
+    }
+
     let (mut meta, binaries) = (
         package
             .metadata