fix(shim): revert shims directory check that caused hangs on macOS

Reverts cfcb555 which changed shim detection from checking the binary
name to checking if argv[0] exists in the shims directory. This caused
mise to hang on startup for some users because the filesystem check
could block on slow/network filesystems, and could falsely detect mise
itself as a shim.

Fixes #8734

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: jdx

e2e/cli/test_shims_args

@@ -377,9 +377,16 @@ pub static IS_RUNNING_AS_SHIM: Lazy<bool> = Lazy::new(|| {
         return true;
     }
 
-    crate::shims::is_in_shims_dir()
+    let bin_name = *MISE_BIN_NAME;
+    !is_mise_binary(bin_name)
 });
 
+/// Returns true if the given binary name refers to mise itself (not a shim).
+/// Handles "mise", "mise.exe", "mise.bat", "mise.cmd", "mise-doctor", etc.
+pub fn is_mise_binary(bin_name: &str) -> bool {
+    bin_name == "mise" || bin_name.starts_with("mise.") || bin_name.starts_with("mise-")
+}
+
 #[cfg(test)]
 pub static TERM_WIDTH: Lazy<usize> = Lazy::new(|| 80);
 

src/env.rs

@@ -23,10 +23,11 @@ use tokio::task::JoinSet;
 
 // executes as if it was a shim if the command is not "mise", e.g.: "node"
 pub async fn handle_shim() -> Result<()> {
-    if *env::MISE_TOOL_STUB || !*env::IS_RUNNING_AS_SHIM {
+    // TODO: instead, check if bin is in shims dir
+    let bin_name = *env::MISE_BIN_NAME;
+    if env::is_mise_binary(bin_name) || cfg!(test) {
         return Ok(());
     }
-    let bin_name = *env::MISE_BIN_NAME;
     let mut config = Config::get().await?;
     let mut args = env::ARGS.read().unwrap().clone();
     env::PREFER_OFFLINE.store(true, Ordering::Relaxed);
@@ -592,15 +593,3 @@ async fn err_no_version_set(
         Err(eyre!(msg.trim().to_string()))
     }
 }
-
-/// Check if the current process is running as a shim by verifying that a file
-/// with the same name as argv[0] exists in the shims directory.
-/// This is more robust than checking the binary name with `is_mise_binary()`,
-/// since package managers may rename the mise binary (e.g. "mise-2026.3.7")
-/// which would incorrectly match the "mise-" prefix.
-pub fn is_in_shims_dir() -> bool {
-    let bin_name = *env::MISE_BIN_NAME;
-    let shim_path = dirs::SHIMS.join(bin_name);
-    // is_symlink() catches broken symlinks that .exists() would miss
-    shim_path.is_symlink() || shim_path.exists()
-}