fix(init): allow alternate Iris binary

root/init.go

@@ -35,7 +35,7 @@ fi
 # prompt to complete, and exec'ing here would seize the tty from the real iris
 if [[ -o interactive ]] && [ -t 0 ] && [ -z "$IRIS_PID" ] && [ -z "$IRIS_RESCUE" ]; then
     export IRIS_ACTIVE_SHELL="zsh"
-    exec iris
+    exec "${IRIS_BIN:-iris}"
 fi
 
 # Iris Autocomplete Hook
@@ -80,7 +80,7 @@ fi
 # prompt to complete, and exec'ing here would seize the tty from the real iris
 if [[ $- == *i* ]] && [ -t 0 ] && [ -z "$IRIS_PID" ] && [ -z "$IRIS_RESCUE" ]; then
     export IRIS_ACTIVE_SHELL="bash"
-    exec iris
+    exec "${IRIS_BIN:-iris}"
 fi
 
 # Iris Autocomplete Hook
@@ -115,8 +115,12 @@ end
 
 if status is-interactive; and not set -q IRIS_PID; and not set -q IRIS_RESCUE
     set -gx IRIS_ACTIVE_SHELL "fish"
+    if set -q IRIS_BIN
+        exec "$IRIS_BIN"
+    else
         exec iris
     end
+end
 
 # Iris Autocomplete Hook
 if set -q IRIS_PID; and set -q IRIS_FD

root/init_test.go

@@ -41,7 +41,11 @@ func TestInitAutostartRequiresInteractiveShell(t *testing.T) {
 		t.Run(shell, func(t *testing.T) {
 			script := captureInitScript(t, shell)
 
-			head, _, found := strings.Cut(script, "exec iris")
+			autostart := `exec "${IRIS_BIN:-iris}"`
+			if shell == "fish" {
+				autostart = `exec "$IRIS_BIN"`
+			}
+			head, _, found := strings.Cut(script, autostart)
 			if !found {
 				t.Fatalf("%s init script has no autostart", shell)
 			}
@@ -57,3 +61,14 @@ func TestInitAutostartRequiresInteractiveShell(t *testing.T) {
 		})
 	}
 }
+
+func TestInitAutostartSupportsBinaryOverride(t *testing.T) {
+	for _, shell := range []string{"zsh", "bash", "fish"} {
+		t.Run(shell, func(t *testing.T) {
+			script := captureInitScript(t, shell)
+			if !strings.Contains(script, "IRIS_BIN") {
+				t.Fatalf("%s init script does not support IRIS_BIN", shell)
+			}
+		})
+	}
+}