fix(cli): error out when migrating from v2 alpha (#13833)

.changes/migrate-alpha-error.md

@@ -0,0 +1,6 @@
+---
+"@tauri-apps/cli": patch:bug
+"tauri-cli": patch:bug
+---
+
+Fail with an error when trying to migrate from v2 alpha

.changes/v2-beta-to-stable.md

@@ -0,0 +1,6 @@
+---
+"@tauri-apps/cli": patch:bug
+"tauri-cli": patch:bug
+---
+
+Use v2 stable instead of v2-rc when migrating from v2-beta

crates/tauri-cli/src/migrate/migrations/mod.rs

@@ -3,4 +3,4 @@
 // SPDX-License-Identifier: MIT
 
 pub mod v1;
-pub mod v2_rc;
+pub mod v2_beta;

crates/tauri-cli/src/migrate/migrations/v2_beta.rs

@@ -72,7 +72,7 @@ fn migrate_npm_dependencies(frontend_dir: &Path) -> Result<()> {
       .unwrap_or_default()
       .unwrap_or_default();
     if version.starts_with('1') {
-      install_deps.push(format!("{pkg}@^2.0.0-rc.0"));
+      install_deps.push(format!("{pkg}@^2.0.0"));
     }
   }
 
@@ -111,7 +111,7 @@ fn migrate_permissions(tauri_dir: &Path) -> Result<()> {
 }
 
 fn migrate_manifest(manifest: &mut DocumentMut) -> Result<()> {
-  let version = "2.0.0-rc.0";
+  let version = "2.0.0";
 
   let dependencies = manifest
     .as_table_mut()

crates/tauri-cli/src/migrate/mod.rs

@@ -13,7 +13,7 @@ use crate::{
 
 use std::{fs::read_to_string, str::FromStr};
 
-use anyhow::Context;
+use anyhow::{bail, Context};
 
 mod migrations;
 
@@ -47,9 +47,22 @@ pub fn command() -> Result<()> {
     migrations::v1::run().context("failed to migrate from v1")?;
   } else if tauri_version.major == 2 {
     if let Some((pre, _number)) = tauri_version.pre.as_str().split_once('.') {
-      if pre == "beta" {
-        migrations::v2_rc::run().context("failed to migrate from v2 beta to rc")?;
+      match pre {
+        "beta" => {
+          migrations::v2_beta::run().context("failed to migrate from v2 beta")?;
+        }
+        "alpha" => {
+          bail!(
+            "Migrating from v2 alpha ({tauri_version}) to v2 stable is not supported yet, \
+             if your project started early, try downgrading to v1 and then try again"
+          )
+        }
+        _ => {
+          bail!("Migrating from {tauri_version} to v2 stable is not supported yet")
+        }
       }
+    } else {
+      log::info!("Nothing to do, the tauri version is already at v2 stable");
     }
   }