fix: improve install error when pre-release driver already installed (#340)

Author: zeroshade

cmd/dbc/install.go

@@ -288,6 +288,13 @@ func (m progressiveInstallModel) searchForDriver(list []dbc.Driver) (tea.Model,
 
 		pkg, err := d.GetPackage(nil, config.PlatformTuple(), m.Pre)
 		if err != nil {
+			if !m.Pre && !d.HasNonPrerelease() {
+				for _, cfg := range config.Get() {
+					if di, ok := cfg.Drivers[driverName]; ok && di.Version != nil && di.Version.Prerelease() != "" {
+						return fmt.Errorf("driver `%s` is already installed (version %s); only pre-release versions are available for this driver; to update, use: dbc install --pre %s", driverName, di.Version, driverName)
+					}
+				}
+			}
 			return err
 		}
 

cmd/dbc/install_test.go

@@ -351,6 +351,21 @@ func (suite *SubcommandTestSuite) TestInstallWithoutPreOnlyPrereleaseDriver() {
 	suite.driverIsNotInstalled("test-driver-only-pre")
 }
 
+func (suite *SubcommandTestSuite) TestInstallWithoutPreWhenPrereleaseAlreadyInstalled() {
+	m := InstallCmd{Driver: "test-driver-only-pre", Level: suite.configLevel, Pre: true}.
+		GetModelCustom(baseModel{getDriverRegistry: getTestDriverRegistry, downloadPkg: downloadTestPkg})
+	suite.runCmd(m)
+	suite.driverIsInstalled("test-driver-only-pre", false)
+
+	m = InstallCmd{Driver: "test-driver-only-pre", Level: suite.configLevel, Pre: false}.
+		GetModelCustom(baseModel{getDriverRegistry: getTestDriverRegistry, downloadPkg: downloadTestPkg})
+	out := suite.runCmdErr(m)
+
+	suite.Contains(out, "already installed")
+	suite.Contains(out, "0.9.0-alpha.1")
+	suite.Contains(out, "dbc install --pre test-driver-only-pre")
+}
+
 func (suite *SubcommandTestSuite) TestInstallExplicitPrereleaseWithoutPreFlag() {
 	// Install explicit prerelease version WITHOUT --pre flag, should succeed per requirement
 	m := InstallCmd{Driver: "test-driver-only-pre=0.9.0-alpha.1", Level: suite.configLevel, Pre: false}.