cmd/use: Validate version in dot file against repo

When running "hvm use --useVersionInDotFile", validate the version
against the tags in the repository.

cmd/hvm/status.go

@@ -22,7 +22,6 @@ import (
 	"io/fs"
 	"os"
 	"path/filepath"
-	"regexp"
 	"slices"
 	"strings"
 
@@ -233,9 +232,7 @@ func getVersionFromDotFile(path string) (string, error) {
 		return "", fmt.Errorf("the %s file in the current directory is empty: %s", App.DotFileName, theFix)
 	}
 
-	re := regexp.MustCompile(`^v\d+\.\d+\.\d+$`)
-	match := re.MatchString(dotHvmContent)
-	if !match {
+	if !semver.IsValid(dotHvmContent) {
 		return "", fmt.Errorf("the %s file in the current directory has an invalid format: %s", App.DotFileName, theFix)
 	}
 

cmd/hvm/testscripts/status/status_err_3.txtar

@@ -0,0 +1,14 @@
+# User cache and config dirs (we use os.UserCacheDir and os.UserCongfigDir)
+[darwin] env HOME=home
+[darwin] mkdir "$HOME/Library/Caches"
+[darwin] mkdir "$HOME/Library/Application Support"
+[linux] env XDG_CACHE_HOME=cache
+[linux] env XDG_CONFIG_HOME=config
+[windows] env LocalAppData=cache
+[windows] env AppData=config
+
+# Test
+! exec hvm status
+stderr 'Error: the version specified in the \.hvm file \(v\d+\.\d+\.\d+\) is not available in the repository: run "hvm use" to select a version, or "hvm disable" to remove the file\n'
+-- .hvm --
+v9.999.9

cmd/hvm/use.go

@@ -26,6 +26,7 @@ import (
 	"path/filepath"
 	"regexp"
 	"runtime"
+	"slices"
 	"strconv"
 	"strings"
 
@@ -93,6 +94,11 @@ func use(useVersionInDotFile bool) error {
 			fmt.Fprintln(os.Stderr, "Error: the current directory does not contain an "+App.DotFileName+" file")
 			os.Exit(1)
 		}
+		if !slices.Contains(repo.tags, version) {
+			theFix := fmt.Sprintf("run \"%[1]s use\" to select a version, or \"%[1]s disable\" to remove the file", App.Name)
+			fmt.Fprintf(os.Stderr, "Error: the version specified in the "+App.DotFileName+" file (%s) is not available in the repository: %s\n", version, theFix)
+			os.Exit(1)
+		}
 		asset.tag = version
 	} else {
 		msg := "Select a version to use in the current directory"
@@ -158,6 +164,12 @@ func newRepository() *repository {
 		owner:  App.RepositoryOwner,
 	}
 
+	err := r.fetchTags()
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+
 	return &r
 }
 
@@ -248,12 +260,6 @@ func (r *repository) fetchTags() error {
 
 // selectTag prompts the user to select a tag from a list of recent tags.
 func (r *repository) selectTag(a *asset, msg string) error {
-
-	err := r.fetchTags()
-	if err != nil {
-		return err
-	}
-
 	// List tags.
 	fmt.Println()