internal/rosa: read overridden version string from source

This is more correct than the hardcoded string and is generally more robust against relative paths.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/state.go

@@ -7,6 +7,7 @@ import (
 	"context"
 	"encoding/json"
 	"errors"
+	"fmt"
 	"io"
 	"io/fs"
 	"iter"
@@ -1255,6 +1256,16 @@ func (s *S) RegisterFS(fsys fs.FS) error {
 // The resulting IR is curable on the daemon. Must not be used concurrently with
 // any other method.
 func (s *S) SetSource(fsys fs.FS) error {
+	var version string
+	if p, err := fs.ReadFile(fsys, "cmd/dist/VERSION"); err != nil {
+		return err
+	} else if len(p) < 2 {
+		return fmt.Errorf("invalid version string %q", string(p))
+	} else {
+		version = unsafe.String(unsafe.SliceData(p), len(p))
+	}
+	version = version[1:len(version)-1] + "-CURRENT"
+
 	var buf bytes.Buffer
 	w, err := gzip.NewWriterLevel(&buf, gzip.BestSpeed)
 	if err != nil {
@@ -1326,7 +1337,7 @@ func (s *S) SetSource(fsys fs.FS) error {
 			return &Metadata{
 				Name:        name,
 				Description: "hakurei source tree (current)",
-				Version:     "1.0.0-CURRENT",
+				Version:     version,
 				Exclude:     true,
 			}, pkg.NewTar(pkg.NewDecompress(a, pkg.Gzip))
 		}),