Provisioning: set stable datasource UID with provisioning (#41769)

pkg/services/provisioning/datasources/config_reader.go

@@ -2,6 +2,7 @@ package datasources
 
 import (
 	"context"
+	"crypto/sha256"
 	"fmt"
 	"io/ioutil"
 	"os"
@@ -35,6 +36,12 @@ func (cr *configReader) readConfig(ctx context.Context, path string) ([]*configs
 			}
 
 			if datasource != nil {
+				for _, ds := range datasource.Datasources {
+					if ds.UID == "" && ds.Name != "" {
+						ds.UID = safeUIDFromName(ds.Name)
+					}
+				}
+
 				datasources = append(datasources, datasource)
 			}
 		}
@@ -138,3 +145,10 @@ func (cr *configReader) validateAccessAndOrgID(ctx context.Context, ds *upsertDa
 	}
 	return nil
 }
+
+func safeUIDFromName(name string) string {
+	h := sha256.New()
+	_, _ = h.Write([]byte(name))
+	bs := h.Sum(nil)
+	return strings.ToUpper(fmt.Sprintf("P%x", bs[:8]))
+}