fix: file has been changed unintentionally (#404)

Author: y1yang0

Diff for: pkg/core/importer.go renamed to pkg/dep/importer.go

@@ -12,9 +12,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package core
+package dep
 
-// @@ There is a scenario where we want users to rely on our package (alibaba/pkg/core),
+// @@ We want users to rely on our package (alibaba-otel/pkg/dep),
 // and after executing go mod vendor, all related dependencies are fetched
 // locally. The subsequent build process can then be performed offline,
 // without relying on go mod tidy/vendor to fetch any additional dependencies.

Diff for: tool/preprocess/preprocess.go

@@ -710,10 +710,13 @@ func (dp *DepProcessor) preclean() {
 				util.Log("Remove obsolete import %v from %v",
 					ruleImport, file)
 			}
-		}
-		_, err := util.WriteAstToFile(astRoot, file)
-		if err != nil {
-			util.Log("Failed to write ast to %v: %v", file, err)
+			// Remove the import from the file, but before that, we need to
+			// backup the file
+			dp.backupFile(file)
+			_, err := util.WriteAstToFile(astRoot, file)
+			if err != nil {
+				util.Log("Failed to write ast to %v: %v", file, err)
+			}
 		}
 	}
 	// Clean otel_pkgdep directory