csgrep --warning-rate-limit: drop location from key events

... to ease finding deduplication.  If a checker is too noisy, a small
change in the code could unexpectedly change the location (including the
file path) of the `error[too-many]` key event, which would hamper the
deduplication of findings.

Related: https://issues.redhat.com/browse/OSH-496

Author: kdudka

src/lib/defect.hh

@@ -65,6 +65,15 @@ struct DefEvent {
         event(event)
     {
     }
+
+    void clearLoc()
+    {
+        this->fileName.clear();
+        this->line = 0;
+        this->column = 0;
+        this->hSize = 0;
+        this->vSize = 0;
+    }
 };
 
 ///< return (end - beg) if it is positive and fits into target type, 0 otherwise

src/lib/filter.cc

@@ -281,6 +281,9 @@ void RateLimitter::flush()
         evtErr.event = "error[too-many]";
         evtErr.msg = err.str();
 
+        // drop location from the key event to ease finding deduplication
+        evtErr.clearLoc();
+
         // construct a note event
         note << (cnt - d->rateLimit) << " occurrences of "
             << evtNote.event << " were discarded because of this";

tests/csgrep/0110-warning-rate-limit-stdout.txt

@@ -1880,9 +1880,8 @@
             "key_event_idx": 0,
             "events": [
                 {
-                    "file_name": "./doc/example/compiler-etc-dependencies/example-sessions/ompi-defaults.sh",
-                    "line": 3,
-                    "column": 8,
+                    "file_name": "",
+                    "line": 0,
                     "event": "error[too-many]",
                     "message": "115 occurrences of note[SC2086] exceeded the specified limit 16",
                     "verbosity_level": 0
@@ -1905,9 +1904,8 @@
             "key_event_idx": 0,
             "events": [
                 {
-                    "file_name": "./init/bash_completion.in",
-                    "line": 128,
-                    "column": 37,
+                    "file_name": "",
+                    "line": 0,
                     "event": "error[too-many]",
                     "message": "29 occurrences of warning[SC2207] exceeded the specified limit 16",
                     "verbosity_level": 0

tests/csgrep/0116-csgrep-warning-rate-limit-stdout.txt

@@ -28,8 +28,8 @@
             "key_event_idx": 0,
             "events": [
                 {
-                    "file_name": "/builddir/build/BUILD/units-2.22/units.c",
-                    "line": 4988,
+                    "file_name": "",
+                    "line": 0,
                     "event": "error[too-many]",
                     "message": "1 occurrences of var_deref_model exceeded the specified limit 1",
                     "verbosity_level": 0
@@ -52,8 +52,8 @@
             "key_event_idx": 0,
             "events": [
                 {
-                    "file_name": "/builddir/build/BUILD/units-2.22/units.c",
-                    "line": 5058,
+                    "file_name": "",
+                    "line": 0,
                     "event": "error[too-many]",
                     "message": "3 occurrences of var_deref_op exceeded the specified limit 1",
                     "verbosity_level": 0
@@ -77,8 +77,8 @@
             "key_event_idx": 0,
             "events": [
                 {
-                    "file_name": "/builddir/build/BUILD/units-2.22/units.c",
-                    "line": 4600,
+                    "file_name": "",
+                    "line": 0,
                     "event": "error[too-many]",
                     "message": "2 occurrences of alloc_strlen exceeded the specified limit 1",
                     "verbosity_level": 0
@@ -102,8 +102,8 @@
             "key_event_idx": 0,
             "events": [
                 {
-                    "file_name": "/builddir/build/BUILD/units-2.22/units.c",
-                    "line": 3811,
+                    "file_name": "",
+                    "line": 0,
                     "event": "error[too-many]",
                     "message": "1 occurrences of leaked_handle exceeded the specified limit 1",
                     "verbosity_level": 0
@@ -127,8 +127,8 @@
             "key_event_idx": 0,
             "events": [
                 {
-                    "file_name": "/builddir/build/BUILD/units-2.22/units.c",
-                    "line": 4786,
+                    "file_name": "",
+                    "line": 0,
                     "event": "error[too-many]",
                     "message": "2 occurrences of leaked_storage exceeded the specified limit 1",
                     "verbosity_level": 0
@@ -151,8 +151,8 @@
             "key_event_idx": 0,
             "events": [
                 {
-                    "file_name": "/builddir/build/BUILD/units-2.22/units.c",
-                    "line": 402,
+                    "file_name": "",
+                    "line": 0,
                     "event": "error[too-many]",
                     "message": "1 occurrences of fs_check_call exceeded the specified limit 1",
                     "verbosity_level": 0
@@ -176,8 +176,8 @@
             "key_event_idx": 0,
             "events": [
                 {
-                    "file_name": "/builddir/build/BUILD/units-2.22/units.c",
-                    "line": 550,
+                    "file_name": "",
+                    "line": 0,
                     "event": "error[too-many]",
                     "message": "1 occurrences of uninit_use_in_call exceeded the specified limit 1",
                     "verbosity_level": 0