Fix redis-check-aof incorrectly considering data in manifest format as MP-AOF (#12958)

The check in fileIsManifest misjudged the manifest file. For example,
if resp aof contains "file", it will be considered a manifest file and
the check will fail:
```
*3
$3
set
$4
file
$4
file
```

In #12951, if the preamble aof also contains it, it will also fail.
Fixes #12951.

the bug was happening if the the word "file" is mentioned
in the first 1024 lines of the AOF. and now as soon as it finds
a non-comment line it'll break (if it contains "file" or doesn't)

src/aof.c

@@ -117,7 +117,9 @@ aofInfo *aofInfoDup(aofInfo *orig) {
     return ai;
 }
 
-/* Format aofInfo as a string and it will be a line in the manifest. */
+/* Format aofInfo as a string and it will be a line in the manifest.
+ *
+ * When update this format, make sure to update redis-check-aof as well. */
 sds aofInfoFormat(sds buf, aofInfo *ai) {
     sds filename_repr = NULL;
 

src/redis-check-aof.c

@@ -234,6 +234,7 @@ int checkSingleAof(char *aof_filename, char *aof_filepath, int last_file, int fi
     struct redis_stat sb;
     if (redis_fstat(fileno(fp),&sb) == -1) {
         printf("Cannot stat file: %s, aborting...\n", aof_filename);
+        fclose(fp);
         exit(1);
     }
 
@@ -345,6 +346,7 @@ int fileIsRDB(char *filepath) {
     struct redis_stat sb;
     if (redis_fstat(fileno(fp), &sb) == -1) {
         printf("Cannot stat file: %s\n", filepath);
+        fclose(fp);
         exit(1);
     }
 
@@ -381,6 +383,7 @@ int fileIsManifest(char *filepath) {
     struct redis_stat sb;
     if (redis_fstat(fileno(fp), &sb) == -1) {
         printf("Cannot stat file: %s\n", filepath);
+        fclose(fp);
         exit(1);
     }
 
@@ -397,15 +400,20 @@ int fileIsManifest(char *filepath) {
                 break;
             } else {
                 printf("Cannot read file: %s\n", filepath);
+                fclose(fp);
                 exit(1);
             }
         }
 
-        /* Skip comments lines */
+        /* We will skip comments lines.
+         * At present, the manifest format is fixed, see aofInfoFormat.
+         * We will break directly as long as it encounters other items. */
         if (buf[0] == '#') {
             continue;
         } else if (!memcmp(buf, "file", strlen("file"))) {
             is_manifest = 1;
+        } else {
+            break;
         }
     }
 

tests/integration/aof.tcl

@@ -481,6 +481,18 @@ tags {"aof external:skip"} {
         assert_match "*Start checking Old-Style AOF*is valid*" $result
     }
 
+    test {Test redis-check-aof for old style resp AOF - has data in the same format as manifest} {
+        create_aof $aof_dirpath $aof_file {
+            append_to_aof [formatCommand set file file]
+            append_to_aof [formatCommand set "file appendonly.aof.2.base.rdb seq 2 type b" "file appendonly.aof.2.base.rdb seq 2 type b"]
+        }
+
+        catch {
+            exec src/redis-check-aof $aof_file
+        } result
+        assert_match "*Start checking Old-Style AOF*is valid*" $result
+    }
+
     test {Test redis-check-aof for old style rdb-preamble AOF} {
         catch {
             exec src/redis-check-aof tests/assets/rdb-preamble.aof
@@ -529,6 +541,19 @@ tags {"aof external:skip"} {
         assert_match "*Start checking Multi Part AOF*Start to check BASE AOF (RDB format)*DB preamble is OK, proceeding with AOF tail*BASE AOF*is valid*Start to check INCR files*INCR AOF*is valid*All AOF files and manifest are valid*" $result
     }
 
+    test {Test redis-check-aof for Multi Part AOF contains a format error} {
+        create_aof_manifest $aof_dirpath $aof_manifest_file {
+            append_to_manifest "file appendonly.aof.1.base.aof seq 1 type b\n"
+            append_to_manifest "file appendonly.aof.1.incr.aof seq 1 type i\n"
+            append_to_manifest "!!!\n"
+        }
+
+        catch {
+            exec src/redis-check-aof $aof_manifest_file
+        } result
+        assert_match "*Invalid AOF manifest file format*" $result
+    }
+
     test {Test redis-check-aof only truncates the last file for Multi Part AOF in fix mode} {
         create_aof $aof_dirpath $aof_base_file {
             append_to_aof [formatCommand set foo hello]