Scancode flags a .sln file as being under the json license

[omajid]

Description

scancode says this file is under the JSON license, when in actuality there's no license information in this file at all:

https://raw.githubusercontent.com/dotnet/dotnet/release/8.0.1xx/src/source-build-externals/src/xunit/xunit.sln

How To Reproduce

$ wget https://raw.githubusercontent.com/dotnet/dotnet/release/8.0.1xx/src/source-build-externals/src/xunit/xunit.sln
$ /scancode --json-pp - --license --unknown-licenses --license-references  xunit.sln 
Setup plugins...             
Collect file inventory...     
Scan files for: licenses with 1 process(es)...
[####################] 2                                                       
{                                
  "headers": [                
    {                                                                          
      "tool_name": "scancode-toolkit",                                                                                                                        
      "tool_version": "32.0.7",                                                                                                                               
      "options": {                                                                                                                                            
        "input": [                                                                                                                                            
          "xunit.sln"                                                                                                                                         
        ],                                                                                                                                                    
        "--json-pp": "-",                                                                                                                                     
        "--license": true,
        "--license-references": true,                                                                                                                         
        "--unknown-licenses": true                 
...
  "files": [
    {
      "path": "xunit.sln",
      "type": "file",
      "detected_license_expression": "json",
      "detected_license_expression_spdx": "JSON",
      "license_detections": [
        {
          "license_expression": "json",
          "matches": [
            {
              "score": 100.0,
              "start_line": 20,
              "end_line": 21,
              "matched_length": 2,
              "match_coverage": 100.0,
              "matcher": "2-aho",
              "license_expression": "json",
              "rule_identifier": "json_5.RULE",
              "rule_relevance": 100,
              "rule_url": "https://github.com/nexB/scancode-toolkit/tree/develop/src/licensedcode/data/rules/json_5.RULE"
            }
          ],
          "identifier": "json-a22df283-4cbb-b1f3-dac1-6aa82c584b30"
        }
      ],
      "license_clues": [],
      "percentage_of_license_text": 0.02,
      "scan_errors": []
    }
...

System configuration

• What OS are you running on? Linux
• What version of scancode-toolkit was used to generate the scan file?32.0.7
• What installation method was used to install/run scancode? pip

[omajid]

I suppose it's this bit in the file that leads to the false positive:

        global.json = global.json
        license.txt = license.txt

[mthalman]

Here's a permalink to that file: https://raw.githubusercontent.com/dotnet/dotnet/da9e54383e0b233f07c49e9fe762b4b2325f9bb1/src/source-build-externals/src/xunit/xunit.sln

[pombredanne]

Thanks. This is a bug alright and easily fixable by adding a new rule to avoid the false positive detection with something like this added as file in src/licensedcode/data/rules/ named for instance: false-positive_720.RULE:

---
is_false_positive: yes
notes: not a JSON license reference
---
  global.json = global.json
        license.txt = license.txt

[AyanSinhaMahapatra]

this is fixed, closing!
thanks @pombredanne @omajid