Extracting bad log_excerpt "': File exists\n"

[tales-aparecida]

e.g. https://d.kernelci.org/issue/maestro%3A5b8b0e14fb5c4341239b6e160d2f4453d8c11905

04:41:39   CC       acct_syscall
04:41:39   CC       tags_test
04:41:43 cp: cannot create regular file '/tmp/kci/artifacts/build/kselftest/arm64/signal/fake_sigreturn_bad_magic': File exists
04:41:43 make[2]: *** [Makefile:21: /tmp/kci/artifacts/build/kselftest/arm64/signal/fake_sigreturn_bad_magic] Error 1
04:41:43 make[2]: Target 'all' not remade because of errors.

becomes

{
  "error": {
    "script": "Makefile:21",
    "target": "/tmp/kci/artifacts/build/kselftest/arm64/signal/fake_sigreturn_bad_magic",
    "error_type": "kbuild.other",
    "log_excerpt": "': File exists\n",
    "signature_fields": {
      "script": "Makefile:21",
      "target": "/tmp/kci/artifacts/build/kselftest/arm64/signal/fake_sigreturn_bad_magic",
      "error_type": "kbuild.other",
      "error_summary": ""
    }
  },
  "parser": "kbuild",
  "version": "1.0.0"
}