{"record":{"id":"f8c972160afad707","repo":"slimtoolkit/slim","slug":"error-parsing-uid-field-s-v","errorCode":null,"errorMessage":"error parsing UID field - %s (%v)","messagePattern":"error parsing UID field - (.+?) \\((.+?)\\)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"pkg/sysidentity/sysidentity.go","lineNumber":330,"sourceCode":"\tparts := strings.Split(line, \":\")\n\tif len(parts) != 7 {\n\t\treturn record, errors.New(\"unexpected field count\")\n\t}\n\n\trecord.Username = parts[0]\n\trecord.Password = parts[1]\n\trecord.Info = parts[4]\n\trecord.Home = parts[5]\n\trecord.Shell = strings.TrimSpace(parts[6])\n\n\tif _, found := NoLoginShells[record.Shell]; found {\n\t\trecord.NoLoginShell = true\n\t}\n\n\tvar err error\n\trecord.UID, err = strconv.Atoi(parts[2])\n\tif err != nil {\n\t\treturn record, fmt.Errorf(\"error parsing UID field - %s (%v)\", parts[2], err)\n\t}\n\n\trecord.GID, err = strconv.Atoi(parts[3])\n\tif err != nil {\n\t\treturn record, fmt.Errorf(\"error parsing GID field - %s (%v)\", parts[3], err)\n\t}\n\n\treturn record, nil\n}\n\nconst (\n\tHasShadowFileRecord = \"x\"\n)\n\nfunc (ref PasswdRecord) UsesShadow() bool {\n\tif ref.Password == HasShadowFileRecord {\n\t\treturn true\n\t}","sourceCodeStart":312,"sourceCodeEnd":348,"githubUrl":"https://github.com/slimtoolkit/slim/blob/81940d17fa112cc678e32209214bcb2355cb3004/pkg/sysidentity/sysidentity.go#L312-L348","documentation":"sysidentity.ParsePasswdRecord parses a line from /etc/passwd split into ':'-separated fields; field index 2 is the UID. If strconv.Atoi cannot convert that field to an integer, the parser returns this error together with the partially filled record. It indicates a malformed passwd entry rather than a library bug.","triggerScenarios":"ReadPasswdData -> ParsePasswdRecord on a passwd line whose third field is not a decimal number (empty or contains letters/spaces).","commonSituations":"Hand-edited or corrupted /etc/passwd; leftover comment or placeholder lines like 'user:x::...'; LDAP/sssd-generated entries with non-numeric UIDs; trailing whitespace or invisible characters.","solutions":["Open /etc/passwd and fix or remove the line whose UID field is non-numeric","Validate the file: awk -F: '$3 !~ /^[0-9]+$/{print}' /etc/passwd","Restore the file from a package-managed backup (e.g. 'pam-auth-update' base or rpm -V setup / dpkg -V passwd)","If records come from a name-service switch source, fix the upstream directory entry"],"exampleFix":"// before (bad /etc/passwd line)\nsvc:x::1000::/home/svc:/bin/sh\n// after\nsvc:x:1500:1500::/home/svc:/bin/sh","handlingStrategy":"validation","validationCode":"// pre-validate /etc/passwd lines\nfunc validPasswdLine(line string) bool {\n    parts := strings.Split(line, \":\")\n    if len(parts) < 4 { return false }\n    _, err1 := strconv.Atoi(parts[2])\n    return err1 == nil\n}","typeGuard":null,"tryCatchPattern":"rec, err := sysidentity.ParsePasswdRecord(line)\nif err != nil {\n    log.Warnf(\"skipping malformed passwd entry: %v\", err)\n    continue\n}","preventionTips":["Never hand-edit /etc/passwd; use useradd/usermod","Lint identity files after provisioning scripts","Monitor files for unexpected changes (AIDE/tripwire)","Test with: awk -F: '$3 !~ /^[0-9]+$/{print}' /etc/passwd"],"tags":["parsing","passwd","identity"],"backgroundTag":"passwd-parse-error","analyzedSha":"81940d17fa112cc678e32209214bcb2355cb3004","analyzedAt":"2026-08-31T23:06:12.682Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-08T05:18:18.240Z"}