{"record":{"id":"756cd86b886c490c","repo":"caddyserver/caddy","slug":"reading-envfile-flag-v","errorCode":null,"errorMessage":"reading envfile flag: %v","messagePattern":"reading envfile flag: (.+?)","errorType":"console","errorClass":null,"httpStatus":null,"severity":"error","filePath":"cmd/commandfuncs.go","lineNumber":56,"sourceCode":"\n\t\"github.com/caddyserver/caddy/v2\"\n\t\"github.com/caddyserver/caddy/v2/caddyconfig\"\n\t\"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile\"\n\t\"github.com/caddyserver/caddy/v2/internal\"\n)\n\nfunc cmdStart(fl Flags) (int, error) {\n\tconfigFlag := fl.String(\"config\")\n\tconfigAdapterFlag := fl.String(\"adapter\")\n\tpidfileFlag := fl.String(\"pidfile\")\n\twatchFlag := fl.Bool(\"watch\")\n\n\tvar err error\n\tvar envfileFlag []string\n\tenvfileFlag, err = fl.GetStringSlice(\"envfile\")\n\tif err != nil {\n\t\treturn caddy.ExitCodeFailedStartup,\n\t\t\tfmt.Errorf(\"reading envfile flag: %v\", err)\n\t}\n\n\t// open a listener to which the child process will connect when\n\t// it is ready to confirm that it has successfully started\n\tln, err := listenTCPForPingback(net.Listen)\n\tif err != nil {\n\t\treturn caddy.ExitCodeFailedStartup,\n\t\t\tfmt.Errorf(\"opening listener for success confirmation: %v\", err)\n\t}\n\tdefer ln.Close()\n\n\t// craft the command with a pingback address and with a\n\t// pipe for its stdin, so we can tell it our confirmation\n\t// code that we expect so that some random port scan at\n\t// the most unfortunate time won't fool us into thinking\n\t// the child succeeded (i.e. the alternative is to just\n\t// wait for any connection on our listener, but better to\n\t// ensure it's the process we're expecting - we can be","sourceCodeStart":38,"sourceCodeEnd":74,"githubUrl":"https://github.com/caddyserver/caddy/blob/50e54ee279aa1e504fe218ca49ab6ae16c100410/cmd/commandfuncs.go#L38-L74","documentation":"Returned by the `caddy start` command when reading the --envfile flag's string slice fails. This is a command-line parsing error from the flag layer, not a file I/O error — the flag value itself could not be interpreted as a string slice. Practically it signals a malformed repeated flag or a flag-definition mismatch.","triggerScenarios":"Passing --envfile in a form the flag parser cannot coerce to a slice; invoking caddy start through a wrapper that mangles flag arguments; version mismatch where the running binary's flag set differs from the invoked one.","commonSituations":"Shell scripts quoting flags incorrectly; aliases or wrappers appending stray arguments; extremely rare in normal use.","solutions":["Run caddy start --envfile ./env once with simple quoting to isolate the flag","Print help (caddy start --help) and confirm the flag spelling and expected format","Drop --envfile and export the variables directly if the flag keeps failing"],"exampleFix":"# before\ncaddy start --envfile\n# after\ncaddy start --envfile ./.env","handlingStrategy":"validation","validationCode":null,"typeGuard":null,"tryCatchPattern":"exitCode, err := cmdStart(fl)\nif err != nil && strings.Contains(err.Error(), \"reading envfile flag\") {\n    // flag-layer failure: correct the --envfile arguments and re-invoke\n    log.Fatal(\"check --envfile spelling/value; run: caddy start --help\")\n}","preventionTips":["Quote flag values exactly once; avoid nested quoting in wrappers","Pin the Caddy version your scripts were written against"],"tags":["cli","flags","caddy-start","env"],"backgroundTag":null,"analyzedSha":"50e54ee279aa1e504fe218ca49ab6ae16c100410","analyzedAt":"2026-08-15T09:20:21.641Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}