{"record":{"id":"78874b2d42c8c553","repo":"golang/go","slug":"git-credential-fill-failed-for-url-s-could-not","errorCode":null,"errorMessage":"'git credential fill' failed for url=%s, could not parse url\n","messagePattern":"'git credential fill' failed for url=(.+?), could not parse url\n","errorType":"error_code","errorClass":null,"httpStatus":null,"severity":"error","filePath":"src/cmd/go/internal/auth/gitauth.go","lineNumber":54,"sourceCode":"\t\t// provides no way to enumerate existing credentials.\n\t\t// Wait for a request for a specific url.\n\t\treturn \"\", nil, fmt.Errorf(\"no explicit url was passed\")\n\t}\n\tif dir == \"\" {\n\t\t// Prevent config-injection attacks by requiring an explicit working directory.\n\t\t// See https://golang.org/issue/29230 for details.\n\t\tpanic(\"'git' invoked in an arbitrary directory\") // this should be caught earlier.\n\t}\n\tcmd := exec.Command(\"git\", \"credential\", \"fill\")\n\tcmd.Dir = dir\n\tcmd.Stdin = strings.NewReader(fmt.Sprintf(\"url=%s\\n\", url))\n\tout, err := cmd.CombinedOutput()\n\tif err != nil {\n\t\treturn \"\", nil, fmt.Errorf(\"'git credential fill' failed (url=%s): %w\\n%s\", url, err, out)\n\t}\n\tparsedPrefix, username, password := parseGitAuth(out)\n\tif parsedPrefix == \"\" {\n\t\treturn \"\", nil, fmt.Errorf(\"'git credential fill' failed for url=%s, could not parse url\\n\", url)\n\t}\n\t// Check that the URL Git gave us is a prefix of the one we requested.\n\tif !strings.HasPrefix(url, parsedPrefix) {\n\t\treturn \"\", nil, fmt.Errorf(\"requested a credential for %s, but 'git credential fill' provided one for %s\\n\", url, parsedPrefix)\n\t}\n\treq, err := http.NewRequest(\"HEAD\", parsedPrefix, nil)\n\tif err != nil {\n\t\treturn \"\", nil, fmt.Errorf(\"internal error constructing HTTP HEAD request: %v\\n\", err)\n\t}\n\treq.SetBasicAuth(username, password)\n\t// Asynchronously validate the provided credentials using a HEAD request,\n\t// allowing the git credential helper to update its cache without blocking.\n\t// This avoids repeatedly prompting the user for valid credentials.\n\t// This is a best-effort update; the primary validation will still occur\n\t// with the caller's client.\n\t// The request is intercepted for testing purposes to simulate interactions\n\t// with the credential helper.\n\tintercept.Request(req)","sourceCodeStart":36,"sourceCodeEnd":72,"githubUrl":"https://github.com/golang/go/blob/b6b368adc57c96c3151d224d172029f233ead2c3/src/cmd/go/internal/auth/gitauth.go#L36-L72","documentation":"Returned by runGitAuth when `git credential fill` succeeded (exit 0) but parseGitAuth could not extract any URL/prefix from its output. parseGitAuth reads protocol/host/path/username/password/url key=value lines; if none of protocol/host/path and no usable url line is present, parsedPrefix stays empty and the exporter cannot form a URL to associate the credential with.","triggerScenarios":"git's output contains username/password but omits protocol, host, path, and any usable url line, or those fields are all malformed (parseGitAuth silently skips a malformed url line).","commonSituations":"A custom or broken credential helper that returns credentials without host information; a git version emitting an unexpected output format; a helper that only stores username/password.","solutions":["Manually inspect `git credential fill` output: `printf 'url=https://example.com\\n' | git credential fill`.","Ensure the credential helper returns protocol and host (or a full url line).","Switch to a standard helper (store/manager/osxkeychain) to isolate the issue.","Run with `go -x` to see the malformed URL log line emitted by parseGitAuth."],"exampleFix":null,"handlingStrategy":"validation","validationCode":"// Sanity-check that git credential fill returns a parseable URL.\nout, err := exec.Command(\"git\", \"credential\", \"fill\").CombinedOutput()\n// feed url=... on stdin\nif err != nil { return err }\nif !bytes.Contains(out, []byte(\"host=\")) && !bytes.Contains(out, []byte(\"url=\")) {\n    return errors.New(\"credential helper returned no host/url information\")\n}","typeGuard":null,"tryCatchPattern":null,"preventionTips":["Ensure the credential helper returns protocol+host or a full url line.","Prefer standard helpers (store/manager) over custom ones.","Inspect `git credential fill` output when debugging."],"tags":["go-toolchain","goauth","git","authentication","parsing","credentials"],"backgroundTag":null,"analyzedSha":"b6b368adc57c96c3151d224d172029f233ead2c3","analyzedAt":"2026-08-12T00:22:02.250Z","schemaVersion":2},"datasetVersion":"2026-08-12T12:31:55.035Z"}