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Unless otherwise configured, the client libraries use Application Default Credentials to authenticate with Google Cloud Services. While this works for most applications, in some cases you may need to override this default. You can do so by providing the UnifiedCredentialsOption The following example shows how to explicitly load a service account key file:
[](std::string const& keyfile){ auto is = std::ifstream(keyfile); is.exceptions(std::ios::badbit);// Minimal error handling in examples auto contents = std::string(std::istreambuf_iterator<char>(is.rdbuf()),{}); auto options = google::cloud::Options{}.set<google::cloud::UnifiedCredentialsOption>( google::cloud::MakeServiceAccountCredentials(contents)); return google::cloud::cloudbuild_v1::CloudBuildClient( google::cloud::cloudbuild_v1::MakeCloudBuildConnection(options)); }
Follow these links to find examples for other *Client classes:
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-04-02 UTC."],[[["This document details how to override the default authentication credentials used by the client libraries when interacting with Google Cloud Services, specifically within the context of the Cloud Build service and its various versions."],["The latest version for the C++ Cloud Build API is 2.37.0-rc, while the listed versions range from 2.11.0 to 2.37.0-rc, all documented for overriding authentication."],["Overriding authentication can be achieved by utilizing the `UnifiedCredentialsOption`, as demonstrated with an example of loading a service account key file."],["There are client examples provided, such as `cloudbuild_v1::CloudBuildClient` and `cloudbuild_v2::RepositoryManagerClient`, that further illustrate the override process."],["The document also provides links to best practices for managing service account keys, and for obtaining more information about creating `google::cloud::Credentials`."]]],[]]
