const (
    // EnvCredentials is the name of the environment variable pointing to a
    // directory containing all the credentials of a principal (the blessing
    // store, the blessing roots, possibly the private key etc.).
    //
    // Typically only one of EnvCredentials or EnvAgentPath will be set in a
    // process. If both are set, then EnvCredentials takes preference.
    //
    // See v.io/x/ref/lib/security.CreatePersistentPrincipal.
    EnvCredentials = "V23_CREDENTIALS"

    // When set and non-empty, EnvCredentials is hosted on a read-only
    // filesystem.
    EnvCredentialsReadonlyFileSystem = "V23_CREDENTIALS_READONLY_FILESYSTEM"

    // EnvCredentialsNoLockDeprecated and V23_CREDENTIALS_NO_LOCK will
    // be removed in a subsequent release. This is essentially an alias
    // for V23_CREDENTIALS_READONLY_FILESYSTEM which should be used
    // instead.
    EnvCredentialsNoLockDeprecated = "V23_CREDENTIALS_NO_LOCK"

    // EnvCredentialsReloadInterval is the name of the environment variable
    // that specifies the interval between credentials reloads.
    EnvCredentialsReloadInterval = "V23_CREDENTIALS_RELOAD_INTERVAL"

    // EnvNamespacePrefix is the prefix of all environment variables that
    // define a namespace root.
    EnvNamespacePrefix = "V23_NAMESPACE"

    // EnvI18nCatalogueFiles is the name of the environment variable
    // pointing to a comma-separated list of i18n catalogue files to be
    // loaded at startup.
    EnvI18nCatalogueFiles = "V23_I18N_CATALOGUE"

    // EnvOAuthIdentityProvider is the name of the environment variable
    // pointing to the url of the OAuth identity provider used by the
    // principal seekblessings command.
    EnvOAuthIdentityProvider = "V23_OAUTH_IDENTITY_PROVIDER"

    // When EnvExpectGoogleComputeEngine is set and non-empty, the runtime
    // initialization will fail if the GCE metadata is inaccessible.
    // Deprecated: use V23_VIRTUALIZATION_PROVIDER instead.
    EnvExpectGoogleComputeEngine = "V23_EXPECT_GOOGLE_COMPUTE_ENGINE"

    // EnvVirtualizationProvider is the name of the environment variable
    // naming the virtualization/cloud provider that the process is
    // expected to be run under. It replaces EnvExpectGoogleComputeEngine.
    EnvVirtualizationProvider = "V23_VIRTUALIZATION_PROVIDER"

    // A comma-separated list of path names to export disk stats for.
    EnvSysStatsDiskPaths = "V23_SYS_STATS_DISK_PATHS"

    // When set and non-empty, the namespace client will not use caching.
    EnvDisableNamespaceCache = "V23_DISABLE_NS_CACHE"
)