An instance is created at the start of a build execution and discarded at the end of the execution.

### Build state

The "build state" holds the state for a build within the build definition for a single build execution, and is contained by the build tree state.

The build state is managed by the `BuildState` class.
An instance is created for each build in the build definition, once per build execution and is discarded at the end of the execution. 

        }
        skipConditionally(buildType)
    }

fun Requirements.requiresOs(os: Os) {
    contains("teamcity.agent.jvm.os.name", os.agentRequirement)
}

fun Requirements.requiresArch(os: Os, arch: Arch) {
    if (os == Os.MACOS) {
        contains("teamcity.agent.jvm.os.arch", arch.nameOnMac)
    } else {
        contains("teamcity.agent.jvm.os.arch", arch.nameOnLinuxWindows)
    }
}

# HTTP Basic Auth

For the simplest cases, you can use HTTP Basic Auth.

In HTTP Basic Auth, the application expects a header that contains a username and a password.

If it doesn't receive it, it returns an HTTP 401 "Unauthorized" error.

And returns a header `WWW-Authenticate` with a value of `Basic`, and an optional `realm` parameter.

That tells the browser to show the integrated prompt for a username and password.

    /**
     * Returns `true` if the control graph contains at least one of the [firCandidates].
     */
    private fun ControlFlowGraph.contains(firCandidates: Set<FirElement>): Boolean {
        for (node in nodes) {
            if (node.fir in firCandidates) {
                return true
            }
            if (node is CFGNodeWithSubgraphs<*> && node.subGraphs.any { it.contains(firCandidates) }) {
                return true

    "paid": true
}
```

and it would expect a response from that *external API* with a JSON body like:

```JSON
{
    "ok": true
}
```

!!! tip
    Notice how the callback URL used contains the URL received as a query parameter in `callback_url` (`https://www.external.org/events`) and also the invoice `id` from inside of the JSON body (`2expen51ve`).

### Add the callback router

// This file contains members that we should consider to pull upstream
// and make available to all Kotlin DSL users
package gradlebuild.basics.kotlindsl

import org.gradle.api.Project
import java.io.ByteArrayOutputStream
import java.io.File


/**
 * `dir / "sub"` is the same as `dir.resolve("sub")`.
 *
 * @see [File.resolve]
 */
operator fun File.div(child: String): File =
    resolve(child)

  val end = indexOfLastNonAsciiWhitespace(start, endIndex)
  return substring(start, end)
}

/**
 * Returns the index of the first character in this string that contains a character in
 * [delimiters]. Returns endIndex if there is no such character.
 */
fun String.delimiterOffset(
  delimiters: String,
  startIndex: Int = 0,
  endIndex: Int = length,
): Int {

!!! info
    Wenn Sie Container verwenden, beispielsweise mit Docker oder Kubernetes, erzähle ich Ihnen mehr darüber im nächsten Kapitel: [FastAPI in Containern – Docker](docker.md){.internal-link target=_blank}.

 * }
 *
 * fun foo() {
 *     val outer = Outer()
 *     outer.Inner()
 * }
 * ```
 *
 * While Kotlin always expects a constructor call when accessing `outer.Inner`, it nonetheless requires inner classes to be contained in
 * non-static scopes.
 */
internal class FirNonStaticMembersScope(
    private val delegate: FirContainingNamesAwareScope,
) : FirCallableFilteringScope(delegate) {

            names.add(internalName)
            prefixes.add("$internalName/")
        }
    }

    fun matches(packageName: String): Boolean {
        if (names.contains(packageName)) {
            return true
        }
        for (prefix in prefixes) {
            if (packageName.startsWith(prefix)) {
                names.add(packageName)
                return true
            }