Add automatic DNS forwarder setup for IPA-AD trust

[madhuriupadhye]

IPA trust tests fail with "Unable to read domain information" when IPA's DNS cannot resolve the AD domain.

Added setup_dns_forwarder() to IPATrustADTopologyController that: Creates a DNS forward zone for the AD domain
Resolves AD hostname to IP (required by ipa dnsforwardzone-add) Restarts named to apply the configuration

[gemini-code-assist]

Summary of Changes

Hello @madhuriupadhye, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the IPA-AD trust test setup by automating the configuration of DNS forwarding on the IPA server. Previously, trust tests could fail if the IPA's DNS was unable to resolve the Active Directory domain. The changes introduce a new utility method that ensures proper DNS resolution for the AD domain, making the trust establishment process more robust and reliable within the test framework.

Highlights

• Automatic DNS Forwarder Setup: Introduced an automatic mechanism to configure a DNS forwarder on the IPA server for the trusted Active Directory (AD) domain. This ensures that IPA can correctly resolve AD domain names, which is crucial for establishing trust.
• New setup_dns_forwarder Method: A new method, setup_dns_forwarder, has been added to IPATrustADTopologyController. This method handles the logic for creating the DNS forward zone, resolving the AD hostname to an IP address, and restarting the named service.
• Improved Trust Test Reliability: By automatically configuring the DNS forwarder, the pull request addresses and resolves issues where IPA trust tests failed due to an inability to read AD domain information, thereby improving the reliability of these tests.

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[gemini-code-assist]

Code Review

This pull request introduces an automatic DNS forwarder setup for IPA-AD trust, which is a valuable addition to improve the reliability of trust tests. The implementation correctly identifies the need to configure DNS on the IPA server. I've found one potential issue with the error handling for DNS resolution of the AD host and provided a suggestion to make the implementation more robust and prevent hard-to-debug failures.

[jakub-vavra-cz]

LGTM

[thalman]

Looks good, ACK

[danlavu]

Hrmmm... I'm late to the party, we could replace most of this code with.

self.role.ipa.dns().add_forwarder(getattr(trusted.conn, "host", trusted.hostname))