upstream-downstream

name	upstream-downstream
description	Guide for using upstream and downstream variables and conditional content in AsciiDoc modules. Use when writing, editing, or reviewing .adoc files, when using product names, CLI commands, namespaces, or operator names in documentation, or when adding build-specific content for upstream (Forklift) vs downstream (MTV).

Upstream & Downstream Authoring

Golden Rule

Never hardcode a product name, CLI tool, namespace, or operator name. Always use the corresponding variable.

Variable Definitions

Downstream values live in documentation/modules/common-attributes.adoc. Upstream overrides live in _config.yml under asciidoctor.attributes.

Upstream builds load common-attributes.adoc first, then _config.yml overrides. Any variable not overridden in _config.yml leaks the downstream value into upstream.

Variable Quick Reference

Variable	Upstream (Forklift)	Downstream (MTV)
{build}	upstream	downstream
{project-full}	Forklift	Migration Toolkit for Virtualization
{project-short}	Forklift	MTV
{project-first}	Forklift	Migration Toolkit for Virtualization (MTV)
{virt}	KubeVirt	OpenShift Virtualization
{a-virt}	a KubeVirt	an OpenShift Virtualization
{ocp}	OKD	Red Hat OpenShift
{ocp-short}	OKD	OpenShift
{oc}	kubectl	oc
{namespace}	konveyor-forklift	openshift-mtv
{operator}	forklift-operator	mtv-operator
{operator-name}	Forklift Operator	MTV Operator
{rhv-full}	oVirt	Red Hat Virtualization
{rhv-short}	oVirt	RHV
{a-rhv}	an oVirt	a Red Hat Virtualization
{manager}	Engine	Manager
{must-gather}	quay.io/kubev2v/forklift-must-gather:latest	registry.redhat.io/.../mtv-must-gather-rhel8:{project-z-version}
{vmw}	(not overridden)	VMware

Downstream-only variables (no upstream override)

These exist only in common-attributes.adoc and are safe to use inside ifeval::["{build}" == "downstream"] blocks:

• {operator-name-ui} — Migration Toolkit for Virtualization Operator
• {ocp-name} — OpenShift
• {ocp-version} — e.g. 4.21
• {ocp-doc} — link prefix to Red Hat OCP docs
• {project-version} — e.g. 2.11
• {project-z-version} — e.g. 2.11.0
• {mtv-plan}, {mtv-mig} — Red Hat doc URLs

Conditional Content

Build-based conditionals (ifeval)

Use ifeval to show content only in one build:

ifeval::["{build}" == "upstream"]
This sentence appears only in the Forklift (upstream) docs.
endif::[]

ifeval::["{build}" == "downstream"]
This sentence appears only in the MTV (downstream) docs.
endif::[]

Critical syntax note: The variable must be wrapped in curly braces — "{build}", not "build". Without braces the condition compares a literal string and silently never matches.

Provider-specific conditionals (ifdef)

Modules reused across providers use ifdef guards. The attribute is set by the parent assembly via :context:.

Provider attributes: vmware, rhv, ova, ostack, cnv

ifdef::vmware[]
= Adding a {vmw} vSphere source provider
endif::[]
ifdef::rhv[]
= Adding {a-rhv} source provider
endif::[]

UI vs CLI conditionals

ifdef::web[]
. In the {ocp-short} web console, navigate to *Migration* > *Plans*.
endif::[]
ifdef::cli[]
. Run `{oc} get plans -n {namespace}`.
endif::[]

Context management in assemblies

Assemblies must save and restore :context: so nested includes don't clobber each other:

ifdef::context[:parent-context: {context}]
:context: vmware

\include::modules/adding-source-provider.adoc[leveloffset=+1]

ifdef::parent-context[:context: {parent-context}]
ifndef::parent-context[:!context:]

Variables in Code Blocks

Variables are not expanded inside literal blocks by default. Add the subs attribute:

[source,terminal,subs="attributes+"]
----
$ {oc} get pods -n {namespace}
----

For combined substitutions:

[options="nowrap" subs="+quotes,+attributes"]
----
$ {oc} get migration -n {namespace}
----

Common Pitfalls

1. "Red Hat {virt}" — renders as "Red Hat KubeVirt" upstream. Wrap in a build conditional or use a dedicated variable.
2. Downstream-only variables in shared content — if a variable has no upstream override (e.g. {vmw}), using it outside a downstream guard produces unexpected output upstream.
3. Forgetting subs="attributes+" — variables appear as literal {oc} in code blocks without it.
4. Missing braces in ifeval — ifeval::["build" == "upstream"] is always false; correct form is ifeval::["{build}" == "upstream"].
5. Hardcoded "oc" or "kubectl" — always use {oc} so the right CLI tool renders per build.
6. Hardcoded namespace — always use {namespace} instead of writing openshift-mtv or konveyor-forklift.

Module ID Convention

Module IDs must include the {context} suffix so the same module can be included in multiple contexts without ID collision:

[id="adding-source-provider_{context}"]
= Adding a source provider