config: promote versionary key, rework it

The versionary FCOS script was one of the few things that differed
between FCOS and RHCOS and was awkwardly attached as a hack knob to
work.

Now, we promote it to a proper key under the `misc` section, with
support for stream-level overrides. This is prep for also using a
versionary in other streams.

The versionary is now part of the source config and cosa knows how to
execute it if the `--versionary` argument is passed.

config.yaml

@@ -48,8 +48,6 @@ registry_repos:
     repo: quay.io/fedora/fedora-coreos-kubevirt
     tags: ["${STREAM}"]
 
-versionary_hack: true
-
 default_artifacts:
   all:
     - metal
@@ -112,5 +110,6 @@ clouds:
     test_architectures: [x86_64, aarch64]
 
 misc:
+  versionary: true
   generate_release_index: true
   run_extended_upgrade_test_fcos: true

docs/config.yaml

@@ -37,9 +37,6 @@ hacks:
   # OPTIONAL: skip UEFI on older RHCOS
   skip_uefi_tests_on_older_rhcos: true
 
-# OPTIONAL/TEMPORARY: whether to use `versionary` to derive version numbers
-versionary_hack: true
-
 # OPTIONAL: coreos-assembler image to build with. Supports ${STREAM} variable.
 # If unset, defaults to `quay.io/coreos-assembler/coreos-assembler:main`.
 cosa_img: quay.io/jlebon/coreos-assembler:pr3139-${STREAM}
@@ -60,6 +57,8 @@ streams:
       source_config_ref: main
       # OPTIONAL: override OS variant to use for this stream
       variant: rhcos-9.0
+      # OPTIONAL: override whether to use a versionary for this stream
+      versionary: false
     stable:
       type: production
       # OPTIONAL: override cosa image to use for this stream
@@ -274,6 +273,8 @@ clouds:
 
 # OPTIONAL: miscellaneous options
 misc:
+  # OPTIONAL: whether to use a versionary to derive version numbers
+  versionary: true
   # OPTIONAL: whether to generate a release index
   generate_release_index: true
   # OPTIONAL: whether to run extended upgrade test kola job

jobs/build.Jenkinsfile

@@ -250,13 +250,6 @@ lock(resource: "build-${params.STREAM}") {
             prevBuildID = shwrapCapture("readlink builds/latest")
         }
 
-        def new_version = ""
-        if (params.VERSION) {
-            new_version = params.VERSION
-        } else if (pipecfg.versionary_hack) {
-            new_version = shwrapCapture("/usr/lib/coreos-assembler/fcos-versionary")
-        }
-
         def overrides_fetch_param = ""
 
         // fetch from repos for the current build
@@ -274,10 +267,22 @@ lock(resource: "build-${params.STREAM}") {
             if (parent_version != "") {
                 parent_arg = "--parent-build ${parent_version}"
             }
-            def version = new_version ? "--version ${new_version}" : ""
+            def version_arg = ""
+            if (params.VERSION) {
+                version_arg = "--version ${params.VERSION}"
+            } else {
+                def use_versionary = pipecfg.misc?.versionary
+                if (stream_info.containsKey('versionary')) {
+                    // stream override always wins
+                    use_versionary = stream_info.versionary
+                }
+                if (use_versionary) {
+                    version_arg = "--versionary"
+                }
+            }
             def force = params.FORCE ? "--force" : ""
             shwrap("""
-            cosa build ostree ${strict_build_param} --skip-prune ${force} ${version} ${parent_arg}
+            cosa build ostree ${strict_build_param} --skip-prune ${force} ${version_arg} ${parent_arg}
             """)
 
             // Insert the parent info into meta.json so we can display it in