buildextend-live: fix bug when targeting older build
We weren't passing the build ID to `GenericBuildMeta`, so it was always
using the latest build even if targeting an older one.
@@ -73,7 +73,7 @@ if not os.path.isdir(srcdir_prefix):
workdir = os.path.abspath(os.getcwd())
builddir = builds.get_build_dir(args.build)
buildmeta_path = os.path.join(builddir, 'meta.json')
-buildmeta = GenericBuildMeta(workdir=workdir)
+buildmeta = GenericBuildMeta(workdir=workdir, build=args.build)
# used to lock
build_semaphore = os.path.join(buildmeta.build_dir, ".live.building")
