fix: Pass pkg_format to container-based build (#994)

This way we should be able to switch to `pkg_format: 2` (i.e., build
`.conda` packages) via config from `bioconda-common`.

Signed-off-by: Marcel Bargull <marcel.bargull@udo.edu>

bioconda_utils/docker_utils.py

@@ -105,6 +105,9 @@
     grep -vF "Warning: 'file://{self.container_staging}' already in 'channels' list, moving to the top" >&2
 )
 
+# Pass on conda_pkg_format ("2" for .conda instead of .tar.bz2) from host's conda-build config.
+test -n '{self.conda_pkg_format}' && conda config --set conda_build.pkg_format '{self.conda_pkg_format}'
+
 # The actual building...
 # we explicitly point to the meta.yaml, in order to keep
 # conda-build from building all subdirectories
@@ -155,18 +158,6 @@ class DockerBuildError(Exception):
 
 
 
-def get_host_conda_bld():
-    """
-    Identifies the conda-bld directory on the host.
-
-    Assumes that conda-build is installed.
-    """
-    # v0.16.2: this used to have a side effect, calling conda build purge
-    # hopefully, it's not actually needed.
-    build_conf = utils.load_conda_build_config()
-    return build_conf.build_folder
-
-
 class RecipeBuilder(object):
     def __init__(
         self,
@@ -286,7 +277,11 @@ def __init__(
         self.container_recipe = container_recipe
         self.container_staging = container_staging
 
-        self.host_conda_bld = get_host_conda_bld()
+        conda_build_config = utils.load_conda_build_config()
+        # Identify conda-bld directory on the host.
+        self.host_conda_bld = conda_build_config.croot
+        # Pass on config to choose wheter to build .tar.bz2 or .conda format.
+        self.conda_pkg_format = conda_build_config.conda_pkg_format or ""
 
         if use_host_conda_bld:
             self.pkg_dir = self.host_conda_bld

test/test_utils.py

@@ -1291,18 +1291,9 @@ def test_pkg_test_conda_package_format(
     r.write_recipes()
     docker_builder = None
     if mulled_test:
-        # Override conda_build.pkg_format in build_script_template.
-        build_script_template = re.sub(
-            "^(conda config.*)",
-            f"conda config --set conda_build.pkg_format {pkg_format}\n\\1",
-            docker_utils.BUILD_SCRIPT_TEMPLATE,
-            count=1,
-            flags=re.M,
-        )
         docker_builder = docker_utils.RecipeBuilder(
             use_host_conda_bld=True,
             docker_base_image=DOCKER_BASE_IMAGE,
-            build_script_template=build_script_template,
         )
     build_result = build.build_recipes(
         r.basedir,