Add local_conda_mapping_file to schema

Purpose: let the config system load this just like any other path to a config file.
Update comment in sample file
Enable unit test
Run make config-rebuild.

doc/source/admin/galaxy_options.rst

@@ -474,6 +474,18 @@
 :Type: bool
 
 
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+``local_conda_mapping_file``
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+:Description:
+    Path to a file that provides a mapping from abstract packages to
+    concrete conda packages. See
+    `config/local_conda_mapping.yml.sample` for examples.
+:Default: ``local_conda_mapping.yml``
+:Type: str
+
+
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 ``use_cached_dependency_manager``
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

lib/galaxy/config/__init__.py

@@ -787,7 +787,6 @@ class GalaxyAppConfiguration(BaseAppConfiguration, CommonConfigurationMixin):
             build_sites_config_file=[self._in_config_dir('build_sites.yml'), self._in_sample_dir('build_sites.yml.sample')],
             datatypes_config_file=[self._in_config_dir('datatypes_conf.xml'), self._in_sample_dir('datatypes_conf.xml.sample')],
             job_metrics_config_file=[self._in_config_dir('job_metrics_conf.xml'), self._in_sample_dir('job_metrics_conf.xml.sample')],
-            local_conda_mapping_file=[self._in_config_dir('local_conda_mapping.yml')],
             modules_mapping_files=[self._in_config_dir('environment_modules_mapping.yml')],
         )
         listify_defaults = {

lib/galaxy/config/sample/galaxy.yml.sample

@@ -326,6 +326,11 @@ galaxy:
   # and extra time spent copying packages.
   #conda_copy_dependencies: false
 
+  # Path to a file that provides a mapping from abstract packages to
+  # concrete conda packages. See `config/local_conda_mapping.yml.sample`
+  # for examples.
+  #local_conda_mapping_file: local_conda_mapping.yml
+
   # Certain dependency resolvers (namely Conda) take a considerable
   # amount of time to build an isolated job environment in the
   # job_working_directory if the job working directory is on a network

lib/galaxy/config/sample/local_conda_mapping.yml.sample

@@ -1,2 +1,3 @@
-# See $GALAXY_ROOT/lib/galaxy/tools/deps/resolvers/default_conda_mapping.yml for example mapping - 
-# additional site-specific mappings can be added to config/local_conda_mapping.yml.
+# See $GALAXY_ROOT/lib/galaxy/tool_util/deps/resolvers/default_conda_mapping.yml for example mapping - 
+# additional site-specific mappings can be added to config/local_conda_mapping.yml (or the location
+# of <local_conda_mapping_file> specified in galaxy.yml).

lib/galaxy/webapps/galaxy/config_schema.yml

@@ -368,6 +368,15 @@ mapping:
           This will prevent problems with some specific packages (perl, R), at the cost
           of extra disk space usage and extra time spent copying packages.
 
+      local_conda_mapping_file:
+        type: str
+        default: 'local_conda_mapping.yml'
+        path_resolves_to: config_dir
+        required: false
+        desc: |
+          Path to a file that provides a mapping from abstract packages to concrete conda packages.
+          See `config/local_conda_mapping.yml.sample` for examples.
+
       use_cached_dependency_manager:
         type: bool
         default: false

test/unit/config/test_config_values.py

@@ -123,6 +123,7 @@ class ExpectedValues:
             'job_metrics_config_file': self._in_sample_dir('job_metrics_conf.xml.sample'),
             'job_resource_params_file': self._in_config_dir('job_resource_params_conf.xml'),
             'len_file_path': self._in_root_dir('tool-data/shared/ucsc/chrom'),
+            'local_conda_mapping_file': self._in_config_dir('local_conda_mapping.yml'),
             'managed_config_dir': self._in_managed_config_dir(),
             'markdown_export_css': self._in_config_dir('markdown_export.css'),
             'markdown_export_css_invocation_reports': self._in_config_dir('markdown_export_invocation_reports.css'),