feat(datasource/conda): support custom registries (#17809)

lib/modules/datasource/conda/__snapshots__/index.spec.ts.snap

@@ -3,7 +3,7 @@
 exports[`modules/datasource/conda/index getReleases processes real data 1`] = `
 {
   "homepage": "http://anaconda.org/anaconda/pytest",
-  "registryUrl": "https://api.anaconda.org/package/",
+  "registryUrl": "https://api.anaconda.org/package",
   "releases": [
     {
       "version": "2.3.3",

lib/modules/datasource/conda/index.spec.ts

@@ -3,6 +3,7 @@ import { Fixtures } from '../../../../test/fixtures';
 import * as httpMock from '../../../../test/http-mock';
 import { EXTERNAL_HOST_ERROR } from '../../../constants/error-messages';
 import { datasource, defaultRegistryUrl } from './common';
+import { CondaDatasource } from './index';
 
 const depName = 'main/pytest';
 const depUrl = `/${depName}`;
@@ -61,5 +62,52 @@ describe('modules/datasource/conda/index', () => {
       expect(res).toMatchSnapshot();
       expect(res?.releases).toHaveLength(94);
     });
+
+    it('returns null without registryUrl', async () => {
+      const condaDatasource = new CondaDatasource();
+      const res = await condaDatasource.getReleases({
+        registryUrl: '',
+        packageName: depName,
+      });
+      expect(res).toBeNull();
+    });
+
+    it('supports multiple custom datasource urls', async () => {
+      const depName = 'pytest';
+      httpMock
+        .scope('https://api.anaconda.org/package/rapids')
+        .get(`/${depName}`)
+        .reply(404);
+      httpMock
+        .scope('https://api.anaconda.org/package/conda-forge')
+        .get(`/${depName}`)
+        .reply(200, {
+          html_url: 'http://anaconda.org/anaconda/pytest',
+          dev_url: 'https://github.com/pytest-dev/pytest/',
+          versions: ['2.7.0', '2.5.1', '2.6.0'],
+        });
+      const config = {
+        registryUrls: [
+          'https://api.anaconda.org/package/rapids',
+          'https://api.anaconda.org/package/conda-forge',
+          'https://api.anaconda.org/package/nvidia',
+        ],
+      };
+      const res = await getPkgReleases({
+        ...config,
+        datasource,
+        depName,
+      });
+      expect(res).toMatchObject({
+        homepage: 'http://anaconda.org/anaconda/pytest',
+        registryUrl: 'https://api.anaconda.org/package/conda-forge',
+        releases: [
+          { version: '2.5.1' },
+          { version: '2.6.0' },
+          { version: '2.7.0' },
+        ],
+        sourceUrl: 'https://github.com/pytest-dev/pytest',
+      });
+    });
   });
 });

lib/modules/datasource/conda/index.ts

@@ -2,6 +2,7 @@ import { logger } from '../../../logger';
 import { ExternalHostError } from '../../../types/errors/external-host-error';
 import { cache } from '../../../util/cache/package/decorator';
 import { HttpError } from '../../../util/http';
+import { joinUrlParts } from '../../../util/url';
 import { Datasource } from '../datasource';
 import type { GetReleasesConfig, Release, ReleaseResult } from '../types';
 import { datasource, defaultRegistryUrl } from './common';
@@ -14,7 +15,9 @@ export class CondaDatasource extends Datasource {
     super(datasource);
   }
 
-  override readonly customRegistrySupport = false;
+  override readonly customRegistrySupport = true;
+
+  override readonly registryStrategy = 'hunt';
 
   override readonly defaultRegistryUrls = [defaultRegistryUrl];
 
@@ -33,9 +36,11 @@ export class CondaDatasource extends Datasource {
   }: GetReleasesConfig): Promise<ReleaseResult | null> {
     logger.trace({ registryUrl, packageName }, 'fetching conda package');
 
-    // TODO: types (#7154)
-    // eslint-disable-next-line @typescript-eslint/restrict-template-expressions
-    const url = `${registryUrl}${packageName}`;
+    if (!registryUrl) {
+      return null;
+    }
+
+    const url = joinUrlParts(registryUrl, packageName);
 
     const result: ReleaseResult = {
       releases: [],