missing sources error message

conans/client/source.py

@@ -19,7 +19,8 @@ def complete_recipe_sources(remote_manager, cache, conanfile, ref, remotes):
     occassions, conan needs to get them too, like if uploading to a server, to keep the recipes
     complete
     """
-    sources_folder = cache.package_layout(ref, conanfile.short_paths).export_sources()
+    package_layout = cache.package_layout(ref, conanfile.short_paths)
+    sources_folder = package_layout.export_sources()
     if os.path.exists(sources_folder):
         return None
 
@@ -29,15 +30,23 @@ def complete_recipe_sources(remote_manager, cache, conanfile, ref, remotes):
 
     # If not path to sources exists, we have a problem, at least an empty folder
     # should be there
-    current_remote = cache.package_layout(ref).load_metadata().recipe.remote
+    current_remote = package_layout.load_metadata().recipe.remote
     if current_remote:
         current_remote = remotes[current_remote]
     if not current_remote:
-        raise ConanException("Error while trying to get recipe sources for %s. "
-                             "No remote defined" % str(ref))
+        msg = ("The '%s' package has 'exports_sources' but sources not found in local cache.\n"
+               "Probably it was installed from a remote that is no longer available.\n"
+               % str(ref))
+        raise ConanException(msg)
 
-    export_path = cache.package_layout(ref).export()
-    remote_manager.get_recipe_sources(ref, export_path, sources_folder, current_remote)
+    export_path = package_layout.export()
+    try:
+        remote_manager.get_recipe_sources(ref, export_path, sources_folder, current_remote)
+    except Exception as e:
+        msg = ("The '%s' package has 'exports_sources' but sources not found in local cache.\n"
+               "Probably it was installed from a remote that is no longer available.\n"
+               % str(ref))
+        raise ConanException("\n".join([str(e), msg]))
 
 
 def config_source_local(src_folder, conanfile, conanfile_path, hook_manager):

conans/test/functional/conan_api/config_test.py

@@ -0,0 +1,19 @@
+import unittest
+
+from conans.client import conan_api
+
+
+class ConfigTest(unittest.TestCase):
+
+    def setUp(self):
+        self.api, _, _ = conan_api.ConanAPIV1.factory()
+
+    def config_rm_test(self):
+        self.api.config_set("proxies.https", "http://10.10.1.10:1080")
+        self.assertIn("proxies", self.api.app.config.sections())
+        self.api.config_rm('proxies')
+        self.assertNotIn("proxies", self.api.app.config.sections())
+
+    def test_config_home(self):
+        conan_home = self.api.config_home()
+        self.assertEqual(self.api.cache_folder, conan_home)

conans/test/functional/remote/multi_remote_test.py

@@ -1,3 +1,4 @@
+import textwrap
 import time
 import unittest
 from collections import OrderedDict
@@ -9,6 +10,44 @@
 from conans.test.utils.tools import TestClient, TestServer
 
 
+class ExportsSourcesMissingTest(unittest.TestCase):
+
+    def exports_sources_missing_test(self):
+        client = TestClient(default_server_user=True)
+        conanfile = textwrap.dedent("""
+            from conans import ConanFile
+            class Pkg(ConanFile):
+                exports_sources = "*"
+            """)
+        client.save({"conanfile.py": conanfile,
+                     "source.txt": "somesource"})
+        client.run("create . pkg/0.1@user/testing")
+        client.run("upload pkg/0.1@user/testing --all")
+
+        # Failure because remote is removed
+        servers = OrderedDict(client.servers)
+        servers["new_server"] = TestServer(users={"user": "password"})
+        client2 = TestClient(servers=servers, users={"new_server": [("user", "password")]})
+        client2.run("install pkg/0.1@user/testing")
+        client2.run("remote remove default")
+        client2.run("upload pkg/0.1@user/testing --all -r=new_server", assert_error=True)
+        self.assertIn("The 'pkg/0.1@user/testing' package has 'exports_sources' but sources "
+                      "not found in local cache.", client2.out)
+        self.assertIn("Probably it was installed from a remote that is no longer available.",
+                      client2.out)
+
+        # Failure because remote is disconnected
+        client2 = TestClient(servers=servers, users={"new_server": [("user", "password")]})
+        client2.run("install pkg/0.1@user/testing")
+        client2.run("remote add default http://someweird__conan_URL -f")
+        client2.run("upload pkg/0.1@user/testing --all -r=new_server", assert_error=True)
+        self.assertIn("Unable to connect to default=http://someweird__conan_URL", client2.out)
+        self.assertIn("The 'pkg/0.1@user/testing' package has 'exports_sources' but sources "
+                      "not found in local cache.", client2.out)
+        self.assertIn("Probably it was installed from a remote that is no longer available.",
+                      client2.out)
+
+
 class MultiRemotesTest(unittest.TestCase):
 
     def setUp(self):