[Buildroot] [git commit branch/2025.05.x] support/testing: use again the default BR2_BACKUP_SITE

[Thomas Perale]

commit: https://git.buildroot.net/buildroot/commit/?id=16b2636aab4e884a1224919fccadb56beee648e3
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2025.05.x

This reverts commit 559bb33ae71dd2358ca2314ccb24b56cc3809fc1, which
was disabling BR2_BACKUP_SITE in our tests with the following
reasoning:

    support/testing: do not use s.b.o

    Currently, the runtime tests will use the sources.buildroot.org backup
    mirror, which is the default setup.

    However, in some cases we do not want to use the backup site, because we
    want to ensure that the download actually works.

    This is the case for vendored packages, like cargo or golang packages,
    for whbich we want to check that gthe download still works when we
    update the rust or go versions, or when our download helpers change.

    So, disable the use of the backup site in all runtime tests, and drop
    the no-longer needed special cases.

    Signed-off-by: Yann E. MORIN <yann.morin.1998 at free.fr>
    Cc: Thomas Petazzoni <thomas.petazzoni at bootlin.com>

However, not using the backup site is causing a LOT of random failures
in Gitlab CI, making the results barely usable. Since it's more
important to get real failures than random ones due to download
issues, let's re-enable BR2_BACKUP_SITE in our testing infrastructure.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni at bootlin.com>
Signed-off-by: Romain Naour <romain.naour at smile.fr>
(cherry picked from commit d26f3717588cfec10ab8572aa5ffa0a8ae471341)
Signed-off-by: Thomas Perale <thomas.perale at mind.be>
---
 support/testing/infra/basetest.py               | 1 -
 support/testing/tests/download/test_git.py      | 5 ++++-
 support/testing/tests/download/test_gitforge.py | 5 ++++-
 support/testing/tests/download/test_ssh.py      | 4 +++-
 support/testing/tests/package/test_rust.py      | 1 +
 5 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/support/testing/infra/basetest.py b/support/testing/infra/basetest.py
index 4f020e8a93..9fb9dffc53 100644
--- a/support/testing/infra/basetest.py
+++ b/support/testing/infra/basetest.py
@@ -37,7 +37,6 @@ class BRConfigTest(unittest.TestCase):
         super(BRConfigTest, self).__init__(names)
         self.testname = self.__class__.__name__
         self.builddir = self.outputdir and os.path.join(self.outputdir, self.testname)
-        self.config += '\nBR2_BACKUP_SITE=""\n'
         self.config += '\nBR2_DL_DIR="{}"\n'.format(self.downloaddir)
         self.config += "\nBR2_JLEVEL={}\n".format(self.jlevel)
 
diff --git a/support/testing/tests/download/test_git.py b/support/testing/tests/download/test_git.py
index 3cf98f6456..ba52e03ef5 100644
--- a/support/testing/tests/download/test_git.py
+++ b/support/testing/tests/download/test_git.py
@@ -7,7 +7,10 @@ import infra
 
 
 class GitTestBase(infra.basetest.BRConfigTest):
-    config = ""
+    config = \
+        """
+        BR2_BACKUP_SITE=""
+        """
     gitremotedir = infra.filepath("tests/download/git-remote")
     gitremote = None
 
diff --git a/support/testing/tests/download/test_gitforge.py b/support/testing/tests/download/test_gitforge.py
index 477c365a34..e1ac35ec67 100644
--- a/support/testing/tests/download/test_gitforge.py
+++ b/support/testing/tests/download/test_gitforge.py
@@ -5,7 +5,10 @@ import infra
 
 
 class GitforgeTestBase(infra.basetest.BRConfigTest):
-    config = ""
+    config = \
+        """
+        BR2_BACKUP_SITE=""
+        """
 
     def setUp(self):
         super(GitforgeTestBase, self).setUp()
diff --git a/support/testing/tests/download/test_ssh.py b/support/testing/tests/download/test_ssh.py
index 7d6ac3aaf7..126002a355 100644
--- a/support/testing/tests/download/test_ssh.py
+++ b/support/testing/tests/download/test_ssh.py
@@ -7,7 +7,9 @@ import infra
 
 
 class SSHTestBase(infra.basetest.BRConfigTest):
-    config = infra.basetest.MINIMAL_CONFIG
+    config = infra.basetest.MINIMAL_CONFIG + '''
+BR2_BACKUP_SITE=""
+'''
     sshd_test_dir = infra.filepath("tests/download/sshd")
     sshd = None
 
diff --git a/support/testing/tests/package/test_rust.py b/support/testing/tests/package/test_rust.py
index 8160cb6053..763125ca20 100644
--- a/support/testing/tests/package/test_rust.py
+++ b/support/testing/tests/package/test_rust.py
@@ -70,6 +70,7 @@ class TestRustVendoring(infra.basetest.BRConfigTest):
         BR2_PACKAGE_RIPGREP=y
         BR2_PACKAGE_PYTHON3=y
         BR2_PACKAGE_PYTHON_CRYPTOGRAPHY=y
+        BR2_BACKUP_SITE=""
         """
 
     def setUp(self):