[Buildroot] [PATCH 2/2] support/testing: add runtime tests for python-scp

["Alexis Lothoré via buildroot" <buildroot@buildroot.org>]

Add a basic test involving a local SSH connection (based on dropbear
server). The test validates that we are able, through python-scp, to
fetch the /etc/hostname file.

The test needs some basic key initialization to allow connecting to the
dropbear server, hence the custom run_sample_scripts method.

Signed-off-by: Alexis Lothoré <alexis.lothore@bootlin.com>
---
 support/testing/tests/package/sample_python_scp.py | 10 +++++++++
 support/testing/tests/package/test_python_scp.py   | 24 ++++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/support/testing/tests/package/sample_python_scp.py b/support/testing/tests/package/sample_python_scp.py
new file mode 100644
index 0000000000000000000000000000000000000000..fdb4b720a9e6346a650e6d90120c598af9f2988d
--- /dev/null
+++ b/support/testing/tests/package/sample_python_scp.py
@@ -0,0 +1,10 @@
+from paramiko import SSHClient
+from paramiko.client import AutoAddPolicy
+from scp import SCPClient
+
+ssh_client = SSHClient()
+ssh_client.load_system_host_keys()
+ssh_client.set_missing_host_key_policy(AutoAddPolicy)
+ssh_client.connect('127.0.0.1', username='root')
+scp_client = SCPClient(ssh_client.get_transport())
+scp_client.get("/etc/hostname", "/tmp/hostname")
diff --git a/support/testing/tests/package/test_python_scp.py b/support/testing/tests/package/test_python_scp.py
new file mode 100644
index 0000000000000000000000000000000000000000..2cb4f1e67e6e74c643167f4c621e18895d36e6f6
--- /dev/null
+++ b/support/testing/tests/package/test_python_scp.py
@@ -0,0 +1,24 @@
+import os
+from tests.package.test_python import TestPythonPackageBase
+
+
+class TestPythonSCP(TestPythonPackageBase):
+    __test__ = True
+    config = TestPythonPackageBase.config + \
+        """
+        BR2_PACKAGE_DROPBEAR=y
+        BR2_PACKAGE_PYTHON3=y
+        BR2_PACKAGE_PYTHON_SCP=y
+        """
+    sample_scripts = ["tests/package/sample_python_scp.py"]
+
+    def run_sample_scripts(self):
+        # Allow passwordless root login in SSH server
+        output, exit_code = self.emulator.run('mkdir /root/.ssh')
+        output, exit_code = self.emulator.run('dropbearkey -t ed25519 -f .ssh/id_dropbear')
+        output, exit_code = self.emulator.run('dropbearkey -y -f .ssh/id_dropbear|grep "^ssh-ed25519" > .ssh/authorized_keys')
+        output, exit_code = self.emulator.run('dropbearconvert dropbear openssh .ssh/id_dropbear .ssh/id_ed25519')
+
+        for script in self.sample_scripts:
+            cmd = self.interpreter + " " + os.path.basename(script)
+            self.assertRunOk(cmd, timeout=self.timeout)

-- 
2.51.0

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