qa/nvme_loop: fix an issue on ubuntu 18.04

The following command:

```
echo /dev/sda | tee /sys/kernel/config/nvmet/subsystems/sda/namespaces/1/device_path
```

makes nvme_loop fail because fascinatingly, it adds an unexpected newline.

See:
```
/dev/sda
/dev/sda

1
tee: /sys/kernel/config/nvmet/subsystems/sda/namespaces/1/enable: No such file or directory
/dev/sda
1
```

Other distros don't have the same behavior:

```
CentOS 8
/dev/sda
/dev/sda
1

Ubuntu 20.04
/dev/sda
/dev/sda
1
```

Signed-off-by: Guillaume Abrioux <gabrioux@redhat.com>

diff --git a/qa/tasks/nvme_loop.py b/qa/tasks/nvme_loop.py
index c4a027633343cbee68956902524ae87c768d6f52..1501ad636c8f550fb770634e87416d341c1de691 100644 (file)
--- a/qa/tasks/nvme_loop.py
+++ b/qa/tasks/nvme_loop.py
@@ -45,7 +45,7 @@ def task(ctx, config):
                     run.Raw('&&'),
                     'sudo', 'mkdir', '-p', f'{base}/subsystems/{short}/namespaces/1',
                     run.Raw('&&'),
-                    'echo', dev, run.Raw('|'),
+                    'echo', '-n', dev, run.Raw('|'),
                     'sudo', 'tee', f'{base}/subsystems/{short}/namespaces/1/device_path',
                     run.Raw('&&'),
                     'echo', '1', run.Raw('|'),