utils: rename cache_probe() to get_cache_dev_path()

This method reports the /dev path to cache partition, rename it.

Add explicit check if blkid is successful.

And add logging to report that device path to cache is not found.

1 files changed, 7 insertions, 4 deletions

diff --git a/src/utils/probe.py b/src/utils/probe.py
index 8c0e39a..b2ed5de 100644
--- a/src/utils/probe.py
+++ b/src/utils/probe.py
@@ -135,14 +135,17 @@ def get_linux_distro_id(mountpoint):
         logging.error(f'os-release file not found at "{osrelease}"')
     return 'linux'
 
-def cache_probe():
+def get_cache_dev_path():
     """
-    Runs 'blkid -L CACHE' and returns stripped stdout
+    Runs 'blkid -L CACHE' and returns stripped path to device, eg. /dev/sda3
     """
     proc_blkid = subprocess.run(['blkid', '-L', 'CACHE'],
                                 stdout=subprocess.PIPE)
-    stdout = proc_blkid.stdout.decode().strip()
-    return stdout
+    if proc_blkid.returncode != 0:
+        logging.error('Cannot find device path to cache')
+        return ''
+
+    return proc_blkid.stdout.decode().strip()
 
 
 def get_os_family(mountpoint):