bypass-lock for "list" and "info" to prevent errors from metrics

temporary workaround for borgbackup/borg#7255 as cache is still locked

src/metrics.py

@@ -1,6 +1,9 @@
 # pylint: disable=protected-access
 import json
+import os
 import subprocess
+from io import StringIO
+from functools import partial
 from typing import Any
 
 import arrow
@@ -69,11 +72,16 @@ def set_metric(
 
 
 def collect(borgmatic_configs: list, registry):
+    # temporary workaround for https://github.com/borgbackup/borg/issues/7255 to be used together with `--bypass-lock`
+    tmp_env=os.environ.copy()
+    tmp_env["HOME"]="/tmp/borgmatic-exporter-cache"
+    tmp_env["BORG_UNKNOWN_UNENCRYPTED_REPO_ACCESS_IS_OK"]="yes"
+
     borgmatic_configs = " -c ".join(borgmatic_configs)
     # Overall repo info and last archive only
-    repos = run_command(f"borgmatic info -c {borgmatic_configs} --json --last 1")
+    repos = run_command(f"borgmatic -c {borgmatic_configs} --verbosity -1 borg info --bypass-lock --json --last 1", tmp_env)
     # All archives
-    archives = run_command(f"borgmatic list -c {borgmatic_configs} --json")
+    archives = run_command(f"borgmatic -c {borgmatic_configs} --verbosity -1 borg list --bypass-lock --json", tmp_env)
 
     for r, a in zip(repos, archives):
         labels = {"repository": r["repository"]["location"]}
@@ -139,15 +147,39 @@ def collect(borgmatic_configs: list, registry):
             )
 
 
-def run_command(command: str) -> dict:
+# parse multiple json objects (not in array)
+def json_multi_parse(fileobj, decoder=json.JSONDecoder(), buffersize=2048):
+    """
+    Parses the content of the file object to json and yields every found valid json.
+    Can read valid json which is concatenated together (in combination not valid json).
+    """                             
+    buffer = ''                                                                                          
+    for chunk in iter(partial(fileobj.read, buffersize), ''):                                            
+         buffer += chunk                                                                                 
+         while buffer:                                                                                   
+             try:                                                                                        
+                 result, index = decoder.raw_decode(buffer)                                              
+                 yield result                                                                            
+                 buffer = buffer[index:].lstrip()                                                        
+             except ValueError:                                                                          
+                 # Not enough data to decode, read more                                                  
+                 break   
+
+
+def run_command(command: str, command_env) -> dict:
     """
     Execute command via the command line and load the output into dictionary.
     """
     with timy.Timer(command):
+        # temporary workaround for https://github.com/borgbackup/borg/issues/7255
+        tmp_env=os.environ.copy()
+        tmp_env["HOME"]="/tmp/borgmatic-exporter-cache"
+        tmp_env["BORG_UNKNOWN_UNENCRYPTED_REPO_ACCESS_IS_OK"]="yes"
         result = subprocess.run(
             command.split(" "),
             check=True,
             stdout=subprocess.PIPE,
+            env=command_env
         )
     output = result.stdout.decode("utf-8").strip()
-    return json.loads(output)
+    return list(json_multi_parse(StringIO(output)))