Try to show smarter / more useful logs by filtering irrelevant lines like 'set +x' etc

data/actionsmap/yunohost.yml

@@ -1659,6 +1659,10 @@ log:
                 --share:
                     help: Share the full log using yunopaste
                     action: store_true
+                -f:
+                    full: --filter-irrelevant
+                    help: Do not show some lines deemed not relevant (like set +x or helper argument parsing)
+                    action: store_true
 
 
 #############################

src/yunohost/app.py

@@ -914,6 +914,19 @@ def dump_app_log_extract_for_debugging(operation_logger):
     with open(operation_logger.log_path, "r") as f:
         lines = f.readlines()
 
+    filters = [
+        r"set [+-]x$",
+        r"local \w+$",
+        r"local legacy_args=.*$",
+        r".*Helper used in legacy mode.*",
+        r"args_array=.*$",
+        r"declare -Ar args_array$",
+        r"ynh_handle_getopts_args",
+        r"ynh_script_progression"
+    ]
+
+    filters = [re.compile(f) for f in filters]
+
     lines_to_display = []
     for line in lines:
 
@@ -924,6 +937,10 @@ def dump_app_log_extract_for_debugging(operation_logger):
         # 2019-10-19 16:10:27,611: DEBUG - + mysql -u piwigo --password=********** -B piwigo
         # And we just want the part starting by "DEBUG - "
         line = line.strip().split(": ", 1)[1]
+
+        if any(filter_.search(line) for filter_ in filters):
+            continue
+
         lines_to_display.append(line)
 
         if line.endswith("+ ynh_exit_properly") or " + ynh_die " in line:

src/yunohost/log.py

@@ -122,7 +122,7 @@ def log_list(category=[], limit=None, with_details=False):
     return result
 
 
-def log_display(path, number=None, share=False):
+def log_display(path, number=None, share=False, filter_irrelevant=False):
     """
     Display a log file enriched with metadata if any.
 
@@ -202,9 +202,24 @@ def log_display(path, number=None, share=False):
 
     # Display logs if exist
     if os.path.exists(log_path):
+
+        if filter_irrelevant:
+            filters = [
+                r"set [+-]x$",
+                r"local \w+$",
+                r"local legacy_args=.*$",
+                r".*Helper used in legacy mode.*",
+                r"args_array=.*$",
+                r"declare -Ar args_array$",
+                r"ynh_handle_getopts_args",
+                r"ynh_script_progression"
+            ]
+        else:
+            filters = []
+
         from yunohost.service import _tail
         if number:
-            logs = _tail(log_path, int(number))
+            logs = _tail(log_path, int(number), filters=filters)
         else:
             logs = read_file(log_path)
         infos['log_path'] = log_path

src/yunohost/service.py

@@ -23,6 +23,8 @@
 
     Manage services
 """
+
+import re
 import os
 import re
 import time
@@ -616,7 +618,7 @@ def _save_services(services):
         raise
 
 
-def _tail(file, n):
+def _tail(file, n, filters=[]):
     """
     Reads a n lines from f with an offset of offset lines.  The return
     value is a tuple in the form ``(lines, has_more)`` where `has_more` is
@@ -627,6 +629,9 @@ def _tail(file, n):
     avg_line_length = 74
     to_read = n
 
+    if filters:
+        filters = [re.compile(f) for f in filters]
+
     try:
         if file.endswith(".gz"):
             import gzip
@@ -647,6 +652,9 @@ def _tail(file, n):
                 pos = f.tell()
                 lines = f.read().splitlines()
 
+                for filter_ in filters:
+                    lines = [l for l in lines if not filter_.search(l)]
+
                 if len(lines) >= to_read:
                     return lines[-to_read:]