Using /var/log/daemon.log or /var/log/syslog is pointless, these files logs many different things. Instead, we shall always return the logs from journalctl

data/hooks/conf_regen/01-yunohost

@@ -101,6 +101,12 @@ for service, conf in new_services.items():
         if conffiles:
             services[service]['conffiles'] = conffiles
 
+        # Remove legacy /var/log/daemon.log and /var/log/syslog from log entries
+        # because they are too general. Instead, now the journalctl log is
+        # returned by default which is more relevant.
+        if "log" in services[service]:
+            if services[service]["log"] in ["/var/log/syslog", "/var/log/daemon.log"]:
+                del services[service]["log"]
 
 if updated:
     with open('/etc/yunohost/services.yml-new', 'w') as f:

data/templates/yunohost/services.yml

@@ -2,10 +2,8 @@ nginx:
   log: /var/log/nginx
   test_conf: nginx -t
   needs_exposed_ports: [80, 443]
-avahi-daemon:
-  log: /var/log/daemon.log
-dnsmasq:
-  log: /var/log/daemon.log
+avahi-daemon: {}
+dnsmasq: {}
 fail2ban:
   log: /var/log/fail2ban.log
 dovecot:
@@ -29,8 +27,7 @@ ssh:
 metronome:
   log: [/var/log/metronome/metronome.log,/var/log/metronome/metronome.err]
   needs_exposed_ports: [5222, 5269]
-slapd:
-  log: /var/log/syslog
+slapd: {}
 php7.0-fpm:
   log: /var/log/php7.0-fpm.log
   test_conf: php-fpm7.0 --test
@@ -39,8 +36,7 @@ yunohost-api:
 yunohost-firewall:
   need_lock: true
   test_status: iptables -S | grep "^-A INPUT" | grep " --dport" | grep -q ACCEPT
-nslcd:
-  log: /var/log/syslog
+nslcd: {}
 glances: null
 nsswitch: null
 ssl: null

locales/en.json

@@ -544,7 +544,6 @@
     "service_disabled": "The '{service:s}' service was turned off",
     "service_enable_failed": "Could not turn on the service '{service:s}'\n\nRecent service logs:{logs:s}",
     "service_enabled": "The '{service:s}' service was turned off",
-    "service_no_log": "No logs to display for the service '{service:s}'",
     "service_regen_conf_is_deprecated": "'yunohost service regen-conf' is deprecated! Please use 'yunohost tools regen-conf' instead.",
     "service_remove_failed": "Could not remove the service '{service:s}'",
     "service_removed": "'{service:s}' service removed",

src/yunohost/service.py

@@ -395,10 +395,7 @@ def service_log(name, number=50):
     if name not in services.keys():
         raise YunohostError('service_unknown', service=name)
 
-    if 'log' not in services[name]:
-        raise YunohostError('service_no_log', service=name)
-
-    log_list = services[name]['log']
+    log_list = services[name].get('log', [])
     log_type_list = services[name].get('log_type', [])
 
     if not isinstance(log_list, list):
@@ -408,6 +405,9 @@ def service_log(name, number=50):
 
     result = {}
 
+    # First we always add the logs from journalctl / systemd
+    result["journalctl"] = _get_journalctl_logs(name, int(number)).splitlines()
+
     for index, log_path in enumerate(log_list):
         log_type = log_type_list[index]