Trying to fix some lgtm warnings

src/yunohost/app.py

@@ -627,7 +627,7 @@ def app_upgrade(app=[], url=None, file=None, force=False, no_safety_backup=False
             if upgrade_failed or broke_the_system:
 
                 # display this if there are remaining apps
-                if apps[number + 1 :]:
+                if apps[number + 1:]:
                     not_upgraded_apps = apps[number:]
                     logger.error(
                         m18n.n(
@@ -1626,9 +1626,12 @@ class AppConfigPanel(ConfigPanel):
                     error=message,
                 )
 
-    def _call_config_script(self, action, env={}):
+    def _call_config_script(self, action, env=None):
         from yunohost.hook import hook_exec
 
+        if env is None:
+            env = {}
+
         # Add default config script if needed
         config_script = os.path.join(
             APPS_SETTING_PATH, self.entity, "scripts", "config"

src/yunohost/certificate.py

@@ -70,28 +70,28 @@ PRODUCTION_CERTIFICATION_AUTHORITY = "https://acme-v02.api.letsencrypt.org"
 #
 
 
-def certificate_status(domain_list, full=False):
+def certificate_status(domains, full=False):
     """
     Print the status of certificate for given domains (all by default)
 
     Keyword argument:
-        domain_list -- Domains to be checked
+        domains     -- Domains to be checked
         full        -- Display more info about the certificates
     """
 
-    import yunohost.domain
+    from yunohost.domain import domain_list, _assert_domain_exists
 
     # If no domains given, consider all yunohost domains
-    if domain_list == []:
-        domain_list = yunohost.domain.domain_list()["domains"]
+    if domains == []:
+        domains = domain_list()["domains"]
     # Else, validate that yunohost knows the domains given
     else:
-        for domain in domain_list:
-            yunohost.domain._assert_domain_exists(domain)
+        for domain in domains:
+            _assert_domain_exists(domain)
 
     certificates = {}
 
-    for domain in domain_list:
+    for domain in domains:
         status = _get_status(domain)
 
         if not full:
@@ -239,28 +239,28 @@ def _certificate_install_selfsigned(domain_list, force=False):
 
 
 def _certificate_install_letsencrypt(
-    domain_list, force=False, no_checks=False, staging=False
+    domains, force=False, no_checks=False, staging=False
 ):
-    import yunohost.domain
+    from yunohost.domain import domain_list, _assert_domain_exists
 
     if not os.path.exists(ACCOUNT_KEY_FILE):
         _generate_account_key()
 
     # If no domains given, consider all yunohost domains with self-signed
     # certificates
-    if domain_list == []:
-        for domain in yunohost.domain.domain_list()["domains"]:
+    if domains == []:
+        for domain in domain_list()["domains"]:
 
             status = _get_status(domain)
             if status["CA_type"]["code"] != "self-signed":
                 continue
 
-            domain_list.append(domain)
+            domains.append(domain)
 
     # Else, validate that yunohost knows the domains given
     else:
-        for domain in domain_list:
-            yunohost.domain._assert_domain_exists(domain)
+        for domain in domains:
+            _assert_domain_exists(domain)
 
             # Is it self-signed?
             status = _get_status(domain)
@@ -275,7 +275,7 @@ def _certificate_install_letsencrypt(
         )
 
     # Actual install steps
-    for domain in domain_list:
+    for domain in domains:
 
         if not no_checks:
             try:
@@ -311,25 +311,25 @@ def _certificate_install_letsencrypt(
 
 
 def certificate_renew(
-    domain_list, force=False, no_checks=False, email=False, staging=False
+    domains, force=False, no_checks=False, email=False, staging=False
 ):
     """
     Renew Let's Encrypt certificate for given domains (all by default)
 
     Keyword argument:
-        domain_list -- Domains for which to renew the certificates
+        domains    -- Domains for which to renew the certificates
         force      -- Ignore the validity threshold (15 days)
         no-check   -- Disable some checks about the reachability of web server
                       before attempting the renewing
         email      -- Emails root if some renewing failed
     """
 
-    import yunohost.domain
+    from yunohost.domain import domain_list, _assert_domain_exists
 
     # If no domains given, consider all yunohost domains with Let's Encrypt
     # certificates
-    if domain_list == []:
-        for domain in yunohost.domain.domain_list()["domains"]:
+    if domains == []:
+        for domain in domain_list()["domains"]:
 
             # Does it have a Let's Encrypt cert?
             status = _get_status(domain)
@@ -347,17 +347,17 @@ def certificate_renew(
                 )
                 continue
 
-            domain_list.append(domain)
+            domains.append(domain)
 
-        if len(domain_list) == 0 and not email:
+        if len(domains) == 0 and not email:
             logger.info("No certificate needs to be renewed.")
 
     # Else, validate the domain list given
     else:
-        for domain in domain_list:
+        for domain in domains:
 
             # Is it in Yunohost domain list?
-            yunohost.domain._assert_domain_exists(domain)
+            _assert_domain_exists(domain)
 
             status = _get_status(domain)
 
@@ -385,7 +385,7 @@ def certificate_renew(
         )
 
     # Actual renew steps
-    for domain in domain_list:
+    for domain in domains:
 
         if not no_checks:
             try:

src/yunohost/data_migrations/0018_xtable_to_nftable.py

@@ -41,7 +41,8 @@ class MyMigration(Migration):
             )  # For some reason if we don't do this, iptables-legacy-save is empty ?
             self.runcmd("iptables-legacy-save > %s" % self.backup_rules_ipv4)
             assert (
-                open(self.backup_rules_ipv4).read().strip()
+                os.path.exists(self.backup_rules_ipv4) and
+                os.stat(self.backup_rules_ipv4).st_size > 0
             ), "Uhoh backup of legacy ipv4 rules is empty !?"
         if self.do_ipv6 and not os.path.exists(self.backup_rules_ipv6):
             self.runcmd(
@@ -49,7 +50,8 @@ class MyMigration(Migration):
             )  # For some reason if we don't do this, iptables-legacy-save is empty ?
             self.runcmd("ip6tables-legacy-save > %s" % self.backup_rules_ipv6)
             assert (
-                open(self.backup_rules_ipv6).read().strip()
+                os.path.exists(self.backup_rules_ipv6) and 
+                os.stat(self.backup_rules_ipv6).st_size > 0
             ), "Uhoh backup of legacy ipv6 rules is empty !?"
 
         # We inject the legacy rules (iptables-legacy) into the new iptable (just "iptables")

src/yunohost/domain.py

@@ -507,17 +507,17 @@ def _set_domain_settings(domain: str, settings: dict) -> None:
 
 
 def domain_cert_status(domain_list, full=False):
-    import yunohost.certificate
+    from yunohost.certificate import certificate_status
 
-    return yunohost.certificate.certificate_status(domain_list, full)
+    return certificate_status(domain_list, full)
 
 
 def domain_cert_install(
     domain_list, force=False, no_checks=False, self_signed=False, staging=False
 ):
-    import yunohost.certificate
+    from yunohost.certificate import certificate_install
 
-    return yunohost.certificate.certificate_install(
+    return certificate_install(
         domain_list, force, no_checks, self_signed, staging
     )
 
@@ -525,9 +525,9 @@ def domain_cert_install(
 def domain_cert_renew(
     domain_list, force=False, no_checks=False, email=False, staging=False
 ):
-    import yunohost.certificate
+    from yunohost.certificate import certificate_renew
 
-    return yunohost.certificate.certificate_renew(
+    return certificate_renew(
         domain_list, force, no_checks, email, staging
     )
 
@@ -537,12 +537,12 @@ def domain_dns_conf(domain):
 
 
 def domain_dns_suggest(domain):
-    import yunohost.dns
+    from yunohost.dns import domain_dns_suggest
 
-    return yunohost.dns.domain_dns_suggest(domain)
+    return domain_dns_suggest(domain)
 
 
 def domain_dns_push(domain, dry_run, force, purge):
-    import yunohost.dns
+    from yunohost.dns import domain_dns_push
 
-    return yunohost.dns.domain_dns_push(domain, dry_run, force, purge)
+    return domain_dns_push(domain, dry_run, force, purge)

src/yunohost/regenconf.py

@@ -48,7 +48,7 @@ logger = log.getActionLogger("yunohost.regenconf")
 @is_unit_operation([("names", "configuration")])
 def regen_conf(
     operation_logger,
-    names=[],
+    names=None,
     with_diff=False,
     force=False,
     dry_run=False,
@@ -66,6 +66,9 @@ def regen_conf(
 
     """
 
+    if names is None:
+        names = []
+
     result = {}
 
     # Return the list of pending conf

src/yunohost/tools.py

@@ -1130,7 +1130,7 @@ class Migration:
     def description(self):
         return m18n.n("migration_description_%s" % self.id)
 
-    def ldap_migration(run):
+    def ldap_migration(self, run):
         def func(self):
 
             # Backup LDAP before the migration

src/yunohost/user.py

@@ -1263,25 +1263,25 @@ def user_group_remove(groupname, usernames, force=False, sync_perm=True):
 
 
 def user_permission_list(short=False, full=False, apps=[]):
-    import yunohost.permission
+    from yunohost.permission import user_permission_list
 
-    return yunohost.permission.user_permission_list(
+    return user_permission_list(
         short, full, absolute_urls=True, apps=apps
     )
 
 
 def user_permission_update(permission, label=None, show_tile=None, sync_perm=True):
-    import yunohost.permission
+    from yunohost.permission import user_permission_update
 
-    return yunohost.permission.user_permission_update(
+    return user_permission_update(
         permission, label=label, show_tile=show_tile, sync_perm=sync_perm
     )
 
 
 def user_permission_add(permission, names, protected=None, force=False, sync_perm=True):
-    import yunohost.permission
+    from yunohost.permission import user_permission_update
 
-    return yunohost.permission.user_permission_update(
+    return user_permission_update(
         permission, add=names, protected=protected, force=force, sync_perm=sync_perm
     )
 
@@ -1289,23 +1289,23 @@ def user_permission_add(permission, names, protected=None, force=False, sync_per
 def user_permission_remove(
     permission, names, protected=None, force=False, sync_perm=True
 ):
-    import yunohost.permission
+    from yunohost.permission import user_permission_update
 
-    return yunohost.permission.user_permission_update(
+    return user_permission_update(
         permission, remove=names, protected=protected, force=force, sync_perm=sync_perm
     )
 
 
 def user_permission_reset(permission, sync_perm=True):
-    import yunohost.permission
+    from yunohost.permission import user_permission_reset
 
-    return yunohost.permission.user_permission_reset(permission, sync_perm=sync_perm)
+    return user_permission_reset(permission, sync_perm=sync_perm)
 
 
 def user_permission_info(permission):
-    import yunohost.permission
+    from yunohost.permission import user_permission_info
 
-    return yunohost.permission.user_permission_info(permission)
+    return user_permission_info(permission)
 
 
 #

src/yunohost/utils/config.py

@@ -52,7 +52,10 @@ CONFIG_PANEL_VERSION_SUPPORTED = 1.0
 # Those js-like evaluate functions are used to eval safely visible attributes
 # The goal is to evaluate in the same way than js simple-evaluate
 # https://github.com/shepherdwind/simple-evaluate
-def evaluate_simple_ast(node, context={}):
+def evaluate_simple_ast(node, context=None):
+    if context is None:
+        context = {}
+
     operators = {
         ast.Not: op.not_,
         ast.Mult: op.mul,