fix: what bandit and the remaining lint rules found

- Long shell command lines are split into adjacent string literals.
- get_os_users: a first loop over /etc/group filled a map nobody read;
  it is gone, the output is unchanged.
- The five except Exception: pass now log at debug level (B110), so a
  swallowed failure leaves a trace.
- nosec for the staging path on the device (B108) and the sudo hint
  message (B105); both are false positives.
- tests: raise ... from exc, unused loop variable.

napalm_linux/linux.py

@@ -171,15 +171,16 @@ _NO_STDIN = "exec </dev/null; "
 
 #: Where ``_install_file_as_root`` stages content: a fresh file from ``mktemp``
 #: under ``umask 077``, never a fixed name another user could create first.
-_STAGE_TEMPLATE = "/tmp/netork-stage.XXXXXX"
+#: The path is on the device, not a local temp file.
+_STAGE_TEMPLATE = "/tmp/netork-stage.XXXXXX"  # nosec B108
 _STAGE_PREFIX = _STAGE_TEMPLATE[: -len("XXXXXX")]
 _STAGE = (
     f"umask 077 && t=$(mktemp {_STAGE_TEMPLATE}) && "
     '{ cat > "$t" && printf %s "$t" || { s=$?; rm -f -- "$t"; exit $s; }; }'
 )
 
-#: What to do when sudo wants a password netOrk does not have.
+#: What to do when sudo wants a password netOrk does not have (a message, not a password).
-_SUDO_PASSWORD_HINT = (
+_SUDO_PASSWORD_HINT = (  # nosec B105
     "sudo requires a password on this host and no sudo password was given: pass one, "
     "or allow this user passwordless sudo (NOPASSWD)."
 )
@@ -274,7 +275,10 @@ def _arm_vendor_from_model(model: str) -> str:
 #: Where net-snmp reads its configuration, and how each package manager installs it.
 _SNMPD_CONF = "/etc/snmp/snmpd.conf"
 _SNMP_INSTALL = {
-    "apt": "apt-get update -y >/dev/null 2>&1; DEBIAN_FRONTEND=noninteractive apt-get install -y snmpd snmp 2>&1",
+    "apt": (
+        "apt-get update -y >/dev/null 2>&1; "
+        "DEBIAN_FRONTEND=noninteractive apt-get install -y snmpd snmp 2>&1"
+    ),
     "dnf": "dnf install -y net-snmp net-snmp-utils 2>&1",
     "yum": "yum install -y net-snmp net-snmp-utils 2>&1",
     "apk": "apk add --no-cache net-snmp net-snmp-tools 2>&1",
@@ -425,7 +429,7 @@ class LinuxDriver(
                 "stty cols 10000 2>/dev/null || true", expect_string=r"[#$>]\s*$"
             )
         except Exception:
-            pass
+            logger.debug("%s: ignored", self.hostname, exc_info=True)
 
         self._pkg_manager = self._forced_pkg_manager or self._detect_pkg_manager()
         logger.debug("Connected to %s, pkg_manager=%s", self.hostname, self._pkg_manager)
@@ -436,7 +440,7 @@ class LinuxDriver(
             try:
                 self._device.disconnect()
             except Exception:
-                pass
+                logger.debug("%s: ignored", self.hostname, exc_info=True)
             self._device = None
         self._pkg_manager = None
 
@@ -668,8 +672,10 @@ class LinuxDriver(
             "u=$(cat /sys/class/dmi/id/product_uuid 2>/dev/null); "
             "d=$(systemd-detect-virt 2>/dev/null); d=${d:-none}; "
             "dt=$(tr -d '\\0' </sys/firmware/devicetree/base/model 2>/dev/null); "
-            "cs=$(grep '^Serial' /proc/cpuinfo 2>/dev/null | head -1 | cut -d: -f2 | xargs 2>/dev/null); "
+            "cs=$(grep '^Serial' /proc/cpuinfo 2>/dev/null | head -1 | cut -d: -f2 "
-            "cm=$(grep '^Model' /proc/cpuinfo 2>/dev/null | head -1 | cut -d: -f2 | xargs 2>/dev/null); "
+            "| xargs 2>/dev/null); "
+            "cm=$(grep '^Model' /proc/cpuinfo 2>/dev/null | head -1 | cut -d: -f2 "
+            "| xargs 2>/dev/null); "
             # DMIBEGIN sentinel: _send() strips leading blank lines (ARM has no DMI
             # files, so fields 0-4 are empty). The sentinel anchors the output so
             # splitlines()[start+N] always maps to the correct field index.
@@ -1075,7 +1081,7 @@ class LinuxDriver(
                                 _make_entry(mapped_proto, nexthop, iface, metric, prefix)
                             )
             except Exception:
-                pass
+                logger.debug("%s: ignored", self.hostname, exc_info=True)
 
         return routes
 
@@ -1324,7 +1330,8 @@ class LinuxDriver(
 
     def _get_packages_rpm(self) -> list[PackageDict]:
         out = self._send(
-            "rpm -qa --queryformat '%{NAME}\\t%{VERSION}-%{RELEASE}\\t%{SIZE}\\t%{SUMMARY}\\n' 2>/dev/null"
+            "rpm -qa --queryformat "
+            "'%{NAME}\\t%{VERSION}-%{RELEASE}\\t%{SIZE}\\t%{SUMMARY}\\n' 2>/dev/null"
         )
         packages: list[PackageDict] = []
         for line in out.splitlines():
@@ -1863,19 +1870,7 @@ class LinuxDriver(
         passwd_out = self._send("getent passwd 2>/dev/null || cat /etc/passwd")
         groups_out = self._send("getent group 2>/dev/null || cat /etc/group")
 
-        # Build uid→[group] map from /etc/group
+        # username → supplementary groups, joined with passwd below
-        uid_to_groups: dict[int, list[str]] = {}
-        for line in groups_out.splitlines():
-            parts = line.split(":")
-            if len(parts) < 4:
-                continue
-            gname = parts[0]
-            members = [m.strip() for m in parts[3].split(",") if m.strip()]
-            for member in members:
-                # We'll convert username→uid below; collect by username first
-                uid_to_groups.setdefault(-1, [])  # placeholder
-
-        # Simpler: collect username→groups, then join with passwd
         username_to_groups: dict[str, list[str]] = {}
         for line in groups_out.splitlines():
             parts = line.split(":")
@@ -1994,9 +1989,7 @@ class LinuxDriver(
         return jobs
 
     @staticmethod
-    def _parse_cron_line(
+    def _parse_cron_line(line: str, source_user: str, has_user_field: bool) -> CronJobDict | None:
-        line: str, source_user: str, has_user_field: bool
-    ) -> CronJobDict | None:
         """Parse a single crontab line; returns ``None`` for comments/blanks."""
         stripped = line.strip()
         # Remove trailing comment
@@ -2064,7 +2057,7 @@ class LinuxDriver(
                         community = parts[3]
                         break
             except Exception:
-                pass
+                logger.debug("%s: ignored", self.hostname, exc_info=True)
 
             # Detect port override
             try:
@@ -2076,7 +2069,7 @@ class LinuxDriver(
                     if m:
                         port = int(m.group(1))
             except Exception:
-                pass
+                logger.debug("%s: ignored", self.hostname, exc_info=True)
 
             return SNMPConfigDict(running=True, community=community, port=port, version="2c")
         except Exception as exc:

tests/test_fix_templates.py

@@ -188,7 +188,7 @@ def test_every_annotation_resolves():
     import inspect
     import typing
 
-    for name, member in inspect.getmembers(LinuxDriver, inspect.isfunction):
+    for _name, member in inspect.getmembers(LinuxDriver, inspect.isfunction):
         if member.__module__ == "napalm_linux.linux":
             typing.get_type_hints(member)
 

tests/test_ssh_host_key.py

@@ -78,7 +78,7 @@ def test_a_changed_key_is_refused():
         try:
             raise paramiko.BadHostKeyException("10.0.0.8", SERVER_KEY, OTHER_KEY)
         except paramiko.SSHException as exc:  # what netmiko does with it
-            raise NetmikoTimeoutException(f"A paramiko SSHException occurred: {exc}")
+            raise NetmikoTimeoutException(f"A paramiko SSHException occurred: {exc}") from exc
 
     driver = _driver(seen, SshHostKey.of(OTHER_KEY))
     with patch("napalm_linux.linux.ConnectHandler", side_effect=refuse):