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// SPDX-License-Identifier: GPL-3.0-or-later
//go:build linux
// +build linux
package systemdunits
import (
"context"
"fmt"
"strconv"
"strings"
"github.com/coreos/go-systemd/v22/dbus"
)
const transientProperty = "Transient"
const (
// https://www.freedesktop.org/software/systemd/man/systemd.html
unitStateActive = "active"
unitStateInactive = "inactive"
unitStateActivating = "activating"
unitStateDeactivating = "deactivating"
unitStateFailed = "failed"
)
var unitStates = []string{
unitStateActive,
unitStateActivating,
unitStateFailed,
unitStateInactive,
unitStateDeactivating,
}
func (s *SystemdUnits) collectUnits(mx map[string]int64, conn systemdConnection) error {
var units []dbus.UnitStatus
var err error
if s.systemdVersion >= 230 {
// https://github.com/systemd/systemd/pull/3142
units, err = s.getLoadedUnitsByPatterns(conn)
} else {
units, err = s.getLoadedUnits(conn)
}
if err != nil {
return err
}
seen := make(map[string]bool)
for _, unit := range units {
name, typ, ok := extractUnitNameType(unit.Name)
if !ok {
continue
}
seen[unit.Name] = true
if s.SkipTransient {
if _, ok := s.unitTransient[unit.Name]; !ok {
prop, err := s.getUnitTransientProperty(conn, unit.Name)
if err != nil {
return err
}
prop = strings.Trim(prop, "\"")
s.unitTransient[unit.Name] = prop == "true"
}
if s.unitTransient[unit.Name] {
continue
}
}
if !s.seenUnits[unit.Name] {
s.seenUnits[unit.Name] = true
s.addUnitCharts(name, typ)
}
for _, s := range unitStates {
mx[fmt.Sprintf("unit_%s_%s_state_%s", name, typ, s)] = 0
}
mx[fmt.Sprintf("unit_%s_%s_state_%s", name, typ, unit.ActiveState)] = 1
}
for k := range s.seenUnits {
if !seen[k] {
delete(s.seenUnits, k)
if name, typ, ok := extractUnitNameType(k); ok {
s.removeUnitCharts(name, typ)
}
}
}
for k := range s.unitTransient {
if !seen[k] {
delete(s.unitTransient, k)
}
}
return nil
}
func (s *SystemdUnits) getLoadedUnits(conn systemdConnection) ([]dbus.UnitStatus, error) {
ctx, cancel := context.WithTimeout(context.Background(), s.Timeout.Duration())
defer cancel()
s.Debugf("calling function 'ListUnits'")
units, err := conn.ListUnitsContext(ctx)
if err != nil {
return nil, fmt.Errorf("error on ListUnits: %v", err)
}
for i := range units {
units[i].Name = cleanUnitName(units[i].Name)
}
loaded := units[:0]
for _, unit := range units {
if unit.LoadState == "loaded" && s.unitSr.MatchString(unit.Name) {
loaded = append(loaded, unit)
}
}
s.Debugf("got total/loaded %d/%d units", len(units), len(loaded))
return loaded, nil
}
func (s *SystemdUnits) getLoadedUnitsByPatterns(conn systemdConnection) ([]dbus.UnitStatus, error) {
ctx, cancel := context.WithTimeout(context.Background(), s.Timeout.Duration())
defer cancel()
s.Debugf("calling function 'ListUnitsByPatterns'")
units, err := conn.ListUnitsByPatternsContext(ctx, unitStates, s.Include)
if err != nil {
return nil, fmt.Errorf("error on ListUnitsByPatterns: %v", err)
}
for i := range units {
units[i].Name = cleanUnitName(units[i].Name)
}
loaded := units[:0]
for _, unit := range units {
if unit.LoadState == "loaded" {
loaded = append(loaded, unit)
}
}
s.Debugf("got total/loaded %d/%d units", len(units), len(loaded))
return loaded, nil
}
func (s *SystemdUnits) getUnitTransientProperty(conn systemdConnection, unit string) (string, error) {
ctx, cancel := context.WithTimeout(context.Background(), s.Timeout.Duration())
defer cancel()
s.Debugf("calling function 'GetUnitProperty' for unit '%s'", unit)
prop, err := conn.GetUnitPropertyContext(ctx, unit, transientProperty)
if err != nil {
return "", fmt.Errorf("error on GetUnitProperty: %v", err)
}
return prop.Value.String(), nil
}
func extractUnitNameType(name string) (string, string, bool) {
idx := strings.LastIndexByte(name, '.')
if idx <= 0 {
return "", "", false
}
return name[:idx], name[idx+1:], true
}
func cleanUnitName(name string) string {
// dev-disk-by\x2duuid-DE44\x2dCEE0.device => dev-disk-by-uuid-DE44-CEE0.device
if strings.IndexByte(name, '\\') == -1 {
return name
}
v, err := strconv.Unquote("\"" + name + "\"")
if err != nil {
return name
}
return v
}
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