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helpers.go
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helpers.go
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package systemctl
import (
"context"
"errors"
"strconv"
"strings"
"time"
"github.com/taigrr/systemctl/properties"
)
const dateFormat = "Mon 2006-01-02 15:04:05 MST"
// Get start time of a service (`systemctl show [unit] --property ExecMainStartTimestamp`) as a `Time` type
func GetStartTime(ctx context.Context, unit string, opts Options) (time.Time, error) {
value, err := Show(ctx, unit, properties.ExecMainStartTimestamp, opts)
if err != nil {
return time.Time{}, err
}
// ExecMainStartTimestamp returns an empty string if the unit is not running
if value == "" {
return time.Time{}, ErrUnitNotActive
}
return time.Parse(dateFormat, value)
}
// Get the number of times a process restarted (`systemctl show [unit] --property NRestarts`) as an int
func GetNumRestarts(ctx context.Context, unit string, opts Options) (int, error) {
value, err := Show(ctx, unit, properties.NRestarts, opts)
if err != nil {
return -1, err
}
return strconv.Atoi(value)
}
// Get current memory in bytes (`systemctl show [unit] --property MemoryCurrent`) an an int
func GetMemoryUsage(ctx context.Context, unit string, opts Options) (int, error) {
value, err := Show(ctx, unit, properties.MemoryCurrent, opts)
if err != nil {
return -1, err
}
if value == "[not set]" {
return -1, ErrValueNotSet
}
return strconv.Atoi(value)
}
// Get the PID of the main process (`systemctl show [unit] --property MainPID`) as an int
func GetPID(ctx context.Context, unit string, opts Options) (int, error) {
value, err := Show(ctx, unit, properties.MainPID, opts)
if err != nil {
return -1, err
}
return strconv.Atoi(value)
}
func GetMaskedUnits(ctx context.Context, opts Options) ([]string, error) {
args := []string{"list-unit-files", "--state=masked"}
if opts.UserMode {
args = append(args, "--user")
}
stdout, stderr, _, err := execute(ctx, args)
if err != nil {
return []string{}, errors.Join(err, filterErr(stderr))
}
lines := strings.Split(stdout, "\n")
units := []string{}
for _, line := range lines {
if !strings.Contains(line, "masked") {
continue
}
entry := strings.Split(line, " ")
if len(entry) < 3 {
continue
}
if entry[1] == "masked" {
unit := entry[0]
uName := strings.Split(unit, ".")
unit = uName[0]
units = append(units, unit)
}
}
return units, nil
}
// check if a service is masked
func IsMasked(ctx context.Context, unit string, opts Options) (bool, error) {
units, err := GetMaskedUnits(ctx, opts)
if err != nil {
return false, err
}
for _, u := range units {
if u == unit {
return true, nil
}
}
return false, nil
}
// check if a service is running
// https://unix.stackexchange.com/a/396633
func IsRunning(ctx context.Context, unit string, opts Options) (bool, error) {
status, err := Show(ctx, unit, properties.SubState, opts)
return status == "running", err
}