chore: update Go 1.26.2, document all helpers in README, use prepareArgs consistently

- Bump go.mod from 1.26.1 to 1.26.2
- Add all helper functions to README (GetUnits, GetMaskedUnits,
  GetSocketsForServiceUnit, IsSystemd, IsMasked, IsRunning,
  HasValidUnitSuffix)
- Remove unused fmt import from README example
- Refactor GetSocketsForServiceUnit, GetUnits, GetMaskedUnits to use
  prepareArgs instead of manual arg construction
- Add Go 1.26.2 to CI test matrix

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go-version: ["1.26"]
+        go-version: ["1.26", "1.26.2"]
     steps:
       - uses: actions/checkout@v4
 
@@ -39,7 +39,7 @@ jobs:
         run: sudo go test -race -coverprofile=coverage-root.out -covermode=atomic ./...
 
       - name: Upload coverage to Codecov
-        if: matrix.go-version == '1.26'
+        if: matrix.go-version == '1.26.2'
         uses: codecov/codecov-action@v5
         with:
           files: coverage-user.out,coverage-root.out

README.md

@@ -36,6 +36,13 @@ If your system isn't running (or targeting another system running) `systemctl`,
 - [x] Get current memory in bytes (`MemoryCurrent`) as an int
 - [x] Get the PID of the main process (`MainPID`) as an int
 - [x] Get the restart count of a unit (`NRestarts`) as an int
+- [x] List all loaded units and their states (`list-units`)
+- [x] List masked units (`list-unit-files --state=masked`)
+- [x] Get sockets associated with a service unit (`list-sockets`)
+- [x] Check if a unit is masked
+- [x] Check if a unit is running (sub-state)
+- [x] Check if systemd is the init system (`/proc/1/comm`)
+- [x] Validate unit name suffixes against known systemd unit types
 
 
 ## Useful errors
@@ -55,7 +62,6 @@ package main
 
 import (
     "context"
-    "fmt"
     "log"
     "time"
 

go.mod

@@ -1,3 +1,3 @@
 module github.com/taigrr/systemctl
 
-go 1.26.1
+go 1.26.2

helpers.go

@@ -74,10 +74,7 @@ func GetPID(ctx context.Context, unit string, opts Options) (int, error) {
 
 // GetSocketsForServiceUnit returns the socket units associated with a given service unit.
 func GetSocketsForServiceUnit(ctx context.Context, unit string, opts Options) ([]string, error) {
-	args := []string{"list-sockets", "--all", "--no-legend", "--no-pager"}
-	if opts.UserMode {
-		args = append(args, "--user")
-	}
+	args := prepareArgs("list-sockets", opts, "--all", "--no-legend", "--no-pager")
 	stdout, _, _, err := execute(ctx, args)
 	if err != nil {
 		return []string{}, err
@@ -100,10 +97,7 @@ func GetSocketsForServiceUnit(ctx context.Context, unit string, opts Options) ([
 
 // GetUnits returns a list of all loaded units and their states.
 func GetUnits(ctx context.Context, opts Options) ([]Unit, error) {
-	args := []string{"list-units", "--all", "--no-legend", "--full", "--no-pager"}
-	if opts.UserMode {
-		args = append(args, "--user")
-	}
+	args := prepareArgs("list-units", opts, "--all", "--no-legend", "--full", "--no-pager")
 	stdout, stderr, _, err := execute(ctx, args)
 	if err != nil {
 		return []Unit{}, errors.Join(err, filterErr(stderr))
@@ -129,10 +123,7 @@ func GetUnits(ctx context.Context, opts Options) ([]Unit, error) {
 
 // GetMaskedUnits returns a list of all masked unit names.
 func GetMaskedUnits(ctx context.Context, opts Options) ([]string, error) {
-	args := []string{"list-unit-files", "--state=masked"}
-	if opts.UserMode {
-		args = append(args, "--user")
-	}
+	args := prepareArgs("list-unit-files", opts, "--state=masked")
 	stdout, stderr, _, err := execute(ctx, args)
 	if err != nil {
 		return []string{}, errors.Join(err, filterErr(stderr))