100 lines
2.8 KiB
Go
100 lines
2.8 KiB
Go
// Copyright (c) 2026 Probo Inc <hello@probo.com>.
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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// PERFORMANCE OF THIS SOFTWARE.
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package service
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import (
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"errors"
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"fmt"
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"os"
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"os/exec"
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"strings"
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"text/template"
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)
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const (
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systemdUnitPath = "/etc/systemd/system/probo-agent.service"
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)
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const systemdUnitTmpl = `[Unit]
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Description=Probo device posture agent
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After=network-online.target
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Wants=network-online.target
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[Service]
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Type=simple
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ExecStart={{.ExePath}} run --dir {{.Dir}}
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Restart=always
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RestartSec=10
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# 75 is the exit code emitted after a successful self-update.
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# Treat it as a normal exit so the unit restarts without entering
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# the "failed" state.
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SuccessExitStatus=75
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User=root
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NoNewPrivileges=true
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PrivateTmp=true
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ProtectSystem=full
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[Install]
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WantedBy=multi-user.target
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`
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func Install(cfg Config) error {
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if cfg.ExePath == "" {
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return errors.New("executable path is required")
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}
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if cfg.Dir == "" {
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return errors.New("state directory is required")
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}
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tmpl, err := template.New("unit").Parse(systemdUnitTmpl)
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if err != nil {
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return fmt.Errorf("cannot parse unit template: %w", err)
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}
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f, err := os.OpenFile(systemdUnitPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0o644)
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if err != nil {
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return fmt.Errorf("cannot write systemd unit (need root?): %w", err)
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}
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defer func() { _ = f.Close() }()
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if err := tmpl.Execute(f, cfg); err != nil {
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return fmt.Errorf("cannot render systemd unit: %w", err)
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}
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if out, err := exec.Command("systemctl", "daemon-reload").CombinedOutput(); err != nil {
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return fmt.Errorf("cannot run systemctl daemon-reload: %w: %s", err, strings.TrimSpace(string(out)))
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}
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if out, err := exec.Command("systemctl", "enable", "--now", "probo-agent.service").CombinedOutput(); err != nil {
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return fmt.Errorf("cannot run systemctl enable --now: %w: %s", err, strings.TrimSpace(string(out)))
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}
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return nil
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}
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func Uninstall(cfg Config) error {
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_ = exec.Command("systemctl", "disable", "--now", "probo-agent.service").Run()
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if err := os.Remove(systemdUnitPath); err != nil && !errors.Is(err, os.ErrNotExist) {
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return fmt.Errorf("cannot remove systemd unit: %w", err)
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}
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_ = exec.Command("systemctl", "daemon-reload").Run()
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return nil
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}
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