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|
package main
import (
"errors"
"fmt"
"io"
"io/fs"
"os"
"os/exec"
"path"
)
const (
systemdCheckPath = "/run/systemd/system"
)
// https://www.freedesktop.org/software/systemd/man/sd_booted.html
func sdBooted() bool {
_, err := os.Stat(systemdCheckPath)
if err != nil {
if verbose {
if errors.Is(err, fs.ErrNotExist) {
fmt.Println("System not booted through systemd")
} else {
fmt.Println("Error accessing", systemdCheckPath+":", err.Error())
}
}
return false
}
return true
}
// Try various ways to discover the current user's PulseAudio authentication cookie.
func discoverPulseCookie() string {
if p, ok := os.LookupEnv(pulseCookie); ok {
return p
}
if p, ok := os.LookupEnv(home); ok {
p = path.Join(p, ".pulse-cookie")
if s, err := os.Stat(p); err != nil {
if !errors.Is(err, fs.ErrNotExist) {
fatal("Error accessing PulseAudio cookie:", err)
// unreachable
return p
}
} else if !s.IsDir() {
return p
}
}
if p, ok := os.LookupEnv(xdgConfigHome); ok {
p = path.Join(p, "pulse", "cookie")
if s, err := os.Stat(p); err != nil {
if !errors.Is(err, fs.ErrNotExist) {
fatal("Error accessing PulseAudio cookie:", err)
// unreachable
return p
}
} else if !s.IsDir() {
return p
}
}
fatal(fmt.Sprintf("Cannot locate PulseAudio cookie (tried $%s, $%s/pulse/cookie, $%s/.pulse-cookie)",
pulseCookie, xdgConfigHome, home))
return ""
}
func which(file string) (string, bool) {
p, err := exec.LookPath(file)
return p, err == nil
}
func copyFile(dst, src string) error {
srcD, err := os.Open(src)
if err != nil {
return err
}
defer func() {
if srcD.Close() != nil {
// unreachable
panic("src file closed prematurely")
}
}()
dstD, err := os.OpenFile(dst, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return err
}
defer func() {
if dstD.Close() != nil {
// unreachable
panic("dst file closed prematurely")
}
}()
_, err = io.Copy(dstD, srcD)
return err
}
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