1d8dbac81aWindows DnsServiceRegister now registers the Bonjour service-type form and the RFC subtype name so a Mac browse of _ipp._tcp,_universal can see the printer. document-format-supported matches the TXT pdl list, including JPEG. Job ids persist in next-job and job-N directories. The service log is written and flushed even when stderr fails. The tray is started by Task Scheduler or Explorer so setup is not its parent. Co-authored-by: George Lambert <marchon@gmail.com>
66 lines
1.6 KiB
Go
66 lines
1.6 KiB
Go
package netprint
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import (
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"io"
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"log"
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"os"
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"path/filepath"
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)
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// serviceLogWriter appends each line to the log file and flushes it.
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// A Windows service has no console, so os.Stderr.Write fails. io.MultiWriter
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// stops at that first error and never reaches the file, which left
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// netprint.log at 0 bytes. The file is written first; stderr is best-effort.
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type serviceLogWriter struct {
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file *os.File
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extra io.Writer
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}
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func (w *serviceLogWriter) Write(p []byte) (int, error) {
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if w == nil || w.file == nil {
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return 0, os.ErrInvalid
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}
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n, err := w.file.Write(p)
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if err != nil {
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return n, err
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}
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if n != len(p) {
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return n, io.ErrShortWrite
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}
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_ = w.file.Sync()
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if w.extra != nil {
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_, _ = w.extra.Write(p)
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}
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return n, nil
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}
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// setupServiceLog appends the service log under %ProgramData%\Verae\logs on Windows.
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// VERAE_LOG_DIR overrides the directory (used by tests).
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func setupServiceLog() {
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dir := serviceLogDir()
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if err := os.MkdirAll(dir, 0o755); err != nil {
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log.Printf("netprint: log directory: %v", err)
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return
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}
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_ = osChmodUsers(dir)
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f, err := os.OpenFile(filepath.Join(dir, "netprint.log"), os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0o644)
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if err != nil {
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log.Printf("netprint: log file: %v", err)
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return
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}
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log.SetFlags(log.Ldate | log.Ltime)
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log.SetOutput(&serviceLogWriter{file: f, extra: os.Stderr})
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log.Printf("netprint: log file %s", f.Name())
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}
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func serviceLogDir() string {
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if d := os.Getenv("VERAE_LOG_DIR"); d != "" {
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return d
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}
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return defaultServiceLogDir()
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}
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func osChmodUsers(dir string) error {
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// Users (S-1-5-32-545) can read the service log. Ignore failure when not elevated.
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return execGrantUsers(dir)
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}
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