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cmd: dup2(logfile, stderr) if logfile set

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This commit is contained in:
Christian Schwarz 2017-05-12 23:38:46 +02:00
parent 6f84bf665d
commit ee8b0d3781
1 changed files with 9 additions and 1 deletions
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10
cmd/main.go
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@ -7,6 +7,7 @@ import (
"github.com/zrepl/zrepl/rpc" "github.com/zrepl/zrepl/rpc"
"github.com/zrepl/zrepl/sshbytestream" "github.com/zrepl/zrepl/sshbytestream"
"github.com/zrepl/zrepl/zfs" "github.com/zrepl/zrepl/zfs"
"golang.org/x/sys/unix"
"io" "io"
"log" "log"
"os" "os"
@ -88,10 +89,17 @@ func doSink(c *cli.Context) (err error) {
var logOut io.Writer var logOut io.Writer
if c.IsSet("logfile") { if c.IsSet("logfile") {
logOut, err = os.OpenFile(c.String("logfile"), os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0600) var logFile *os.File
logFile, err = os.OpenFile(c.String("logfile"), os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0600)
if err != nil { if err != nil {
return return
} }
if err = unix.Dup2(int(logFile.Fd()), int(os.Stderr.Fd())); err != nil {
logFile.WriteString(fmt.Sprintf("error duping logfile to stderr: %s\n", err))
return
}
logOut = logFile
} else { } else {
logOut = os.Stderr logOut = os.Stderr
} }