64 lines
2.1 KiB
Go
64 lines
2.1 KiB
Go
// Mgmt
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// Copyright (C) 2013-2020+ James Shubin and the project contributors
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// Written by James Shubin <james@shubin.ca> and the project contributors
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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// This program works exactly like the `tee` program, if it was invoked with an
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// implicit --ignore-interrupts argument, and if it also had an --ignore-quit
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// argument. These are needed so that it doesn't exit prematurely when called as
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// a receiving member of a shell pipeline. This is needed so that a ^C or ^\ can
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// cause the sending process to shutdown and relay its data into the tee. Sadly,
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// the venerable `tee` program can't currently ignore the QUIT signal.
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package main
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import (
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"fmt"
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"io"
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"os"
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"os/signal"
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"syscall"
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)
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func main() {
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// TODO: Add better argv parsing and implement explicit flags for
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// --ignore-interrupts argument, and --ignore-quit so that it's cleaner.
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if len(os.Args) != 2 {
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fmt.Fprintf(os.Stderr, "usage: <STDIN> | %s <FILE>\n", os.Args[0])
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os.Exit(1)
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return
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}
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filename := os.Args[1]
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// Make sure we ignore ^C and ^\ when run in a shell pipe.
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signal.Ignore(os.Interrupt, syscall.SIGQUIT) // TODO: add os.Kill ?
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f, err := os.Create(filename)
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if err != nil {
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fmt.Fprintf(os.Stderr, "can't write to: %s\n", filename)
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os.Exit(1)
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return
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}
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defer f.Close()
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writer := io.MultiWriter(os.Stdout, f) // tee !
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_, err = io.Copy(writer, os.Stdin)
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if err != nil {
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fmt.Fprintf(os.Stderr, "copy error: %+v\n", err)
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os.Exit(1)
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return
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}
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}
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