d30ff6cfae
Instead of constantly making these updates, let's just remove the year since things are stored in git anyways, and this is not an actual modern legal risk anymore.
76 lines
2.7 KiB
Go
76 lines
2.7 KiB
Go
// Mgmt
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// Copyright (C) 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 <https://www.gnu.org/licenses/>.
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//
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// Additional permission under GNU GPL version 3 section 7
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//
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// If you modify this program, or any covered work, by linking or combining it
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// with embedded mcl code and modules (and that the embedded mcl code and
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// modules which link with this program, contain a copy of their source code in
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// the authoritative form) containing parts covered by the terms of any other
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// license, the licensors of this program grant you additional permission to
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// convey the resulting work. Furthermore, the licensors of this program grant
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// the original author, James Shubin, additional permission to update this
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// additional permission if he deems it necessary to achieve the goals of this
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// additional permission.
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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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