mirror of https://github.com/knative/pkg.git
82 lines
2.4 KiB
Go
82 lines
2.4 KiB
Go
/*
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Copyright 2020 The Knative Authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// Helper functions for running interactive CLI sessions from Go
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package interactive
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import (
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"io"
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"log"
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"os"
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"os/exec"
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"strings"
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)
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// could be public so extensions of this can test themselves
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var defaultRun func(*exec.Cmd) error
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func init() {
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defaultRun = func(c *exec.Cmd) error { return c.Run() }
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}
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// Command represents running an executable, to make it easy to write interactive "shell scripts" in Go.
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// This routes standard in, out, and error from and to the calling program, intended usually to be a login shell run by a person.
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type Command struct {
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Name string
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Args []string
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// If LogFile is set, anything send to stdout and stderr is tee'd to the file named in LogFile when .Run() is called.
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LogFile string
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run func(*exec.Cmd) error
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}
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// NewCommand creates an Command, breaking out .Name and .Args for you
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func NewCommand(cmdAndArgs ...string) Command {
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if len(cmdAndArgs) < 1 {
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log.Fatal("NewCommand must have a least the command given")
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}
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return Command{cmdAndArgs[0], cmdAndArgs[1:], "", defaultRun}
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}
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// Run executes the command with exec.Command(), sets standard in/out/err, and returns the result of exec.Cmd.Run()
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// Will tee stdout&err to .LogFile if set
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func (c Command) Run() error {
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cmd := exec.Command(c.Name, c.Args...)
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cmd.Stdin = os.Stdin
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if len(c.LogFile) > 0 {
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f, err := os.OpenFile(c.LogFile, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0666)
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if err != nil {
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log.Fatal(err)
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}
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cmd.Stdout = io.MultiWriter(os.Stdout, f)
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cmd.Stderr = io.MultiWriter(os.Stderr, f)
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} else {
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cmd.Stdout = os.Stdout
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cmd.Stderr = os.Stderr
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}
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return c.run(cmd)
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}
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// String conforms to Stringer
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func (c Command) String() string {
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s := c.Name + " " + strings.Join(c.Args, " ")
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return "Command to run: " + s
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}
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// AddArgs appends arguments to the current list of args
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func (c *Command) AddArgs(args ...string) {
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c.Args = append(c.Args, args...)
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}
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