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75 lines
1.9 KiB
Go
75 lines
1.9 KiB
Go
/*
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Copyright 2017 The Kubernetes 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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package plugins
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import (
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"io"
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"os"
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"os/exec"
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"strings"
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"github.com/golang/glog"
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)
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// PluginRunner is capable of running a plugin in a given running context.
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type PluginRunner interface {
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Run(plugin *Plugin, ctx RunningContext) error
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}
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// RunningContext holds the context in which a given plugin is running - the
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// in, out, and err streams, arguments and environment passed to it, and the
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// working directory.
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type RunningContext struct {
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In io.Reader
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Out io.Writer
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ErrOut io.Writer
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Args []string
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EnvProvider EnvProvider
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WorkingDir string
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}
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// ExecPluginRunner is a PluginRunner that uses Go's os/exec to run plugins.
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type ExecPluginRunner struct{}
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// Run takes a given plugin and runs it in a given context using os/exec, returning
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// any error found while running.
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func (r *ExecPluginRunner) Run(plugin *Plugin, ctx RunningContext) error {
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command := strings.Split(os.ExpandEnv(plugin.Command), " ")
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base := command[0]
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args := []string{}
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if len(command) > 1 {
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args = command[1:]
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}
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args = append(args, ctx.Args...)
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cmd := exec.Command(base, args...)
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cmd.Stdin = ctx.In
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cmd.Stdout = ctx.Out
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cmd.Stderr = ctx.ErrOut
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env, err := ctx.EnvProvider.Env()
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if err != nil {
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return err
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}
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cmd.Env = env.Slice()
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cmd.Dir = ctx.WorkingDir
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glog.V(9).Infof("Running plugin %q as base command %q with args %v", plugin.Name, base, args)
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return cmd.Run()
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}
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