/
shell.go
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/
shell.go
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// Copyright 2018 Istio Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package shell
import (
"fmt"
"os"
"os/exec"
"sort"
"strings"
"istio.io/istio/pkg/log"
)
var scope = log.RegisterScope("shell", "Shell execution scope", 0)
// Execute the given command.
func Execute(format string, args ...interface{}) (string, error) {
s := fmt.Sprintf(format, args...)
// TODO: escape handling
parts := strings.Split(s, " ")
for i := 0; i < len(parts); i++ {
if parts[i] == "" {
parts = append(parts[:i], parts[i+1:]...)
}
}
return executeArgs(nil, parts[0], parts[1:]...)
}
// ExecuteEnv executes the given command, with the specified environment value overrides.
func ExecuteEnv(env map[string]string, format string, args ...interface{}) (string, error) {
s := fmt.Sprintf(format, args...)
// TODO: escape handling
parts := strings.Split(s, " ")
return executeArgs(toEnvironmentList(env), parts[0], parts[1:]...)
}
func executeArgs(env []string, name string, args ...string) (string, error) {
if scope.DebugEnabled() {
cmd := strings.Join(args, " ")
cmd = name + " " + cmd
scope.Debugf("Executing command: %s", cmd)
}
c := exec.Command(name, args...)
c.Env = env
b, err := c.CombinedOutput()
if err != nil || !c.ProcessState.Success() {
scope.Debugf("Command[%s] => (FAILED) %s", name, string(b))
} else {
scope.Debugf("Command[%s] => %s", name, string(b))
}
return string(b), err
}
func toEnvironmentList(m map[string]string) []string {
result := os.Environ() // Start with the current environment values and let the caller override.
for k, v := range m {
result = append(result, fmt.Sprintf("%s=%s", k, v))
}
sort.Strings(result)
return result
}