65 lines
1.7 KiB
Go
65 lines
1.7 KiB
Go
/*
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Copyright 2018 The OpenEBS 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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//go:generate mockgen -package exec -source=exec.go -destination exec_mock.go
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package exec
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import (
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"bytes"
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"fmt"
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osexec "os/exec"
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"strings"
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)
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// Executor acts as a contract for various execution based logic
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type Executor interface {
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Output(args []string) (output string, err error)
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}
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// ShellExec is a shell based struct that implements Executor interface
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type ShellExec struct {
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binary string
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}
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// NewShellExec returns a new instance of shellExec
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// based on the provided binary name
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func NewShellExec(binary string) *ShellExec {
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return &ShellExec{
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binary: binary,
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}
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}
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// Output executes the shell command and returns the output or error
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func (e *ShellExec) Output(args []string) (output string, err error) {
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var out bytes.Buffer
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var stderr bytes.Buffer
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cmd := osexec.Command(e.binary, args...)
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cmd.Stdout = &out
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cmd.Stderr = &stderr
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err = cmd.Run()
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if err != nil {
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err = fmt.Errorf("failed to run cmd '%s': %s: %s", cmd.Args, fmt.Sprint(err), stderr.String())
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return
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}
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// This removes the beginning & trailing single quotes from the output
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// It has been observed that kubectl execution results in such single quotes
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output = strings.Trim(out.String(), "'")
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return
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}
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