mirror of
https://github.com/k3s-io/k3s.git
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57 lines
1.7 KiB
Go
57 lines
1.7 KiB
Go
/*
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Copyright The ocicrypt 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 utils
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import (
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"bytes"
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"io"
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"os/exec"
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"github.com/pkg/errors"
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)
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// FillBuffer fills the given buffer with as many bytes from the reader as possible. It returns
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// EOF if an EOF was encountered or any other error.
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func FillBuffer(reader io.Reader, buffer []byte) (int, error) {
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n, err := io.ReadFull(reader, buffer)
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if err == io.ErrUnexpectedEOF {
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return n, io.EOF
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}
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return n, err
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}
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// first argument is the command, like cat or echo,
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// the second is the list of args to pass to it
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type CommandExecuter interface {
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Exec(string, []string, []byte) ([]byte, error)
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}
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type Runner struct{}
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// ExecuteCommand is used to execute a linux command line command and return the output of the command with an error if it exists.
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func (r Runner) Exec(cmdName string, args []string, input []byte) ([]byte, error) {
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var out bytes.Buffer
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stdInputBuffer := bytes.NewBuffer(input)
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cmd := exec.Command(cmdName, args...)
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cmd.Stdin = stdInputBuffer
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cmd.Stdout = &out
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err := cmd.Run()
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if err != nil {
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return nil, errors.Wrapf(err, "Error while running command: %s", cmdName)
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}
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return out.Bytes(), nil
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}
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